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EK-DEFBA-IN-A01

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Document:	DECbridge 900MX Installation
Order Number:	EK-DEFBA-IN
Revision:	A01
Pages:	60
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DECbridge 900MX
Installation
Part Number: EK–DEFBA-IN. A01

May 1994

This manual describes how to install and verify the operation of the
DECbridge 900MX module.

Revision/Update Information:

This is a new manual.

Copyright
May 1994
The information in this document is subject to change without notice and should not be construed as a
commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility
for any errors that may appear in this document.
Copyright  1994 by Digital Equipment Corporation.
All rights reserved. Printed in U.S.A.
The postage-paid Reader’s Comments form at the back of this document requests your evaluation of this
document to assist us in preparing future documentation.
The following are trademarks of Digital Equipment Corporation: DEC, DECbridge, DECconnect, DEChub,
DEChub ONE, DECndu, DECndu Plus, DECnet, Digital, MultiSwitch, and the DIGITAL logo.
AppleTalk is a registered trademark of Apple Computer, Inc.
Novell is a registered trademark of Novell, Inc.
FCC NOTICE — Class A Computing Device:
This equipment generates, uses, and may emit radio frequency energy. The equipment has been type
tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15
of FCC Rules, which are designed to provide reasonable protection against such radio frequency
interference when operated in a commercial environment. Operation of this equipment in a residential area
may cause interference; in which case, measures taken to correct the interference are at the user’s
expense.
VCCI NOTICE — Class 1 Computing Device:
This equipment is in the 1st Class category (information equipment to be used in commercial and/or
industrial areas) and conforms to the standards set by the Voluntary Control Council for Interference by
Data Processing Equipment and Electronic Office Machines aimed at preventing radio interference in
commercial and/or industrial areas. Consequently, when used in a residential area or in an adjacent area
thereto, radio interference may be caused to radios and TV receivers. Read the instructions for correct
handling.
CE NOTICE – Class A Computing Device:
Warning!
This is a Class A product. In a domestic environment this product may cause radio interference, in which
case the user may be required to take adequate measures.
Achtung!
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses
Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer für entsprechende
Gegenmaßnahmen verantwortlich ist.
Attention!
Ceci est un produit de Classe A. Dans un environment domestique, ce produit risque de créer des
interférences radioélectriques, il appartiendra alors à l’utilisateur de prendre les mesures spécifiques
appropriées.

Contents

Safety
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Removing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Configuring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setup Port Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup Port Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessing the Setup Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Redirect Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbridge 900MX Installation Menu (DEChub ONE Options) . . . . . . .
DECbridge 900MX Installation Menu (DEChub 900 Options) . . . . . . . .
Description of Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11
11
11
14
15
16
17

LED Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Problem Solving Using the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Normal Powerup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10BaseT (8-pin MJ) Port Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optical Bypass Relay (6-pin MJ) Connector . . . . . . . . . . . . . . . . . . . . . . .
Internal and External Crossover Configurations . . . . . . . . . . . . . . . . . . . .
H8571-J Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H8575-A Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BNE4C/D AUI (15-pin D-Sub) Port Connector . . . . . . . . . . . . . . . . . . . .

40
40
41
42
42
43

iii

Contents (Cont.)
Product Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Associated Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Tables
1 Module LED States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 FDDI PHY LED States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Problem Solving Using the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 DECbridge 900MX Operating Specifications . . . . . . . . . . . . . . . . . . .
5 Acoustical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37
37
38
44
45

Safety

Any warning or caution that appears in this manual is defined as follows:
WARNING

Contains information to prevent personal injury.

CAUTION

Contains information to prevent damage to equipment.

VORSICHT

Enthält Informationen, die beachtet werden müssen,
um den Benutzer vor Schaden zu bewahren.

ACHTUNG

Enthält Informationen, die beachtet werden müssen,
um die Geräte vor Schaden zu bewahren.

DANGER

Signale les informations destinées à prévenir les accidents corporels.

ATTENTION

Signale les informations destinées à prévenir la détérioration du matériel.

AVISO

Contiene información para evitar daños personales.

PRECAUCION

Contiene información para evitar daños al equipo.

Safety

(Cont.)

The cautions that must be observed for the hardware described in this manual are
listed below in English, German, French, and Spanish. The pages on which these
safety messages appear are also listed.

WARNING

To prevent personal injury or equipment damage, do not insert telecommunications cabling into the Optical Bypass
Relay connector. [Page 4.]

VORSICHT

Um Personen oder Geräteschäden zu vermeiden, dürfen
Sie das Telefonkabel Auf Keinen Fall am Anschluß des
optischen Bypass–Relais anschließen.

DANGER

Pour éviter tout risque d’accident corporel ou de dommage matériel, Ne Branchez Pas de câble de télécommunication sur le connecteur de relais sélectif optique.

AVISO

Para evitar daños personales o al equipo, No se debe
introducir cableado de telecomunicaciones en el conector óptico de relés de derivación.

WARNING

VORSICHT

Some fiber optic equipment can emit laser or infrared light
that can injure your eyes. Never look into an optical fiber or
connector port. Always assume the cable is connected to a
light source. [Pages 8 and 10.]
Bestimmte Lichtleitergeräte können für die Augen
gefährliches Laser– oder Infrarotlicht abstrahlen. Vermeiden Sie es daher unter allen Umständen, direkt in ein
Lichtleiterkabel oder einen Lichtleiteranschluß zu
schauen. Gehen Sie immer davon aus, daß Lichtleiterkabel mit einer Lichtquelle verbunden sind.

DANGER

Certains équipements à fibre optique peuvent émettre un
rayonnement laser ou infra–rouge pouvant provoquer
des troubles oculaires. Ne regardez jamais à l’intérieur
d’une fibre optique ou d’un port de connecteur. Considérez que le câble est connecté en permanence à une
source lumineuse.

AVISO

Ciertos equipos de fibras ópticas pueden emitir luz lasérica o infrarroja con riesgos de lesiones en los ojos. No se
debe nunca mirar en una fibra óptica o una puerta de
conexión. Siempre hay que suponer que el cable está
conectado a una fuente luminosa.

Safety

CAUTION

(Cont.)

This action deletes all configured settings and replaces
them with factory default values. All configuration settings
will be lost. [Page 17.]

ACHTUNG

Bei diesem Vorgang werden alle Konfigurationseinstellungen gelöscht und die Werkseinstellungen wieder eingesetzt. Alle Konfigurationsdaten gehen verloren.

ATTENTION

Cette action supprime tous les paramètres de configuration et les remplace par des valeurs prédéfinies. Tous
les paramètres de configuration seront perdus.

PRECAUCION

Esta intervención borrará todos los parámetros de configuración y los sustituirá por valores por defecto definidos
de fábrica. Se perderán todos los parámetros de configuración.

CAUTION

If power is interrupted during a downline load,the firmware
image can become corrupted. Do not turn off power to the
unit or perform any action that can cause the unit to lose
power during a downline upgrade. [Pages 26 and 31.]

ACHTUNG

Wenn die Stromversorgung während des Fernladens unterbrochen wird, besteht die Gefahr, daß die Firmwaredaten zerstört werden. Während der Durchführung der
Ferninstallation der Firmware müssen Sie daher unter allen Umständen dafür Sorge tragen, daß die Stromversorgung des Geräts nicht unterbrochen werden kann.

ATTENTION

Une coupure de courant au cours de la procédure de
téléchargement peut entraîner la détérioration de l’image
du microprogramme. Ne mettez pas l’unité hors tension
et n’exécutez une action pouvant provoquer une coupure
de courant au cours de cette procédure.

PRECAUCION

Si ocurre una interrupción del suministro durante la carga
desde el sistema central, puede corrompirse la imagen
del firmware. No se debe apagar el dispositivo, ni tomar
ninguna medida que pueda producir un corte de la alimentación durante una actualización por telecarga.

vii

Introduction
The DECbridge 900MX (also referred to in this manual as the module) provides the
interconnection between six 10 Mb/s Ethernet LANs and a high-speed 100 Mb/s
Fiber Distributed Data Interface (FDDI) network backbone.
In this manual, the term Ethernet is Digital’s term for its product compatibility with the
ISO 8802-3/ANSI/IEEE 802.3 standards and the Ethernet standards for CSMA/CD
local area networks.
As a self-learning IEEE 802.1d Media Access Control (MAC) bridge, the module
performs standard functions such as filtering and forwarding. In addition, the module
performs high-speed, transparent translation of network data packets between the
FDDI and Ethernet networks.
The DECbridge 900MX module is protocol-independent. As such, it accommodates
multiple protocols such as DECnet, LAT, TCP/IP, or any other protocol running on
FDDI and Ethernet LANs. The module operates transparently for plug-and-play
network operations and also includes flexible filtering options for destination and
source addresses and protocols.
These features can be accessed through Simple Network Management Protocol
(SNMP) management software, allowing network managers to determine which
users or groups of users can gain access to the networks. As with other bridge
products from Digital, access to network management can be restricted by password
protection.
The DECbridge 900MX standards-compliant technology (IEEE 802.1d, 802.1h,
802.1i, 802.2, 802.3, and ANSI FDDI) ensures operability in multivendor networks.
The module can be configured into the DEChub 900 MultiSwitch (also referred to in
this manual as the DEChub 900) and can also be configured as a standalone unit into
a DEChub ONE docking station (see the DEChub ONE Installation manual).

Features
Your DECbridge 900MX includes the following features:

• High-speed local traffic filtering and forwarding.
• Supports up to 8000 network addresses.

DECbridge 900MX Installation

Introduction (Cont.)
•

Flexible filtering capabilities (source address, destination address, and protocol) for greater network control, increased security and bandwidth utilization,
and reduced propagation of network problems.

•

Configurable rate limiting of multicast packets to limit the spread of multicast and
broadcast storms.

•

Option to turn off automatic learning and manually load the address database.

•

Translation between FDDI and IEEE 802.3/Ethernet frame formats for direct,
transparent connections; translation of AppleTalk 1 and 2 AARP packets; handling of “raw IEEE 802.3” Novell IPX packets.

•

Fragmentation of large FDDI IP packets to legal-size Ethernet packets as per
RFC-791 (Internet Protocol) and RFC-1191 (Path MTU Discovery).

•

Spanning tree loop detection protocol:

•

–

IEEE 802.1d (default)

–

Digital LB100 mode

Built-in SNMP agent supports the following management information bases
(MIBs):
–

SNMP management (RFC-1157)

–

MIB II (RFC-1213)

–

Bridge MIB (RFC-1493)

–

FDDI MIB (RFC-1512)

–

Ethernet MIB (RFC-1398)

–

Digital ELAN MIB Extensions

•

Manageability using any generic SNMP management application that supports
the MIBs listed above.

•

User-friendly advanced Graphical User Interface (GUI) manageability with
Digital’s HUBwatch Network Management Station (NMS) application.

DECbridge 900MX Installation

Introduction (Cont.)
•

One FDDI dual attachment station (DAS) port and six 802.3/Ethernet LAN ports.
Each of the ports (including FDDI PHY ports 1A and 1B) are individually switchable to a DEChub 900 backplane LAN through Hubwatch management. When
connected to a DEChub ONE docking station, one of the 10BaseT ports can be
switched to the DEChub ONE AUI connector.

•

Out-of-band management (OBM) using SNMP over Serial Line Internet Protocol (SLIP) through the OBM connector as an alternative to normal in-band management.

•

Setup port for the initial setup of the module using a setup port device (a terminal
or personal computer).

•

Upgradeable device firmware (in nonvolatile Flash memory) using Trivial File
Transfer Protocol (TFTP) with Digital’s Network Device Upgrade (DECndu) Plus
utility or through the setup port with any TFTP server.

DECbridge 900MX Installation

Front Panel
LED — Lights when the module has
1) Power
power.
LED — Lights when the module
2) Module OK
passes self-test. If the module fails self-test, the Module OK LED
remains off.
LEDs — Show the status of ports 1
3) Port State
to 7. The LEDs can be on, off, or flashing.
4) Network Activity
LED — Indicates network traffic level. The color of the LED (green or yellow) indicates whether the specific port’s network connection
is through the front panel (green) or through the
backplane (yellow).
NOTE:

For more information about the
module’s LEDs, refer to the section
titled LED Descriptions.

(6-pin MJ) connector
5) Optical Bypass Relay
— Allows the connection of an OBR device (not supplied) to maintain connectivity of the FDDI ring in the
absence of power or during fault conditions in a station.
WARNING

To prevent personal injury or
equipment damage, do not insert
telecommunications cables into the
Optical Bypass Relay connector.

6) Dual attachment station (DAS) FDDI port connectors and associated PHY LEDs — Port A is labeled
1A and Port B is labeled 1B. Both ports are standard
FDDI MIC connectors.
7) 802.3/Ethernet AUI (15-pin D-Sub) port connectors. — Refer to the OPEN DECconnect Applications Guide for a list of AUI media adapters you can
use with your module.
8) 10BaseT (8-pin MJ) port connectors — supports
both UTP and STP cabling.

LKG-8708-93I

DECbridge 900MX Installation

Back Panel
1) Locking tab — Locks the module into a DEChub 900
backplane or into the DEChub ONE docking station.
It also contains the hot-swap switch lever.
2) 48-pin connector — Provides network and power
connections to the module when the module is
installed into a DEChub 900 or DEChub ONE docking station.
3) Grounding bolt — Provides a chassis grounding
connection between the module and a DEChub 900
or a DEChub ONE docking station.
4) Manufacturing label — Lists the module part number, serial number, revision level, and power requirements.
5) 160-pin connector — Provides network and power
connections to the module when the module is
installed into a DEChub 900 or a DEChub ONE docking station.
6) Mounting tab — Secures the module to the backplane when the module is installed into a DEChub
900 or a DEChub ONE docking station.
7) Grounding fingers — Provides additional chassis
grounding between the module and a DEChub 900
or a DEChub ONE docking station.
8) Address Label – Represents the lowest of seven
consecutive Media Access Control (MAC) addresses. For example, if this module’s port 1 MAC address
is 08–00–2B–AB–0C–08, then the consecutive port
MAC addresses are:

2
3

Port 1 = 08–00–2B–AB–0C–08
Port 2 = 08–00–2B–AB–0C–09
Port 3 = 08–00–2B–AB–0C–0A
Port 4 = 08–00–2B–AB–0C–0B

Port 5 = 08–00–2B–AB–0C–0C
Port 6 = 08–00–2B–AB–0C–0D

LKG-8709-93I

Port 7 = 08–00–2B–AB–0C–0E

DECbridge 900MX Installation

Installing the Module
The DECbridge 900MX hot-swap feature allows you to install the module into the
DEChub 900 or DEChub ONE docking station without turning off power. Seating the
module initiates the module powerup sequence if enough power is available.

Compare your module’s power
ratings with the values shown in
the Hub Manager status display
(see examples).
Module’s Manufacturing
Label (Example)

If any of the module’s power ratings
exceed the values shown in the
status display, add another power
supply (see the DEChub 900 MultiSwitch Owner’s Manual).
Hub Manager Status
Display (Example)

67.5 W
9.0 A

Available: 90.5 W
5V: 13.0 A, 15V: 3.5 A

0.1 A 12 V
1.5 A 15 V

LKG–9062–94I

NOTE:

The 12V power in the DEChub 900 is derived from the
15V power source. Although it is listed separately in the
product specifications, the 12V requirements are
included in the 15V power total.

Seat the module into the
DEChub 900.

Release lever clicks
when module is
seated.

Hub Manager
status display

a. Place the module’s mounting
tab into a mounting slot on the
DEChub 900.
b. Pivot the module on the mounting tab and align the connectors.
c. Firmly push the module onto the
backplane connectors until the
release lever clicks.
d. Press down on the release lever
to ensure that it is locked.
Mounting tab

LKG–8711–93I

DECbridge 900MX Installation

Installing the Module (Cont.)

Verify that the module’s Power
LED and the Module OK
LED
light (within 1 minute).
LED lights
a. The Power
when power is applied, then
the module performs a selftest.
b. After the module completes
self-test, the Module OK
LED lights and remains lit,
then the Hub Manager status
display shows:
LKG-8712-93I

DECbridge 900MX Up.
NOTE:

Refer to the section titled Problem Solving Using the
LEDs if the LEDs do not operate as described.

Connect the port cables.
Depending on your network configuration requirements, connect FDDI cables, AUI
cables, or UTP/STP cables. After all cables are connected, go to the section titled
Configuring the Module.
See your network manager if you are not sure which cables to connect.
NOTE:

All cables should be installed, tested, and tagged at the
site, prior to this installation.

•

To connect FDDI cables, go to step 5.

•

To connect AUI cables, go to step 6.

•

To connect UTP/STP cables, go to step 7.

•

To connect the Optical Bypass Relay (OBR), refer to the installation instructions included with the OBR.

DECbridge 900MX Installation

Installing the Module (Cont.)

WARNING

Some fiber optic equipment can emit laser or infrared light that
can injure your eyes. Never look into an optical fiber or connector
port. Always assume the cable is connected to a light source.

Connect the FDDI cables.
a. Remove the protective caps
from the module’s FDDI connector and from the FDDI
cable plug.

Locking
clip

b. Align the keyway on the FDDI
cable plug with the key on the
module’s FDDI connector.
c. Insert the plug into the connector, ensuring that the locking clips on the sides of the
plug snap into the locked
position.

Key

LKG–8713-93I

NOTE:

To disconnect the cables, press the locking clips on the
cable plug, then disconnect the cable.

Connect the AUI cables.
a. Push the module’s AUI connector slide latch to the unlocked position.

Unlocked

b. Insert the AUI cable plug into
the AUI connector.

Locked

c. Push the module’s AUI connector slide latch to the
locked position.
LKG–8714-93I

NOTE:

To disconnect the cables, push the connector slide latch
to the unlocked position, then disconnect the cable.

DECbridge 900MX Installation

Installing the Module (Cont.)

Connect the UTP/STP cables.

The DECbridge 900MX module uses straight-through 10BaseT (8-pin MJ) port
connectors. The appropriate UTP/STP cable type, crossover or straight-through, is
required to ensure that the module’s transmit/receive signals connect correctly to the
transmitter/receiver of the connected device.
Before connecting the cables to the module, note the following:

•

If the device you are connecting to the module uses straight-through connectors,
use crossover cables.

•

If the device you are connecting to the module uses crossover connectors, use
straight-through cables.

•

The sum of crossovers must always equal an odd number.
NOTE:

Digital’s straight-through cables are marked (=);
crossover connectors (and cables) are marked (X).

If you need help determining the appropriate cable type to use, refer to the section titled
Connector Pin Assignments.
To connect the UTP/STP cables, complete the following steps:
a. Align the release tab on the
cable plug with the keyway on
the module’s 10BaseT port
connector.

Keyway

b. Insert the plug into the connector, ensuring that the release tab snaps into the
locked position.
Release
tab
LKG–8715-93I

NOTE:

To disconnect the UTP/STP cables, press the release tab.

After all cables are installed, go to the section titled Configuring the Module.

DECbridge 900MX Installation

Removing the Module

WARNING

Some fiber optic equipment can emit laser or infrared light that
can injure your eyes. Never look into an optical fiber or connector
port. Always assume the cable is connected to a light source.

Disconnect all the cables from
the module.
To disconnect:
a. FDDI cables, press the locking clips on the cable plug,
then disconnect the cable.

Locking clip

b. AUI cables, push the connector slide latch to the unlocked
position, then disconnect the
cable.

Unlocked

c. UTP/STP cables, press the
release tab on the cable plug,
then disconnect the cable.

Release
tab

d. The Optical Bypass Relay
(OBR), refer to the instructions included with the OBR.

LKG–8716-93I

Lift release lever

Unseat the module from the
DEChub 900.
a. Lift the release lever located
on the top of the DEChub 900
slot.
b. Pivot the module back on its
bottom mounting tab, and
disengage the module from
the backplane.

Mounting tab
LKG–8717-93I

DECbridge 900MX Installation

Configuring the Module
Setup Port Description
The setup port (on the DEChub 900 MultiSwitch or the DEChub ONE docking
station) allows you to access and set DECbridge 900MX parameters. This section
describes how to access the module from either the DEChub 900 or from the
DEChub ONE docking station.
NOTE:

The setup port screen displays illustrated in this manual
may vary slightly from the actual screen displays on your
setup port device.

The signals from the DEChub 900 Hub Manager setup port and from the DEChub
ONE setup port conform to the EIA-232D signaling standard at 9600 baud. To the
user, the port appears as a data terminal equipment (DTE) device.
NOTE:

Devices that use the EIA-423 signaling standard are
compatible with the DEChub 900 Hub Manager setup
port.

Setup Port Cabling
The setup port on the DEChub 900 MultiSwitch or the DEChub ONE docking station
can be connected to a setup port device (a terminal or personal computer), using the
following cables and adapters (not included in shipping kit).
Cable/Adapter Type

Connecting Device

BN24H-xx1

A terminal with a 6-pin MMJ connector

BN24H-xx1/H8575-A

A terminal with a 25-pin D-Sub connector

BN24H-xx1/H8571-J

A PC with a 9-pin D-Sub communications port

1 xx indicates cable length in meters.

Accessing the Setup Port
To access the setup port on the DECbridge 900MX module, do the following:
1. Ensure that the transmit and receive baud rates on the setup port device are
set to 9600 baud.
2. Connect the setup port device to the setup port connector on either the
DEChub 900 or the DEChub ONE docking station (see illustration).

DECbridge 900MX Installation

Configuring the Module (Cont.)
OBM port
Setup port

To setup port device
H8571-J
H8575-A
BN24H
cable

DEChub 900 MultiSwitch

To setup port device
H8571-J
H8575-A
OBM port

Setup port
DEChub ONE

BN24H cable
LKG–8718-93I

DECbridge 900MX Installation

Configuring the Module (Cont.)
3. Press Return on the setup port device a few times until a menu appears.
a. If the module is connected to the setup port on the DEChub ONE, the
DECbridge 900MX Installation Menu appears. Go to the section titled
DECbridge 900MX Installation Menu (DEChub ONE Options).
b. If the module is connected to the Hub Manager setup port on the
DEChub 900, the Hub Manager Installation Menu appears (see following
example).

HUB INSTALLATION MENU

This menu displays various options that you can choose.
Choose the appropriate selection from this menu
for the Start Redirect Mode option.
(This selection might appear on a submenu.)

Enter selection:

Return

Enter the selection here
and then press Return.

c. Go to the section titled Start Redirect Mode.

DECbridge 900MX Installation

Configuring the Module (Cont.)
Start Redirect Mode
The Start Redirect Mode option redirects the DEChub 900 Hub Manager setup
port to the setup port of any network module (such as the DECbridge 900MX) that is
installed in the DEChub 900. Choosing this option allows you to configure or obtain
status of an installed network module by accessing the module’s installation menu.
After you choose the Start Redirect Mode option from the Hub Manager
Installation Menu, the screen prompts you for a slot number as shown in the following
code example.
The example shows how to select a slot number (user response is shown in
boldface type):

Enter selection: 13

Enter the slot number for redirection (1–8): 3
Setup port redirected to 3: DECbridge 900MX
Attempting to connect ...

Return

Connection successful!

Enter the number
of the slot where
the module is
installed.

After you press Return , the DECbridge 900MX Installation Menu appears on your
screen. Go to the section titled DECbridge 900MX Installation Menu (DEChub 900
Options).

DECbridge 900MX Installation

Configuring the Module (Cont.)
DECbridge 900MX Installation Menu (DEChub ONE Options)
This section shows the options available from the DECbridge 900MX Installation
Menu when the module is installed standalone, in the DEChub ONE docking station.
The following is an example of the DECbridge 900MX Installation Menu:
DECbridge 900MX
DECbridge 900MX INSTALLATION MENU
[1] Reset with Factory Defaults
[2] Reset with Current Settings
[3] Show Current Settings
[4] Set SNMP Read/Write Community
[5] Add SNMP Trap Addresses
[6] Delete SNMP Trap Addresses
[7] Dump Error Log
[8] Set In-Band Interface IP Address
[9] Set In-Band Interface Default Gateway Address
[10] Downline Upgrade
[11] Set Out-of-Band Management (OBM) Interface IP Address
[12] Set Out-of-Band Management (OBM) Port Speed
[13] Module-Specific Options

Enter selection : 1

Choose an option,
then go to the section
titled Description of
Menu Options.

DECbridge 900MX Installation

Return

If you need to assign
an IP address to the
module, choose this
option.

Configuring the Module (Cont.)
DECbridge 900MX Installation Menu (DEChub 900 Options)
This section shows the options available from the DECbridge 900MX Installation
Menu when the module is installed in the DEChub 900 MultiSwitch.
The following is an example of the DECbridge 900MX Installation Menu:
DECbridge 900MX – slot 3
DECbridge 900MX INSTALLATION MENU
[1] Reset with Factory Defaults
Indicates the DEChub 900
[2] Reset with Current Settings
slot number where the
[3] Show Current Settings
module is installed.
[4] Set SNMP Read/Write Community
[5] Add SNMP Trap Addresses
[6] Delete SNMP Trap Addresses
[7] Dump Error Log
[8] Set In-Band Interface IP Address
[9] Set In-Band Interface Default Gateway Address
[10] Downline Upgrade
[11] Module-Specific Options
[Ctrl/C] Return to Hub Manager Menu

Enter selection : 1

Choose an option,
then go to the section
titled Description of
Menu Options.

Return

If you need to assign
an IP address to the
module, choose this
option.

DECbridge 900MX Installation

Configuring the Module (Cont.)
Description of Menu Options
This section describes the menu options that are available from the DECbridge
900MX Installation Menu. Note that the Out-of-Band menu options apply to the
module only when it is in standalone mode (configured in a DEChub ONE docking
station).

[1] Reset with Factory Defaults
This option boots the module, causing the module’s configured NVRAM parameters
to be initialized to factory default values.
CAUTION

This action deletes all configured settings and replaces
them with factory default values. All configuration
settings will be lost.

The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 1
DECbridge 900MX – slot 3
RESET WITH FACTORY DEFAULTS
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
IMPORTANT!
IMPORTANT!
IMPORTANT!
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* This selection will delete the current configuration
*
* settings and reset the system with the factory default *
* settings. All configuration settings will be lost.
*
*
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Press Y to confirm [N] :

Return

Press Return for Main Menu ...

DECbridge 900MX Installation

Configuring the Module (Cont.)
[2] Reset with Current Settings
This option boots the module but leaves the module’s configured NVRAM
parameters at their current values.
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
NOTE:

Allow approximately 1 minute for the module to reset
and complete self-test.

Enter selection : 2
DECbridge 900MX – slot 3

RESET WITH CURRENT SETTINGS
This selection will reset your system with the
current configuration settings.

Press Y to confirm [N] :

Return

Press Return for Main Menu ...

DECbridge 900MX Installation

Configuring the Module (Cont.)
[3] Show Current Settings
This option shows the module’s current settings.
NOTE:

If the module is being configured for the first time, some
fields will be blank.

The following is an example of the display associated with this option:
Enter selection : 3
DECbridge 900MX – slot 3
DECbridge 900MX, 6–Ethernet/FDDI Bridge, HW=v0/0,RO=v.2,SW=v1.1 BL
SysUpTime
: 01:39:11
14 resets
SNMP Read/Write Community
: public
SNMP Trap Addresses
: Not Configured
Status of Last Downline Upgrade
: TFTP Read
00:00:44 28 resets
Transfer Complete.
In-Band Interface Hardware Address
: 08–00–2B–A3–4C–70
In-Band Interface IP Address
: 16.20.216.181
In-Band Interface Default Gateway Address : Not Configured
Port 4 using front panel UTP port

Press Return for Main Menu ...

This line appears only when the module is
connected to a DEChub ONE docking station.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[4] Set SNMP Read/Write Community
This option prompts you to enter the module’s read/write community name.
The format for a community name is a string consisting of 4 to 31 printable ASCII
characters. This community name can be used by SNMP managers for read/write
access control.
The following is an example of an SNMP read/write community name: Karen39
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 4
DECbridge 900MX – slot 3
SET SNMP READ/WRITE COMMUNITY
Format: The format for a community name is a string,
consisting of four to thirty–one printable ASCII
characters, that describes the relationship between an
SNMP agent and one or more SNMP managers. The string
defines the authentication mechanism that is employed
to validate the use of the community by the sending
SNMP entity.

Enter the community string [public] : Karen39

Return

SNMP Read/Write community string set.
Press Return for Main Menu ...

DECbridge 900MX Installation

Configuring the Module (Cont.)
[5] Add SNMP Trap Addresses
This option prompts you to enter IP addresses to which SNMP traps will be sent from
the DECbridge 900MX module.
The format for an SNMP trap address is the standard 4-octet dotted decimal notation,
where each octet of the address is represented as a decimal value, separated by a
decimal point (.).
The following is an example of an SNMP trap address: 16.20.54.156
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 5
DECbridge 900MX – slot 3
ADD SNMP TRAP ADDRESSES
Format: The standard 4 octet dotted decimal notation in which
each octet of the address is represented as a decimal
value, separated by a ’.’ character.
example: 16.20.54.156

Configured SNMP Trap Addresses: 16.20.216.81
Trap address [] : 16.20.54.156
Trap address added!

Return

Add another? [] : Return

Press Return for Main Menu ...

Enter the SNMP trap address that you have
chosen, then press Return.

Appears only if the module has
been previously
configured.
Appears
only if the
module has
been previously configured.
DECbridge 900MX Installation

Configuring the Module (Cont.)
[6] Delete SNMP Trap Addresses
This option prompts you to select SNMP trap addresses for deletion.
The format for an SNMP trap address is the standard 4-octet dotted decimal notation,
where each octet of the address is represented as a decimal value, separated by a
decimal point (.).
The following is an example of an SNMP trap address: 16.20.54.156
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 6
DECbridge 900MX – slot 3
DELETE SNMP TRAP ADDRESSES
Format: The standard 4 octet dotted decimal notation in which
each octet of the address is represented as a decimal
value, separated by a ’.’ character.
example: 16.20.40.156

Configured SNMP Trap Addresses: 16.20.216.81
Trap address [] : 16.20.216.81
Trap address deleted.

Delete another? [] :

Return

Press Return for Main Menu ...

Enter the SNMP trap address that you have
chosen for deletion, then press Return.

Appears only if the module has
been previously configured.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[7] Dump Error Log
This option displays error log dumps for use by Digital support personnel when
analyzing system faults. Up to 4 error log dumps can be stored, and the most recent
dump is displayed first.
The following is an example of the display associated with this option:
Enter selection : 7
DECbridge 900MX – slot 3
DUMP ERROR LOG
CURRENT RESET COUNT: 14
Entry #
= 3
Entry Status = 0 [0=valid, 1=write_error, 2=invalid, 3=empty, 4=crc_error
Entry Id
= 10
Firmware Rev = 1.1
Reset Count = 7
Timestamp
=
0
0
1C7
Write Count = 24
FRU Mask
= 0
Test ID
= A60
Error Data
= SR=2000 PC=03034C4A Error Code=000023C0
Registers
= D0=ECE462A1 D1=9FFF9FFD D2=00000284 D3=EC63F2C5
D4=9FFD9FC7 D5=00000001 D6=00000000 D7=0000FFFF
A0=04800000 A1=0307CE50 A2=04480000 A3=00066914
A4=03001CF8 A5=03020000 A6=0004A8BC A7=00000000

Dump another entry Y/[N]? N

Return

No more Error Log entries.
Press Return for Main Menu ...

DECbridge 900MX Installation

Configuring the Module (Cont.)
[8] Set In-Band Interface IP Address
This option prompts you to enter the module’s IP address.
The format for an IP address is the standard 4-octet dotted decimal notation, where
each octet of the address is represented as a decimal value, separated by a decimal
point (.).
The following is an example of an IP address: 16.20.54.156
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 8
DECbridge 900MX – slot 3
SET IN-BAND INTERFACE IP ADDRESS
Format: The standard 4 octet dotted decimal notation in which
each octet of the address is represented as a decimal
value, separated by a ’.’ character.
example: 16.20.40.156
To delete the IP address, enter 0 in the appropriate
address field.

IP address [16.20.216.179] : 16.20.54.156

Return

IP Address set
Press Return for Main Menu ...

This cell data represents a
previously set IP address.
During the initial setup, this
cell default appears as [].

Enter the module’s IP address,
then press Return.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[9] Set In-Band Interface Default Gateway Address
This option prompts you for a default gateway IP address.
NOTE:

The module does not need to be configured with a
subnet mask for SNMP communications with a
management station that is located on any subnet in the
IP network.

The following is an example of a default gateway IP address: 16.07.80.156
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 9
DECbridge 900MX – slot 3
SET IN-BAND INTERFACE DEFAULT GATEWAY ADDRESS
Format: The standard 4 octet dotted decimal notation in which
each octet of the address is represented as a decimal
value, separated by a ’.’ character.
example: 16.20.40.156
To delete the IP address, enter 0 in the appropriate
address field.

Default Gateway address [] : 16.07.80.156

Return

Default Gateway Address set
Press Return for Main Menu ...

Enter the module’s default gateway
IP address, then press Return.

DECbridge 900MX Installation

Configuring the Module
[10] Downline Upgrade
This option allows you to upgrade the module firmware (in nonvolatile Flash
memory). It prompts you to enter the load image file name and the IP address of your
TFTP (Trivial File Transfer Protocol) load host.
The following is an example of an image file name and an IP address:
/var/db900mx.bin and 16.20.54.156
The format of the image file name is specified according to the conventions used by
your TFTP load host.
!

If power is interrupted during a downline load, the
firmware image can become corrupted. Do not turn off
power to the unit or perform any action that can cause
the unit to lose power during a downline upgrade.

NOTE:

The downline upgrade process can take up to 10
minutes to complete.

CAUTION

Note that the screen display prompts can vary, depending on whether the module is
installed into a DEChub 900 or into a DEChub ONE docking station.
The following description takes you through each step of the upgrade procedure and
explains the events that occur within each selection. A full screen example of the
setup screen display follows the description.

Description
When you select the option, the initial setup screen display appears (see the
following example display). This screen identifies the option and alerts you to be sure
that the power to the module is not interrupted during the downline load.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)
Description (Cont.)
Enter selection : 10
DECbridge 900MX
DOWNLINE UPGRADE
This process upgrade’s the device’s firmware (in
nonvolatile Flash memory). Enter the IP address of
your TFTP (Trivial File Transfer Protocol) load host
and the image file name when prompted.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
IMPORTANT!
IMPORTANT!
IMPORTANT!
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
If power is interrupted during the downline load, the
*
*
firmware image can be corrupted. Do not turn off power *
*
to the unit or perform any action that can cause the
*
*
unit to lose power during a downline upgrade.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

... Press Return Key to Continue ...

The following is an example of the dialog associated with this option (user response
is shown in boldface type):
When you press Return , the screen displays the following prompt:

Enter the Load Filename [] : /var/db900mx.bin

Return

After you enter the load image filename and press Return , the screen prompts you to
enter the IP address of the TFTP server:
Enter the Load Host IP Address []

DECbridge 900MX Installation

:16.20.54.156

Return

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)
Description (Cont.)
After you enter the IP address of the TFTP server and press Return , the screen
displays one of the following screen messages, depending on your configuration:

•

If the module is installed into a DEChub 900, see screen 1.

•

If the module is installed into a DEChub ONE, see screen 2.

Screen 1 (DEChub 900 Configuration)
This screen and dialog appears when the module is installed in a DEChub 900:

Load will be initiated over the In-Band network interface.
The device becomes nonfunctional for up to 10 minutes
during the time that the flash load is in progress.
When the load is complete the screen displays the message:
(Device Not Responding!) This is normal.
... Press Return Key to Start Load [Ctrl/C to abort]...
When you press Return , the load process is initiated over the in-band network
interface. Refer to the description of the load process and subsequent module LED
indications in the section titled Initiating the Load.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)
Description (Cont.)

Screen 2 (DEChub ONE Configuration)
This screen and dialog appears when the module is installed in a DEChub ONE
docking station:
When the module is installed into a DEChub ONE, two network interfaces are
available to select: the module’s in-band network interface, and the OBM interface
residing on the DEChub ONE docking station. Each network interface has its own IP
address. When the firmware reads more than one IP address (therefore more than
one network interface), it prompts you to select a network interface to use for the load
request.

Load will be initiated over the In-Band network interface.
Would you like to use a different interface? Y/[N]:

Return

If you select the default [N], the setup screen displays the following message:

The device becomes nonfunctional for up to 10 minutes
during the time that the flash load is in progress.
... Press Return Key to Start Load ...
Pressing Return for this selection initiates the load over the module’s in-band network
interface. Refer to the description of the load process and subsequent module LED
indications in the section titled Initiating the Load.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)
Description (Cont.)
If you selected Y at the screen prompt, the setup screen displays the following:
Interface
–––––––––
1
8

Description
–––––––––––
In-Band
OBM Port

Enter the network interface to be used [1]:

If you select 8, then press Return , the setup screen displays the following message:

The device becomes nonfunctional for up to 10 minutes
during the time that the flash load is in progress.
... Press Return Key to Start Load ...
Pressing Return for this selection initiates the load over the DEChub ONE docking
station’s OBM port. Refer to the description of the load process and subsequent
module LED indications in the section titled Initiating the Load.

Initiating the Load
After you initiate the process (by pressing Return at the screen prompt), the screen
displays the following message:

DLU process started!
............................................................
...........................

The series of dots (. . . . . . .) that appear on the screen indicate that the load is in
progress. When the series of dots end, the screen displays the following message:
Transfer complete.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)
Initiating the Load (Cont.)
After the TFTP load transfer is completed, and the TFTP image has been verified, the
module becomes nonfunctional and the flash load process begins. (The flash load
process can take up to 10 minutes to complete.)
Note that if you are initiating the load process from a DEChub 900, the Hub Manager
firmware attempts to communicate with the module. Because the module is
nonfunctional during the flash load process, communications between the module
and the Hub Manager cannot take place. Therefore, the Hub Manager status display
shows the following message:
Hub Manager Status Display
4: DECbridge 900MX
Unknown

At the same time, the setup screen displays the following message (note that this
message does not appear if you are initiating the load process from a DEChub ONE
docking station.):

Device not Responding!

Connection closed!

This is normal. The flash load is in progress and will take up to 10 minutes to
complete. Do not interrupt power to the module while the downline load is in
progress.
CAUTION

If power is interrupted during a downline load, the
firmware image can become corrupted. Do not turn off
power to the unit or perform any action that can cause
the unit to lose power during a downline upgrade.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)
Initiating the Load (Cont.)
LED Display During the Load Process
While the load is in progress, the LEDs display the following sequence of events:
1. Port State

LED 4 lights (green) and remains lit for up to 1 minute.

2. Port State

LED 5 lights (green) and remains lit for up to 2 minutes.

This sequence indicates that the downline upgrade is in progress.
3. After Steps 1 and 2 are completed, all Port State
LEDs flash alternately
(green/yellow) for 10 seconds, then the module boots and starts executing the
upgraded image.
If Port State
LEDs (4 and 5) do not light, the load did not succeed. Check that the
load host is operational.
LEDs turn on yellow (after Port State
LED 4 or 5 lights), a
If all Port State
loading error has occurred. If this occurs, retry the loading process. If the problem
persists, contact your Digital Service representative.
(An example of the setup screen display follows this section.)

DECbridge 900MX Installation

Configuring the Module (Cont.)
[10] Downline Upgrade (Cont.)

Enter the Load Filename [] : /var/dc900mx.bin
Enter the Load Host IP Address []

: 16.20.54.156

Load will be initiated over the In-Band network interface.
Would you like to use a different interface? Y/[N]: Return
The device becomes nonfunctional for up to 10 minutes during
the time that the flash load is in progress.
When the load is complete the screen displays the message:
(Device Not Responding!) This is normal.
... Press Return Key to Start Load [Ctrl/C to abort]...
DLU process started!
............................................................
............................................................
Transfer complete.
Device Not Responding! Connection closed!

Press Return for Main Menu ...

Module communications
suspended during load
process. This is normal.

Enter the load image filename, then press Return

Indicates that the downline
upgrade loading process
has been initiated.

Enter the IP address
of the TFTP server,
then press Return

Only appears when the module is in a DEChub ONE
and both interfaces are configured with IP addresses.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[11] Set Out-of-Band Management (OBM) Interface IP Address
NOTE:

This selection is operational only when the module is in
standalone mode (for example, when it is installed in a
DEChub ONE docking station).

This option prompts you to enter the IP address of your out-of-band management
interface.
This option allows you to manage your module through the OBM port, located on the
DEChub ONE docking station, as an alternative to normal in-band management. To
enable out-of-band management, assign an OBM IP address (use this option [11]),
then select an OBM port speed (use option [12]). See the DEChub ONE Installation
manual for OBM cabling information.
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 11
DECbridge 900MX
SET OUT-OF-BAND MANAGEMENT (OBM) INTERFACE IP ADDRESS
Format: The standard 4 octet dotted decimal notation in which
each octet of the address is represented as a decimal
value, separated by a ’.’ character.
example: 16.20.40.156
To delete the IP address, enter 0 in the appropriate
address field.

IP address [] :

16.20.54.156

Return

Press Return for Main Menu ...

Enter the module’s OBM IP
address, then press Return.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[12] Set Out-of-Band Management (OBM) Port Speed
NOTE:

This selection is operational only when the module is
installed into a DEChub ONE docking station.

This option prompts you to select and enter the speed of your out-of-band
management (OBM) port.
NOTE:

The port speed at each end of the communications link
must be identical.

The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 12
DECbridge 900MX
SET OUT-OF-BAND (OBM) PORT SPEED
[1] 2400 baud
[2] 9600 baud
[3} 38400 baud

Enter selection [2] (9600) : 2

Return

OBM port speed set.
Press Return for Main Menu ...

The OBM port speed you
select must match the speed
of your setup port device.

DECbridge 900MX Installation

Configuring the Module (Cont.)
[13] Module-Specific Options
NOTE:

This option appears as menu selection [11] when the
module is installed in the DEChub 900. Selection 1 from
this submenu takes effect only when the module is in
standalone mode.

This option provides module-specific selections for the user. When selected, the
option offers two selections: Set Ethernet configuration in standalone mode, and
Return to Main Menu.

Set Ethernet Configuration in Standalone Mode
This selection allows you to toggle the connection of port 4 (the module’s third
Ethernet port) between the module’s front panel and the AUI port on a DEChub ONE
LED corresponding to that port will
docking station. Note that the Network Activity
change to yellow, indicating that the port is now connected to the AUI port on the
DEChub ONE docking station.
The following is an example of the dialog associated with this option (user response
is shown in boldface type):
Enter selection : 13
DECbridge 900MX
DECbridge 900MX Installation
[1] Set Ethernet configuration in standalone mode
[2} Return to Main Menu

Enter selection : 1

Return

NOTE: This will only take effect when the product is standalone.
Change Port 4 to use docking station AUI port?
Press Y to confirm [] : y

Return

Press Return for Main Menu ...

This prompt changes to:
Change Port 4 to use front panel UTP port?

when port 4 is already connected to the docking station’s AUI port.

DECbridge 900MX Installation

LED Descriptions
The module LEDs provide dynamic indications of the status of the module. The LEDs
can be in various states (on, off, or flashing), and can change color (green or yellow)
depending on the operational status of the module or the level of activity on the
network. Table 1 shows the static states that are possible for each of the module
LEDs.
The PHY LEDs (see Table 2) indicate the status of the connection between the
module and the FDDI network.
Table 1

Module LED States

LED Name

Off

On (Green)

On (Yellow)

Flashing

Power

No power to
module.

Module receiving
power.

N/A.

N/A

Module
OK

Self-test failed Module passed
(if more than
self-test.
60 seconds
elapsed).

N/A.

Nonfatal error.
(Fan failure.)

Port
State

Bad or no
connection.

Port is in the
Port failure.
Forwarding state.

Network
Activity

No network
activity.

Network activity.
Port connected to
network through
module front panel connector.

Table 2

FDDI PHY LED States
Off

LED
Name
PHY

Ready to
connect

Network activity. Intermittent
Port connected network
to network
activity.
through hub
backplane.

No Color Green

Flashing
Yellow

Good
Link Error
connection Rate exceeded

DECbridge 900MX Installation

Port in Backup,
Listening,
Learning, or
management
Disabled state.

Green /
Yellow

Green

Yellow

Disabled/
Broken

Illegal/
Standby/
unwanted Dual
connection homing

Problem Solving Using the LEDs
When diagnosing a problem with the module, note that the problem is often indicated
by the combined states of the module LEDs. Table 3 lists the typical combined states
of the LEDs for various error conditions that can occur during initial installation of the
device, along with probable causes and corrective actions to take.

Normal Powerup
When the module power is initially turned on, the following events occur:
1. The module Power

LED lights as soon as power is applied to the unit.

2. The module initiates its built-in self-test. Flashing Port State
LEDs indicate
that the module is running various subroutines as part of the self-test.
3. After the successful completion of self-test (within 60 seconds after power is
applied), the the Module OK
LED lights, and remains lit.
, Network Activity
, and PHY LEDs)
4. The remaining LEDs (Port State
now indicate their operational status, as described in Table 3.
Table 3

Problem Solving Using the LEDs

Symptom

Probable Cause

Corrective Action

Power

The module is not
receiving +5Vdc.

Check the power status on the Hub
Manager status display.

LED is off.

If the Hub Manager status display indicates that power is available for this
module, press the release lever down
and reseat or remove the module.
Inspect the module’s 48- or 160-pin
connector for bent, broken, or dirty
pins.
If the problem persists, replace the
module.
(continued on next page)

DECbridge 900MX Installation

Problem Solving Using the LEDs (Cont.)
Table 3 (Cont.)

Problem Solving Using the LEDs
Probable Cause

Symptom
Module OK
is off.

LED

Corrective Action

Self-test in progress. Wait for self-test to complete.
Self-test failed.

If the LED does not light within
60 seconds, lift the release lever momentarily to repeat the
self-test.
If self-test fails again, replace
the module.
Contact your Digital Service
representative to correct the
problem.

Module OK
LED
is off and Port State
LED for Port 1 is on
green.

Module firmware
image is corrupted.

A nonfatal error
Module OK
LED
is flashing, but module occurred.
continues to operate
normally.
Port State
is off.

LED

Port State
yellow.

LED is on. Port failure.

Port State LED is
flashing green.

DECbridge 900MX Installation

Contact your Digital Service
representative to correct the
problem.
Cycle power. If the problem persists, contact your Digital Service representative to correct
the problem.

Port not connected
Missing, loose, or incorrect
or connection is bad. cable. Correct the cable connection.

The corresponding
port is in one of the
following bridge
states: Backup,
Preforwarding or
Disabled.

Contact your Digital Service
representative to correct the
problem.
None –– normal operation.

Connector Pin Assignments
10BaseT (8-pin MJ) Port Connector
The following illustration shows the 8-pin MJ (straight-through) connector and its pin
assignments:
Pin

Assignment

1
2
3
4
5
6
7
8

TX+
TX–
RX+
Unused
Unused
RX–
Unused
Unused

8-pin MJ connector
LKG-8719-93I

NOTE:

All 10BaseT port connectors on the module are
(straight-through) connections.

Optical Bypass Relay (6-Pin MJ) Connector
The Optical Bypass Relay (OBR) feature on the module maintains FDDI dual-ring
integrity if the module fails or if the power to the module is turned off. The following
illustration shows the OBR 6-pin MJ connector and its pin assignments. Refer to this
information when selecting optical bypass devices.
Pin
Pin

Assignment

1,2
3,4,6
5

Relay drive; +5V @ 200 mA (max.)
Return; grounded internally
Bypass present; must be externally
grounded to pin 3,4, or 6

6-pin MJ connector
LKG-8720-93I

DECbridge 900MX Installation

Connector Pin Assignments (Cont.)
Internal and External Crossover Configurations
A crossover function must be implemented in every twisted-pair link. The crossover
function (internal or external) allows the transmitter of one device to connect to the
receiver of the device at the other end of the twisted-pair link.
The following illustration shows the use of straight-through and crossover cables for
connecting internal and external crossover type devices. The DECbridge 900MX
uses straight-through connectors:
External Crossover Configuration
8 MJ
1
2
3
4
5
6
7
8

8 MP
TX+
TX–
RX+

RX–

8 MJ

8 MP

1
2
3
4
5
6
7
8

DECbridge 900MX

TX+
TX–
RX+

RX–

1
2
3
4
5
6
7
8

Device (MAU)

Crossover (X)
cable (BN24F)

Straight-through
connector

Internal Crossover Configuration
8 MJ
T

1
2
3
4
5
6
7
8

8 MP
TX+
TX–
RX+

RX–

1
2
3
4
5
6
7
8

RX+
RX–
TX+

TX–

1
2
3
4
5
6
7
8

Device (Repeater)

DECbridge 900MX

Straight-through
connector

8 MJ

8 MP

Straight-through (=) cable
(BN26K or BN25G)

Crossover (X)
connector
LKG-9097-94I

Digital Confidential

DECbridge 900MX

Connector Pin Assignments (Cont.)
H8571-J Adapter
The following illustration shows the H8571-J adapter (6-pin MMJ to 9-pin D-Sub
connector) and its pin assignments:

9 D–Sub(F)
6 MMJ
1
2
3
4
5
6

DCD
SD
RD
DTR
GND
DSR
RTS
CTS
RI

1
2
3
4
5
6
7
8
9

LKG-5342-91I

H8575-A Adapter
The following illustration shows the H8575-A adapter (6-pin MMJ connector to 25-pin
D-Sub connector) and its pin assignments:
25 D–Sub(F)
6 MMJ
DTR
TX+
TX–
RX–
RX+
DSR

1
2
3
4
5
6

1
2
3
4
5
6
7
8
20

H8575-A
Note that EOS/ESD protection devices are not shown on diagram
LKG–8793–93I

DECbridge 900MX Installation

Connector Pin Assignments (Cont.)
BNE4C/D AUI (15-pin D-Sub) Port Connector
The following illustration shows a 15-pin AUI connector and its pin assignments:

Pin Ports

1
2
3
4
5

6
7
8
9
10

11
12
13
14
15

Ground
CI+
DO+
Ground
DI+

Power rtn
NC
Ground
CI–
DO–

Ground
DI–
Power (12V)
Ground
NC

15-pin AUI
connector
LKG-8866-93I

Digital Confidential

DECbridge 900MX

Product Specifications
Operating specifications for the DECbridge 900MX module are provided in Table 4.
The module’s acoustical specifications are listed in Table 5.
Table 4

DECbridge 900MX Operating Specifications

Parameter

Specification

Operating Environment
Operating Temperature1

5°C to 50°C (41°F to 122°F)

Relative Humidity

10% to 95% noncondensing

Altitude

Sea level to 4900 m (16,000 ft)

Power

67.5 W, total power
9.0 A, 5Vdc,
0.1 A, 12Vdc2
1.5 A, 15Vdc

Connectors
1 Dual Attachment Station (DAS) FDDI port multimode optics (ANSI MIC), 1 Shielded
6-pin MJ (OBR), 2 15-pin D-Sub (AUI ports), 4 Shielded 8-pin MJ (10BaseT ports).
(DEChub ONE has 1 8-pin MJ, 1 DB-9, and 1 15-pin D-Sub AUI connector.)
Physical
Height

44.45 cm (17.5 in)

Width

4.45 cm (1.75 in)

Depth

15.25 cm (6 in); 25.40 cm (10.0 in) with a
DEChub ONE docking station.

Weight

1.8 kg (4 lb); 3.4 kg (7.5 lb) with a
DEChub ONE docking station.

Certification
CE, CSA, FCC,TÜV, UL, VCCI.
1 For sites above 4900 m (16,000 ft), decrease the operating temperature specification by

1.8°C for each 1000 m or 3.2°F for each 3200 ft.
2 The 12V power in the DEChub 900 is derived from the 15V power source. Although it is

listed separately in the product specifications, the 12V requirements are included in the 15V
power total.

DECbridge 900MX Installation

Product Specifications (Cont.)

Table 5

Acoustical Specifications
Acoustics — Declared values per ISO 9296 and ISO 77791
Sound Power Level
LWAd, B

Sound Pressure Level
LpAm, dBA
(bystander positions)

Idle/Operate

DEFBA-MA

5.0

DEFBA-MA + DEHUA

5.4

Product

Schallemissionswerte — Werteangaben nach ISO 9296 und ISO 7779/DIN EN277792
Schalleistungspegel
LWAd, B

Schalldruckpegel
LpAm, dBA
(Zuschauerpositionen)

Leerlauf/Betrieb

DEFBA-MA

5,0

DEFBA-MA + DEHUA

5,4

Produkt

1 Current values for specific configurations are available from Digital Equipment Corporation

representatives. 1 B = 10 dBA.
2 Aktuelle Werte für spezielle Ausrüstungsstufen sind über die Digital Equipment Vertretungen

erhältlich. 1 B = 10 dBA.

DECbridge 900MX Installation

Associated Documents
DEChub 900 MultiSwitch
Owner’s Manual
EK–DH2MS–OM

Provides installation, use, security, and
troubleshooting information.

DEChub ONE Installation
EK–DEHU2–IN

Provides installation and operation guidelines
for single-slot hub configuration, including
rack-mount options and cabling.

HUBwatch Installation and
Configuration
AA–Q0FXB–TE

Provides information for installing and
configuring HUBwatch for Open VMS V3.0 and
HUBwatch for Windows V2.0.

HUBwatch Use
AA–PW4BC–TE

Provides network management, and DEChub
functionality information for HUBwatch for
Open VMS V3.0.

Using DECndu Plus
(MS–DOS)
AV–PYVVA–TE

Provides the instructions to upgrade the
firmware in an MS–DOS environment of
selected network devices using Digital’s
Network Device Upgrade (DECndu) Plus utility.

Using DECndu Plus
(ULTRIX RISC)
AV–PYVTA–TE

Provides the instructions to upgrade the
firmware in an ULTRIX RISC environment of
selected network devices using Digital’s
Network Device Upgrade (DECndu) Plus utility.

Using DECndu Plus
(OpenVMS VAX)
AV–PYVRA–TE

Provides the instructions to upgrade the
firmware in an OpenVMS VAX environment of
selected network devices using Digital’s
Network Device Upgrade (DECndu) Plus utility.

OPEN DECconnect
Applications Guide
EC–G2570–42

Contains general descriptions to help plan and
install networking systems based on Digital
Equipment Corporation’s OPEN DECconnect
System and networking products.

Bridge and Extended
LAN,Reference
EK–DEBAM–HR

Describes how bridges are used to create
extended local area networks (LANs). The
descriptions include the use of bridges in
extended LAN configurations, information on
LAN interconnections, overall bridge operation,
spanning tree, bridge management, and
solving bridge-related problems in a network.

Digital Confidential

Document Name

HOW TO ORDER ADDITIONAL DOCUMENTATION
DIRECT TELEPHONE ORDERS
In Continental USA
call 1-800-DIGITAL
(1-800–344-4825)

In Canada
call 1–800–267–6215

In New Hampshire,
Alaska or Hawaii
call 1–603–884–6660

ELECTRONIC ORDERS (U.S. ONLY)
Dial 1-800-dec-demo with any VT100 or VT200
compatible terminal and a 1200 baud modem.
If you need assistance, call 1-800-DIGITAL (1-800-344-4825)

DIRECT MAIL ORDERS (U.S. and Puerto Rico*)
DIGITAL EQUIPMENT CORPORATION
P.O. Box CS2008
Nashua, New Hampshire 03061

DIRECT MAIL ORDERS (Canada)
DIGITAL EQUIPMENT OF CANADA LTD.
940 Belfast Road
Ottawa, Ontario, Canada K1G 4C2
Attn: A&SG Business Manager

INTERNATIONAL
DIGITAL EQUIPMENT CORPORATION
A&SG Business Manager
c/o Digital’s local subsidiary
or approved distributor

Internal orders should be placed through U.S. Software Supply Business (SSB),
Digital Equipment Corporation, 10 Cotton Rd. Nashua, NH. 03063-1260

*Any prepaid order from Puerto Rico must be placed
with the Local Digital Subsidiary:
809–754–7575

DECbridge 900MX Installation
EK-DEFBA-IN. A01
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