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EK-DTROS-IN-A01

August 1993

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Document:	DECrepeater 900SL Installation
Order Number:	EK-DTROS-IN
Revision:	A01
Pages:	15
Original Filename:

OCR Text

DECrepeater 900SL
INSTALLATION

LKG–8181-93I

DEChub ONE Repeater 900SL

DECrepeater 900SL
PK–02580–IL

The DECrepeater 900SL is a Token Ring repeater that operates at a speed of 4 or 16
Mb/s. It extends trunk and lobe distances for shielded 150-ohm cable. As a member
of Digital’s Token Ring product family, it operates in a DEChub 900 MultiSwitch, or
as a standalone unit (DEChub ONE Repeater 900SL). The DECrepeater 900SL
can also be managed by optional HUBwatch management software.

EK–DTROS–IN. A01

Copyright
EK–DTROS–IN. A01
August 1993
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  1993 by Digital Equipment Corporation
All Rights Reserved.
Printed in U.S.A.

The following are trademarks of Digital Equipment Corporation:

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, etc.
Read the instructions for correct handling.

DECrepeater 900SL

Front Panel

1) Power LED. Lights when the repeater has power.
1

2
2) Module OK LED. Lights when the repeater passes
self-test. If the repeater fails self-test, the Module OK
LED is off.

3
4
5

3) Ring A/B LEDs. In a DEChub 900 MultiSwitch,
when either the A LED or the B LED is on, the
respective A or B ring is active. In a standalone
repeater, both Ring LEDs are always off.
6
4) Speed LEDs. Either the 16 LED or the 4 LED is on
to show the ring speed.
5) Ring In LED. Lights when a Ring In connection is
active.

6) Ring Out LED. Lights when a Ring Out connection
is active.

7) Speed Switch. Sets speed. Set to 16 when the
network speed is 16 Mb/s. Set to 4 when the
network speed is 4 Mb/s. Network management
cannot override Speed switch settings.

8) Ring In Port. Connects Ring In to the Ring Out port
of a repeater or Multistation Access Unit (MAU).

9) Autowrap Switches. Determine whether or not the
repeater automatically loops back when it detects a
disconnected link on Ring In or Ring Out. If the Ring
In or Ring Out port connects to a device with Digital’s
Autowrap, set the switch to 1 to enable Autowrap.
If the Ring In or Ring Out port connects to a device
without Digital’s Autowrap, set the switch to 0 to
disable Autowrap.

10) Ring Out Port. Connects Ring Out to the Ring In port
of a repeater or Multistation Access Unit (MAU).
LKG-8254-93I

DECrepeater 900SL

11) Reset Switch. Resets all settings, except for the
Speed switch setting, to their factory defaults. To
reset: while turning on the power, press the reset
switch with a pen or screwdriver.

Rear Panel of DEChub ONE Repeater 900SL

Note:
The rear panel shown here is used only when the
repeater is in a standalone configuration.
12) Power Connector. Provides power connection for
the repeater. (DEChub ONE only)

PK–02586–IL

LKG-8188-93I

DECrepeater 900SL

Installing a Repeater in a DEChub 900 MultiSwitch

Remove the rear cover (if necessary).
If you want to install a DEChub ONE Repeater 900SL in a hub,
you need to remove the rear cover.
a. Lift up the latch on the rear cover
by inserting a small flat-blade
screwdriver into the top mounting
hole.
b. With the latch up, pull the top of the
rear cover away, pivoting around the
bottom of the repeater.
LKG-8182-93I

Set Speed switch.

Set the Speed switch to 16 when the
network speed is 16 Mb/s or 4 when
the speed is 4 Mb/s.

LKG–8183-93I

DECrepeater 900SL

Installing a Repeater in a DEChub 900 MultiSwitch (continued)

Install the repeater on the hub.
The release lever is
lifted and clicks
back into place
as the module
is seated.

Note:
Before installing the module in a hub, verify that the
module’s input power rating does not exceed the
available power that the Hub Manager LCD displays.
a. Align the repeater’s 48-pin
connector with any available 48-pin
slot in the hub.
b. Place the repeater’s bottom
mounting tab into the mounting slot
on the hub.
c. Pivot the repeater into place. You
hear a click when the repeater is
seated.
d. Press down on the release lever
to ensure that it is locked.

Mounting
tab

LKG–8256–93I

Connect hubs or station.

e. With power on in the hub, verify that
the Power, Module OK, and Speed
LEDs are on. If there is traffic on the
network, the Ring A or B LED will
also be on.
To connect two hubs . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 to enable Autowrap.
b. Connect the repeater’s Ring Out port to
the Ring In port of the repeater in the
adjacent hub. Also connect the repeater’s
Ring In port to the Ring Out port of the
repeater in the adjacent hub.
c. Once the ring becomes active, verify that
the Ring In and Ring Out LEDs are on.

LKG–8184-93I

To use as a lobe extender . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 to enable
Autowrap.
b. Connect the station to the Ring Out port.
c. Once the ring becomes active, verify that
the Ring Out LED is on.

DECrepeater 900SL

Installing a DEChub ONE Repeater 900SL
 Mount repeater (optional).
You can place the repeater on a table, mount it on a wall, or install it in a standard 19-inch rack
using a shelf assembly, Digital part number H9544-MS.
For a wall mounting, position two screws 19.7 centimeters (7.75 inches) apart on the wall. Turn
screws until tight, and then back off two turns. Hang the repeater using the keyholes.

Set Speed switch.
Set the Speed switch to 16 when the
network speed is 16 Mb/s or 4 when the
speed is 4 Mb/s.

LKG–8286-93I

Connect power supply.

a. Connect the power supply cable to
the power connector.
b. Plug the power supply into a wall
outlet.
c. With power on, verify that the Power
and Module OK LEDs are on.

LKG–8185-93I

To
Power
Supply
DECrepeater 900SL

Installing a DEChub ONE Repeater 900SL (continued)
 Connect a MAU, repeater, or station.

To connect an adjacent MAU or
repeater . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 or 0. Refer
to page 3 for information on the
Autowrap switch settings.
b. Connect the repeater’s Ring Out
port to the Ring In port of the
adjacent MAU or repeater.
c. Connect the repeater’s Ring In port
to the Ring Out port of the adjacent
MAU or repeater.
d. Once the ring becomes active, verify
that the Ring In and Ring Out LEDs
are on.

To use as a lobe extender . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 to enable
Autowrap.
LKG-8186-93I

b. Connect the station to the Ring Out
port.
c. Connect the Ring In port to a station
port on a MAU.
d. Once the station becomes active,
verify that the Ring Out LED is on.

DECrepeater 900SL

Removing a Repeater from a DEChub 900 MultiSwitch

Disconnect the station and trunk connector cables
from the repeater.

Remove the repeater from the hub.
Note:
When you remove a repeater from the
DEChub 900 MultiSwitch, do not turn off the
hub power.

a. Lift up the release lever on the
hub.
b. Pivot the repeater back on its
bottom mounting tab until it
disengages from the hub.

Lift the release lever.

Mounting
tab
LKG–8144-93I

DECrepeater 900SL

LED Summary
The LEDs indicate status by being on, off, and flashing. Flashing LEDs indicate special situations.
There are two flashing patterns and a scroll pattern. When an LED indicates a continuous single-flash
pattern, network management has disabled the port. A continuous double-flash pattern indicates the
wrong speed. In a scroll pattern, the LEDs turn on and off in a set order.

LED1

Off

Flashing

Power

No power

Power OK

N/A

Module OK Self-test failed
or not operating

Self-test OK

N/A

Speed
No power, or
(4/16 Mb/s) repeater needs
an upgrade.
(see Ring A/B
LEDs)

Valid speed

N/A

Ring In/
Ring Out

Connected to network

Continuous single flash: network
management disabled port.
Continuous double flash: wrong speed.

Connected to Ring A
or Ring B

Continuous single flash: network
management disabled port.
A and B alternately flash: repeater needs
an upgrade or an upgrade is in progress.

Inactive or
wire fault

Hub MAU ONLY:
Ring A/B

1 Scroll:

Not connected

During power-up self-tests, all LEDs, except for the Power LED, will indicate a scrolling
pattern.

Ring Speed Note:
Even if you set the repeater’s Speed switch to the wrong speed, no data will be lost or corrupted. Traffic
loops back at the point where there is a speed mismatch, and the rest of the network remains
operational.

The repeater’s speed detection feature protects the network from devices that are set at the wrong network speed. When using some non–Digital equipment, isolating faults and reconfiguring the network
may take up to 20 seconds.
10

DECrepeater 900SL

Repeater Cabling
Table 1 lists the maximum distance between two adjacent repeaters, and between a repeater and
a station.
Table 1 Maximum Cable Length between Active Units1
Speed

STP

4 Mb/s

600 m (1967 ft)

16 Mb/s

300 m (983 ft)

1 All distances include patch cables and hub connections.

Table 2 shows the industry guideline for cable length between a repeater and a passive MAU.
Although cable lengths in excess of these distances are physically possible with a DECrepeater
900SL, Digital recommends that you keep cable lengths within the maximums found in the industry
guideline to allow for future network expansion and upgrade.
Table 2 Industry Cable Length Guideline between a Repeater and a Passive MAU1

Speed

STP

4 Mb/s

100 m (327 ft)

16 Mb/s

100 m (327 ft)

1 All distances include patch cables and hub connections.

DEChub 900 MultiSwitch Configuration
Multiple Hubs
A repeater is needed in each DEChub 900 MultiSwitch to connect hubs in a multiple hub network.

DECrepeater 900SL

Repeater Cabling (continued)
DEChub ONE Configuration
UTP Cable:
Multiple Wiring Closets
Digital recommends that you use repeaters to segment the ring in a network with multiple wiring
closets.
When distances exceed the lobe lengths in Table 2, or if the MAU does not have Digital’s Autowrap
functionality, two repeaters are required.
When a MAU has Autowrap enabled, only one repeater is required per wiring closet if the distance
between the wiring closets does not exceed the distances shown in Table 2.

DECrepeater 900SL

Problem Solving

If ...

Then ...

Do This ...

DEChub 900 MultiSwitch and DEChub ONE
Power LED is off.

Repeater does not have
power.

Verify that outlet has power.
Check power connection to
repeater.
Replace power supply.
Replace repeater.

Module OK LED is off.

Repeater failed self-test.

Replace repeater.

Ring A and B LEDs alternately Repeater needs an upgrade
flash.
.
or an upgrade is in progress.

If you have network management,
do a downline load;
otherwise, replace repeater.
Wait for upgrade to complete.

Ring In or Ring Out LED has
single flash pattern.

Network management
disconnected the repeater’s
RI or RO port.

To change settings, you can use
network management commands
or the repeater’s Reset switch.

Ring In or Ring Out LED has
double flash pattern.

Repeater and ring have
different speed settings.

Change the speed setting of the
repeater, stations or the ring.

DECrepeater 900SL

Problem Solving (continued)

If ...

Then ...

Do This ...

DEChub 900 MultiSwitch ONLY
Ring In, Ring Out and Ring A/B Network management has
LEDs flash together.
disabled repeater.

To change settings, you can use
network management commands
or the repeater’s Reset switch.

Repeater does not connect to
hub.

Network management will not
connect repeater to hub.

Check speed and hub
settings for incorrect network
management overrides.

Repeater does not work
in a DEChub 90.

DEChub 90 only supports
Ethernet networks.

A DEChub 900 MultiSwitch
supports token ring networks.

DEChub ONE ONLY
Ring In and Ring Out LEDs
flash together.

Network management has
disabled repeater.

To change settings, you can use
network management commands
or the repeater’s Reset switch.

Vendor’s MAU or repeater
causes loopback on ring.

Vendor’s unit is incompatible
with Digital’s Autowrap.

Set Autowrap switches to 0 on the
DECmau or DECrepeater adjacent
to the vendor’s unit.

Network crashes when a MAU Vendor’s unit does not have
or repeater fails.
Digital’s Autowrap.

Set Autowrap switches to 1 on the
DECmau or DECrepeater adjacent
to the failed unit.

DECrepeater 900SL

Product Specifications
Product Specification

In a Hub

DEChub ONE

Height
Width
Depth

27.3 cm (10.8 in)
3.2 cm (1.2 in)
11.2 cm (4.4 in)

27.3 cm (10.8 in)
3.2 cm (1.2 in)
13.7 cm (5.4 in)

Weight

0.68kg (1.5 lb)

0.77kg (1.7 lb)

Operating temperature

5° C to 50° C (41° F to 122° F)

Relative humidity

10% to 95% non-condensing

Altitude

Sea level to 4900 m (16,000 ft)

Power Supply

Hub provides

Provided by:
H7082–AB

Input Power

7 W @ +5 Vdc

Connectors

DB9

Agency certification

CE, CSA, FCC, TÜV,
UL, VCCI, VDE

Acoustics: Preliminary
declared values per ISO
9296 and ISO 7779

No acoustic noise

Schallemissionswerte:
Vorläuge Werteangaben
nach ISO 9296 und ISO
7779/DIN EN27779

keine meßbaren Schallemissionen

Associated Documents
DEChub 900 MultiSwitch
Owner’s Manual

DECrepeater 900SL

This manual provides overview, installation, and problem
solving information for the DEChub 900 MultiSwitch.