DECbridge 90FL Owner's Manual

This Owner's Manual provides comprehensive information for the DECbridge 90FL, a Local Area Network (LAN) device designed to connect two Ethernet or IEEE 802.3 LANs, forming a single extended network. Its primary purpose is to enhance network reliability and efficiency by partitioning LANs into smaller segments (a backbone and a work group), thereby isolating traffic.

Key aspects covered include:

• Features and Description: The DECbridge 90FL offers easy-to-use, plug-and-go connectivity with activity LEDs for diagnosis. It supports frame and protocol filtering for efficient traffic management. It connects to a "backbone" LAN (unrestricted stations) via fiber-optic (10Base-FL) or 15-pin AUI Ethernet (10Base5) interfaces, and to a "work group" LAN (optimized for <200 stations) via an integral ThinWire (10Base2) interface.
• Configuration: Provides rules and guidelines for setting up the bridge, including considerations for work group size (traffic isolation is reduced in "flood mode" if over 200 stations) and managing redundant connections using a spanning tree algorithm to prevent loops.
• Installation: Details how to install the DECbridge 90FL as a standalone unit (desk or wall-mounted, requiring an external power supply and ThinWire termination) or by inserting it into a DEChub 90 backplane (where it draws power and integrates automatically). It also covers site considerations and proper cable connections.
• Management: The device is managed through the Maintenance Operations Protocol (MOP) console carrier (accessible from VMS or ULTRIX systems) or by Remote Bridge Management Software (RBMS). MOP allows users to examine and configure bridge characteristics, port status, address databases, and protocol filters, including enabling/disabling flood mode and setting passwords. RBMS provides more advanced network management.
• Troubleshooting: Offers guidance on diagnosing issues using the front panel indicator lights (LEDs) and provides a list of common problems with suggested corrective actions. Customer service options are also provided.
• Appendices: Include detailed specifications (physical dimensions, environmental, electrical, power) and a parts list for both standalone and backplane installation kits, as well as information on related documentation.