DECrepeater 350

This document is a service guide for the DECrepeater 350 (DETPR), also known as the Digital Ethernet twisted-pair multiport repeater. It provides a functional overview, configuration guidelines, troubleshooting information, and detailed specifications for the device.

The DECrepeater 350 is an AC-powered signal repeater designed to connect up to eight node devices to a standard Ethernet backbone network using twisted-pair cables. It features eight twisted-pair ports (8-pin modular jack connectors) and one Attachment Unit Interface (AUI) port (15-pin D-subminiature connector) for connecting to transceivers or MAUs. The DETPR functions by treating all ports as a common data bus, restoring signal amplitude and timing, buffering received data, and enforcing collisions across all ports. It regenerates the 64-bit preamble for all repeated packets.

The guide outlines configuration rules, including limitations on the number of repeaters in a multisegment Twisted-Pair Ethernet, station equipment connection guidelines, and specific rules for DELNI/DETPR pyramids. It emphasizes the DETPR's active repeater nature and its incompatibility with passive twisted-pair Ethernet implementations. Twisted-pair wire guidelines specify link length (max 100m), cable types, impedance, and environmental constraints (e.g., no shared sheath with telephone service, separation from noise sources).

Troubleshooting information includes diagnostic procedures such as internal power-up tests, external self-tests, and specific tests for station equipment, Ethernet connections, and crossover scenarios. It provides detailed tables for interpreting control panel LED indicators to identify and resolve various faults, including cable faults, and outlines steps for isolating problems within the DETPR, cabling, or station equipment.

Finally, the document includes comprehensive specifications covering physical dimensions for different models, electrical requirements (AC/DC power), environmental conditions (temperature, altitude, humidity), part numbers for accessories and cables, detailed twisted-pair cable requirements, and connector pinouts for both the 8-pin MJ and 15-pin D ports.