Figure 3. Dds Trouble Codes; Figure 4. Ds0 Loopback At The Total Reach Dds-Dp - ADTRAN Total Access 1500 Total Reach DDS-DP Installation And Maintenance Manual

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Table Of Contents

Table of Contents

Total Access 1500 Total Reach DDS-DP Installation and Maintenance Guide

TR DDS-DP Trouble Code

The TR DDS‐DP system provides a quick diagnosis in the case of a circuit condition where

continuity is broken. The trouble code type received by a tester determines whether the open

condition is occurring on the local loop or at the customer premises. In the event of a 2‐wire

DSL loss of signal, loss of sync, or an open condition caused by an open conductor or discon‐

nected 2‐wire loop, the TR DDS‐DP transmits an alternating MOS (9Ah)/ASC (9Eh) trouble

code into the network as shown in Figure 3. During a similar Out‐of‐Service condition at the

customer premises, the Total Reach OCU‐R transmits an ASC (9Eh) upstream into the

network

TR DDS-DP Bidirectional Loopback Support

The TR DDS‐DP will execute a bidirectional loopback when performing a DS0 loopback at the

TR DDS‐DP as shown in Figure 4. During a bidirectional loopback the DDS‐R enables test

data to pass through the 4‐wire interface to the customer site. This allows a standard portable

test set at the customer site to verify the integrity of both the 4‐wire and 2‐wire loops by trans‐

mitting a test pattern to the TR DDS‐DP and examining the returning data for synchronization

and errors.

A bidirectional loopback and pass‐through is shown in Figure 5. During a bidirectional

loopback initiated at the TR DDS‐DP the DDS‐R CUST LBK LED will flash.

Channel Bank

Open 2-wire Loop

Alternating

MOS (9Ah)/

ASC (9Eh)

DDS-DP

Channel Bank

ASC 9Eh

DDS-DP