Demand test descriptions and error codes - Avaya Support
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Table 456: Near-End External Loopback Test (#799) 2 of 2<br />

Error<br />

Code<br />

Test<br />

Result<br />

Description / Recommendation<br />

Automatic Transmission Test (#844-848)<br />

Automatic Transmission Test (#844-848)<br />

FAIL Near-end external loopback failed. A problem exists in the path of the<br />

loopback.<br />

1. Enter display <strong>error</strong>s <strong>and</strong> follow the associated repair<br />

procedures for any on-board DS1C-BD (DS1 Converter Circuit<br />

Pack) <strong>error</strong>s.<br />

2. If the loopback point is LB 1, replace connectors <strong>and</strong> cables<br />

between the DS1 converter A <strong>and</strong> the CSU A. If the loopback point<br />

is LB 2, replace CSU A. Also, see the repair procedure for Error<br />

Type 1025 (loss of frame alignment) for DS1C-BD (DS1 Converter<br />

Circuit Pack).<br />

3. If the <strong>test</strong> still fails, replace DS1 converter A circuit pack.<br />

Any PASS Transmission through the path of the loopback is successful. TN1654<br />

DS1 facilities will display the round trip delay time in milliseconds in the<br />

Error Code field. The round trip delay time is defined as the length of<br />

time in milliseconds it takes for the firmware to receive the <strong>test</strong> pattern<br />

after it has been sent. This measurement is taken on the last DS1 chel<br />

<strong>test</strong>ed.<br />

2 of 2<br />

Note:<br />

Note: Tests #844–848 are not supported on an International switch.<br />

These <strong>test</strong>s are run by the Automatic Transmission Measurement System (ATMS). They are not<br />

part of the long or short trunk <strong>test</strong> sequences. Instead, they are run using the comm<strong>and</strong><br />

<strong>test</strong> analog-<strong>test</strong>call or as part of ATMS scheduled <strong>test</strong>ing. For more information, see<br />

Maintenance Procedures for <strong>Avaya</strong> Aura Communication Manager, Media Gateways <strong>and</strong><br />

Servers (03-300432).<br />

The <strong>test</strong> call is run from an analog port on a TN771 Maintenance/Test circuit pack. It attempts to<br />

seize a port <strong>and</strong> make a call to a terminating <strong>test</strong> line (TTL) on the trunk’s far end. Transmission<br />

performance measurements are made <strong>and</strong> compared to administered thresholds. Errors are<br />

generated when results fall outside of “marginal” or “unacceptable” thresholds. Detail <strong>and</strong><br />

summary measurement reports are obtainable using list <strong>test</strong>calls.<br />

Issue 5 May 2009 1519

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