Zhone Technologies Network Device manual WAN Diagnostics, In-Band Loop back Code Generation, Qrss

Zhone Technologies, Inc. IMACS Product Book, Version 4

integral diagnostic capabilities of the IMACS include Bit Error Rate Testers (BERTs) on data cards, tone generators on analog voice cards, the ability to manipulate the analog leads and the digital signaling bits of voice circuits and extensive loop back generation and detection capability on many system elements.

The ability to initiate loop backs at various points in a circuit, coupled with the ability to generate and receive test signals and to collect performance and error information, enables the operator to systematically troubleshoot circuit problems. It allows the operator to determine if the problem resides in the IMACS system, and whether the problem can be isolated down to a specific Field Replaceable Unit (FRU) within the system. Since all of these diagnostic tools can be operated from a VT100 terminal, troubleshooting begins immediately without dispatching an on-site technician.

The diagnostic capabilities of the IMACS system are described in the following section. They are divided into four categories: (1) WAN diagnostics, (2) voice diagnostics, (3) data diagnostics and (4) cross-connect diagnostics.

WAN Diagnostics

Software-initiated diagnostics on T1 and E1 WAN aggregates include looping the WAN signal toward the network (line loop back) or the IMACS system (local loop back) and placing any one of the DS0 channels that make up the WAN signal in local loop back. See Table 25 for a complete list of diagnostic capabilities.

Table 25-- Diagnostic Capabilities of Single and Dual WAN Cards

On-Card Loop backs

LOOP BACKS	T1/CSU	T1/DSX	E1/CEPT/HDSL
T1/E1 Line Loop back Toward Network	Yes	Yes	Yes
T1/E1 Local Loop back Toward User	Yes	Yes	Yes
DS0 Channel Loop back Toward Network	No	No	No
DS0 Channel Loop back Toward User	Yes	Yes	Yes
In-Band Loop back Code Generation
LOOP BACKS	T1/CSU	T1/DSX	E1/CEPT/HDSL
Industry-Standard T1/E1 Loop-Up Code	Yes	Yes	N/A
Industry-Standard T1/E1 Loop-Down Code	Yes	Yes	N/A
In-Band Loop back Code Detection
LOOP BACKS	T1/CSU	T1/DSX	E1/CEPT/HDSL
Industry-Standard T1/E1 Loop-Up Code	Yes	Yes	N/A
Industry Standard T1/E1 Loop-Down Code	Yes	Yes	N/A
Bit Error Rate Tester (BERT)
Patterns Supported
LOOP BACKS	T1/CSU	T1/DSX	E1/CEPT/HDSL
All 1s	Yes	Yes	Yes
All 0s	Yes	Yes	Yes
1:1	Yes	Yes	Yes
1:7	Yes	Yes	Yes
3:24	Yes	Yes	Yes
QRSS	Yes	Yes	Yes
March 2001			Page 102