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Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 102
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