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Cisco Media Gateway Manager 5.0 User Guide
OL-5461-02
Chapter 9 Managing Faults
Is the Service Working?
Step 15 Verify the statistics name and statistics value for the real-time counters.
Step 16 Click Start Test Connection to proceed with testing.
Step 17 Click Abort Test Connection to stop the test.
9.4.16 Bit Error Rate Test
Bit Error Rate Test (BERT) verifies the integrity of a network element by measuring error statistics that
result from sending known bit patterns, analyzing a remote interface, and analyzing the pattern that is
returned. BERT is used on DS3, DS1, and DS0/DS0 bundle interfaces.
BERT generates a known data sequence into a transmission device, and examines the received sequence
at the same device or a remote device for errors. Tests are run on a full T1E1 line or a fractional T1E1,
for example, single DS0 or a group of DS0s. BERT tests the quality of links by directly comparing a
pseudo-random or repetitive test pattern with an identical, local-generated test pattern.
Note SRME, SRME/B, VXSM, VISM-PR, and AXSME card types support BERT.
BERT includes the following functions:
• Configures a local loopback on a line or port, or specifies a remote loopback be used instead.
• Defines the bit pattern.
• Specifies a duration for the BERT session after the session automatically terminates.
• Specifies BERT can start on a designated line or port.
• Lists BERT tests that are initiated from Cisco MGM.
• Refreshes the display to update the output for the current BERT.
• Stops a BERT started from Cisco MGM.
9.4.17 Configuring Bit Error Rate Test
You can setup BERT options on the looped back connection and use the available test patterns displayed
in the BERT Configuration window. Before you configure the BERT options in the BERT Configuration
window, make sure a line or port is selected from a BERT-supported service module.
In Cisco MGM, BERTs are only applicable on:
• AXSME 32 T1E1 (on DS1 Line)
• VXSM 48 T1E1 (on DS1 Line)
• VXSM OC3 (on DS1 Paths)
• VISM PR 8T1E1 (accompanied by an SRM Card, on DS1 Line)
This section also includes the following details:
• 9.4.17.1 Stopping Bit Error Rate Test
• 9.4.17.2 Modifying Bit Error Rate Test
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