Cisco ASR 900 Series Configuration Guide

BERT
Bit-Error Rate Testing (BERT) is used for analyzing quality and for problem resolution of digital transmission
equipment. BERT tests the quality of an interface by directly comparing a pseudorandom or repetitive test
pattern with an identical locally generated test pattern.
The BERT operation is data-intensive. Regular data cannot flow on the path while the test is in progress. The
path is reported to be in alarm state when BERT is in progress and restored to a normal state after BERT has
been terminated.
The supported BERT patterns are 2^15, 2^20, 2^23, all 0s and all 1s.
BERT is supported in the following two directions:
• Line—Supports BERT in TDM direction.
• System—Supports BERT in PSN direction.
The following table shows the SONET level of BERT patterns supported.
PatternsModes
• 0s—Repeating pattern of zeros.
• 1s—Repeating pattern of ones.
• 2^15-O.151—Pseudo-random O.151 test pattern
that is 32,768 bits in length. Error and Jitter
measurement of 1544, 2048, 6312, 8448, 32064,
44736 kbps.
• 2^20-O.153—Pseudo-random O.153 test pattern
that is 1,048,575 bits in length.
• 2^20-O.151—Pseudo-random QRSS O.151 test
pattern that is 1,048,575 bits in length. Error
and Jitter measurement upto 72 kbps.
• 2^23-O.151—Pseudo-random 0.151 test pattern
that is 8,388,607 bits in length. Error and Jitter
measurement of 34368 kbps and 139264 kbps
SONET Path Level
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x (Cisco
ASR 900 Series)
25
Configuring SONET
BERT

Cisco ASR 900 Series Specifications

General

Brand	Cisco
Model	ASR 900 Series
Category	Network Router
Language	English