Configuring BERT in Mode VC-1x
To configure BERT in mode VC-1x for both AUG mapping AU-3 and AU-4:
configure terminal
controller sdh 0/4/7
rate STM1
no ais-shut
alarm-report all
clock source internal
overhead s1s0 0
aug mapping au-4
au-4 1
mode tug-3
clock source internal
tug-3 1
mode vc-1x
tug-2 1 payload VC11
t3 bert pattern 2^15 internal 10 direction [line | system]
Verifying BERT Configuration in Mode VC-1x
Use show controllers command to verify BERT configuration in mode VC-1x:
#show controller sdh 0/4/7 | sec BERT
BERT test result (running)Test Pattern : 2^15,
Status : Sync, Sync Detected : 0Interval : 10 minute(s),
Time Remain : 00:09:47Bit Errors (since BERT started): 0 Mbits,Bits Received (since BERT
started): 0 Mbits
Bit Errors (since last sync): 1943 bits
Bits Received (since last sync): 1943 Kbits
Direction : Line
Configuring BERT in SDH for CESoPSN
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 2^11, 2^15, 2^20-O153, and 2^20-QRSS.
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 SDH level of BERT patterns supported.
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)
99
Configuring SDH on 1-Port OC-192/STM-64 or 8-Port OC-3/12/48/STM-1/-4/-16 Module
Configuring BERT in Mode VC-1x
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