20-16
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 20 Troubleshooting the Serial SPAs
Using Bit Error Rate Tests
Table 20-8 provides information about some additiona BERT patterns supported by some of the
channelized SPAs on the Cisco ASR 1000 Series Routers:
Both the total number of error bits received and the total number of bits received are available for
analysis. You can set the testing period from 1 minute to 14,400 minutes (240 hours), and you can also
retrieve the error statistics anytime during the BER test.
When running a BER test, your system expects to receive the same pattern that it is transmitting. To help
ensure this:
• Use a loopback at a location of your choice in the link or network. To see how to configure a
loopback, go to the
“Using loopback Commands” section on page 20-18.
• Configure remote testing equipment to transmit the same BER test pattern at the same time.
Configuring a BER Test
To send a BER test pattern on an interface, use the bert pattern command. For more information, see
Chapter 19, “Configuring the 1-Port Channelized OC-3/STM-1 SPA and 1-Port Channelized
OC-12/STM-4 SPA.”
Viewing a BER Test
You can view the results of a BER test with the show controllers command.
You can view the results of a BER test at the following times:
• After you terminate the test using the no bert command.
• After the test runs completely.
• Anytime during the test (in real time).
Ta b l e 20-8 Additional BERT Pattern Support on the Channelized SPAs
Pattern
1-Port Channelized
OC-3/STM-1 SPA
1-Port Channelized
OC-12/STM-4 SPA
2-Port and 4-Port Channelized T3
SPA
1-in-8 Yes Yes Yes
3-in-24 Yes Yes Ye s
2^9 Yes Yes Yes
2^11 Yes Yes Yes
2^15-inverted Yes Yes Ye s
2^20-QRSS Yes Yes Ye s
2^23-inverted Yes Yes Ye s
55Octet Yes No Yes
55Daly Yes No Yes
DS0-1, DS0-2, DS0-3, and
DS0-4
Yes No Yes
Single Bit Error Injection No Yes No
To Next Page
Loading...
Need help?
General
