Cisco Cisco IOS Software Release 12.0(21)S1

router#show controller provision 5

Slot 5 :CH-OC48-X, GULF Revision:4, Dynamic Provisioning:disabled 

'microcode reload' required:No

         Interface POS5/0:1 :    activated

         Interface Serial5/0.2:1 :    activated

         Interface Serial5/0.2:2 :    activated

         Interface Serial5/0.2:3 :    activated

Interface POS5/0:5 :    activated

Interface Serial5/0.9:1 :    activated

         Interface Serial5/0.9:2 :    activated

         Interface Serial5/0.9:3 :    activated

router # configure terminal

router(config)# interface pos 5/0:1

router(config-if)# ip address 10.0.1.1 255.255.255.0

router(config-if)# no shutdown

router(config)# interface pos 5/0:5

router(config-if)# ip address 10.0.5.1 255.255.255.0

router(config-if)# no shutdown

router(config-if)# interface pos 5/0.2:1

router(config-if)# ip address 10.0.21.1 255.255.255.0

router(config-if)# no shutdown

router(config-if)# interface pos 5/0.2:2

router(config-if)# ip address 10.0.22.1 255.255.255.0

router(config-if)# no shutdown

router(config-if)# interface serial 5/0.2:3

router(config-if)# ip address 10.0.23.1  255.255.255.0

router(config-if)# no shutdown

router(config-if)# interface serial 5/0.9:1

router(config-if)# ip address 10.0.91.1 255.255.255.0

router(config-if)# no shutdown

router(config-if)# interface serial 5/0.9:2

router(config-if)# ip address 10.0.92.1 255.255.255.0

router(config-if)# no shutdown

router(config-if)# interface serial 5/0.9:3

router(config-if)# ip address 10.0.93.1 255.255.255.0

router(config-if)# no shutdown

router(config-if)# exit

router#

Bit error rate test (BERT) circuitry is built into the 1-Port Channelized OC-48/STM-16 ISE and 4-Port 
Channelized OC-12/STM-4 ISE line cards. There is one pseudorandom binary sequence generator every 
16 channels. For each group of 16 channels, BER testing can be run on only one interface at a time.

You can set one local DS3/E3 serial port to BERT mode while the remaining local serial ports continue 
to transmit and receive normal traffic. A BER test checks communication between the local and the 
remote DS3/E3 ports. 

If traffic is not being transmitted or received, create a back-to-back loopback BER test and send out a 
predictable stream to ensure that you receive the same data that was transmitted. 

To determine if the remote DS3/E3 serial port returns the BERT pattern unchanged, the system 
administrator for the remote router must manually enable network loopback at the remote DS3/E3 serial 
port, while you enter a bert pattern interface configuration command for specified time intervals on the 
local DS3/E3 serial port. 

With BER tests, you can accurately assess the number of errors on a DS3/E3 link and diagnose signal 
problems in the field.