user manual

Cisco IOS Software Configuration for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Cisco IOS Release 12.0(8)S

Entering Errors in BER Tests

To insert intentional errors into the BER test stream, use the following command syntax:

bert errors [no-of-errors], where the no-of-errors default is 1 and the range is 1 to 255, inclusive. The

following example shows the command used to insert five errors into the current BER test stream that is

running the pseudorandom pattern 2^23 that repeats on the first DS3 channel for 10 minutes:

Router# configure terminal

Router(config)# interface serial 1/0:1

Router(config-if)# bert pattern 2^23 interval 10

Router(config-if)# bert errors 5

Router(config-if)# end

Router(config)# end

Router#

Using show Commands to Verify BERT Configuration

When the DS3 serial port is running a BERT, the serial port state is down, and only BERT data is passed.

You can use the show commands shown in Table 7 to verify if the line card state is up or down.

The following output indicates that BERT is enabled with a pattern of 2^23 and an interval of 10 minutes:

Router# show controller oc12 1/0:1 bert

Interface Serial1/0 (DS3 port 1)

BERT information:

State :enabled (sync'd)

Pattern :2^23

Interval :10 minutes

Time remaining :00:09:44

Total errors :0

Time this sync :00:00:10

Errors this sync :0

Sync count :1

Router#

Note The bit error test patterns from the serial ports on a 1-port channelized OC-12/STM-4

(DS3) line card are framed test patterns; therefore, they are inserted into the payload of a

framed T3 signal.

Table 7 Show Commands for BERT Configuration

Commands Explanation

show controller oc12 n/port:channel Shows the current controller status, where n is the slot

number.

show controller oc12 1/0:1 bert Shows the fields of a BER test that is still in progress.