Specifying Linecoding - Cisco 10000 Series Configuration Manual

Controller Configuration Commands

Specifying Linecoding

You specify line coding to establish how physical data appears on the interface line using one of the
following formats:
T1 formats:
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E1 formats:
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These line coding formats ensure that line synchronization is maintained.
Specifying E1 Linecoding
Linecode format HDB3 ensures that the E1 receiver remains synchronized in the presence of consecutive
0 bits in received data. In E1 mode, the line card supports HDB3 line encoding only:
[no] linecode hdb3
Where hdb3 specifies the high-density bipolar 3 linecode in which every other 1 bit is of the opposite
polarity and bipolar violations are used to automatically maintain proper 1s density.
The no form of this command sets the E1 default linecode to hdb3.
Example:
Router# configure terminal
Enter configuration commands, one per line. End with CNTRL/Z.
Router(config)# controller e1 1/0/0
Router(config-controller)# framing hdb3
Router(config-controller)#
Specifying T1 Linecoding
You can specify either AMI or B8ZS line coding for T1 interfaces. In T1 mode, use the following
linecode command:
[no] linecode {ami | b8zs}
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Example:
Router# configure terminal
Enter configuration commands, one per line. End with CNTRL/Z.
Router(config)# controller t1 1/0/0
Router(config-controller)# linecode ami
Router(config-controller)#
Cisco 10000 Series Router Line Card Configuaration Guide
5-26
AMI (Alternate Mark Inversion)
B8ZS (Binary 8 Zero Substitution)
HDB3 (High Density Bipolar 3)
ami——specifies alternate mark inversion coding in which every other 1s bit is of the opposite
polarity. If two consecutive bits have the same polarity, a bipolar violation occurs.
b8zs——specifies binary 8 zero substitution in which each group of 8 consecutive zeros is replaced
with a bipolar violation to maintain synchronization.
Chapter 5 24-Port Channelized E1/T1 Line Card Configuration
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