Configuring Packet Over Sonet Spe Scrambling - Cisco 10000 Series Configuration Manual

Configuration Commands
pos flag s1-byte rx-communicate
no pos flag s1-byte rx-communicate
The following example directs the router to switch to internal clocking when it receives an S1 SONET
overhead byte with a value of 0xF:
pos flag s1-byte rx-communicate
The default for the pos flag s1-byte rx-communicate command is disabled or off.

Configuring Packet over SONET SPE Scrambling

You can use the pos scramble-atm command to scramble the Packet over SONET synchronous payload
envelope (SPE). SONET payload scrambling applies a self-synchronous scrambler to the SPE of the
interface to ensure sufficient bit transition density.
pos scramble-atm
[no] pos scramble-atm
The default is no Packet over SONET SPE scrambling.
Use the no form of the command to disable scrambling.
In the following example, scrambling is enabled:
Router(config)# interface pos 3/0/3
Router(config-if)# pos scramble-atm
Configuring Loopback Testing
To enable loopback testing of data transmitted from the PRE line card to the 6-Port OC-3/STM-1 Packet
over SONET line card and back, use the loopback command in interface configuration mode.
loopback [line | internal]
[no] loopback [line | internal]
Where:
•
•
Use the no form of the command to stop the loopback test.
For more information on loopbacks, refer to the online
Troubleshooting
In the following example, a loopback is set for the 6-Port OC-3/STM-1 Packet over SONET line card in
slot 5:
Router(config)# interface pos 5/0/0
Router(config-if)# loopback line
Cisco 10000 Series Router Line Card Configuaration Guide
12-6
loopback line loops any data received at the 6-Port OC-3/STM-1 Packet over SONET line card
network interface back into the network
loopback internal loops any data sent out the 6-Port OC-3/STM-1 Packet over SONET line card
back into the 6-Port OC-3/STM-1 Packet over SONET line card
Guide.
Chapter 12 6-Port OC-3/STM-1 Packet over SONET Line Card Configuration
Cisco 10000 Series Internet Router
OL-8834-04