User guide

3-9
Configuration Guide for Cisco DSLAMs with NI-2
OL-2074-03
Chapter 3 Initially Configuring the Cisco DSLAM
Modifying the Physical Layer Configuration of the Default ATM Interface
Example
This example shows how to modify an OC-3 interface from the default settings to:
• Disable scrambling cell-payload.
• Disable scrambling STS-streaming.
• Change the SONET mode of operation from Synchronous Time Stamp level 3c (STS-3c) mode to
Synchronous Transfer Module level 1 (STM-1).
To change the configuration of an ATM interface, follow these steps:
Example
This example shows how to disable cell-payload scrambling and STS-stream scrambling and changes the
SONET mode of operation to Synchronous Digital Hierarchy/Synchronous Transfer Module 1 (SDH/STM-1)
of OC-3 physical interface 0/0:
DSLAM(config)# interface atm 0/1
DSLAM(config-if)# no scrambling cell-payload
DSLAM(config-if)# no scrambling sts-stream
DSLAM(config-if)# sonet stm-1
DSLAM(config-if)# exit
DSLAM(config)#
To display the physical interface configuration, use these privileged EXEC commands:
Example
In this example, the OC-3 physical interface configuration is displayed after you modify the defaults:
DSLAM# show interfaces atm 0/1
ATM0/1 is up, line protocol is up
Hardware is suni_dual
MTU 4470 bytes, sub MTU 4470, BW 155520 Kbit, DLY 100 usec,
reliability 250/255, txload 1/255, rxload 1/255
Encapsulation ATM, loopback not set
Last input 00:00:00, output 00:00:00, output hang never
Command Task
Step 1
DSLAM# configure terminal
Enter global configuration mode.
Step 2
DSLAM(config)# interface atm slot/port
Select the physical interface to be configured and enter interface
configuration mode.
Step 3
DSLAM(config-if)# no scrambling
cell-payload
Disable cell-payload scrambling.
Step 4
DSLAM(config-if)# no scrambling
sts-stream
Disable STS-stream scrambling.
Step 5
DSLAM(config-if)# sonet {stm-1 |
sts-3c}
Configure SONET mode as SDH/STM-1.
Step 6
DSLAM(config-if)# end
Return to privileged EXEC mode.
Step 7
DSLAM#
—
Command Task
DSLAM# show interfaces atm slot/port Show the physical layer configuration.
DSLAM# show running-config Show the physical layer configuration.