Setup guide

4-9
Cisco 6400 Software Setup Guide
OL-1183-04
Chapter4 Node Line Card Interface Configuration
OC-3 NLC and OC-12 NLC Interface Options
• STS-12c—Synchronous Transport Signal level 12, concatenated (12 x 51.84 Mbps). SONET format
that specifies the frame structure for the 5184-Mbps lines used to carry ATM cells. (Default for
OC-12 NLC.)
The OC-3 NLC and OC-12 NLC support the following scrambling modes, both turned on by default:
• STS-stream—Scrambles the SONET/SDH Layer 1 stream
• Cell-payload—Scrambles only the payload of the cell (not the header)
Configuring the OC-3 and OC-12 Interface Options
To configure framing and scrambling on the OC-3 NLC and OC-12 NLC, complete the following steps
beginning in global configuration mode:
Example
In the following example, both cell-payload scrambling and STS-stream scrambling are disabled for the
OC-3 interface ATM 1/0/0. Also, the SONET mode of operation is set to SDH/STM-1.
!
interface atm 1/0/0
no scrambling cell-payload
no scrambling sts-stream
sonet sts-3c
!
Verifying the OC-3 and OC-12 Interface Configuration
To verify successful configuration of OC-3 or OC-12 interfaces, use the show controller atm EXEC
command. Check that the output displays the correct interface options.
Switch# show controller atm 7/0/0
Redundancy NOT Enabled on interface
IF Name: ATM7/0/0 Chip Base Address(es): A8B08000, 0 Port type: OC3 Port rate: 155
Mbps Port medium: SM Fiber
Port status:Good Signal Loopback:None Flags:8308
TX Led: Traffic Pattern RX Led: Traffic Pattern TX clock source: network-derived
Framing mode: sts-3c
Cell payload scrambling on
Sts-stream scrambling on
...
Command Purpose
Step1
Switch(config)# interface atm slot/subslot/port
Specifies an OC-3 or OC-12 ATM
interface and enters interface
configuration mode.
Step2
Switch(config-if)# sonet {stm-1 | sts-3c | stm-4 | sts-12c}
Configures the SONET framing mode.
Step3
Switch(config-if)# [no] scrambling {cell-payload | sts-stream}
Enables or disables the scrambling
modes.