ADC AVIDIA SWD4573I1 - Manual (Page 168)

Configuring OC3 Service
142 Avidia System Configuration and Management User Manual
C
ONFIGURING
OC3 S
ERVICE
You must configure each line card port to reflect whether the physical interface is SONET or
SDH. You configure the line card port from the
::optics=> prompt. From the ::root=>
prompt, type the following command then press to display the ::optics=> prompt.
configuration optics
Configuring the OC3 Interface Type
Each OC3 card has two SONET ports, designated as ports 1a and 1b. You must set the interface
type for each port separately. From the
::optics=> prompt, type the set command in the
following format then press .
set [-loopback (none|local|line)]
[-scrambling (enable|disable)]
Parameters
The line card port you want to configure (format slot.port, where port is either 1 or 2).
[-loopback (none|local|line)]
The type of loopback to start, if any. See “Initiating Communication Path Loopbacks” on
page 345 for information.
[-scrambling (enable|disable)]
Enables or disables cell scrambling. Cell scrambling, used in Avidia, is not an ATM
defined format for OC3, but is implemented by many vendors. An ATM cell has two parts:
header and payload. Cell scrambling scrambles the payload so that it does not resemble the
header. In the event that an ATM network looses sync, it will attempt to synchronize on
what it sees as the cell header. In some cases, the cell payload can resemble the cell header,
so the network attempts to synchronize on the cell payload rather than the cell header.
Scrambling the cell payload precludes it from looking like a cell header. Choose to enable
or disable cell scrambling based on whether or not the ATM equipment in the network
supports cell scrambling.
Example
::optics=> set 2.1 -scrambling enable
ENTER
ENTER