128 CHAPTER 4: ATM OC-3C/STM-1 INTERFACE CONFIGURATION COMMANDS
sonet: Sets the framing format to SONET OC-3, the optical carrier level three
(OC-3 of synchronous optical network (SONET).
Description Use the frame-format command to set the framing format for an ATM
OC-3c/STM-1 interface.
Use the undo frame-format command to restore the default, that is, SDH
STM-1.
Example # Set the framing format to SDH STM-1 on an ATM OC-3c/STM-1 interface.
<Sysname> system-view
[Sysname] interface atm 5/0
[Sysname-Atm5/0] frame-format sdh
loopback
Syntax loopback { cell | local | remote }
undo loopback
View ATM OC-3c interface view, STM-1 interface view
Parameter cell: Enables internal cell loopback.
local: Enables internal loopback.
remote: Enables external loopback.
Description Use the loopback command to configure the loopback mode on the ATM
OC-3c/STM-1 interface.
Use the undo loopback command to disable loopback.
By default, loopback is disabled.
Loopback is intended for test use. Disable it otherwise.
Example # Enable internal loopback on ATM interface 5/0.
<Sysname> system-view
[Sysname] interface atm 5/0
[Sysname-Atm5/0] loopback local
scramble
Syntax scramble
undo scramble