3Com 3031 Command Reference Manual page 212

212 C 3: I M C
HAPTER NTERFACE ANAGEMENT OMMANDS
View
ATM interface view
Parameter
cell: Enables the ATM interface to perform cell loopback.
local: Enables the ATM interface to perform local loopback.
remote: Enables the ATM interface to perform the remote loopback.
Description
Using the loopback command, you can enable the loopback function on an ATM
OC-3c/STM-1 interface. Using the undo loopback command, you can disable the
loopback function.
By default, loopback function is disabled.
It is necessary for you to enable the interface to perform loopback only for the
purpose of testing some special functions. You should not enable the loopback
function when the interface is providing normal services.
Example
Enable the ATM interface to perform local loopback.
[3com-Atm4/0/0] loopback local
scramble
Syntax
scramble
undo scramble
View
ATM interface view
Parameter
None
Description
Using the scramble command, you can enable an undo scramble to scramble the
payload on ATM OC-3c/STM-1 interface. Using the undo scramble command, you
can disable the scrambling function.
By default, the ATM OC-3c/STM-1 interface is enabled to scramble the payload.
Executing the scramble command will make an interface to scramble and
descramble the payload but will not affect the cell headers.