3Com MSR 30, MSR 50 - page 125

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loopback
Syntax loopback { cell | local | payload | remote }
undo loopback
View ATM E3/T3 interface view
Parameter cell: Internal cell loopback, used to check whether the local end physical chipset is
working properly
local: Internal loopback, used to check whether the local service chip is working
properly.
payload: External payload loopback, used to check whether payload framing is
normal.
remote: External line loopback, used to check whether the remote end is working
properly.
Description Use the loopback command to configure the loopback mode on the ATM E3/T3
interface.
Use the undo loopback command to disable loopback.
By default, loopback is disabled.
Example # Enable external payload loopback on ATM E3/T3 interface 5/0.
<Sysname> system-view
[Sysname] interface atm 5/0
[Sysname-Atm5/0] loopback payload
scramble
Syntax scramble
undo scramble
View ATM E3/T3 interface view
Parameter None
Description Use the scramble command to enable payload scrambling on the ATM E3/T3
interface. This, however, does not affect cell headers.
Use the undo scramble command to disable payload scrambling.
By default, payload scrambling is enabled on an ATM E3/T3 interface.