Alcatel-Lucent 7710 SR Configuration Manual page 322

TDM Commands
invert-data
Syntax [no] invert-data
Context config>port>tdm>ds1
config>port>tdm>e1
Description
This command causes all data bits to be inverted, to guarantee ones density. Typically used with AMI line
encoding.
Default
no invert-data
loopback
Syntax loopback {line | internal | fdl-ansi | fdl-bellcore | payload-ansi | inband-ansi | inband-
bellcore}
no loopback
Context config>port>tdm>ds1
config>port>tdm>e1
Description
This command puts the specified port or channel into a loopback mode.
The corresponding port or channel must be in a shutdown state in order for the loopback mode to be enabled.
The upper level port or channel or parallel channels should not be affected by the loopback mode.
NOTE: This command is not saved in the router configuration between boots.
The no form of this command disables the specified type of loopback.
Default
no loopback
Parameters
line — Places the associated port or channel into a line loopback mode. A line loopback loops frames
received on the corresponding port or channels back to the remote router.
internal — Places the associated port or channel into a internal loopback mode. A internal loopback loops
the frames from the local router back at the framer.
fdl-ansi — Requests FDL line loopback according to ANSI T1.403.
fdl-bellcore — Requests FDL line loopback according to Bellcore TR-TSY-000312.
payload-ansi — Requests payload loopback using ANSI signaling.
inband-ansi — Requests inband line loopback according to ANSI T1.403.
inband-bellcore — Requests inband line loopback according to Bellcore signaling.
Page 296 7710 SR OS Interface Configuration Guide