Alcatel-Lucent 7750 Configuration Manual page 493

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.
loopback
Syntax loopback {line | internal | remote}
no loopback
Context config>port>tdm>e3
config>port>tdm>ds3
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.
7750 SR Interface Configuration Guide
Interface Configuration
Page 493