Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 487
loopback
Syntax loopback {line | internal | remote}
no loopback
Context config>port>tdm>ds3
config>port>tdm>e3
Description This command puts the specified DS3/E3 port into a loopback mode.
A line loopback loops frames received on the corresponding port or channel back towards the
transmit (egress) direction before reaching the framer.
An internal loopback loops the frames that are coming in an egress direction from the fabric
towards the framer, back to the fabric. This is usually referred to as an equipment loopback.
A remote loopback sends a signal to the remote device to provide a line loopback. To
configure a remote loopback, you must enable feac-loop-respond on the far-end DS3/E3
interface, then set the loopback to remote on the near-end DS3/E3 interface. Remote
loopback sends a loopback code to the far-end DS3/E3 interface that results in the far end
sending out a line loopback.
The loopback command is not saved to the system configuration.
The no form of this command disables loopback on the DS3/E3 port.
Default no loopback
Parameters line — places the associated DS3/E3 port into line loopback mode
internal — places the associated DS3/E3 port into internal loopback mode
remote — places the associated DS3/E3 port into remote loopback mode
mdl
Syntax mdl {eic | lic | fic | unit | pfi | port | gen} mdl-string
no mdl
Context config>port>tdm>ds3
Description This command configures the maintenance data link (MDL) message for a DS3 port or
channel. This command is only applicable if the DS3 port or channel is using C-bit framing,
specified using the framing (DS3) command.
The no form of this command removes the mdl-string association and stops the transmission
of MDL messages.
Default no mdl
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