Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 471
Parameters line — places the associated port or channel into line loopback mode
internal — places the associated port or channel into internal loopback mode
fdl-ansi — requests an FDL line loopback in accordance with the ANSI T1.403
specification
fdl-bellcore — requests an FDL line loopback in accordance with the Bellcore TR-TSY-
000312 specification
payload-ansi — requests a payload loopback using ANSI signaling
loopback (E1)
Syntax loopback {line | internal}
no loopback
Context config>port>tdm>e1
Description This command puts the specified port or channel in 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. The bit stream is not reframed. The
electrical signal is regenerated by the Tx line interface unit (LIU) and the timing is provided
by the Rx LIU.
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.
The Tx signal is looped back and received by the interface. The loopback command is not
saved to the system configuration.
The no form of this command disables the specified type of loopback.
Default no loopback
Parameters line — places the associated port or channel into line loopback mode
internal — places the associated port or channel into internal loopback mode
remote-loop-respond
Syntax [no] remote-loop-respond
Context config>port>tdm>ds1
Description This command configures the DS1 channel response to remote loopbacks. When enabled,
the channel responds to remote loopbacks; when disabled, the channel does not respond.
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