Interface Configuration
7210 SAS M, T, X, R6, R12, Mxp, S, Sx Interface Configuration Guide Page 215
loopback
Syntax loopback {line | internal | fdl-ansi | fdl-bellcore | payload-ansi}
no loopback
Context config>port>tdm>ds1
config>port>tdm>e1
Note: Only line and internal options are supported for "e1".
Description Platforms Supported: 7210 SAS-M.
This command puts the specified port or channel 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. 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 from the local router back to the framer. This is usually referred to as
an equipment loopback. The Tx signal is looped back and received by the interface.
Note: The loopback command is not saved to the system configuration.
The no form of this command disables the specified type of loopback.
Note: The fdl-ansi, fdl-bellcore and payload-ansi options can only be configured if DS1 framing is set to
ESF.
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.
mode
Syntax mode {access}
no mode
Context config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
Description Platforms Supported: 7210 SAS-M.
This command configures a TDM channel for access mode operation. An access port or channel is used for
customer-facing traffic on which services are configured. A Service Access Point (SAP) can only be
configured on an access port or channel. When a port is configured for access mode, the encap-type cem
must be specified to distinguish the services on the port.
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