Juniper JUNOSE 11.2.X PHYSICAL LAYER Configuration Manual page 164

JunosE 11.2.x Physical Layer Configuration Guide
loopback
path ds1|e1 loopback
142
SONET/SDH section layer
T1/E1 over SONET/SDH VT layer
T3 layer
T1/E1 over T3 layer
See "Interface Stack" on page 108 for a description of the layers.
To enable local or network loopback:
Select a controller.
1.
Configure local or network loopback at the desired layers in the interface.
2.
Use to configure the type of loopback at the SONET/SDH section layer.
Specify one of the following options:
local—Loops the data back toward the router; on supported line modules, also sends
an alarm indication signal (AIS) out toward the network.
network—Loops the data toward the network before the data reaches the frame.
Example
host1(config)#controller sonet 4/0
host1(config-controller)#loopback network
Use the no version to disable loopback.
See loopback.
Use to configure a loopback at the T1/E1 over SONET/SDH VT layer.
Specify one of the following options:
local—Loops the router output data back toward the router at the T1/E1 framer; on
supported line modules, also sends an alarm indication signal (AIS) out toward the
network.
network { line | payload }
Specify the line keyword to loop the data back toward the network before the
T1/E1 framer and automatically set a local loopback at the HDLC controllers.
Specify the payload keyword to loop the payload data back toward the network
at the T1/E1 framer and automatically set a local loopback at the HDLC controllers.
Example
host1(config-controll)#path 12 ds1 1/3/4 loopback network line
Use the no version to clear the local loopback configuration.
See path ds1|e1 loopback.
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