Hardware manual

loopback (E3/T3 interface)
Interface Commands IR-137
loopback (E3/T3 interface)
To loop the serial interface on a PA-E3 or a PA-T3 port adapter, use the loopback interface
configuration command. To remove the loopback, use the no form of this command.
loopback {dte | local | network {line | payload}} (PA-E3)
loopback {dte | local | network {line | payload} | remote} (PA-T3)
no loopback
Syntax Description
Default
Disabled
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
Use this command for troubleshooting purposes.
To verify that a loopback is configured on the interface, use the show interface serial or show
interfaces loopback EXEC command.
Example
The following example configures the serial interface located in slot 3/0/0 for a local loopback:
interface serial 3/0/0
loopback local
Related Commands
You can use the master indexes or search online to find documentation of related commands.
show controllers serial
dte Sets the loopback after the LIU toward the terminal.
local Sets the loopback after going through the framer toward the
terminal.
network {line | payload} Sets the loopback toward the network before going through the
framer (line) or after going through the framer (payload).
remote Sends a far-end alarm control (FEAC) to set the remote framer
in loopback.