
Configuring WAN Line Services
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Entering FT1 Port Loopback Commands
Table 8-20
describes the loopback commands you can send on an FT1 port.
In payload loopback, the signal loops through the T1 framing device before the
received signal is looped back for retransmission. In line loopback, the signal does
not go through the framing device.
Note:
FDL loopback command options apply only when the FT1 line type is
configured as ESF for testing. For more information about FDL loopback
codes, see ANSI T1.408 ISDN Primary Rate - Customer Installation Metallic
Interfaces Layer 1 Specification.
Caution:
Wait for the window to update before selecting another command.
Table 8-20. Send Commands for FT1 Port Loopback
Send Command Function
Loop Up Sends a loop-up code to the remote end to initiate line
loopback. After a minimum of 4.5 seconds, the port loops
receive data back onto the T1 transmit path at the T1
interface. The line type setting determines the coding scheme.
Loop Down Sends a loop-down code to the remote end to stop the line
loopback condition
FDL Payload Loop Sends a loop-up code to the remote end to initiate payload
loopback
FDL Disable Payload Sends a loop-down code to the remote end to stop the
payload loopback
FDL Line Loop CI Sends a Customer Installation (CI) loopback message
FDL Line Loop IA Sends a CI loopback message, indicating that it originates
from the CSU
FDL Line Loop IB Sends a CI loopback message, indicating that it originates
from the DSU
FDL Disable Line Loop Disables generation of FDL line loopback codes
FDL Disable All Sends a universal loopback deactivate code to stop all
loopback activity
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