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Chapter 3. Operation
61200.076L2-1 TSU 600 User Manual 79
REMOTE LOOPBCK
This activates the same loopbacks as Local Loopback
but at the far end. It uses either the inband loop-up
code as specified by ANSI T1.403 for line loopback
(ATT In-Band LLB), or the FDL as specified in ANSI
T1.403 for payload and line loopback codes. The
following options are available:
ATT In-Band LLB Activates the line loopback
using inband code
ANSI FDL PLB Initiates the transmission of
an FDL payload loop-up code
toward the far end
ANSI FDL LLB Initiates the transmission of
an FDL line loop-up code
toward the far end
No Loopback Deactivates the loopback
Remote Loopback cannot be used with Fractional T1 since
the full T1 stream including the FDL is not transported to
the far end.
After a Remote Loopback option is selected, the
TSU 600 verifies that the far end is actually in a
loopback by checking for the receipt of a code looped
back from the far end. Once the Remote Loopback
type is selected, the LCD displays the loopback
progress by displaying Looping until loopback is
verified.