Chapter 7. Test Menu

No Loopback

Deactivates the loopback. Scroll to select a setting and press Enter to record the setting.

Remote Loopback

Activates the same loopbacks as LOCAL LOOPBACK, but at the far end.

Uses either the inband loopup 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 loopup code toward the far end.

ANSI FDL LLB

Initiates the transmission of an FDL line loopup code toward the far end.

ANSI FT1 LLB

Initiates the transmission of an FT1 loopback using the inband code described in T1.403.

No Loopback

Deactivates the loopback.

Remote Loopback can only be used with Fractional T1 if the ANSI FT1 LLB is selected.

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TDU 120e User Manual

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ADTRAN TDU 120e user manual Ansi FDL PLB, Ansi FDL LLB, Ansi FT1 LLB