User manual

Chapter 7. Test Menu

7-4 TDU 120e User Manual 61202156L1-1

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 a FT1 loopback using the inband

code described in T1.403.

No Loopback

Deactivates the loopback.

After a R

EMOTE

OOPBACK

option is selected, the TDU 120e

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 terminal dis-

plays the loopback progress by displaying Looping until

loopback is verified.

Test Pattern

All Ones

Sends an all ones pattern to the network.

All Zeros

Sends an all zeros pattern to the network.

Remote Loopback can only be used with Fractional T1 if the ANSI

FT1 LLB is selected.