
| Chapter 7. Test Menu |
FT1 LPBK | Initiates the transmission of a 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.
After a Remote Loopback option is selected, the TSU 120 veri- fies 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 loop- back progress by displaying LOOPING until loopback is verified.
Test Patterns
All Zeros
Sends an all zeros pattern to the network.
All Ones
Sends an all ones pattern to the network.
QRSS Pattern
The QRSS pattern is commonly used to simulate real data in T1 interfaces. This pattern can be assigned to appear in all DS0s or only in TST DS0s. When QRSS is set in all DS0s and one of the network loopbacks previously described is activated at the far end, a total
TSU 120 User Manual |