ADTRAN TSU 120 Bedienungsanleitung PDF herunterladen (Seite 97)

Chapter 7. Test Menu

61202129L1-1 TSU 120 User Manual 7-5

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

OOPING

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 end-to-end integrity check can be run without the

need for any external test equipment. When QRSS is assigned

to TST DS0s, an integrity check of the link can be run along

with normal data flow. The TST DS0s are user-assigned as part

of the DS0 Map. This sets the pattern for the test and initiates

the transmission of the pattern. The test is terminated by select-

ing

ONE

. The following patterns are available:

LPBK

Initiates the transmission of a FT1

loopback using the inband code

described in T1.403.

LOOPBACK

Deactivates the loopback

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ADTRAN TSU 120 Bedienungsanleitung Seite 97