Nortel DMS-100 Series Maintenance Manual page 89

The NT6X21AC line card appears in the first table. The NT6X21AD line card
appears in the second table.
Table 5 NT6X21AC THL Limits
Frequency
Minimum
Maximum
Table 6 NT6X21AD THL Limits
Frequency
Minimum
Maximum
Both limits are required so that the system software can determine what digital
to analog (D/A) gain is selected on the line card. The system compares THL
test results against the two possible limits.
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•
Refer to the following figure for a functional block diagram of the OPM LCA
shelves. This chapter contains descriptions of all the parts in this figure.
304 704
-6.2 -6.2
+1.3 +0.8
304 704
-2.7 -2.7
+4.8 +4.3
Data line card (DLC) (NT6X71AA, AB, AC). The data line card provides
data transmission interfaces for operation with computer terminals.
Integrated bit error rate test (IBERT) line card (NT6X99AA). The IBERT
line card provides bit error rate performance (BERP), through tests of
transmission paths. These tests assess bit error performance of OPM
hardware components.
DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up
Functional overview 2-13
1505 3204
-6.2 -7.2
+0.8 +0.7
1505 3204
-2.7 -3.7
+4.3 +4.2