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The far-end office provides continuous quiet termination until released.
The near-end office measures noise on the trunk.
The test is terminated and the trunk is disconnected.
S100 test
In the S100 version, the steps involving the milliwatt test are eliminated.
TL102 tests over PRI
The 102 testline, also known as a milliwatt testline, provides far-to-near
transmission loss measurements.
Figure 10-2 shows a block diagram of the TL102 configuration.
Figure 10-2
TL102 configuration
TTT
A 9-second off-hook signal is sent from the far end, during which the
milliwatt test tone is applied. The milliwatt test tone is followed by an
on-hook signal, then quiet termination.
If the far end is a local office, the test tone is repeated in 10 second cycles (9
seconds on and 1 seconds off).
If the far end is a toll office, quiet termination continues until the near end
releases the connection, or requests another test cycle (by means of a
ring-forward signal). The milliwatt source-levels are office-dependent and
trunk-group-dependent.
ISDN PRI trunks do not support ring-forward.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
OG
Switch
trunk
network
under
1
test
Service verification 10-3
Switch
IC
network
trunk
2
Termi–
nating
102 test
line
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