Quantcast Figure 4-91. Vf subscriber circuit loop-back, fault isolation flow chart (sheet 1 of 2)

 

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Figure 4-83. Noise burst on a local subscriber circuit, fault isolation flow chart (sheet 3 of 3)
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TM-11-5895-1012-10 Technical Control Facility (General) Manual
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Figure 4-92 . Vf subscriber circuit loop-back method, fault isolation flow chart (sheet 2 of 2)
TM 11-5895-1012-10
(15) After the fault has been cleared, remove any
patches which have been established and complete sta-
tion records in accordance with established proce-
dures.
c. Fault Isolation of a VF Subscriber Circuit by the
Loop-Back Method. This procedure followed is outlined
in flow-chart fashion in figure 4-9. The Technical
Controller is notified by a local subscriber that the cir-
send point of the same channel under test at the equal
cuit level is not correct. A spare channel is available
level patch panel.
and the circuit is patched over onto the spare circuit so
(3) The local Technical Controller inputs a 1
that the normal path can be available for out-of-service
Hz test tone on the send circuit at a level of 0 dBm at
testing. The basic procedure is to clear the local station
the equal level patch panel. The same test tone should
Vf subscriber circuit loop-back, fault isolation flow chart (sheet 1 of 2)

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