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Digital telephones line engineering Page 297 of 504
Telephones and Consoles Description, Installation, and Operation
Figure 47
Engineer a telephone line (Part 7 of 8)
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Measure the DC loop
resistance.
(Procedure 8)
Install new cable.
Measure loop insertion
loss at 256 kHz.
Is the loop
resistance less
than 175 chm?
Is the insertion
loss less
than 12.0 dB?
Go to
Step 32
Go to
Step 32
NO
NO
YES
YES
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