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Page 292 of 504 Digital telephones line engineering
553-3001-367 Standard 3.00 August 2005
Figure 47
Engineer a telephone line (Part 2 of 8)
553-AAA2054
Calculate the loop
resistance.
(Procedure 3)
Repair the probelm.
Is the PBX
at the
central
office?
Does the loop
pass the loop
diagnostic test?
(Procedure 4)
Is the loop
lenght less
than 2.1 kft?
Is there any
26 AWG cable
in the loop?
Is the resistance
less than
175 ohm?
Go to
Step 15
Go to
Step 12
Go to
Step 12
Go to
Step 1
Go to
Step 9
Step 9
YES
YES
YES
NO
YES
YES
NO
NO
NO
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