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Digital telephones line engineering Page 303 of 504
Telephones and Consoles Description, Installation, and Operation
Figure 48
Maximum allowable impulse noise counts versus loop loss
0 5 10 15
10
100
Loss in dB
Maximum allowable impulse
noise counts per 15 minutes
1000
10000
Note:
Impulse noise counter weighting is 100 kHz.
Termination is 135 ohms.
553-AAA0658
40 dBrn
44 dBrn
46 dBrn
48 dBrn
52 dBrn