- Nortel Telephones and Consoles Description, Installation, and Operation

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