Longitudinal Balance; Crosstalk - Nortel Meridian 1 Succession 1000 Manual

Longitudinal balance

Longitudinal balance (longitudinal to metallic), as shown in Table 63, defines
the amount of metallic noise voltage (conductor to conductor) resulting from
longitudinal voltage (conductor to ground) at the circuit input. The equation
for calculating longitudinal-to-metallic balance is as follows:
longitudinal balance (dB) = 20 log [Vs/Vm]
Note: Vs is the disturbing longitudinal voltage, and Vm is the resulting
metallic voltage of the same frequency. Ideally, the metallic noise
voltage is negligible and the longitudinal balance approaches infinity.
All measurements are at the PBX tip and ring.
Table 63
Longitudinal balance—µ-Law
Frequency (Hz)
200
500
1000
3000

Crosstalk

Crosstalk is the presence of unwanted voice signals coupled from one voice
channel to another. Crosstalk is not only an annoyance to the listener but also
is perceived as a violation of privacy. The crosstalk coupling attenuation for
every combination of through connections in all interface categories,
measured with input signals from 200 to 3200þHz at 0 dBm0, are listed in
Table 64.
Transmission characteristics—µ-Law
Minimum balance (dB)
58
58
58
53
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Average balance (dB)
63
63
63
58
Transmission Parameters