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Generally Accepted Criteria of
Plain Old Telephone Service (POTS) service
(US and Canada)
Parameter Acceptable Marginal Unacceptable
Current >23 20 to 23 <20 mA
Loss <8.5
— >8.5 dB
Balance >60 50 to 60 <50 dB
Noise
<20
<-70
20 to 30
-70 to -60
>30
>-60
dBrnC
dBmOp
Power
Influence
<80
<-10
80 to 90
-10 to 0
>90
>0
dBrnC
dBmOp
Ground
Resistance*
<25
— >25 Ohms
Insulation
Resistance
>3M 300K to 3M <300K Ohms
Longitudinal
Balance
>59 50 to 59 <50 dB
DSL Noise:
Noise Weighting Filters:
E Filter (ISDN/IDSL) 1 kHz to 50 kHz
F Filter (HDSL) 4.9 kHz to 245 kHz
G Filter (ADSL) 20 kHz to 1.1 MHz
Metallic (100/135
Ω)
E Filter (ISDN/IDSL) 10 to 90 dBm 2dB
F Filter (HDSL) 20 to 90 dBm 2dB
G Filter (ADSL) 30 to 90 dBm 2dB
Longitudinal
E Filter (ISDN/IDSL) 40 to 120 dBm 2dB
F Filter (HDSL) 50 to 120 dBm 2dB
G Filter (ADSL) 60 to 120 dBm 2dB
Spectrum Analyzer:
Frequency Range: 10 kHz to 1.8 Mz,
Frequency Spans: 120 kHz, 240 kHz,
465 kHz, 1 MHz, 2 MHz
Dynamic Range: -90 to +10 dBm
Frequency Resolution: 1% of span
Input Impedance: 100
Ω
* Note: Ground Resistance can not be measured on “floating tip” or “floating
A” switches such as the AT&T #5ESS.
Note: All specifications are based on information believed
to be reliable, but the accuracy or completeness thereof is
not guaranteed. Specifications for this product are subject to
change without notice.