143
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.
