Nortel Meridian 1 Manual page 43

Environmental specifications
Signalling
Intelligent peripheral equipment circuit cards for New Zealand
Note 1: Analog circuitry is powered with +/- 12V generated from
+/- 15V. The maximum current imbalance between the +/- 15V rails is
100 ma per circuit pack.
Note 2: 8.5V is regulated to give 5V.
Note 3: This figure reflects 10 ma for ringing one telephone per unit.
There may be more than one telephone or ringer on a unit.
Table 28 lists the environmental specifications of the Flexible Analog line
card.
Table 28
NT5K02 Flexible Analog line card environmental specifications
Parameter
Operating temperature
Operating humidity
Storage temperature
Loop operation
The Flexible Analog Line Card is loop start, with a loop limit of 1000 Ω at
-48 V excluding the telephone set. The minimum values of current and
voltage at the telephone set are 25 ma and 10V respectively.
Table 29 lists the number of telephone sets that can be supported by the loop.
Table 29
Loop limits
Loop resistance including telephone
sets
350 Ω or less
Over 350 Ω to a maximum of 1800 Ω
Flexible analog line circuit card
Specifications
0 to 45 degrees C, ambient
5 to 95 % Relative Humidity
- 40 to + 70 degrees C
Number of telephone sets
2
1
Option 11 - Description and Instal-
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