Nortel Networks Option 11C 사용자 설명서
Page 318 of 544
M3900 telephone series
Environmental and safety considerations
Temperature and humidity
Line engineering
Meridian Digital telephones use twisted pair wiring on transmission lines
selected by the rules given in Digital Telephone Line Engineering (553-2201-
180). The maximum permissible loop length is 3500 ft. (1067 m), assuming
24 AWG (0.5 mm) standard twisted wire with no bridge taps. A 15.5 dB loss
at 256 kHz defines the loop length limit. (Longer lengths are possible,
depending on the wire’s gauge and insulation.).
selected by the rules given in Digital Telephone Line Engineering (553-2201-
180). The maximum permissible loop length is 3500 ft. (1067 m), assuming
24 AWG (0.5 mm) standard twisted wire with no bridge taps. A 15.5 dB loss
at 256 kHz defines the loop length limit. (Longer lengths are possible,
depending on the wire’s gauge and insulation.).
Note: Use only the line cord provided with the telephone. Using a cord
designed for another telephone could result in damage to the cord.
designed for another telephone could result in damage to the cord.
HEAD
SET
EXT.ATR*
OK
OK
OK
OK
OK
OK
OK
N/A
X
OK
X
HD SET
OK
OK
OK
OK
OK
OK
OK
X
N/A
OK
OK
GPIO
EXT.ATR
OK
OK
OK
OK
OK
OK
OK
OK
OK
N/A
OK
RCDR
OK
OK
OK
OK
OK
OK
OK
X
OK
OK
N/A
Operating state:
Temperature range
0° to 50°C (32° to 104°F)
Relative humidity
5% to 95% (noncondensing). At temperatures
above 34°C (93°F) relative humidity is limited
to 53 mbar of water vapor pressure.
above 34°C (93°F) relative humidity is limited
to 53 mbar of water vapor pressure.
Storage:
Temperature range
–50° to 70°C (–58° to 158°F)
Relative humidity
5% to 95% (noncondensing). At temperatures
above 34°C (93°F) relative humidity is limited
to 53 mbar of water vapor pressure.
above 34°C (93°F) relative humidity is limited
to 53 mbar of water vapor pressure.
Table 96
M3900 Series Meridian Digital Telephone accessory compatibility (Part 2 of 2)
M3900 Series Meridian Digital Telephone accessory compatibility (Part 2 of 2)
HW Port
SDI
SIDL +
USAR
T
USAR
T
UART
HEADSET
GPIO