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Page 318 of 544 M3900 telephone series
553-3011-100 Standard 14.00 January 2002
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.).
Note: Use only the line cord provided with the telephone. Using a 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.
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.
Table 96
M3900 Series Meridian Digital Telephone accessory compatibility (Part 2 of 2)
HW Port SDI
SIDL +
USAR
T
USAR
T
UART HEADSET GPIO