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Environmental and safety considerations Page 109 of 174
M3900 Series Meridian Digital Telephones Description, Installation and Administration
Line engineering
The M3900 Series Meridian Digital Telephones use twisted pair wiring on
transmission lines determined by the rules in Digital Telephone Line
Engineering (553-2201-180). The maximum acceptable loop length is 1067
m. (3500 ft), 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.
M3900 set power consumption
CAUTION
Use only the line cord provided with the telephone. A line cord
designed for another telephone can cause damage to the equipment.
Table 14
M3900 set power consumption
M3901 M3902 M3903 M3904 M3905
Idle 29.3 37.3 42.5 31.5 15.02
H/F Nominal N/A 45.7 48.7 37.5 N/A
H/F
Maximum
N/A 64.3 59.7 46.4 N/A
DBA Idle N/A N/A N/A 39.29 15.31
DBA H/F
Nominal
N/A N/A N/A 45.9 N/A
DBA H/F N/A N/A N/A 52 N/A
Maximum 2
KBA Idle
N/A N/A N/A 33.42 14.98
Note: All measurements are in milli-amps.