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Powering Requirements
Voice
The M2000 Digital Telephones are loop–powered. Loop power uses a
30-V DC source and assumes 3500 ft. (915 m) maximum loop length
of 24 AWG polyvinylchloride (PVC) (0.5 mm) standard twisted wire with
no bridge taps. Cables longer than 3500 ft. could exceed the maximum
15.5 dB loss at 256 KHz. For loop lengths longer than 3500 ft., the loop
should use 24 AWG or larger wire with polyolefin, polyethelene, or
Teflon insulation.
The Handsfree unit, which is integrated in the M2112, requires an
auxiliary power supply. The auxiliary power derives from the 20-V ac
closet power supply (QUT1) or a local plug–in transformer over a
separate pair of wires. The closet power supply must not be further
away from the handsfree unit than the maximum allowable loop length
for loop–powering.
If the auxiliary power supply fails, the handsfree feature does not
operate. However, all other loop-powered functions remain operational.
In case of a general ac power failure, the telephones remain operational
(without the handsfree features) only if the Meridian SL-100 system
uses a backup battery.
WARNING - Possibility of equipment damage
Data
An auxiliary power supply/converter is needed in addition to the power
from the loop. A 60 Hz, 110-V AC or a 50 Hz, 220-V AC plug–in power
supply/converter provides nominal voltages of +5 V, +12 V, and -12 V.
The power supply/converter connects to the back of the telephone
through a 5-pin power connector. If the power supply/converter fails, the
M2112 cannot process data calls.
Alerting tone characteristics
The M2000 digital telephone series provides four alerting tones and a
buzz sound. The system controls the cadence of the ringing by sending
tone-ON and tone-OFF messages to the telephone. The SL-100
WARNING
Telephone set damage
Do not plug a M2000 Digital Telephone into a wall
jack wired with -48V for 2500 telephone sets. This
causes permanent damage to the M2000 telephone.
Meridian SL-100 M2000 Digital Telephone Reference Manual
General description 9
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