2-6 Specifications
297-2041-900 Standard 02.01 October 1991
DMS-100 or DMS-250. The 6X21AC card supports one business set per
line card.
Powering Requirements
The M5212 ACD set is powered through both its loop connection to the CO
and through an external power supply.
Loop power
Loop power is supplied by a balanced 440 Ohm battery feed from the
switching equipment. The switch battery voltage supplied to the loop is
nominally 52 V dc, with a minimum of 42.75 V dc and a maximum of 56 V
dc. Under normal conditions, the polarity must be negative on the Ring lead
with respect to the Tip lead.
The current drawn from the loop is typically10 mA when the set is idle, and
16 mA when the set is active.
External power
Each M5212 requires an external power supply to be fully operational. If
the external power supply fails, only feature keys 0 through 9, and LCDs 0
through 7 will be operational.
This external power supply must be 16 V ac and must satisfy the following
set current demands:
•
Active state local power consumption:
Maximum current drawn is
(with 2 carbon equivalent headsets)
120 mA rms (2.2W)
•
Idle state local power consumption:
Maximum current drawn is
(with no headsets seated)
40 mA rms (0.750W)
Two closet dc power supply units are recommended:
•
Shumway; No. TBA, 110 V ac input, 24 V dc, 200mA outputs
•
NPS 50220-07.L8; CPC A0352921 (1 circuit), 110V ac, input, 24V dc,
250mA output
When using the closet power supply, the following points should be
observed:
•
A separate cable, containing Tip, Ring, and power supply leads, is
required for each M5212 set.
•
Each M5212 set is to be connected to a different power supply circuit.
•
The run length between the closet power supply and the M5212 must not
exceed 76m (250 ft) of 24 or 22 AWG wire, or 46m (150 ft) of 26 AWG
wire.
•
Wire pairs should not be paralleled to reduce feed resistances.
