Detailing The The Analog Terminal Interface Specifications
Power requirements:
Supplied by the common equipment
Ringing voltage:
55 VAC Nominal @ 20 Hz
(45 VAC minimum)
Power rated to maximum
REN = 2.0
Battery feed voltage:
24 VDC nominal
Loop current limits between ATI-D
and IST interface:
20 ma min. at 620 ohms
70 ma max. at 0 ohms
DC loop limits from ATI-D to
industry standard interface per port:
620 ohms maximum including interfaced telephony device.
(Approximately 4000 feet with #26 AWG twisted-pair cable
and 300 ohm device load.)
(Approximately 500 feet if two IST devices are connected in
parallel on same tip and ring pair.)
DC loop limits from ATI-D to voice
mail system:
Approximately 1000 feet with #26 AWG twisted-pair cable.
Cable insulation resistance:
30,000 ohms minimum
Cable requirement ATI-D to system
2-pair twisted cable; 25 feet maximum length. (Both common
equipment station ports must always be connected to the
ATI-D for every installation, and they must be paired in
sequence - 12 & 13, 14 & 15, etc.)
Cable terminations:
623-type, 4-conductor mini jacks
Dialing:
Industry-standard DTMF or Dial pulse (rotary) with nominal
make/break ratio of 40/60 @ 10 PPS
Ringing cadence:
Outside calls = 2 second on -
4 seconds off
Intercom calls = Two bursts:
1 second on - .5 second off,
1 second on - 3.5 seconds off
Operating temperature:
32-122 F (0-50 C)
Humidity:
90 % relative, non-condensing
Height:
2.375 inches
Width:
8.062 inches
Length:
11.125 inches
Weight:
4 lbs. (plus 2 lbs.
for packing material)
FCC registered and listed for safety compliance as part of digital telephone system
FCC certified, Part 15 (class A)
DSU II Digital Telephone System
IMI66–132
Installing The DSU II Digital Telephone System 2 – 65
Summary of Contents for DSU II
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