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MODULE
012 (T/R)
100D DSI
400/TTR*
400 E&M
400 GS/LS/TTR
LINE/TRUNK
TYPE
n/a
T-1 or PRI
Loop-start
and TTR
Tie trunk
Loop-start or
ground-start and
STATION TYPE
Single-line telephone;
MERLIN attendant;
MERLIN MAIL Voice
Messaging System T/R
adjunct (such as an
answering machine or fax
machine); analog data
device (such as a
modem)
n/a
Power failure transfer
(PFT) telephone
n/a
PFT telephone; button
needed for ground-sun
PFT telephone
SPECIFICATIONS
Capacity: 12 T/R stations
on 2-way voice transmission path
with support for telephones with
message-waiting LEDs. 2 TTRs
Power: 21-VDC, 600-ohm
battery source
Ringing current: 105-Vrms,
30-Hz sinusoidal ringing
superimposed on -48 VDC; a ring
generator must be installed
in the power supply module of
each carrier that has a 012
module
REN: <1.0 per port
Disconnect signal: 900 ms
(T/R short for answering
machines, G3 Fax etc)
Switchhook flash detection:
300-1200 ms
Capacity: 24 lines/trunks
for voice and analog data or 23
lines/trunks for voice and data
with 1 channel used for signaling.
Mode: multiplexes 24 or 23
line/trunks into 1 facility and
demultiplexes 1 facility into 23
or 24 lines/trunks
speed: Up to 64 kbps
Signalling: DS1 over 4-wire;
T-1 uses robbed-bit or common
channel; PRI has ISDN-PRI
-
(23B + 1 D)
Capacity: 4 lines/trunks.
4 TTRs. 1 PFT telephone
Signaling: Loop-start
Capacity: 4 tie lines
Method of completion:
automatic start, immediate-start.
wink-start, or delay-did-start
Signaling: E&M type IS.
type 1C. type 5
Capacity: 4 lines/trunks,
4 TTRs, 1 PFT telephone
signaling: Loop-start or
ground-start, optioned per port
TTR