AT&T MERLIN LEGEND Release 2.0 Pocket Reference Manual page 36

Specifications
Highlights: 68000 processor at 10 MHz, built-in modem; built-in
diagnostics; Hybrid/PBX, Key, or Behind Switch mode option; RAM
backup for 12 days
Ports: Top RS-232-C port for SMDR; bottom RS-232-C port for system
programming PC
Power input: 117 VAC
Power output: +5 VDC (10 A), -5 VDC (2.50 A), -48 VDC (2.05 A)
Capacity: 54 unit loads
Capacity: 8 analog stations
Signaling: Analog multiline telephone protocol (40 kbps)
Loop range: 1000 feet (305 m), in-building or in-range out-of-building
(with analog IROB protectors) only
Capacity: 8 digital stations, each with 1 or 2 endpoints (each endpoint
assigned a separate extension number), including these station types:
digital voice only
digital voice with Voice Announce to Busy
digital voice and digital data (via 7500B Data Module)
digital voice and analog data
digital data only (7500B Data Module)
Signaling: BRI S/T protocol (two 64-kbps B channels, one 16-kbps
D channel) on a passive bus
Power: 48 VDC phantom power to telephone, 48 VDC over a separate
pair (7-8) to an operator console with DSS
Loop range: 1000 feet (305 m), in-building or in-range out-of-building
(with MLX IROB protectors) service only
Capacity: 8 T/R stations* on 2-way voice transmission path with support
for telephones with message-waiting LEDs; 2 TTRs
Notice to Telco: Meets FCC Class C
Ringing current: 105-Vrms sinusoidal ringing superimposed on
-48 VDC; a ring generator must be installed in the power supply module
of each carrier that has an 008 OPT 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
Loop resistance: Serves 2-wire loops to 1300 ohms, including stations
The system recognizes the OPT module as an 012 module having 12 ports.
However, the OPT module has only 8 jacks. Therefore, each installed OPT
module decreases the system's capacity by 4 ports.
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