MERLIN LEGEND Communications System Release 6.1
Pocket Reference
555-661-116
Issue 1
August 1998
Page 75
Control Unit Modules
* 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.
† If one OPT station calls another OPT station, the loss values of the two
OPT stations are added resulting in transmission levels that are too low.
008 OPT modules (517D28) may be hardware configured to 0dB loss,
however this should only be done if all or the majority of calls from the OPT
stations are to other OPT stations. Setting the loss value to 0dB violates
EIA-464-A-1 specifications. Contact Tier 4 before modifying the loss value
settings of 008 OPT modules.
Specifications
Highlights: 68EC020 processor at 16 MHz, built-in 1200/2400-bps modem;
built-in diagnostics; Hybrid/PBX, Key, or Behind Switch mode option; 1.5 MB
RAM backup for 4 days; PCMCIA interface
Ports: Three RS-232-C ports. One for debugging (plugged to prevent
access), one for SMDR, and one for system administration
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 extensions
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 extensions, each with 1 or 2 endpoints (each endpoint
assigned a separate extension number), including these extension types:
■ CTI link (only one per system)
■ digital voice only
■ digital voice with Voice Announce to Busy
■ digital voice and digital data (via ISDN terminal adapter)
■ digital voice and analog data
■ digital data only (ISDN Terminal Adapter)
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 a DSS
Loop range: 3000 feet (914 m), in-building or in-range out-of-building (with
MLX IROB protectors) service only
Capacity: 8 T/R extensions* on 2-way voice transmission path with support
for telephones with message-waiting LEDs; built-in ring generator; 2 TTRs
Notice to Telephone Company: Meets FCC Class C
Ringing current: 75-Vrms, 20-Hz trapezoidal ringing superimposed on -48
VDC.
REN: ≤ 1.0 per port
Disconnect signal: 900 ms (T/R short for analog modem, G3 fax, etc.)
Switchhook flash detection: 300–1200 ms
Loop resistance: Serves 2-wire loops to 1300 ohms, including extensions
dB loss†: 3dB (factory setting), 0dB if all calls are to another OPT station.
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