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MERLIN LEGEND Communications System Release 7.0
Pocket Reference
555-670-116
Issue 1
April 1999
71
Ordering Codes
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: 3 RS-232-C ports—1 for debugging (plugged to prevent access), one
for SMDR, and 1 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 extension jacks
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 extension jacks, each with 1 or 2 extensions (each
extension is assigned an individual extension number)
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 lights, 2 TTRs
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
1
: 3dB (factory setting), 0dB if all calls are to another OPT station.
1 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.