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MERLIN LEGEND Communications System Release 7.0
Pocket Reference
555-670-116
Issue 1
April 1999
73
Ordering Codes
Specifications
Capacity: 12 T/R extensions on 2-way voice transmission path with support for
telephones with message-waiting lights, 2 TTRs
Ringing current: 105-Vrms, 30-Hz sinusoidal ringing superimposed on
-48 VDC
REN: ≤ 4.0 per port
Disconnect signal: 900 ms (T/R short for analog modems, G3 fax, etc.)
Switchhook flash detection: 300–1200 ms
Capacity: 16 T/R extensions on 2-way voice transmission path with support for
telephones with message waiting lights, 4 TTRs
Power: 40-VDC, 600-ohm battery source
Ringing current: 105-Vrms, 30-Hz sinusoidal ringing superimposed on
-48 VDC
REN: ≥ 4.0 per port
Disconnect signal: 900 ms (T/R short for analog modems, G3 fax, etc.)
Switchhook flash detection: 300–1200 ms
Capacity: 16 ETR station ports including 6 with T/R functionality and 4 TTRs.
First 10 ports are ETR ports only; remaining 6 ports can support either T/R or
ETR, but not both simultaneously
Power: -48V for ETR and -49V normal for T/R
Ringing current: 20/25 Hz balanced trapezoidal ring signal
REN: 2 per port
Off-hook detection: ≥18mA, ≤30ma, ≥20 msec for T/R; massage control for
ETR
On-hook detection: ≤14mA for T/R; massage control for ETR
T/R switchhook flash detection: 300-1200 ms
Capacity: 16 digital station ports
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