NEC DSX PRODUCT DESCRIPTION - Page 153

Specifications
DSX Product Description Specifications and Parts ◆ 141
Specifications
and Parts
Telephone and Line Voltages
Keyset Voltages
DC voltage measured at the MDF (between tip
and ring)
Minimum: 36 VDC
Maximum: 44 VDC
Minimum operating DC voltage measured at
station jack (between tip and ring)
24 VDC
8/16SLIU Card Single Line Telephone Voltages
DC voltage measured at the MDF (between tip
and ring)
On-Hook Idle State Minimum: 44 VDC
On-Hook Idle State Maximum: 56 VDC
Off-Hook Active State: 7.5 VDC typical,
depending on the telephone type and loop length.
Ringing voltage 50-65 VAC, sinusoidal (sine wave)
High Voltage Message Waiting 95 VDC
REN (Ringer Equivalence) Per Port 2
Simultaneous Ringing Ringing cycles through the ports, ringing four
ports at a time.
Line Voltages
Ringing voltage 42-103 VAC @ 20 Hz
Battery (from telco) 44-56 VDC
External Paging
Output Impedance: 600 Ohm
Output Level: 0 dBr @ 1.0 KHz