NEC DSX PRODUCT DESCRIPTION Manual page 153

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