NEC Univerge SV8100 System Hardware Manual page 158

Issue 1.0
3 - 24
6.5.4 Multiline Terminals and Equipment
The voltage, current, and ring signal for the Multiline Terminals,
Single Line Telephone equipment, and AP(A)-R/AP(R)-R Units are
listed below:
Multiline Terminal
Voltage: -11 ~ -26 Vdc
Maximum Current: 250 mA
Acoustical characteristics meet Electronic Industry
Association (EIA) standard proposal SP-1286 and
standard EIA RS-470.
Single Line Telephone
Standard 2500 Set: 500 type network
Nominal Current: 25 mA
Ring Signal: 56 Vac RMS @ 20 Hz
SLTII(1)-U( ) ADP
Standard 2500 Set: 500 type network
Nominal Current: 30 mA
Ring Signal: 56 Vac RMS @ 20 Hz
AP(A)-R Unit
Standard 2500 Set: 500 type network
Nominal Current: 30 mA
AP(R)-R Unit
Standard 2500 Set: 500 type network
Nominal Current: 30 mA
Ring Signal: 56 Vac RMS @ 20 Hz
UNIVERGE SV8100/SV8300
SV8300 System Specifications