NEC UX5000 Hardware Manual page 314

Chapter 6 - Specifications and Parts List
Purpose
Target Peripheral
Install Slot
Ten Key Dial Pad
PSTN & PBX Selection Key
PSTN Type
Dial Method
AC Adapter
Public Standard
Constant Current Circuit: Current fixed at 20mA / -48Vdc
Resistance (Between SLT Adapter and Telephone): 500 Ohm (loop)
Signal Method
On-Hook Condition: 48VDC
Ringer Signal: 180 Vp-p, 16Hz
Signal Method
On-Hook Condition: -28VDC
Message Waiting Signal: -110VDC or FSK
Ringer Signal: 16Hz/20Hz/25Hz, 75Vrms (no load condition), -28Vdc
Constant Current Type Battery Feeding: (25mA / -28Vdc)
6 - 30
PSA - PSTN Adapter for Analog Telephone
Provide Functionality In Case of Power Failure or Down
Network
Capability for PSTN & PBX Connection in Remote Office
IP-CTS and Enhanced IP Phones
Enhanced Digital Phones
Handset Slot (left of terminal - handset cradle needs to be
changed)
Must Change Dial Pad Kit on Telephone To Dedicated
Double-Contact Dial Pad Key Without Backlit
Yes (surface on the cradle)
Analog PSTN
MF/DP 20pps/10pps)
Not Required
UL/CSA 60950, FCC Part. 15 Class B, FCC Part 68, RoHS
SLT Adapter
SLIU BLADE / SLIDB
Chapter 6