NEC UX5000 Hardware Manual page 290

Chapter 6 - Specifications and Parts List
Constant Current Circuit: Current fixed at 20mA / -48Vdc
Resistance (Between SLT Adapter and Telephone): 500 Ohm (loop)
Signal Method
Signal Method
A label will be affixed to the product with the letters UL inside a circle which is the symbol
used by UL to indicate that a product is UL Listed. If you see a small "c" outside the symbol,
then the product also meets the requirements for Canada.
1. Do not run station cable in parallel with the AC source, telex or computer, etc. If the cables
2. When cables must be run on the floor, use cable protectors.
3. Cable runs for key terminals, single line telephones, Door Boxes, and 2PGDAD Modules
4. The Telco RJ21X and cross-connect blocks should install to the right of the Controlling
6 - 28
On-Hook Condition: 48VDC
Ringer Signal: 180 Vp-p, 16Hz
On-Hook Condition: -46VDC +- 3VDC
Message Waiting Signal: -110VDC +- 3VDC or FSK
Ringer Signal: 16Hz/20Hz/25Hz, 75Vrms +-1Vrms (no load condition), -28Vdc
Constant Current Type Battery Feeding: (25mA / -28Vdc)
are near cable runs to those devices, use shielded cable with grounded shields or install the
cable in conduit.
must be a dedicated, isolated cable pair.
/Base chassis. Extension blocks and cross-connect blocks should be installed to the left of
the Controlling/Base chassis.
SLT Adapter
SLIU BLADE / SLIDB
UL Listed System
Cabling Requirements
Chapter 6