Operating instructions
16 
Issue 1.0 March, 2006 
MAXIMUM LOOP RESISTANCE/IMPEDANCE 
Key Telephone  Less than 40 ohms 26 AWG / 200 m 
Single Line telephone  Less than 800 ohms 26 AWG / 800 m 
Doorphone  Less than 40 ohms 
Music Source Input Impedance  600 ohms 
  Maximum Input  0.775 VRMS 
INTERNAL RELAY CONTACTS 
Type  SPST 
Rating  1 AMP, 24VDC 
Function  Door Switch, Music on Hold, etc 
CABLE REQUIREMENTS 
CO/PABX Line  Twisted 1 Pair (2 wires) 
ISDN BRI  Twisted 2 Pair (4 wires) 
ISDN PRI   
DK1/DK2/ACP Digital Key Telephone  Twisted 1 Pair (2 wires) 
Doorphone  Twisted 1 Pair (2 wires) 
Door Switch  Twisted 1 Pair (2 wires) 
External Sensor  Twisted 1 Pair (2 wires) 
External Music Source  Twisted 1 Pair (2 wires) 
Single Line Telephone  Twisted 1 Pair (2 wires) 
Mechanical Specifications (Key Service Unit)
CABINET DIMENSIONS 
357mm W  126mm D  436mm H 
14.1”  4.96"  17.2” 
WEIGHT  17 Kg (Configuration: 4 x 8) 
  37.4 lbs 
Mechanical Specifications (Battery Back Up Housing)
CABINET DIMENSIONS 
15.5” W  3.0” D  5.75” H 
WEIGHT  With Batteries -16 lbs Without Batteries- 4 lbs. 
Mounting Screws  12.25” center to center 
Environmental Specifications 
  OPERATING CONDITIONS  STORAGE 
CONDITIONS 
Temperature  0º to 45º C  -40º to 66º C 
  (32º to 113º F)  (-40º to 150º F) 
Humidity  10 to 95% relative  10 to 95% relative 
  Non-condensing  non-condensing 










