Power Failure Transfer; Figure 2-22 Extension Cabling - NEC SL1000 Hardware Manual

ISSUE 1.0
1. Open the Sub-Cover.
2. Insert the modular plugs of the extension line cords (2-wire/4-wire) into the extension modular
jacks on the KSU.
T: Tip
R: Ring
H: High
L: Low
Modular Cable
(4-wire, Straight)
T R
L H L
Multi-Line
Telephone
While an Analog Telephone (port) is ringing or MW-lamp is flashing on Analog
Phone (port), do not disconnect the phone from the port and do not connect
other type of the terminal to this port.
• DSS Console must be connected to the LAST PORT.
• Doorphone/External Sensor Device must be connected to the No. 6 or 7 PORT of each 408M-A1.
• The program setting must be required when connect a Doorphone/External Sensor Device.

1.6.5 Power Failure Transfer

1.6.5.1 General
In the event of AC power failure, the specified trunks are directly connected to the specified extension
ports as below. And SLT must be connected to the specified extension. The multi-line telephone (4W)
does not work when connected to the specified extension port.
Hardware Manual
Wire Position for each Port
T : Tip
R : Ring
L H
H : High
T R L : Low
Modular
Plug
(2-wire, Straight)
ST8
T
H
DSS Console SLT

Figure 2-22 Extension Cabling

Extension Port Position
ST8
ST6 or Doorphone/Sensor
ST7 or Doorphone/Sensor
Max cable length ( 0.5mm)
Modular Cable
ST6 or ST7
R T R
5 6
Doorphone
SL1000
ST2 ST1
ST6 or ST7
T R
External
Sensor Device
2-15