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

ISSUE 3.0
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
Multiline
Telephone
While an Analog Telephone (port) is ringing or MW-lamp is flashing on an
Analog Phone (port), do not disconnect the phone from the port or connect
another 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 is required when connecting 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 multiline 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
L : Low
T R
Modular
Plug
ST8
T
L H
DSS Console SLT

Figure 2-22 Extension Cabling

Extension Port Position
ST8
ST6 or Doorphone/Sensor
ST7 or Doorphone/Sensor
Max cable length
(24AWG 0.5 mm)
KTS, DSS
SLT 1,125 m (3,691 ft)
Doorphone
Modular Cable
(2-wire, Straight)
ST6 or ST7
R T R
5 6
Doorphone
SL1000
ST2 ST1
300 m (984.3 ft)
150 m (492.1 ft)
ST6 or ST7
T R
External
Sensor Device
2-17