GDK-100
DIGITAL KEY TELEPHONE SYSTEM
58
3.3.4 PFTU
Installation
The PFTU provides the relay contacts for the direct connection of 6 Exchange Lines (CO Lines) to 6
Extension Lines (SLT Lines) in event of a power or processor failure. The PFTU can be optionally installed
outside the BKSU on the wall with two screws provided.
2 control wires are connected to the CN13 (marking on PCB) on back-plane of the system as figure 3.3.4,
regardless of the polarity of control wires. The connector for CN13 is provided but control wires should be got
locally. The specification of control wires is AWG #22, #24 or #26 regardless of their length.
A RJ21 type connector, which consists of 25 pairs, is connected CO line, LCOB, SLIB and SLT as section
3.5 PFTU Wiring.
An earth terminal is provided, and the grounding method of the PFTU is shown in figure 3.3.5 when the
PFTU is installed outside BKSU.
And there is a test switch on the surface of PFTU; TEST position of the switch is used for testing PFTU
function, and NORMAL position of the switch for normal operation.
In case of SBKSU, a PFTU can be installed on the frame of BKSU in the system, its position is beside
MPB.
See Figure 3.3.5 for connection earth cable.
To CN13
on backplane.
No
rm
al
Te
st
RJ21 type connector
Earthing point
Figure 3.3.4
The exterior of PFTU
Содержание GDK-100
Страница 2: ...GDK 100 DIGITAL KEY TELEPHONE SYSTEM ii Blank sheet ...
Страница 52: ...GDK 100 DIGITAL KEY TELEPHONE SYSTEM 43 LKD 2NS LKD 8DS LKD 30DS LKD 30LD Figure 2 4 3 LKD Digital Keysets ...
Страница 53: ...GDK 100 DIGITAL KEY TELEPHONE SYSTEM 44 GSX 8BTN Figure 2 4 4 GSX Electronic Keysets GSX 33 EXE ...
