GDK-100
DIGITAL KEY TELEPHONE SYSTEM
110
3.5.5 PFTU
Wiring
The PFTU is wired from the RJ21 type male connector on the modue itself to the MDF, cross connected to
the CO Line inputs from the telephone company, to the CO Line inputs of the system, and to Power Failure
SLTs. The CO lines and SLTs are used as CO line inputs and extensions of GDK-100 System in normal
operation, but each CO line and SLT is directly connected in power failure mode by connecting as shown in
figure 3.5.5
The cable with RJ21 type female connector is required between PFTU connector and MDF. It is possible to
get the cable locally, or use GDK-162 5MC1 supplied by LGIC on the order if necessary.
The MDF that is in wide use in your country can also be locally used according to the requirements of local
regulation.
M
D
F
1
26
4
29
SLIB1-T
SLIB1-R
PFTU
25
50
COT1-IN
COR1-IN
2
27
COT1-OUT
COR1-OUT
3
28
TEL1-T
TEL1-R
SLIB interface
CO line
LCOB interface
SLT
RJ21 type connector
in PFTU
Connected
to MB Basic
Connected to
another PFTU
Note:
1. A connector block with screws, which is connected to MB Basic (Back plane), is supplied in
the PFTU package, but control wires are not supplied. It is recommended that 2 wires with
AWG22, 24 or 26 be used for the connection of control signal.
2. The control wires can be connected regardless of their polarities
Figure 3.5.5
PFTU wiring