GDK-100
DIGITAL KEY TELEPHONE SYSTEM
101
3.5.4.2
Electronic Keyset and Terminal wiring
Contact assignments of RJ11 type jack in Eletronic Terminals
Wiring from electronic terminal interface board to station jack requires two pairs of wires. The first pair is for
the audible analog signal including voice, and the second one is for signaling and data communication. The
pair for data and signaling is polarity sensitive, so electronic terminal will not properly operate when reversed.
However the reversal will not harm terminal or system.
Power is delivered by applying DC voltage to the center tap of the coupling transformers of each of 2 pairs.
Figure 3.5.4.2.a shows contact assignments of RJ11 type jack on LG proprietary electronic terminals.
Connection method between the ETIB and the Electronic terminals
The cable with 25-pair male connector is required between Electronic Terminal Interface board and MDF. It
is possible to get the cable locally, or use GDK-162 5MC2 supplied by LGIC on the order if necessary.
The MDF that is in wide use in the country can be locally used according to the requirements of local
regulation.
Figure 3.5.4.2.a
Contact assignments of Electronic Terminals
VT
DT
VR
DR
1 2 3 4 5 6
MDF
1
2
3 4 5 6
G
DK-
100 ET
IB
RJ21 type
connector
on the board
1
26
2
27
3
28
4
29
VT1
VR1
DT1
DR1
VT2
VR2
Area
A
Area
B
Area
C
Area
D
Area
E
DT2
DR2
RJ11 type jack
on terminal
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 ...
