GDK-100
DIGITAL KEY TELEPHONE SYSTEM
98
3.5.4 Extension Board wiring
Extension boards such as DTIB12, DTIB24, ETIB, DSIB, SLIB24, SLIB48 and SLIB II contains a RJ21 type
female connector for station wiring to each interface circuit on each board. But WTIB and WTIU, Wireless
Terminal Interface Board/Unit for DECT contains RJ11 type jacks.
The following provides details on the interconnection between each type of Extension Board and the jack
on the station.
3.5.4.1
Digital Keyset and Terminal wiring
Wiring from digital terminal interface board such as DTIB12, DTIB24 and DSIB to station jack requires one
pair of wire. The power for a station, PCM data and signaling between board and station are transmitted over
this pair.
Contact assignments of RJ11 type jack in Digital Terminals
Figure 3.5.4.1.a shows the contact assignments of the miniature 6-position jack (RJ11 type jack) in LG
proprietary digital terminals. Two wires from the digital terminal interface of the system are basically
connected to the contact numbers 3 (R) and 4(T).
But two additional contacts, R1 and T1 are provided in the digital terminal as shown in Figure 3.5.4.1. The
contact number 3 (R) and 2 (R1) are connected together in the digital terminals, and also the contact number
4 (T) and 5 (T1) are connected together. Because there is a country in which the contact number 2 and 5 are
used for the 2-wire connection method according to his local regulation. So LGIC provide two more contacts,
R1 and T1 in the digital terminals so that the special customer can use the line cord, which is in wide use in
his country.
But only 2-wire connection should be recommended to get better transmission characteristics between digital
terminal interface of the system and digital terminals.
Connection method between the digital interfaces and the digital terminals
The cable with 25-pair male connector is required between Digital 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
Figure 3.5.4.1.a
contact assignments of Digital Terminals
T
T1
R
R1
1 2 3 4 5 6
Содержание GDK-100
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