GDK-100
DIGITAL KEY TELEPHONE SYSTEM
85
!
Note
1. CON1: Trace for the purpose of development and maintenance.
The external module for RS 232C serial interface should be required for trace.
See GDK-TRC1 in section 2.
2. CON3, CON4: They are used to control the reference clock signal when multi-ISDN boards are
installed.
See
[Clock Control Cable Wiring]
on section 3.5.
The line connector and termination switches
S/T selection
Terminating Resistors
Line No
RJ45 type
Jack
Switch
all to “T “
All to “S”
Switch
all to ON
all to OFF
Line 1
CON8 SW4 T
S SW9
terminating open
Line 2
CON7 SW3 T
S SW8
terminating open
Line 3
CON6 SW2 T
S SW7
terminating open
Line 4
CON5
SW5
T
S
SW6
terminating open
!
Note:
1. The setting method of S/T selection switches: default -all T position when delivering the board.
Each line interface can be used for T interface or S interface with different operation interface. If
necessary, the S/T selection switches of SW2, SW3, SW4 and/or SW5 can be respectively set to
the T or S position by using shorting traps (short pins) supplied on the boards.
2. Two poles of SW6, SW7, SW8 and/or SW9 should set to the ON position to terminate two
terminating resistors on a line. (default ON)
3.
Terminating resistors and selectable switches are introduced only on PCB issue 2 or later,
but not on PCB issue 1. So if you use STIB issue 1, the external terminating resistors are
required. For the external termination, you can get the terminating unit locally or use GDK-
162/100 TERM, which is the terminating unit with 4 P-to-P connection provided by LGIC.
Power does not feeding
Power feeding
POWER
T
S
SW2/SW3/SW4/SW5
Shorting
trap
Figure 3.4.6.2.a
Configuration of S/T selection connectors
!
Note:
1. Each line can be selected to T or S interface according to the needs.
2. After setting all lines respectively, the slot(s) of STIB must be assigned as CO
slot(s) and STA slot(s) together in Admin field 02 for the proper operation of STIB.
See the clause 4.2 and the Programming Manual.