GDK-100
DIGITAL KEY TELEPHONE SYSTEM
83
2. CON3, CON4: They are used to control the reference clock signal when multi-ISDN boards
are installed.
See
[Clock Control Cable Wiring]
in section 3.5.
The line connector and terminating resistors
Terminating Resistors
Line No
RJ45 type jack
Switch
All ON
All OFF
Line 1
CON8
SW5 terminating open
Line 2
CON7
SW4 terminating open
Line 3
CON6
SW3 terminating open
Line 4
CON5
SW2
terminating open
!
Note
1. Two poles of SW2, SW3, SW4 and SW5 should be set to the ON position to terminate two
terminating resistors on a line. (default ON)
2.
Terminating resistors and selectable switches are introduced only on PCB issue 3 or later,
but not on PCB issue 1 and 2. So if you use BRIB issue 1 and 2, 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 connections provided
by LGIC.
RJ45
CON5
CON3(IN)
SW1
1 2 3 4
GDK-100 BRIB
LED1
LED2
LED3
LED4
CON4(OUT)
CON1
U11
(ROM1)
U10
(ROM2)
RJ45
CON6
RJ45
CON7
CON2
RJ45
CON8
1 2 3 4
SW5
1 2
ON OFF
SW4
1 2
ON OFF
SW3
1 2
ON OFF
SW2
1 2
ON OFF
Figure 3.4.6.1
BRIB Layout
Содержание GDK-100
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