CANOGA PERKINS 2270 Fiber Optic Modem - Manual (Page 39)

39
2270 Fiber Optic Modem
3.9.2 External Station, Wire Wrap Header P/N 6100030-004
The External Station is used when an external station clock is providing timing (see Figure 3-7).
When connecting KG or KIV encryptors together on the Black side, using an external timing
device you should install the external station clock strapped header in the J3 position. In this
application, the modems are acting as the network, although the timing input is from an outside
source. The modem in which the timing source is connected should be set for external and the
other modem set for slave. This header is provided with the interface.
SG
FG
7
1
EXTERNAL STATION
PROGRAMMABLE BUFFERED INTERFACE
MODEL P53, DCE RS-530
KG SWING
JUMPERS
FIFO
DATA OUT DATA IN
SHIFT OUT SHIFT IN
5
12
19
13
14
16
17
18
Tx CLOCK
Tx DATA
3
4
9
6
1
2
11
10
15
7
8
W20
W19
8
RLSD
RxD
10
3
16
17
9
SCR
15
12
SCT
FIFO
CLOCK
20
23
24
11
2
14
SCTE
RxD
TO
FIBER
CIRCUITS
FROM
FIBER
CIRCUITS
MODEM
ALARM
Rx DATA
Rx CLOCK
INVERTER
DELAY
LINE
INTERNAL
CLOCK FROM
MODEM
3-6
4-9
5-7
8-18
7-17 & 14
12-19
IN
OUT
IN
OUT
Figure 3-7.
Programmable
Buffered Interface,
Model P53, Exter-
nal Station