CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 74)

Chapter 4 Data Interfaces 2240 Fiber Optic Modem User Manual
Programmable Buffered Interface/Model P53
74
4.9.3 External Station
The External Station is used when an external station clock is providing timing (see Figure 4-8
and Figure 4-9). 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. The
figures below show a typical external station clock application.
Figure 4-8 External Station Programmable Buffered Interface, Model P53, DCE RS-530
Figure 4-9 Programmable Buffered Interface, Model P53, External Station
CANOGA CANOGA PERKINS PERKINS
Data Data
Rx Rx Tx Tx
Clock Clock
Rate mode Rate mode
Pwr Pwr Loop Loop
On On Rem/Loc Rem/Loc
2270 2270
Fiber Fiber
Modem Modem
Optics Optics
TX TX RX RX
Off Off
CANOGA CANOGA PERKINS PERKINS
Data Data
Rx Rx Tx Tx
Clock Clock
Rate mode Rate mode
Pwr Pwr Loop Loop
On On Rem/Loc Rem/Loc
2270 2270
Fiber Fiber
Modem Modem
Optics Optics
TX TX RX RX
Off Off
MM or SM
Fiber Optics
KG/KIV
RED BLK
Station
Clock
KG/KIV
RED BLK
RxD
KG Swing
Jumpers
Internal
Clock From
Modem
Rx Data
Tx Clock
Tx Data
Modem
Alarm
Function
From
Fiber
Circuits
To
Fiber
Circuits
Delay
Line
Inverter
FIFO
Data Out Data In
Shift Out Shift I n W19
W20
8
10
3
16
17
9
15
12
CTS
DSR
RTS
FIFO
Clock
SCTE
TxDxD
From Modem
To Modem
To Modem
5
12
19
13
14
16
17
18
3
4
9
6
1
2
11
10
15
7
8
20
23
24
11
2
14
LL
RL
SCT
RLSD
SCR
IN
OUT
J1(DB - 25)
7 SG
1 FG
5
13
22
19
18
21
6
4
Wire Wrap
Net List
3-6
4-9
5-7, 14 & 17
8-18
12-19
P/N 6100030-004