Canoga Perkins 2240, Руководство пользователя, Страница: 83 / 106

2240 Fiber Optic Modem
83
4.9.4 Internal
The internal function is used when network equipment is set for Eternal Timing (see
Figures 4-10 and 4-11). When connecting KG or KIV encryptors together on the Black
side, you should install the internal strapped header in the J3 position. In this applica-
tion, the modems are acting as the network timing source. In most cases, both modems
should be set for internal master clock. The rate switches should be set to the appropri-
ate speed for the circuit. This header is provided with the interface.
Figure 4-11.
Internal
Programmable
Buffered Interface,
Model P53
KG Swing
Jumpers
Internal
Clock From
Modem
Rx Data
Tx Clock
Tx Data
Modem
Alarm
From
Fiber
To
Fiber
Delay
Line
Inverter
FIFO
Data Out Data In
Shift Out Shift I n
W19
W20
8
SG
FG
CTS
DSR
RTS
FIFO
Clock
SCTE
TxD xD
From Modem
To Modem
To Modem
10
3
16
17
9
15
12
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
RxD
SCR
IN
OUT
J1
(DB
- 2
5
)
7
1
5
13
22
19
18
21
6
4
P/N 6100030-005
Wire Wrap
6-13
7-17
8-18
9-19
10-14
11-15
Net List
CANOGA
PERKINS
Data
Rx
Tx
Clock
Rate mode
Pwr Loop
On
Rem/Loc
2270
Fiber
Modem
Optics
TX RX
Off
CANOGA
PERKINS
Data
Rx Tx
Clock
Rate mode
Pwr
Loop
On
Rem/Loc
2270
Fiber
Modem
Optics
TX
RX
Off
MM or SM
Fiber Optics
KG/KIV
RED
BLK
KG/KIV
RED
BLK
P/N 6100030-005
Typical Internal Clock Application
Figure 4-10.
Internal
Programmable
Buffered Interface,
Model P53,
DCE RS-530