5: Testing and Troubleshooting
TW7201I-MS
5-21
Table 5-15 DHSL Modem J11 Pin Assignments
Pin
Signal
Description
1
GND
Chassis ground
2
+12V
No connection
3
SPIRXD
No connection
4
SPICLK
No connection
5
SPITXD
No connection
6
RS232-2T
RS-232 transmit line to
ACC 1
7
RS232-2R
RS-232 receive line to
ACC 1
8
DCD\
DCD line to
ACC 2
(active low)
9
NC
CW key line to Power Supply/Interface
board
10
ECTXA
Transmit audio to Audio board
(transceiver modem only)
11
NC
No connection
12
NC
No connection
13
EN12
No connection
14
GND
Chassis ground
15
+12V
No connection
16
SPITXD
No connection
17
BITE
No connection
18
RS232-1R
RS-232 receive line to
ACC 2
19
RS232-1T
RS-232 transmit line to
ACC 2
20
600TXA
600 ohm accessory transmit audio input
from either accessory connector
21
600RXA
600 ohm accessory receive audio output to
either accessory connector
22
ECRXA
Receive audio from Audio board
(transceiver modem only)
23
EXAUPTT\
External audio PTT input from the Power
Supply/Interface board (active low)
24
FPWSP1
Spare channel to
ACC 1
accessory
connector
25
FPWSP2
No connection
Summary of Contents for TW7201I
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Page 86: ...TW7201I MS Figure 5 4 DHSL Modem Board Schematic Diagram 994184 Rev E 5 25 ...
Page 99: ...TW7201I MS Figure 5 6 Power Supply Interface Schematic Diagram 994222 Rev D 5 39 ...
Page 104: ...TW7201I MS TW7201I MS Figure 5 8 Switching Board Schematic Diagram 994149 Rev A 5 45 ...
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