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2.2
Connectors
All connectors are directly mounted on the modem board. The connector name, type of
connectors and their functions are as follows:
Connector
Type
X1
64-pin Euro
X2
9-pin D-connector
Xn.1
RJ12
Xn.2
9-pin D-connector
Xn.3
10-pin
n is the card slot number for the modem board.
Connectors X2 and Xn.3 are connected in parallel. For a description of the pin configura-
tion of each connector, refer to chapter 'Technical Specifications'.
LED indicators
LIN
Modem connected to line (off hook), connected to the line relay control signals
RNG Indicates a true ringingsignal, connected to the micro controller
TXD Tranmitted data, connected to modem's TxD-signal
RDX Received data, connected to modem's RxD-signal
CD
Carrier detect, connected to the micro controller
RTS Ready To Send, connected to the micro controller
IRF
Internal Fault detected by the watchdog. Led is normally off.
Xn.1, RJ-12 Telephone line
Xn.2, RS-232 connector
Xn.3, radio and leased line connector
1 TX_LINEA, 2-wire connection and 4-wire transmit.
2 TX_LINEB, 2-wire connection and 4-wire transmit.
3 RX_LINEA, 4-wire receive data.
4 RX_LINEB, 4-wire receive data.
5 Not connected
6 RADIO_ONA, Radio ON relay, normally open contact.
7 RADIO_ONC, Radio ON relay, common.
8 RADIO_ONB, Radio ON relay, normally closed contact.
9 SCUELCH STATEA, Radio subscriber detect (+).
10 SCUELCH STATEB, Radio subscriber detect (–).
Fig. 2. Connection view
As the cables to be used for connecting the modem to the telephone network, leased lines
and radio system depend on local conditions, these are not provided. For connecting a PC
to the modem, use a standard RS232.
Function
power supply
RS 232 serial interface
public telephone network
RS 232 serial interface
leased line / radio
Pin
Signal
V.24
I/O
1
DCD
109
2
RxD
104
3
TxD
103
4
DTR
108/2
5
GND
102
6
DSR
107
7
RTS
105
8
CTS
106
9
RI
125
Description
O
Data Carrier Detect
O
Received data
I
Transmitted data
I
Data Terminal Ready
-
Signal ground
O
Data Set Ready
I
Request TO Send
O
Clear TO Send
O
Ring Indicate
11
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