Multitech MULTI MODEM II MT5600BA - Manual (Page 107)

G Pin Descriptions
101
MultiModemII User Guide
RDL 21 RDL Remote Digital Loop Input to modem to enable RDL test.
RI 22 Ring Indicator RI output high indicates the presence of
a ring signal on the telephone line.
23 NC
XCLK 24 XCLK External Clock Input to modem used in special syn-
chronous applications.
TM 25 TM Test Mode Output from modem to indicate modem is
in one of the test modes.
RS-232 Cable Pinouts
20 DTR
22 RI
8 CD
7 GND
6 DSR
5 CTS
4 RTS
3 RD
2 TD
DTE DB-25
connector
DCE DB-25
connector
DTR 20
RI 22
CD 8
GND 7
DSR 6
CTS 5
RTS 4
RD 3
TD 2
Fig. G-1. 25-pin to 25-pin RS-232 cable.
20 DTR
22 RI
8 CD
7 GND
6 DSR
5 CTS
4 RTS
3 RD
2 TD
DCE DB-25
connector
DTE DB-9
connector
DTR 4
RI 9
CD 1
GND 5
DSR 6
CTS 8
RTS 7
RD 2
TD 3
Fig. G-2. 9-pin to 25-pin RS-232 cable.
Label Pin I/O type Signal name/description