Zyxel Modems And A Pc; Serial Cable - ZyXEL Communications 2864 Series User Manual

ZyXEL MODEMS AND A PC

All of the modems of the 2864 series may be used with a PC. If you install the in-
ternal PC card model, you don't need a serial cable. The modem's standard profiles
should be just fine with most applications. If you are connecting to the modem's
parallel port, make sure that you have a bidirectional PC parallel port and use a
25-wire cable to make the connection. The ZyXEL serial/parallel adapter card pro-
vides you with a special high-speed PC-modem communication advantage when
working with a 2864 series modem.

Serial Cable

Most PCs are equipped with more than one serial port. Standard cables are readily
available from many suppliers. Usually, serial ports are manufactured in two forms,
either with a 25-pin male jack or a 9-pin male jack.
1 2 3
14 15 16 17 18 19 20
Fig. 21.1: 25-pin and 9-pin male connectors usually found in PCs.
To connect a PC to the modem, you need the following 9-wire cable:
Computer
9-pin
1
2
3
4
5
6
7
8
9
Chapter 21
4 5 6 7 8
21 22
25-pin
8
3
2
20
7
6
4
5
22
9 10 11 12 13
23 24 25
Signal
CD
RXD
TXD
DTR
Signal Ground
DSR
RTS
CTS
RI
21–1
1 2 3 4
6 7 8
Modem
8
3
2
20
7
6
4
5
22
5
9