Installing and Administering PPP

148 Appendix A
Modem Connections
RS-232 Interface
HP Modem Cables
Most HP systems do not use straight through modem cables to connect
the modem to the system. Make sure you are using the correct cable that
is proper for your system.
HP Modem Cable (Series 700)
The HP 9000/700 series workstation provides a DB-9 port for connection
to aysnchronous serial devices. Hewlett-Packard recommends that you
use cable part number 24542M to connect a 9000/700 system to a DB-25
asynchronous modem. A similar part number (24542G) describes a
printer cable. Do not confuse the two part numbers if you order the
Hewlett-Packard cable. If you cannot get the HP part, use a cable like
the one described in the table below.
HP Modem Cable (Series 800)
For an 800 series system with a model 5062-3054 MDP "Full Modem"
connector panel use the HP part #40233A modem cable. If you cannot get
the HP part, use a cable like the one described in the table below.
Signal Direction DB-9 Pin DB-25 Pin
Carrier Detect (CD) from Modem 1 8
Receive Data (RD) from Modem 2 3
Transmit Data (TD) from DTE 3 2
Data Terminal Ready
(DTR)
from DTE 4 20
Ground both 5 7
Data Set Ready (DSR) from Modem 6 6
Request To Send (RTS) from DTE 7 4
Clear To Send (CTS) from Modem 8 5
Ring Indicator (RI) from Modem 9 22