Silicon Graphics CHALLENGE L, User Manual, Page: 87 / 164

Connecting a Modem
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The following files are most commonly used to properly configure serial
port operation for the server:
• /etc/inittab
• /etc/gettydefs
• /etc/ttytype
• /usr/lib/terminfo
• /etc/uucp/Systems
Connecting a Modem
A modem can be connected to your system by connecting a modem cable to
one of the 9-pin serial connectors on the I/O panel. The pin assignments are
listed in Table 4-6. A 9-pin to 25-pin cable may be required. Silicon Graphics
supports Hayes 2400 and Telebit modems. Edit the
/etc/uucp/fix-hayes or
/etc/uucp/fix-telebit files for information on specific models supported (see
step 7 on the next page).
Be sure that the pin assignments, not the pin numbers, on the Challenge
system’s serial port are properly matched to the pin assignments on your
modem.
Table 4-6 RS-232 Modem Connector Pin Assignments
9-Pin Connector Pin 25-Pin Connector Pin Signal Description at Host
2 2 Transmitted Data (TXD)
3 3 Received Data (RXD)
4 4 Request to Send (RTS)
5 5 Clear to Send (CTS)
7 7 Signal Ground (GND)
8 8 Data Carrier Detect (DCD)
9 20 Data Terminal Ready (DTR)