User guide

Chapter 3 - Software Installation

3.15.8.1 Devices Mapped for Hybrid Cards (ISIHI-xx and ISIHP-xx cards):

For the 2-BRI hybrid cards (8 ports; ISIHI-2S/2U and ISIHP-2S/2U)

- /dev/ttyM1a to /dev/ttyM1d for ISDN ports. (These four ports correspond to the

total

of four B-channels available on the two BRI lines connected to these cards.)

- /dev/ttyM1e to /dev/ttyM1h for modem ports. (These four ports accommodate the

total of four 56K modems that can operate on the four B-channels available on the

two BRI lines that can be connected to these cards.)

For the 4-BRI hybrid cards (16 ports; ISIHP-4S/4U/4SD):

- /dev/ttyM1a to /dev/ttyM1h for ISDN ports. (These eight ports correspond to the

total of eight B-channels available on the four BRI lines that can be connected to

these cards.)

- /dev/ttyM1i to /dev/ttyM1p for modem ports. (For the ISIHP-4S/4U, these eight

ports accommodate the total of eight56K modems that can operate on the eight B-

channels available on the four BRI lines that can be connected to these cards.

Note: This device mapping for ttyM1i through ttyM1p does not apply to the ISIHP-4SD. This is because the

ISIHP-4SD works with ISDN ports, or terminal adapter ports, only. The ISIHP-4SD contains no modems in its

circuitry.

3.15.9 LINUX: Dial-in Configuration

To configure a particular port for dial-in, utilities like 'mgetty' need to be installed on the system. If, for

example, the port /dev/ttyM2c needs to be configured for a remote-access dial-in connection, an entry of the

form 'M2c:12345:respawn:/sbin/mgetty ttyM2c' needs to be added in the /etc/inittab file. After you have made

the change, execute 'init q' so that the 'init' process re-reads the inittab file and spawns the mgetty process to

wait for an incoming connection. Users can then dial in, use their user names and passwords to log in, and

access their accounts on the machine.

To disable dial-in access on a particular port, change the entry in the /etc/inittab file to 'M2c:12345:off:/sbin/

mgetty ttyM2c'or just comment-out that entry by prefixing a '#' to the entry on the line.

3.15.10 LINUX: PPP Setup

The 'PPP-HOWTO' (a document that is available as a part of the 'HOWTO' documentation on most of the

distributions under /usr/doc/HOWTO) explains in detail the procedure for configuring a Linux machine as a

PPP server. This information is also available at

http://www.interweft.com.au/other/ppp-howto/ppp-howto.html.

The documentation in the PPP-HOWTO is directly applicable to ISI ports.

Note: A base I/O address of 0, e.g., ISIBaseX=oxo, or omission of these parameters for any card X, disables

that particular card.