Sun-microsystems Sun PCI High Speed Quad Port Serial Interface Adap Manuel d'utilisateur télécharger pdf (Page 49)

APPENDIX

Null Modem Cable Requirements

A synchronous null modem cable is a specially-configured cable that simulates

modems that are connected back-to-back. When the distance between the two host

systems is not great, you may be able to use a null modem cable instead of a

synchronous modem or a synchronous modem eliminator.

The maximum distance a null modem cable can work is determined by the

specification for your serial port interface.

There are two steps you must perform to use a null modem cable for machine

supplied clocking:

Run hsip_init (see “Configuring Internal or External Clocking” on page 30) so that

the Sun system, in the absence of a synchronous modem, supplies clocking on the

serial line.

Build or configure the cable for the null modem.

Note – You must run hsip_init each time you reboot your system.

The following topics are included in this appendix:

■ “Configuring Internal or External Clocking” on page 30

■ “Building the Null Modem Cable” on page 30

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Sun-microsystems Sun PCI High Speed Quad Port Serial Interface Adap Manuel d'utilisateur Page 49