PMDF System Manager's Guide

When the pager channel finds one or more modems to be unusable, it will note the device names.

On OpenVMS, these device names are sent via an OPCOM broadcast to all operator classes, or if the site-supplied command procedure PMDF_COM:bad_modem_alert.com exists, that command procedure is instead executed. This site-supplied command procedure bad_modem_alert.com can obtain the list of bad modems from the DCL symbol PMDF_BAD_MODEMS. The value of that symbol is a comma separated list of the bad device names. The name of the currently running channel can be obtained from the OpenVMS logical PMDF_CHANNEL.

On UNIX, these device names are written to a file /tmp/pmdf_bad_modem-uniqueid, where uniqueid is a unique string generated to disambiguify the file name. In addition, if a site-supplied /pmdf/bin/bad_modem_alert shell script exists, it will be executed, and the bad modem device names will be supplied to it via standard input, stdin.

On NT, these device names are written to a file C:\tmp\pmdf_bad_modem-uniqueid, where uniqueid is a unique string generated to disambiguify the file name. In addition, if a site-supplied C:\pmdf\bin/bad_modem_alert shell script exists, it will be executed, and the bad modem device names will be supplied to it via standard input, On UNIX, these device names are written to a file /tmp/pmdf_bad_modem-uniqueid, where uniqueid is a unique string generated to disambiguify the file name. In addition, if a site-supplied /pmdf/bin/bad_modem_alert shell script exists, it will be executed, and the bad modem device names will be supplied to it via standard input, stdin.