PMDF System Manager's Guide

When the G3_TO_FAX or FAX_TO_DATA channel finds one or more modems to be unusable, it will note the device names either via an OPCOM broadcast to all operator classes, or, if the site-supplied command procedure PMDF_COM:bad_modem_alert.com exists, by executing it. That command procedure 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 may be obtained from the logical PMDF_CHANNEL.