An important element in the status-table data structure is the variable gfxStatus. Bits in this field are shown in Error! Reference source not found.. The first four bits reveal the fax channel shutdown states, which are an extension of the shutdown status.
The term "shutdown" describes some options that are set with the GFXSHUTDOWN command. For example, the shutdown option 0 means that a fax channel polls the Queue File Pending List for outgoing jobs and answers incoming calls. GFXSHUTDOWN 2 tells the channel to stop transmitting, although it still can receive. That is a useful arrangement in a multi-fax channel chassis in which some fax channels are dedicated to transmitting and others to receiving. An operator who wished to confirm that a channel is only receiving, and not sending, would expect bit 1 of gfxStatus to be turned on. Bits 4 to 9 of gfxStatus are the capabilities flags, which list the receive and transmission options that have been enabled.
The last six bits of gfxStatus are read-only. By monitoring the gfxStatus bits within the status table in memory, an application can show when each channel is receiving, sending, on-line, off-hook, or ringing.
Figure 6. Bits in the gfxStatus Field
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