ZCOM Tables and Data Structures
Interface Table
Figure
15 14 13 12 
11 10 9 8 7 
6 5 4 3 2 1 
0
AC ST NB PA
AC - Driver currently active
ST - Card has sent status transfer request ($STDT)
NB - Driver cannot get any free system buffers
PA - Pause after current event
ITCNTR - Interface terminal counter
The terminal counter is the actual number of terminals defined on this Mux interface card.
IFRTRY - Reset retry count
This is used to count the number of times the Mux interface has been reset due to a backplane timeout, or firmware failure. It is incremented by ZMON each time the Mux card is reset by a request from the DAM. If it reaches an unsatisfactory level, the Mux card will be disabled (set down) by ZMON.
The driver will decrement the retry count if it is not zero after every 30 successful status $STDT replies (i.e., every 5 minutes). If an unstable Mux interface fails and restarts too often, the ZCOM subsystem will mark it as “down” and stop using it.
IRSERR - Restart error count
This field contains the count of the number of errors which occurred during the last restart or enable. These errors are due to $PORT or $TERM commands and will be separately reported to ZMON. This field is kept for information purposes only.
IFSTCN - Status update request count
This counts the number of $STDT replies until IFRTRY will be decremented.
INTFNO - Interface card number
This is the interface number that was specified in the Mux statement of the TTGEN configuration file.
IMAXPORTS - Maximum number of ports on card.
82 | Chapter 3 |