Reference Guide

ZCOM Tables and Data Structures
Interface Table
Chapter 388
ITXLSTX - Express transmit list headers (zptl_type)
This field is an array of list headers for the express transmit requests
associated with each port or subchannel of the Mux card. Each list
header represents the head of a linked list of PTTs that have pending
express transmit requests waiting to be sent to the Mux card. The list
linkage is maintained through the PTTXLX pointer in each physical
terminal table. The express transmit requests themselves are linked to
the queue maintained by the PTTXQX field in each PTT. The structure of
the list header is shown below. There is one copy of this list header for
each port or subchannel on the Mux interface.
ITXLSTA - High priority transmit list headers (zptl_type)
This field is an array of list headers for the high priority transmit
requests associated with each port or subchannel of the Mux card. Each
list header represents the head of a linked list of PTTs that have pending
high priority transmit requests waiting to be sent to the Mux card. The
list headers in this array function identically to ITXLSTX only for the
high priority transmit requests. A terminal may be linked to ITXLSTX,
ITXLSTA and ITXLSTB all at the same time, if it has express, high, and
low priority transmit requests in progress.
ITXLSTB - Low priority transmit list headers (zptl_type)
Table 3-18 ITXLSTX Express Transmit List Headers
Field Name Field Description Field Type
Size
(Bytes)
nextl Pointer to next active TX list pointer 8
prevl Pointer to previous active Tx list pointer 8
tmcount Number of terminals in the list uns.short 2
subchn Subchannel number of this list uns.char 1
spare1 Reserved, unused char 1
spare2 Reserved, unused int 4
tmhead Pointer to 1st terminal table in list pointer 8
tmtail Pointer to last terminal table in list pointer 8