ACC Programmer's Reference Guide

Chapter 3 53
ZCOM Tables and Data Structures
ZCOM Header Structure
ETPLIM- Default E1/T1 IFT port TX limit (bytes)
This field contains the limit (in bytes) of all unacknowledged transmit
messages to t erminal ZLUs belonging to the same port and subchannelof
an E1/T1 card. Each E1/T1 card has approximately 16 M-bytes of buffer
space available for both internal use and transmit requests. If the DAM
issues a transmit request to the E1/T1 ca rd and the card does not have
enough free buffers to hold the request data, the Mux will reject the
requestwithan“out of buffers” error. The DAM will retry t he request
after an unacknowledged transmit request completes. This field is used
to minimize the number of retries (and thereby increase overall
performance) by imposing a limit on the size of unacknowledged
transmit requests. T his value is configured through the E1T1-Port-Limit
parameter in the TTGEN configuration file and is used t o initialize the
individual port and subchannel limit array iplimit[] kept in the interface
table (zift_type).
HOSTYPE -Typeofoperatingsystem
This field indicates the type of operating system that manipulates the
data structures. The allowed values are 0, 32 (32-bit kernel) or 64 (64-bit
kernel). It is first set up by TTGEN to 0. Then it is set to 32 or 64 by
ZMON when it initializes the ZCOM kernel memory block.