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 terminal ZLUs belonging to the same port and subchannel of 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 card and the card does not have enough free buffers to hold the request data, the Mux will reject the request with an “out of buffers” error. The DAM will retry the 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. This value is configured through the E1T1-Port-Limitparameter in the TTGEN configuration file and is used to initialize the individual port and subchannel limit array iplimit[] kept in the interface table (zift_type).
HOSTYPE - Type of operating system
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.