DLC_START_LS

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This section explains the ioctl subroutine argument structure for starting a link station.

The ioctl subroutine argument structure for starting a link station (dlc_sls_arg) has the following specifics:

  • These common link station flags are not supported:
    Item Description
    STAT Indicates a station type for SDLC.
    NEGO Indicates a negotiable station type for SDLC.
  • The raddr_name (remote address or name) field is used only for outgoing calls when the DLC_SLS_LSVC common link station flag is active.
  • The maxif (maximum I-field) length can be set to any value greater than 0. See the DLCETHER Frame Encapsulation figure (Figure 1) for supported byte lengths. The DLCETHER device manager adjusts this value to a maximum of 1493 bytes if set too large.
  • The rcv_wind (receive window) field can be set to any value between 1 and 127, inclusive. The recommended value is 127.
  • The xmit_wind (transmit window) field can be set to any value between 1 and 127, inclusive. The recommended value is 26.
  • The rsap (remote SAP) field can be set to any value except null SAP (0x00) or the name-discovery SAP (0xFC). Also, the low-order bit must be set to 0 (B`nnnnnnn0') to indicate an individual address.
  • The max_repoll field can be set to any value between 1 and 255, inclusive. The recommended value is 8.
  • The repoll_time field is defined in increments of 0.5 seconds and can be set to any value between 1 and 255, inclusive. The recommended value is 2, giving a time-out duration of 1 to 1.5 seconds.
  • The ack_time (acknowledgment time) field is defined in increments of 0.5 seconds and can be set to any value between 1 and 255, inclusive. The recommended value is 1, giving a time-out duration of 0.5 to 1 second.
  • The inact_time (inactivity time) field is defined in increments of 1 second, and can be set to any value between 1 and 255, inclusive. The recommended value is 48, giving a time-out duration of 48 to 48.5 seconds.
  • The force_time (force halt time) field is defined in increments of 1 second, and can be set to any value between 1 and 16383, inclusive. The recommended value is 120, giving a time-out duration of approximately 2 minutes.
  • No protocol-specific data area is required for the DLCETHER device manager to start a link station.