Terminal-Definition

Each HDLC/LAP-D Mux channel requires one (and only one) Terminal-Definition for the HDLC/LAP-D point-to-point link. The LAP-D terminal is defined by a Terminal-Definition line in the ZCOM network answer file (-.answ).

Some sample HDLC/LAP-D Terminal-Definition lines for the Z7300A card follow:

Term  120    1:6:3 LAPD.DLE     HDLC_DTE_400MS     1030 0 0 0 0 "HDLC link 1"
Option 0000h 0008h
Term  120    1:6:3 LAPD.DLE     8080H 146AH        1030 0 0 0 0 "HDLC link 1"
Option 0000h 0008h

The first example above is a Terminal-Definition that defines an HDLC/LAP-D terminal with ZLU 120 on card 1 port 6 subchannel 3. It is configured as a DTE (user side) with frame time-out value of 400 milliseconds. The first OPTION word configures the idle line timer to the default value. The second OPTION word defines the SAPI and TEI. The second definition is the same as the first except that it uses the POLL and SELECT words to define the mode of operation. When the POLL and SELECT values are used they are specified as two 16 bit hex values.




	NOTE: This is "non-standard" hexadecimal notation.

The descriptions of the fields within these values are described below under Poll/Select/Option Configuration Values.

The Terminal-Definition takes the following format:

Term  zlu  mux:port:subc dtype poll select 
              appl_no inst_no brch_no wkst_no area_no name <option>

More specific information on the parameters in the HDLC/LAP-D Terminal-Definition follows.

ZLU

This number (120 in the example) assigns a unique reference number for this terminal.

mux:port:subc

The port assigned must be configured as above and the ACC card must have the appropriate HDLC/LAP-D firmware configured. You must also have defined the subchannel number in the Subchannel definition section.

dtype

The device type of the HDLC/LAP-D terminal must be LAPD.DLE.

poll/select

This supplies the "POLL" and "SELECT" parameters for the ZCOM Terminal-Definition. These are used to specify:

whether the HDLC/LAP-D terminal acts as a DTE (user side) or DCE (network side),
the frame re-transmission time-out value,
the re-transmission count limit,
the outstanding frame window size to be used, and
the maximum frame size allowed.

In most cases a pre-configured keyword will suffice. For the list of currently predefined keywords, see "Predefined Configuration Values" section of this chapter. If a different set of values is required, then different values for the "POLL" and "SELECT" codes may be entered here in the standard poll and select format in hexadecimal. For the format of these words, see “Poll/Select/Option Configuration Values”.

appl_no

Application number (Application dependent - has no effect on protocol).

inst_no

Institution number (Application dependent - has no effect on protocol).

brch_no

Branch number (Application dependent - has no effect on protocol).

wkst_no

Workstation number (Application dependent - has no effect on protocol).

area_no

Area number (Application dependent - has no effect on protocol).

The five parameters above are for the use of the application and can be set to any value desired. They can be accessed by the application from the Logical Terminal Table using ZINFO().

name

Choose a meaningful description of the LAP-D link, preferably including a reference to the location of the remote end of the link. This field will be used in some ZMNTR displays. It may also be accessed programmatically using the ZINFO call.

options

This configuration keyword supplies the "OPTION" parameters for the ZCOM Terminal-Definition. These are used to specify:

the idle line time-out value,
outstanding frame window sizes larger than seven, and
the SAPI and TEI.

Terminal-Definition

Technical documentation

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