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G&R

The X.25 handler

You start the X.25 handler (gl_x25) when you specify -li x25 as the line

handler for a Host Links product. It is only available for the UNIX/Linux

version of Host Links, and only on some of the platforms.

Making connections using X25

Accepting a connect

The X25 handler by default does not accept connections because the ‘outgoing

only’ parameter (-OO) is by default ON. If it is set OFF products and

applications receiving connections can use the handler.

Note that the local sub-address parameter, the local user data parameter or both

must be given at startup in the command line or configuration file to take effect

and direct incoming calls to the correct product. You can start two products on

the same or two different systems and then connect from either to the other to

establish interactive communication between two terminals or applications.

Issuing a connect

X25 connections are always two-way simultaneous. Any concept of ‘turn’ to

determine who may send data must be implemented in the applications. The

handler recognizes the X.25 ‘more data’ flag, and packets with this flag are

delivered as enclosure ‘none’. It delivers the terminating packet without the flag

with enclosure ‘end of group’, and this may be interpreted as ‘turn’.

Service messages

The X25 handler accepts service messages for connect ($*$CN), disconnect

($*$DIS) and break ($*$BRK) from the communications product using the

handler. You can type them and transmit when using an emulator or concen-

trator.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Installationshandbuch Seite 63