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G&R

Configuring the Host Links system

Configuring the transport stack

DSA is a session level protocol that runs over a transport stack. Traditionally

DSA ran over the OSI-transport stack and a LAN or WAN network. Today the

vast majority of networks are built of commodity products using the TCP/IP

communications stack. To facilitate use of existing OSI-based applications over

TCP/IP networks a ‘Request for comment’ (RFC1006) was submitted to the

Network Working Group that manages the introduction of Internet standards.

The RFC is entitled ‘ISO transport services on top of the TCP’ and has become

an Internet standard. DSA runs over RFC1006 and TCP/IP networks.

RFC1006 transport

MainWay front-ends with an ONP (Open Network Processor) have RFC1006

support in the standard product, allowing DSA sessions over TCP/IP into the

MainWay. RFC1006 can also be installed in the FCP7 and FCP8 cards to

support DSA connections direct to the hosts without passing through the front-

end. The GNSP communications processor of the later GCOS8 systems

supports RFC1006. The Later GCOS7 Diane systems also support RFC1006.

If you use the RFC1006 protocol rather than OSI-transport protocols, you don’t

need any further communications software or configuration of the transport

stack. We provide our own RFC1006 transport stack, which is controlled

completely from dsa.cfg. RFC1006 is an Internet standard protocol that

encapsulates an OSI-transport (TP0) protocol in TCP/IP frames. It is assumed

that TCP/IP is already installed on the Host Links platform.

OSI transport

If you do not have RFC1006 the DSA connections can be made in the

traditional way using OSI-transport, which is a requirement when connecting

via old-style Datanets. The UNIX supplier typically delivers the stack, but we

deliver the OSI stack on Windows NT/2000. The OSI stack must be installed

and configured before the G&R Host Links products can run.

Some OSI stacks require that the DSA node names (or TSAPs) and or the

network addresses of the local and remote DSA systems are configured for the

stack. Other stacks do not need any of these parameters. For a description of the

various OSI stacks and how to configure them please refer to the Host Links

Installation and configuration manuals for UNIX and Windows.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Installationshandbuch Seite 75