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G&R

Establish the physical connections

X25 connections

For a public X25 connection simply connect the appropriate cables to the X25

DCEs. Most DCEs have LEDs that indicate the state of the link. In most cases

the link will be opened when the Host Links platform is started (i.e. before any

connections take place).

For a private X25 connection, you can use a crossed cable (sometimes referred

to as a W8 cable) where the output signals from the Host Links side are used to

provide input signals for the host side. In this case one of the machines (and

only one) must provide clock signals. Otherwise you need a pair of modem

eliminator units (often referred to as MMEs).

Ethernet LAN connections

Connect the LAN adapters to the appropriate LAN segments, if necessary using

media converters, tranceivers etc. etc.

FDDI LAN connection

Connect the FDDI adapter to the FDDI concentrator (either directly to a

MainWay LAN Extender or some other external concentrator).

Test the connections

Make sure the configuration changes described above have been activated. The

DSA configuration file on the Host Links system must be compiled. The

system may need to be rebooted.

An external communications line analyzer tool (Sniffer or equivalent) is

invaluable if you meet serious networking problems. However there are

software tools that may help you analyze most problems.

Mainframe/FEP tools.

The availability of useful tools will vary with the system type and software

version. Please check the mainframe documentation for information.

Most DSA systems have a Network Operator Interface (NOI) program. This is

a very useful tool when testing out connection problems.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Installationshandbuch Seite 78