Eicon Networks S93 Installationsanleitung PDF herunterladen (Seite 72)

Using Shorthold Mode 72

CHAPTER 6

Using Shorthold Mode

During data exchange between computers, there are always idle periods. If the connection

continues during these periods, unnecessary charges will be incurred.

The shorthold mode reduces these charges. It breaks the physical connection during

periods where no transmission takes place and only reconnects to the remote station

when data needs to be transmitted. Therefore, the physical connection over the ISDN or

channelized T1 line is established only during actual data transmission. The shorthold is

not displayed in the data transmission monitor.

The Diva Server for Windows NT shorthold is an Eicon WAN-Miniport option and therefore

only functions between two computers equipped with Eicon ISDN adapters.

Note: The shorthold mode can only be used efficiently with straight TCP/IP connections.

Other protocols send regular broadcasts, with the result that no periods are really

transmission-free. The autonomous data compression in the Windows NT RAS does not

provide a mechanism to filter out these broadcasts.

When using shorthold, make sure to deactivate the autodisconnect in the RAS (standard

setting 20 min). Or set the value so high (e.g. at 1000 min) that the connection cannot be

broken while the computer is in shorthold mode. The ‘RAS Autodisconnect’ is set in the

Windows NT registry under:

HKEY_LOCAL_MACHINE\SYSTEM\CURRENTCONTROLSET\SERVICES

\REMOTEACCESS\PARAMETERS

To deactivate, set the value of ‘Autodisconnect’ to 0.

Breaking and re-establishing connections

Shorthold is activated and configured during configuration of the Eicon WAN-Miniport

driver (see Shorthold Settings

on page 31).

To enable shorthold mode, the option ‘Shorthold Mode’ must be selected by both sides.

The value in seconds after which a shorthold should be initiated must be entered for

‘Shorthold Time (sec)’.

Only one side can initiate and reestablish a shorthold at any time. The other side should

set a ‘0’ as ‘Shorthold Time (sec)’.

Once the specified shorthold time has expired, the side that controls the shorthold breaks

the connection. When it needs to send new data, it will reestablish the connection.

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Eicon Networks S93 Installationsanleitung Seite 72