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Speed with 2 NT networks connected by ISDN
Message
De
12/08/1999 13:22:52
Bruno Di Lalla
Bdl Computer Consulting
Greely, Ontario, Canada
 
Information générale
Forum:
Visual FoxPro
Catégorie:
FoxPro 2.x
Divers
Thread ID:
00247415
Message ID:
00253098
Vues:
40
>Hi Gerard. I just looked up the speed of ISDN.
>
>Normal: 128kps
>Broadband: 2mbps
>
>The best way to determine this is to test it under normal network load (with all the other apps using it). I would say that 128kbps is most definitely far too slow and won't be usuable. 2mbps should be fast enough, depending what else is using the connection.
>
>Other options if the line is too slow.
>- use remote control like pcanywhere (need extra pcs for remote users)
>- use citrix (like pcanywhere but the sessions run off of the remote server). Can be quite expensive
>- use a backend server like sql server and only send the necessary data over the wire. You will have to rewrite your app.
>- create a server in VFP that runs on NT server to respond to data requests
>
>Each of these options requires time and/or money to implement.
>
>Others may have more/better ideas.
>
I noticed one of your recommendations was to use citrix. In principle, this is a good idea. However, there is a major problem with Foxpro 2.6 and citrix. I've seen a Foxpro 2.6 application running with the use of Citrix Metaframe and it seems that simply pressing the tab key to go to the next field causes the entire window to refresh. It also seems to refresh as if the entire window was a bitmap! My only explanation for this behavior is that Foxpro 2.6 is not using native Windows calls for the creation of its GUI. This causes Metaframe to send the window as a bitmap, pixel by pixel.

I expect Visual Foxpro would have resolved this issue, however, I never had the chance to perform further tests.

Regards,
Bruno Di Lalla
Consultant
BDL Computer Consulting
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