Disconnected form internet when printing

[The MerceD 0]

I have one small problem.

If I´m connected to the internet and start to print, ithe internet connection is disconnected.

 

I have ISDN and use the ZyXel imni.net plus and my printer is a HP DeskJet 720C.

 

Any ideas?

 

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The MerceD has you...

 

Sys spec:

P2-350

128RAM

Voodoo3 2000

SB AWE 64 Gold

10GB HD

Win2k 2195