ISDN . 

Integrated Services Digital Network:

A completely digital telephone/ telecomunications network for carrying voice, data, images and video at high speed by sending digitally-encoded signals.

 ISDN provides "end to end" digital service and can work on the copper wiring telephone lines that are in most homes and businesses today.
 

E-mail Genco now or call on (+44) 01488 657788 with your enquiry.  Either way we look forward to hear from you soon.