(B-ISDN, Broadband ISDN) A single network capable of carrying several different types of service, based onvoice, data, still or moving image - by means of digital transmission techniques. The ISDN (Integrated Services Digital Network) currently being deployed in Europe carries a communication of up to 2 Megabits/second (Narrowband ISDN). Future networks will carry higher speed communications (Broadband ISDN).