Labels:text | electronics | screenshot | display OCR: ISSUE #1 Telecommunications in the near future Page no. 02 Telecommunications in the near future By Count Zero The future of telecommunications in Britain will see the emergence of two exchanges, fundamentally different systems. One Okay, I hear you ask, exactly what is ISDh and will it be any better than system will be have evolved, and is evolving at the present time, from the the present system? Digital fibre existing British Telecom network, this optic cables have immense advantages will be the ISDn system, The other over co-axial copper cable, but chiefly there are two reasons why, system will be the Most advanced of its kind and will exist Bandwidth is a Measure of the can be nowhere else on the world, this will system capacity of information that be the PCn system. carried, for instance your phone has a ISOn is an acronym ( stands for ) bandwidth of 3, 100 hz, this Means that Intergrated Services Digital network, the frequency of the signal can be and is being developed by BT. ISDN will varied 3,100 times per second ( This replace BT's ageing network of clock- Method is called Frequency Modulation work exchanges, and co-axial telephone or FM). In theory this means you could lines, BT says that it will have a only transmit 3,100 Bits Per Second, complete digital network by the Middle but ModeMs achieve a much higher rate of the next decade, around the year by using another Method of Modulation 1995, assuming the present rate of in addition, called phase Modulation, upgrading continues. At present this Although the coaxial copper cable used is the replacing of two old exchanges for phone lines can carry More, it is with digital ones, every day, but bear not needed for voice grade trans- in Mind BT has around 6, 000 telephone Mission where 3,100 hz acceptable quality, provides
