urgentcomm » SMT

Data above voice systems

Published Wednesday, October 01, 2003

In the last 20 years, long-haul transmission networks were upgraded to transport digital signals due to the huge growth of the information technology market (metropolitan-area networks, interconnection of local-area networks, the Internet, digital cellular networks like GSM or CDMA, digital trunking networks like iDEN, etc). Originally, the long-haul transmission network was designed to transport analog signals using mainly high-capacity long-distance FDM-FM analog microwave radios (Frequency Division Multiplexing/Frequency Modulation). This equipment is suited to transport voice signals from analog telephone multiplexers (it cannot transport digital signals directly). Digital microwave radios are adequate to transport digital signals, however, analog microwave ...

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