Digital ESS vs Analog ESS
Analog ESS perform line and/or trunk connections that are in analog form when they pass through the switch while the Digital ESS connects lines and/or trunk circuits that convert the analog signals into digital form when they pass through the switch.The digital ESS is more efficient than the analog ESS because it has electronic components that are more reliable, less expensive, and faster than the electro-mechanical devices used in the analog ESS. It requires conversion of analog lines to digital lines only at end offices. It handles more complex signaling data, which increases the processing speed and provides more customer services. It directly accommodates signals for many services, such as fax, video and data transfer. It is designed in a flexible, modular manner that can be easily expanded or modified.
Signaling is the common language by which switching machines communicate. In addition to transmitting information, telephone networks also transmit control signals. These signals are transmitted between network control devices, which enable them to set up, disconnect and control the transmissions. Many such supervisory signals are needed to set up a call through a complex network. There are three classes of signaling that are frequently used - Altering Indicators which inform the customer of call-processing conditions, Inter-office Trunk Signals which are used to exchange information between switching machines and special Services Signals which enable custom telephone features to be implemented by pressing pre defined keys on the telephone set.
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