end office switch


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end office switch

A telephone central office switch that connects directly to the customer. Also called a "Class 5 switch" or "TDM switch," an end office switch is a computer specialized for TDM-based, circuit-switched telephone calls. It handles services such as call forwarding and call waiting. Such switches are typically from Lucent and Nortel Networks (see ESS and DMS).

Most of the call recording and billing is also performed in Class 5 end office switches, whereas in the past, it was handled in Class 4 tandem switches. Local telephone companies use both end office and tandem switches, which may be the exact same hardware with services differentiated only by software. See tandem switch.




References in periodicals archive ?
The system is based on a switch-on-a-card design through which each interface card (or circuit pack) performs all of the functions required of an end office switch.
As a true end office switch alternative to traditional Class 5 switches, the OCX is based on an open, scalable architecture, and is targeted towards Competitive Local Exchange Carriers (CLECs) and Independent Telephone Operating Companies (ITOCs).
Ariel's new SS7-enabled network access system bypasses the end office switch by enabling carriers to connect ISPs to the PSTN via Inter Machine Trunks (IMTs) rather than PRIs.
For example, by locating multiple NAS units at each CO, all controlled by a single SSG, carriers can pick up incoming calls at the originating switch and bypass not only the end office switch, but the rest of the circuit switched network.