Choke exchange

From Wikipedia, the free encyclopedia
Jump to: navigation, search

A choke exchange is a telephone exchange designed to limit the effect of high numbers of simultaneous call attempts to that exchange. Typical phone numbers on choke exchanges include radio station talk radio caller and contest lines[1] and event ticket vendors.

The choke exchange is connected to other exchanges in such a way that even high call volume will be handled through the choke connection rather than overwhelming the rest of the local telephone network. Other local exchanges have a limited number of direct trunks (junctions) to the choke exchange, which may only serve one or more customers like a radio station contest line, which may experience a large number of simultaneous calls. But instead of calls being overflowed to main or tandem routes shared with other calls, the unsuccessful callers receive the reorder tone from their local or local tandem exchange. If the calls were overflowed to the tandem route, the caller would receive busy tone from the exchange serving the radio station, and the sudden peak would disrupt calls between other customers.

With common-channel signaling (CCS), like Signalling System No. 7, separate choke exchanges may not be required for these customers.

Examples of choke exchanges in North America have included:

See also[edit]

References[edit]