Point of Presence
A point of presence (POP) is a node within a communication system that establishes the connections between two or more communication networks. A traditional example of a point of presence is the central office , which acts as a connection between local telephone lines and the trunk lines.
With a local exchange, the point of presence enables the end user to initiate a telephone call by forwarding the signal to the trunk line via the local exchange. Thanks to the Point of Presence, the signal is able to reach its destination, and feedback confirms the successful connection so that voice communication can take place.
Further examples are the access point to the Internet at the Internet provider or the node between a local communications network operator and an operator for a long-distance network. At the point of presence, the connections for data and voice traffic are brought together by the various exchanges. Here they are processed for adaptation to the respective transmission media and their data rates and for routing, passed to the local and long-distance exchanges or passed on to other telecommunications service providers .
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