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It is a bundle of E1 interface links in V5.2 protocol. A V5.2 interface may use up to 16 E1 interface links. For analog access, the PSTN user port is converted into a functional part of the V5.2 protocol for signaling to the AN side. In principle, the V5.2 interface uses a concentrator type, whereby up to 16 E1 links, each carrying 30 channels (480 channels in all), may serve up to 1,920 subscribers with concentration. There is no limit in principle, to the number of V5.2 interfaces that can exist between the access network and the local exchange. A channel is allocated to a subscriber dynamically when he or she makes or receives a call.

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