Subsequent Developments
Portions of V5 were re-used for a new service known as Narrowband Multimedia Delivery Service (or NMDS). In particular the PSTN protocol was re-used and combined with ISDN to provide a service to the subscriber. This allowed a digital connection to the subscribers house and the re-use of analogue phones across the digital connection. The AN reference point was replaced by an ISDN-like NTE. This NTE managed an analogue service and a basic rate ISDN service to the subscribers home.
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