Page "V5 interface" Paragraph 14

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.