Group 13 has consented a new Recommendation that will give support for a widely
deployed network technology in IP-based NGNs.
The Recommendation Y.1453 addresses required functions for
network interworking between time division multiplexing (TDM) and IP networks.
TDM is a way to transmit multiple subscribers’ calls along
the same transmission medium at the same time. Given that is a very widely used
technology in existing telecommunications networks its continued support in NGN
Y.1453 addresses "user plane internetworking
mechanisms, connection multiplexing and procedures (for interworking)".