Tip and Ring.
Standard "POTS" telephone line card;
Digital MPEG Television; and
As previously described one utility Network Interface Unit (NIU) adapter is required for each access network reaching the residence. In the 1997 timeframe, several access networks are expected to be capable (in principle) of providing multiple services (video, voice telephony, packet network access, etc.) over one network. As shown, the number of different NIUs required is quite extensive. The NIU is the sole termination for the access network to the Customer Premise Interface (CPI) adapters via the RG bus and vice versa. The NIU may be owned by the utility providing the access network service. Examples of NIU adapters include:
Standard POTS: analog using twisted pair;
ISDN: digital using twisted pair;