Page 690 - 5G Basics - Core Network Aspects

2 Transport aspects

the ITU-T G.993.2 generic application reference model for splitterless remote deployment (see Figure 5-5 of
[b-ITU-T G.993.2]). The DPU may contain one or multiple instantiations of the FTU-O and service splitter
functionalities.

Figure 5-4 – Application reference model for FTTdp with POTS

Table 5-1 – Signal flows applicable at the reference points shown in Figure 5-4

Reference point ITU-T G.9701 signals Reverse power feeding Conventional analogue POTS

U-O2 Yes No No

U-O /U-R Yes No Yes
U-R2 Yes No No

The customer self-install feature facilitates rapid deployment of ITU-T G.9701 equipment since it does not
require installation of new wires in the customer premises. The ITU-T G.9701 equipment is connected using
existing telephone wires, where the ITU-T G.9701 NT1 can be plugged into any telephone wall socket. This
deployment model implies that the wiring topology of the existing network may include bridged taps. This
Recommendation thus defines the functionality necessary to facilitate deployment of ITU-T G.9701
equipment in the presence of bridged taps and related radio frequency interference (RFI) and impulse
noise.

As the DPU is deployed closer to the customer premises, the number of ports on a DPU gets smaller and
more DPUs are deployed throughout the network. Distribution points are at locations where local power is
typically not available. In this case, reverse powering is applied. The DPU is powered from the customer
premises, sharing the same wire-pair with the data service. The application of reverse powering is included
in the application reference model for FTTdp with reverse powering and POTS in Figure 5-5.

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