Page 693 - 5G Basics - Core Network Aspects

Transport aspects 2

Figure 5-7 – Application reference model for FTTdp with reverse powering and derived POTS not sharing
the in-premises wiring with ITU-T G.9701

Table 5-4 – Signal flows applicable at the reference points shown in Figure 5-7

Reference point ITU-T G.9701 signals Reverse power feeding Conventional
analogue POTS
U-O2 Yes No No

U-O2P No Yes No
U-O/U-R Yes Yes No
U-R2P No Yes No
U-R2 Yes No No
The above application reference models all have voice service delivered over the in-premises wiring. Other
application models are possible, where voice service is provided from other devices, e.g., from the ATA with
digital enhanced cordless telecommunications (DECT) handsets, or by connecting VoIP telephones to the
home network.

The application reference models with reverse powering and (derived) POTS (Figures 5-5 and 5-6) show
that the access wire-pair and the in-premises wiring are shared by data service, voice service and reverse
powering. Figure 5-8 provides an overview of the electrical reference model. Depending on whether the
voice service is POTS or derived POTS, the FXO-type POTS adapter is in the DPU or in the customer
premises, respectively.

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