Hello, everyone!
Today, I would like to share with you an article on DSL - FTTB networks.
The major benefit of the FTTB network (Figure 1) over the DSL network (4.1) is that the transmission medium between the Ethernet switch and the subscriber's premises (a flat in an apartment building) is a new Category 5, 6, or 7 unshielded twisted-pair (UTP) data cable, fitted according to local area network (LAN) standards.
Figure 1. FTTx broadband access networks in their most basic form.
The usage of dedicated LAN connections with lengths limited to 100 m and rated performance up to 100 MHz (Cat. 5) or even 600 MHz (Cat. 7) overcomes the constraints of DSL systems, allowing for symmetrical services of 100 Mb/s and 1 Gb/s.
There's no need for separate NTdevices because this functionality is included into all PCs, laptops, routers, TV sets, and other devices, at least at a 100 Mb/s bit rate.
Table 1. A comparison of DSL systems that are now in use.
How much of a difference do LAN cables make? Cat. 7A cable has a practical bandwidth of 1200 MHz at lengths up to 100 m and supports a 10 Gb/s bit rate, whereas Cat. 8 cable has a bandwidth of 2 GHz and is intended to handle 40 Gb/s applications at 30 m cable length.
The G.fast system (Table 1), which has a similar reach, utilizes 106 MHz of bandwidth and achieves 1 Gb/s, resulting in a 40:1 difference in possible data rate.
Figure 2. Residential clients get the best download rates.
FTTB technology can provide 10 Gb/s services at minimal cost, assuming a 100 m reach and the ability to wire all apartments in a 15-story building to one technical room.
If the demand pattern depicted in Figure 2 continues, this is competitive with other FTTH technologies and will be enough to meet consumer requests for another decade.
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