Instructions

Description of the SHDSL permanent line modem
104275_en_c00 PHOENIX CONTACT 1-5
1.4 SHDSL technology
SHDSL (Symmetrical High-Speed Digital Subscriber Line) enables the same data transmis-
sion speeds for up and downstream via one or two double wires.
Data rates of up to 15.3 Mbps are possible per cable pair.
Figure 1 Dependency of the maximum SHDSL data rate (Mbps) on the line length for a
2-wire connection
Figure 1 illustrates the dependency of the maximum data rate on the line length with three
cable types. Higher data rates or longer distances can be achieved when high-quality ca-
bles with larger diameters are used.
Industrial SHDSL permanent line modems from Phoenix Contact support data rates of
32 kbps to 15.3 Mbps in 2-wire operation and data rates of up to 30 Mbps in 4-wire opera-
tion.
SHDSL permanent line modems are suitable for in-house cables, not for public telephone
networks.
The maximum possible transmission speed greatly depends on the cable length, the ca-
ble cross section, and the cable type.
10.0
8.0
6.0
4.0
2.0
0.0
0.0 2.0
km
4.0 6.0 8.0 10.0
SHDSL data rate [Mbps]
16.0
14.0
12.0
11.0
12.0 14.0 16.0 18.0 20.0
PE 1.4 mm (1.54 mm²)
PE 0.4 mm (0.13 mm²)
PE 0.9 mm (0.64 mm²)