What is "35b supervectoring"?

At least since the announcement of the FRITZ!Box 7590 at CeBIT 2017, the term supervectoring has appeared ever more often. Reason enough to explore this technology in the guide: How should supervectoring be classified? How is it different from former technologies? What are its advantages?

A new DSL standard

35b supervectoring is the latest development of the VDSL standard. Alternative terms for it are VDSL Annex Q, Vectoring, and V Plus.

So far these DSL profiles are used: 8a, 8b, 12a, 12b, 17a, 17b and 30a, with 17a being the most used by providers. These designations are defined by the frequency range used (0-8 MHz for the profiles starting with 8, 17 MHz for the one starting with 17, and so on). The fact that this technology is built on existing DSL architecture is a great advantage for network providers, as most of the data transmission can continue on the copper cable network. Only the distribution stations, known as DSLAMs (Digital Subscriber Line Access Multiplexer), need to be updated.  From a single DSLAM source, network providers can offer 35b supervectoring in parallel to ADSL, ADSL+, VDSL2 (for example DTAG 50 Mbit/s) and existing vectoring technology (100/40 Mbit/s). This allows for speeds of up to 300 Mbit/s over a short distance (up to 300 m to the DSLAM).

Download up to 300 Mbit/s

All forms of DSL require participants in a cable bundle to share bandwidth. The more people in a cable bundle who are supposed to receive high data rates at the same time, the less the bandwidth available for each user. A solution is known as "vectoring". It reduces the mutual interference of adjacent copper twin wires within a cable. This procedure requires high processing power from the DSLAMs, since the system has to calculate the interference on every single copper twin wire in a bundle. During the process two signals are sent to the respective twin wire; the actual message signal and a counter signal, which is generated by the calculated interference. This practically eliminates interference signals caused by crosstalk. While this does not increase connection speeds, it does allow multiple fast connections on the same cable bundle concurrently, providing for reliable rates of 100 Mbit/s.

Supervectoring is the next step, using more frequency ranges than ever, to make even greater bandwidths possible (300 Mbit/s download, 50 Mbit/s upload).

All you need – besides a corresponding rate from your Internet provider – is a compatible router like the FRITZ!Box 7590.