10BaseS
10BaseS , 10BaseS or Long Reach Ethernet is the name for a proprietary data transmission technology, the data transfer rate of 10 Mbit / s (10Base) over an ordinary telephone line ( S reaches ubscriber line). It was mainly marketed by Infineon until 2003 and had not found widespread use outside of Asia.
Background of the development
At the time 10BaseS was developed, the most common cabling in networks was coaxial cable and Cat. 5 , whereby coaxial cable was no longer recommended for new installations.
In most cases, data was transmitted over these cables using the Ethernet protocol as 10BASE2 (coax) or 10BASE-T. The transmission rate was usually 10 Mbit / s, whereby the cable length was limited to 100 m ( 10BASE-T ) to 185 m ( 10BASE2 ) depending on the standard used .
It was difficult to connect networks that were physically more than 100 m away. If DSL was used, the data rates achieved were far removed from those of the connected networks. If value was placed on the full data rate, a 10BASE-x line had to be laid and (in the case of copper cables) repeater stations had to be operated, which drove up the price of such a line.
Two-wire telephone lines, on the other hand, were mostly available and could easily be connected in an exchange.
The motivation for the development of 10BaseS was therefore to be able to transmit the full data rate of a 10 Mbit / s Ethernet over existing lines.
technical features
As the name suggests, there is a similarity to 10BASE-T in terms of technical features. Like 10BASE-T, 10BaseS enables a transparent point-to-point connection for the transmission of Ethernet packets via copper cables. Instead of twisted pair cables , however, an ordinary telephone line is used, which according to the specification can be up to 1,200 m long.
A separate frequency band is used for data transmission for each transmission direction. The frequency bands are selected so that conventional voice calls ( POTS ) can also be made over the same line . As with DSL, quadrature amplitude modulation (QAM) is used as the modulation method. A maximum symmetrical data rate of gross 13/13 Mbit / s (net 10/10 Mbit / s) is achieved via copper wire pairs .
In most implementations of 10BaseS, a splitter is already integrated in the modem, so that no separate components are necessary as in the early days of DSL.
Further information
10BaseS was introduced by Infineon in 2000 at the SuperComm 2000 conference in Atlanta. The technology was developed by the Israeli company Savan Communications Ltd. which was completely taken over by Infineon in April 2000.
10BaseS was mainly used in Asia. In the meantime, it is being replaced more and more by VDSL , in particular by VDSL2, which offers higher data rates and is more widespread.
Cisco sold solutions based on 10BaseS under the name Long Reach Ethernet .
Savan Communications worked with 3Com to develop 10BaseS . The patents that 3Com applied for on the technology were sold to Infineon in 2003. 10BaseS has been registered with the OHIM for Infineon Technologies AG as a European community trademark since May 21, 2002 . (Number 001711712)
Web links
- 10BaseS: Ethernet transport over standard twisted pair wire (PDF, 634 kB, English)
- On tour with VDSL - where is the development today, where is it going? (PDF, 323 kB)