@fibresystemsmag |
www.fibre-systems.com
FEATURE MOBILE FRONTHAUL
A traditional base station: with mobile fronthaul, the amount of equipment is dramatically reduced In the case of a cell with LTE carrier
spectrum of 5MHz and 2x2 MIMO antenna configuration, the maximum data throughput is only 37.5Mb/s. So, theoretically, a backhaul network with 37.5 Mb/s should be able to handle the traffic. However, a CPRI link requires a bandwidth as high as 614 Mb/s. Tis is Option 1 in the CPRI standard and everything scales as a multiple of that. With LTE carrier bandwidth of 20MHz and an 8x8 MIMO antenna, it now needs 9.8Gb/s on the CPRI link. While the requirements are fairly complex,
the optical transceivers required to implement them are not. ‘Tere’s not a lot there as far as whizz bang technology is concerned,’ said Lively. ‘Te optics are pretty standard.’ He continued: ‘When vendors got together
to define the CPRI standard, the basic requirement was that it should support a 10km link, that it would use SFP, SFP+ form factors and use QAM [quadrature amplitude modulation] for data processing. Tey then went on to say that these requirements could be met by a variety of existing products and list Fibre Channel, InfiniBand and Ethernet
transceivers. Tey deliberately did not define the need for new devices.’ Of course, that means it is not possible to
tell which end application the transceiver is intended for from a basic product description. However, vendors give LightCounting quite a bit of detail on their shipment data, and they can usually tell how the transceiver will be deployed by who placed the order, the analyst firm says. LightCounting’s research reveals that today
the majority of the fronthaul market is made up of simple point-to-point fibre links using
Issue 6 • Winter 2015 FIBRE SYSTEMS 23
Jan Jirous /
Shutterstock.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37