EOC Classification Technology White Paper
As we all know, EOC (Ethernet over Coax) is one of the most popular technologies in the current two-way network transformation. It has become the "darling" of the two-way network transformation technology with its advantages of simplicity, stability, safety and low cost. At present, it can be divided into 10 categories according to its standard and non-standard. Among them, the standard ones are: baseband EOC, HPNA3.0, MoCA, coaxial WiFi and PLC; non-standard are: BIOC, UCLINK, Cable--BAS, EPCN and CabelRAN. This article has made a simple arrangement for these technologies for the reference of the industry.
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First, standard technology
1, MoCA technology
MoCA features:
Use frequency band 800MHz-1500MHz, select wiring below 1GHz
Each channel has a bandwidth of 50MHz, 15 channels are selectable, the physical layer rate is up to 270Mbps, and the data link layer rate is up to 130Mbps.
Adopt OFDM modulation, TDMA/TDD
MoCA advantages:
Alliance standard, high bandwidth, capable of large-scale applications in North America through branch distributors
MoCA disadvantages:
A single chip maker (Entropic), the price is still high, the product is not mature enough
The price of MOCA equipment has dropped rapidly, and there are more manufacturers.
MOCA application topology
2, (1) coaxial WI-FI technology
Coaxial WI-FI features:
Wi-Fi was originally an alias for IEEE802.11b radio access network
IEEE 802.11g operates at 2.400-2.482 GHz with OFDM modulation, physical layer transmission rate of 54 Mbps, data link layer speed
The rate is about 25Mbps.
The main problem with Wi-Fi is that the wireless signal is attenuated too quickly, and it can be effectively reduced by transmitting it over a coaxial cable.
Wi-Fi has two modes of frequency reduction and no frequency reduction through coaxial
It is worth noting that the preliminary standard for the new IEEE 802.11n has been passed. Ensure throughput of 108Mbps, up to 300Mbps.
Coaxial WI-FI advantages:
Full-standard application, mature equipment and low price
Coaxial WI-FI disadvantages:
Need to replace all branch distributors
(2) Down-conversion coaxial WI-FI technology
Down-conversion coaxial WI-FI features:
Reduce the frequency to 900MHz without replacing existing network equipment
Like MOCA, it is able to pass the splitter and cannot pass the amplifier
Since the bandwidth is lower than MOCA, to ensure bandwidth, the head end of a WIFI generally has 12 cable TV users, and one ONU has 4 WI-FI headends.
Downlink coaxial WI-FI advantages:
Mature technology and low price, it is the lowest cost of all active EOC technologies, and has the advantage of rolling investment compared with passive EOC.
Downsizing coaxial WI-FI disadvantages:
Down-conversion is a non-standard way, and different manufacturers' down-clocking chips cannot communicate with each other.
WI-FI application topology
3, HPNA3.0 technology
HPNA3.0 features:
Uses the frequency band 12MHz-28MHz, which is exactly the same as the existing cable TV network structure
Physical layer rate of 128Mbps, data link layer rate of up to 80Mbps
Using FDQAM modulation, 2-8 different frequency carriers are set on the frequency axis to transmit the same data at the same time, which is stronger than traditional QAM modulation and has better performance.
HPNA3.0 advantages:
ITU international standard, high bandwidth, capable of passing through the branch distributor, and also through the amplifier
HPNA3.0 disadvantages:
There are not many chip manufacturers, and the price is still high.
HPNA3.0 application topology
4, PLC technology
PLC features:
2001, HomePlug 1.0 14Mbps
In 2004, HomePlug Turbo 85Mbps
2005, HomePlug AV 200Mbps
Frequency band: 2 ~ 28MHz, OFDM modulation (84), maximum link attenuation of 60dB, strong anti-noise performance
Data link layer data rate is 30Mbps, HomePlugAV is up to 150Mbps
PLC advantages:
Mature technology, low price, alliance standard, IEEE standard is being developed, and anti-noise, anti-multipath
PLC disadvantages:
The 200M chip is still immature. The bandwidth of the 45M chip is only comparable to WI-FI. Recently, the 224M chip of the speed bit has been released.
PLC application topology
2, BIOC technology
BIOC features:
A technology introduced by Hangzhou Leiketong Company, a technology based on WIFI frequency reduction
BIOC advantages:
Lower cost, can be passed through the branch distributor, no need to change the existing network
BIOC disadvantages:
Non-standard technology, product application time is not long
Due to the limited distance of WI-FI technology transmission, Recco has introduced proprietary amplifiers, extenders and other equipment.
BIOC technology application topology
3, UCLINK technology
UCLINK features:
A new data access solution launched by Huawei, the system includes the following modules:
UC8001: Data access device: UC8001 is located between the user terminal and the aggregation device and is the network node of the UCLink integrated access system.
UC6201: Data User Terminal: Realizes the mutual transformation between RF data and standard Ethernet data.
UMIX data RF mixer: used to mix the data input and output signals of UC8001 with CATV RF signals and transmit them in the coaxial distribution network.
UJUMP data RF jumper: cross-connects the RF amplifier to ensure bidirectional transmission of UCLink data RF signals. The jumper is specifically divided into an overcurrent type and a non-overcurrent type.
Actual test results: UCLink actual transmission link attenuation is about 85dB (for field UC8001, this link refers to the test data between the hybrid port and UC6201, including the insertion loss of the mixer), consider certain The link margin (taken 5dB), so the actual attenuation link loss is taken as 80dB. If the line attenuation exceeds 80dB, it may cause the transmission rate of the UCLink system to drop or the terminal to drop.
In addition, the UCLink system supports line attenuation in the case of not exceeding Lmax, which can have a dynamic of 45 dB, that is, the range of the actual line attenuation L is allowed to vary: L = 35 dBi 80 dB.
UCLINK advantages:
Good network adaptability
For the existing CATV network, a simple two-way transformation, installation of the corresponding UCLink device, can achieve data access.
The cost per channel is lower than that of similar products, and the cost advantage is especially obvious when the user access rate is low.
The initial investment is small, the amount of engineering is small, and the business can be started quickly. In the case of rising user capacity, sustainable expansion will ensure the effectiveness of investment.
Can support broadband services
UCLINK disadvantages:
Weak business support, it is difficult to support triple play
Users share 10M, single-family broadband is less than 1M
Broadband demand is small, only simple broadband Internet service can be realized
Just a transitional technology
UCLINK schematic diagram for hub bridging scheme
4, CableRan technology
CableRan features:
An access solution introduced by Putian e Vision is a broadband access system built on a one-way cable television network. CableRan access
The components include the front-end small-end MAS, smart port I/O, and network management software.
Small "CMTS" with a coverage of 5km and a maximum access of 64 households
Downstream frequency band 40 ~ 80MHz, QAM256, up to 48Mbps
Downstream emission level: 50dbmV; receiving level: -10dbmV ~ 40dbmV
Upstream frequency band 5~36MHz, QPSK, QAM16, up to 12Mbps
Uplink emission level: maximum 48dbmV (adaptive) acceptance level: -10dbmV ~ 15dbmV
The front-end small-end MAS is a multi-mode access IP gateway device, which can restore the front-end device I/O to an IP signal, which is a device between the IP and RF conversion between the coaxial and IP interface parts. Each pre-MAS can support 64 port I/Os, which can be conveniently placed at a building or optical node. The smart port I/O device is a signal conversion device that restores the IP signal from the pre-MAS modulated on the coaxial cable to a standard Ethernet signal in the form of an RJ45 or USB interface.
Only the intelligent terminal I/O is needed to replace the existing ordinary set-top box, and another MAS small office is added between the trunk line and the building.
CableRan technology has an upstream bandwidth of 10 Mbit/s and a downstream bandwidth of 48 Mbit/s. It occupies the frequency range of 5~65MHz, of which 5~36MHz is used for uplink and 40~65MHz is for downlink frequency band. The downlink uses 16/64/256QAM modulation, and the uplink uses QPSK and 16QAM modulation.
CableRan networking diagram
These non-standard products have their own characteristics, do not have outstanding cost performance advantages, and there are more technical and commercial risks.
Third, the comparison of various EOC technologies
1, bandwidth comparison (data rate)
MOCA 130Mbps
HPNA3.0 80Mbps, 3.1 standard will be higher
PLC 30Mbps, Homeplug AV standard will be higher
WI-FI 25Mbps, 802.11n standard will be higher
BIOC 25Mbps
EPCN 10Mbps, the next generation will be higher
Baseband EOC 10Mbps
2, cost comparison
MOCA is the highest, but recent prices have fallen faster
HPNA3.0 is high
PLC medium
WI-FI is lower
BIOC price is not clear
EPCN price strategy is still unclear and product cost is low
Baseband EOC has a low price per line, but the hidden cost is relatively high
3. Comparison with existing networks
MOCA compatibility is better, can pass the branch distributor, but can not pass the amplifier
HPNA3.0 is the best compatible with branch distributors and amplifiers
PLC compatibility is better, can pass the branch distributor, but can not pass the amplifier
WI-FI down-converter products have better compatibility and can pass the branch splitter but cannot pass the amplifier
BIOC compatibility is better, can pass the branch distributor, but can not pass the amplifier
EPCN compatibility is better, can pass the branch distributor, but can not pass the amplifier
Baseband EOC is poorly compatible and cannot pass branch distributors and amplifiers
4, maturity comparison
MOCA is relatively mature and has large-scale applications in North America.
HPNA3.0 is relatively mature, with ITU standard support
PLC is mature in power line application, and applications in the field of broadcasting and television have just begun.
WI-FI products are very mature, but the application of the down-frequency part has just begun
BIOC launched in 2006, just started to apply in China
EPCN launched in 2007
Baseband EOC has some applications in China
to sum up
The dozens of EOC technologies above have their own merits on different levels. At present, these technologies are gradually maturing and widely used in various places. Although all the places are still in the state of asking for directions, there is no real standard to guide its development, but I believe that a mature and practical standard in the near future. Will appear.
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