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Publish: 2021-04-25 05:46:45
1. 1. MOCA technology
features of MOCA:
use frequency band 800mhz-1500mhz, choose 1GHz below, convenient wiring
each channel bandwidth is 50MHz, 15 channels can be selected, physical layer rate can reach 270mbps, data link layer rate can reach 130mbps
use OFDM molation, TDMA / TDD
advantages of MOCA:
alliance standard, high bandwidth, can pass through branch distributor, In North America, MOCA has a large scale of application, but its disadvantages are as follows:
the price of a single chip manufacturer is still on the high side, and its procts are not mature enough.
the price of MOCA equipment drops rapidly, and there are more manufacturers.
MOCA application topology
2 (1) Coaxial Wi-Fi technology
features of coaxial Wi-Fi:
Wi Fi was originally the alias of IEEE802.11b wireless access network
IEEE 802.11g works at 2.400-2.482ghz, adopts OFDM molation, the physical layer transmission rate is 54Mbps, and the data link layer speed is about 25mbps
the main problem of using Wi Fi is that the wireless signal decays too fast, and transmitting it through coaxial cable can effectively rece the loss
there are two ways for Wi Fi to pass the coaxial line: frequency down and no frequency down
it is worth noting that the preliminary standard of the new ieee802.11n has passed. Ensure the throughput of 108mbps, up to 300mbps<
advantages of coaxial Wi-Fi:
full standard application, mature equipment and low price
disadvantages of coaxial Wi-Fi:
all branch distributors need to be replaced
(2) down frequency coaxial Wi-Fi technology
features of down frequency coaxial Wi-Fi:
rece the frequency to 900MHz without replacing the existing network equipment
like Moca, it can pass the branch distributor, It can't pass through the amplifier
because the bandwidth is lower than Moca, in order to ensure the bandwidth, a WiFi head usually has 12 cable TV users, and an ONU has four Wi-Fi heads
advantages of down conversion coaxial Wi-Fi:
mature technology and low price, which is the lowest cost of all active EOC technologies, compared with passive EOC, Advantages of rolling investment
disadvantages of frequency rection coaxial Wi-Fi:
frequency rection is a non-standard way, and the frequency rection chips of different manufacturers can not communicate with each other
3. Hpna3.0 technology
features of hpna3.0:
the frequency band is 12mhz-28mhz, which is completely the same as the existing CATV network structure
the physical layer rate is 128mbps, and the data link layer rate can reach 80mbps
fdqam molation is adopted, Setting 2-8 different frequency carriers on the frequency axis to transmit the same data at the same time has stronger anti-interference ability and better performance than traditional QAM molation
hpna3.0 advantages:
ITU's international standard, high bandwidth, can pass through branch distributor and amplifier
hpna3.0 disadvantages:
there are not many chip manufacturers, and the current price is still on the high side
4 PLC technology
PLC features:
in 2001, Homeplug 1.0 14mbps
in 2004, Homeplug turbo 85mbps
in 2005, Homeplug AV 200Mbps
frequency band: 2 ~ 28MHz, OFDM molation (84), maximum link attenuation 60dB, strong anti noise performance
data link layer data rate 30mbps, Homeplugav can reach 150Mbps
advantages of PLC:
mature technology, low price, alliance standard, IEEE standard under development, and anti noise, anti multipath
disadvantages of PLC:
200m chip is not mature, 45m chip bandwidth is only the same as Wi-Fi, recently SpeedBit's 224m chip has launched
PLC application topology
5 Baseband EOC Technology
features of baseband EOC:
link layer fully follows 802.3x, point-to-point connection, and all electrical characteristics are close to LAN mode
bipolar differential signal / unipolar signal, 75 Ω/ one hundred Ω Bandwidth: IP data: 0.5-65mhz
advantages of baseband EOC:
low cost per line, more manufacturers, a certain scale of application in China
disadvantages of baseband EOC:
can not pass through branch allocator, only support point-to-point star distribution network, each line bandwidth is fixed 10m, Second, non-standard technology
1. EPCN technology
EPCN features:
a home technology introced by Huasan, which adopts Broadcom's RF chip and base band transmission technology based on point to multipoint
EPCN advantages: low cost and can be realized through branch distributor, There is no need to change the existing network
disadvantages of EPCN: non-standard technology, proct application time is not long
Application topology of EPCN
2. Features of BIOC Technology:
a home technology launched by Hangzhou leiketong company, a technology based on WiFi frequency rection
advantages of BIOC:
low cost, which can be realized through branch distributor, There is no need to change the existing network
disadvantages of BIOC:
non-standard technology, the proct application time is not long
e to the limited transmission distance of Wi-Fi technology, Raycom has launched a proprietary amplifier, extender and other equipment
3. Uclink technology
features of uclink:
a new data access solution launched by Huawei, The system consists of the following moles:
uc8001: data access device: uc8001 is located between the user terminal and the convergence device, and is the network node of uclink integrated access system
uc6201: data user terminal: realizes the mutual transformation between RF data and standard Ethernet data
umix data radio frequency mixer: it is used to mix the data radio frequency input and output signals of uc8001 with CATV radio frequency signals for transmission in the coaxial distribution network
ujump data RF Jumper: it is used to bridge RF amplifier to ensure bidirectional transmission of uclink data RF signal. The jumper can be divided into over current type and non over current type< br />p; Actual test results: the actual transmission link attenuation of uclink is about 85dB (for field type uc8001, this link refers to the test data from the mixing port to uc6201, including the insertion loss of the mixer). Considering a certain link margin (5dB), the actual attenuation link loss is 80dB. If the line attenuation exceeds 80dB, the transmission rate of uclink system may decrease or the terminal may drop
in addition, uclink system supports 45dB dynamic line attenuation under the condition that the line attenuation does not exceed Lmax, that is, the allowable range of actual line attenuation L is: l = 35dbi80db
advantages of uclink:
good network adaptability
for the existing CATV network, simple two-way transformation and installation of corresponding uclink equipment can realize the data access function
the cost of single channel is lower than that of similar procts, especially in the case of low user access rate
with small initial investment and less engineering quantity, it can rapidly develop business. In the case of increasing user capacity, sustainable expansion can ensure the effectiveness of investment<
can support broadband services
disadvantages of uclink:
service support ability is weak, it is difficult to support three networks in one
user sharing 10m, single user broadband is less than 1m
broadband demand is small, it can only realize simple broadband Internet services
only belongs to a transition technology
schematic diagram of uclink for hub bridging scheme
4 Cableran technology
cableran features:
Putian E-vision introces an access scheme, which is a broadband access system based on one-way cable TV network. The cableran access device is composed of front-end MAS, intelligent port I / O and network management software
small "CMTS & quot;, Coverage of 5km, maximum access to 64 users
downlink band 40-80mhz, QAM256, maximum 48mbps
downlink transmission level: 50dbmv; Receiving level: - 10dbmv ~ 40dbmv
uplink band: 5 ~ 36MHz, QPSK, qam16, maximum 12mbps
uplink transmitting level: maximum 48dbmv (adaptive) receiving level: - 10dbmv ~ 15dbmv
MAS is a multi-mode access IP gateway device, which can restore I / O of front-end device to IP signal, It is a device between coaxial and IP interface for IP and RF conversion. Each front MAS can support 64 port I / O. the front MAS can be conveniently placed in buildings or optical nodes. The intelligent port I / O device is a kind of signal conversion device, which can restore the IP signal from the front MAS molation on the coaxial cable to the standard Ethernet signal in the form of RJ45 or USB interface
only the intelligent terminal I / O is needed to replace the existing ordinary STB, and a MAS small office is added between the trunk line and the building
cableran technology has an uplink bandwidth of 10mbit / s and a downlink bandwidth of 48mbit / s. It occupies 5-65mhz frequency, of which 5-36mhz is used for uplink and 40-65mhz is used for downlink. The downlink adopts 16 / 64 / 256qam molation, and the uplink adopts QPSK and 16QAM molation<
cableran network structure diagram
these non-standard procts have their own characteristics, do not have outstanding cost performance advantages, and have more technical and commercial risks
3. 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, next generation procts will be higher
& nbsp; Baseband EOC 10Mbps
2, cost comparison
MOCA is the highest, but the recent price decline is fast
hpna3.0 is high
PLC is medium
Wi-Fi is low
price of BIOC is not clear
price strategy of EPCN is not clear, proct cost is low
price of each line of baseband EOC is low, but the implicit cost is relatively high
3 Compared with the existing network, MOCA has better compatibility, which can pass through the branch distributor, but not through the amplifier
hpna3.0 has the best compatibility, which can pass through the branch distributor and the amplifier
PLC has better compatibility, which can pass through the branch distributor, But it can't pass through the amplifier
the compatibility of Wi-Fi procts is better, it can pass through the branch distributor, but it can't pass through the amplifier
the compatibility of BIOC procts is better, it can pass through the branch distributor, but it can't pass through the amplifier
the compatibility of EPCN procts is better, it can pass through the branch distributor, But it can't pass through amplifier
the compatibility of baseband EOC is poor, it can't pass through branch distributor and amplifier
4, maturity comparison
MOCA is relatively mature, it has large-scale application in North America
hpna3.0 is relatively mature, it has ITU standard support
PLC is relatively mature in power line application, The application in the field of radio and television has just begun
Wi-Fi procts are very mature, but the application of frequency rection part has just begun
procts launched by BIOC in 2006, and procts launched by EPCN in 2007 have been applied in China
features of MOCA:
use frequency band 800mhz-1500mhz, choose 1GHz below, convenient wiring
each channel bandwidth is 50MHz, 15 channels can be selected, physical layer rate can reach 270mbps, data link layer rate can reach 130mbps
use OFDM molation, TDMA / TDD
advantages of MOCA:
alliance standard, high bandwidth, can pass through branch distributor, In North America, MOCA has a large scale of application, but its disadvantages are as follows:
the price of a single chip manufacturer is still on the high side, and its procts are not mature enough.
the price of MOCA equipment drops rapidly, and there are more manufacturers.
MOCA application topology
2 (1) Coaxial Wi-Fi technology
features of coaxial Wi-Fi:
Wi Fi was originally the alias of IEEE802.11b wireless access network
IEEE 802.11g works at 2.400-2.482ghz, adopts OFDM molation, the physical layer transmission rate is 54Mbps, and the data link layer speed is about 25mbps
the main problem of using Wi Fi is that the wireless signal decays too fast, and transmitting it through coaxial cable can effectively rece the loss
there are two ways for Wi Fi to pass the coaxial line: frequency down and no frequency down
it is worth noting that the preliminary standard of the new ieee802.11n has passed. Ensure the throughput of 108mbps, up to 300mbps<
advantages of coaxial Wi-Fi:
full standard application, mature equipment and low price
disadvantages of coaxial Wi-Fi:
all branch distributors need to be replaced
(2) down frequency coaxial Wi-Fi technology
features of down frequency coaxial Wi-Fi:
rece the frequency to 900MHz without replacing the existing network equipment
like Moca, it can pass the branch distributor, It can't pass through the amplifier
because the bandwidth is lower than Moca, in order to ensure the bandwidth, a WiFi head usually has 12 cable TV users, and an ONU has four Wi-Fi heads
advantages of down conversion coaxial Wi-Fi:
mature technology and low price, which is the lowest cost of all active EOC technologies, compared with passive EOC, Advantages of rolling investment
disadvantages of frequency rection coaxial Wi-Fi:
frequency rection is a non-standard way, and the frequency rection chips of different manufacturers can not communicate with each other
3. Hpna3.0 technology
features of hpna3.0:
the frequency band is 12mhz-28mhz, which is completely the same as the existing CATV network structure
the physical layer rate is 128mbps, and the data link layer rate can reach 80mbps
fdqam molation is adopted, Setting 2-8 different frequency carriers on the frequency axis to transmit the same data at the same time has stronger anti-interference ability and better performance than traditional QAM molation
hpna3.0 advantages:
ITU's international standard, high bandwidth, can pass through branch distributor and amplifier
hpna3.0 disadvantages:
there are not many chip manufacturers, and the current price is still on the high side
4 PLC technology
PLC features:
in 2001, Homeplug 1.0 14mbps
in 2004, Homeplug turbo 85mbps
in 2005, Homeplug AV 200Mbps
frequency band: 2 ~ 28MHz, OFDM molation (84), maximum link attenuation 60dB, strong anti noise performance
data link layer data rate 30mbps, Homeplugav can reach 150Mbps
advantages of PLC:
mature technology, low price, alliance standard, IEEE standard under development, and anti noise, anti multipath
disadvantages of PLC:
200m chip is not mature, 45m chip bandwidth is only the same as Wi-Fi, recently SpeedBit's 224m chip has launched
PLC application topology
5 Baseband EOC Technology
features of baseband EOC:
link layer fully follows 802.3x, point-to-point connection, and all electrical characteristics are close to LAN mode
bipolar differential signal / unipolar signal, 75 Ω/ one hundred Ω Bandwidth: IP data: 0.5-65mhz
advantages of baseband EOC:
low cost per line, more manufacturers, a certain scale of application in China
disadvantages of baseband EOC:
can not pass through branch allocator, only support point-to-point star distribution network, each line bandwidth is fixed 10m, Second, non-standard technology
1. EPCN technology
EPCN features:
a home technology introced by Huasan, which adopts Broadcom's RF chip and base band transmission technology based on point to multipoint
EPCN advantages: low cost and can be realized through branch distributor, There is no need to change the existing network
disadvantages of EPCN: non-standard technology, proct application time is not long
Application topology of EPCN
2. Features of BIOC Technology:
a home technology launched by Hangzhou leiketong company, a technology based on WiFi frequency rection
advantages of BIOC:
low cost, which can be realized through branch distributor, There is no need to change the existing network
disadvantages of BIOC:
non-standard technology, the proct application time is not long
e to the limited transmission distance of Wi-Fi technology, Raycom has launched a proprietary amplifier, extender and other equipment
3. Uclink technology
features of uclink:
a new data access solution launched by Huawei, The system consists of the following moles:
uc8001: data access device: uc8001 is located between the user terminal and the convergence device, and is the network node of uclink integrated access system
uc6201: data user terminal: realizes the mutual transformation between RF data and standard Ethernet data
umix data radio frequency mixer: it is used to mix the data radio frequency input and output signals of uc8001 with CATV radio frequency signals for transmission in the coaxial distribution network
ujump data RF Jumper: it is used to bridge RF amplifier to ensure bidirectional transmission of uclink data RF signal. The jumper can be divided into over current type and non over current type< br />p; Actual test results: the actual transmission link attenuation of uclink is about 85dB (for field type uc8001, this link refers to the test data from the mixing port to uc6201, including the insertion loss of the mixer). Considering a certain link margin (5dB), the actual attenuation link loss is 80dB. If the line attenuation exceeds 80dB, the transmission rate of uclink system may decrease or the terminal may drop
in addition, uclink system supports 45dB dynamic line attenuation under the condition that the line attenuation does not exceed Lmax, that is, the allowable range of actual line attenuation L is: l = 35dbi80db
advantages of uclink:
good network adaptability
for the existing CATV network, simple two-way transformation and installation of corresponding uclink equipment can realize the data access function
the cost of single channel is lower than that of similar procts, especially in the case of low user access rate
with small initial investment and less engineering quantity, it can rapidly develop business. In the case of increasing user capacity, sustainable expansion can ensure the effectiveness of investment<
can support broadband services
disadvantages of uclink:
service support ability is weak, it is difficult to support three networks in one
user sharing 10m, single user broadband is less than 1m
broadband demand is small, it can only realize simple broadband Internet services
only belongs to a transition technology
schematic diagram of uclink for hub bridging scheme
4 Cableran technology
cableran features:
Putian E-vision introces an access scheme, which is a broadband access system based on one-way cable TV network. The cableran access device is composed of front-end MAS, intelligent port I / O and network management software
small "CMTS & quot;, Coverage of 5km, maximum access to 64 users
downlink band 40-80mhz, QAM256, maximum 48mbps
downlink transmission level: 50dbmv; Receiving level: - 10dbmv ~ 40dbmv
uplink band: 5 ~ 36MHz, QPSK, qam16, maximum 12mbps
uplink transmitting level: maximum 48dbmv (adaptive) receiving level: - 10dbmv ~ 15dbmv
MAS is a multi-mode access IP gateway device, which can restore I / O of front-end device to IP signal, It is a device between coaxial and IP interface for IP and RF conversion. Each front MAS can support 64 port I / O. the front MAS can be conveniently placed in buildings or optical nodes. The intelligent port I / O device is a kind of signal conversion device, which can restore the IP signal from the front MAS molation on the coaxial cable to the standard Ethernet signal in the form of RJ45 or USB interface
only the intelligent terminal I / O is needed to replace the existing ordinary STB, and a MAS small office is added between the trunk line and the building
cableran technology has an uplink bandwidth of 10mbit / s and a downlink bandwidth of 48mbit / s. It occupies 5-65mhz frequency, of which 5-36mhz is used for uplink and 40-65mhz is used for downlink. The downlink adopts 16 / 64 / 256qam molation, and the uplink adopts QPSK and 16QAM molation<
cableran network structure diagram
these non-standard procts have their own characteristics, do not have outstanding cost performance advantages, and have more technical and commercial risks
3. 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, next generation procts will be higher
& nbsp; Baseband EOC 10Mbps
2, cost comparison
MOCA is the highest, but the recent price decline is fast
hpna3.0 is high
PLC is medium
Wi-Fi is low
price of BIOC is not clear
price strategy of EPCN is not clear, proct cost is low
price of each line of baseband EOC is low, but the implicit cost is relatively high
3 Compared with the existing network, MOCA has better compatibility, which can pass through the branch distributor, but not through the amplifier
hpna3.0 has the best compatibility, which can pass through the branch distributor and the amplifier
PLC has better compatibility, which can pass through the branch distributor, But it can't pass through the amplifier
the compatibility of Wi-Fi procts is better, it can pass through the branch distributor, but it can't pass through the amplifier
the compatibility of BIOC procts is better, it can pass through the branch distributor, but it can't pass through the amplifier
the compatibility of EPCN procts is better, it can pass through the branch distributor, But it can't pass through amplifier
the compatibility of baseband EOC is poor, it can't pass through branch distributor and amplifier
4, maturity comparison
MOCA is relatively mature, it has large-scale application in North America
hpna3.0 is relatively mature, it has ITU standard support
PLC is relatively mature in power line application, The application in the field of radio and television has just begun
Wi-Fi procts are very mature, but the application of frequency rection part has just begun
procts launched by BIOC in 2006, and procts launched by EPCN in 2007 have been applied in China
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