CN100345421C - Broadband access system and access method implemented on cable TV network - Google Patents
Broadband access system and access method implemented on cable TV network Download PDFInfo
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Abstract
The invention provides a broadband access system and access method implemented on cable TV network, comprising a synthesis light gathering station, a duplex mixer, a branching device, a network side of the HFC coaxial distribution, a terminal accessing device connected with the HFC light network side of the cable TV network, IP area network. Also provided is a broadband accessing method, comprising: synthesis light gathering station receiving the CATV light signal, a data signal and converting into the CATV radio frequency signal and the data radio frequency signal, transmitting to the duplex mixer for a multiplexing and transmitting to the branching device through the HFC coaxial distribution network side, demultiplexing to a source signal and transmitting to the TV and terminal receiver respectively; and the duplex mixer receiving the upstream signal from the HFC coaxial distribution network side and demultiplexing to the data radio frequency signal and transmitting to the IP area network through the synthesis light gathering station. The invention can access the broadband based on the CATV network in a lower cost.
Description
Technical Field
The invention relates to the technical field of broadband network access, in particular to a system for realizing broadband access on a cable television network and an access method thereof.
Background
A system for providing users with multiple channels of video, audio, and data signals in a wired manner in a certain area is called a cable television (CATV) system. After the middle of the nineties, with the progress of society and the development of technology, the CATV system is rapidly developed in the direction of large scale, multiple functions and multiple services. Due to the development of new technologies, such as optical fiber technology in optical transmission technology, bidirectional transmission technology, and hybrid fiber coaxial network (HFC) technology, the CATV system can implement various new services, such as VOD, multimedia services, broadband access based on CATV network, and the like, in addition to the basic broadcast television program transmission.
Especially, the development of optical transmission technology overcomes a series of defects of the original coaxial cable transmission mode used by the CATV system, promotes the change of the CATV network from the original coaxial cable network to the optical fiber coaxial hybrid network, and can be regarded as a major leap of the CATV system technology development. Meanwhile, the rapid development of broadband networks and broadband services, and since the CATV system has been basically covered to all the user homes, a scheme for implementing broadband access through the CATV network has been proposed.
For a pure CATV network, the adopted HFC includes an HFC optical network side and an HFC coaxial distribution network side, and since the CATV network uses a broadcast method to transmit a television signal downstream to each user, the optical network side of the HFC network is a network for unidirectional transmission.
In order to implement broadband access based on a CATV network, an optical network side of an HFC network needs to be changed to a bidirectional network to implement uplink transmission of data. Fig. 1 shows a broadband access system implemented over a CATV network.
The broadband access system mainly comprises: an ethernet Switch 102(LAN Switch), a Cable Modem central office equipment 103 (CMTS), an up-converter 105, a hybrid 106, an HFC network including an HFC optical network side 107 and an HFC coaxial distribution network side 108, a splitter 109, a Cable Modem 110(CM, Cable Modem), and the like.
For downstream data, after a data signal of an IP metropolitan area network is transmitted to the CMTS 103 through the ethernet switch 102, the CMTS 103 converts the downstream signal into one channel of CATV through the up-converter 105, multiplexes the downstream signal into the CATV signal through the mixer 106, transmits the CATV signal to the HFC coaxial distribution network 108 through the HFC optical network 107, separates the downstream signal through the splitter 109, and restores the IP data signal through the CM 110. For upstream data, the subscriber converts the data into rf signal through CM 110, transmits the rf signal to the coaxial distribution network 108 through splitter 109, transmits the rf signal to CMTS 103 through the modified HFC optical network 107, and converts the rf signal into IP data by CMTS 103 and transmits the IP data to the IP metropolitan area network through ethernet switch 102.
The main drawbacks with such broadband access systems are: the original HFC optical network side needs to be modified, and because the pure CATV network is a downlink unidirectional transmission network, in order to implement uplink transmission of data, the original CATV unidirectional transmission HFC optical network needs to be modified into a bidirectional transmission optical network to support uplink and downlink signals, and the network is modified more, for example, an optical receiving device is added to a return optical transmitter, and the like. By adopting the scheme, not only new equipment needs to be added, but also the influence on the original CATV network needs to be considered for transforming the HFC optical network, so that the network transformation process becomes complicated, and the cost is higher.
On the other hand, the access device is disposed at the optical node, generally, from the network structure, the access device disposed at one optical node should be designed to have a capability of covering at least 500 users, and the corresponding management overhead and bandwidth overhead costs are configured with a capability greater than 500 users, and the costs are also high.
In addition, the cost investment is required from the perspective of the input cost ratio and the profit ratio, but the input cost ratio is far greater than the profit ratio when the number of users using the CATV network for broadband access is small, and particularly, in the initial construction of the network, the period from the cost recovery to the profit is long and the market profit is poor because the number of users is too small.
Disclosure of Invention
The invention aims to provide a broadband access system and an access method thereof on a cable television network, which can realize the broadband access based on a CATV network with lower cost.
The invention provides a system for realizing broadband access on a cable television network, wherein the cable television network comprises an HFC optical network side (107) and an HFC coaxial distribution network side (108), and the system comprises: an integrated convergence optical station (201), a duplex mixer (202), a splitter (109), and a terminal access (203),
the integrated convergence optical station (201) is respectively connected with an HFC optical network side (107), an IP metropolitan area network and a duplex mixer (202) and is used for respectively converting CATV optical signals from the HFC optical network side (107) and data signals from the IP metropolitan area network into CATV radio frequency signals and data radio frequency signals to be sent to the duplex mixer (202) and converting the data radio frequency signals from the duplex mixer (202) into data signals to be sent to the IP metropolitan area network;
a duplex mixer (202) connected with the splitter (109) through an HFC coaxial distribution network side (108) and used for multiplexing CATV radio frequency signals and data radio frequency signals from the integrated convergence optical station (201), then sending the signals to the splitter (109), demultiplexing the signals uploaded by the splitter (109) to obtain data radio frequency signals and sending the data radio frequency signals to the integrated convergence optical station (201),
the splitter (109) is connected with the terminal access device (203) and is used for demultiplexing the signal from the duplex mixer (202) to obtain a data radio frequency signal and transmitting the data radio frequency signal to the terminal access device (203), and multiplexing the data radio frequency signal from the terminal access device (203) into an uplink signal and transmitting the uplink signal to the duplex mixer (202);
the terminal access device (203) is used for realizing conversion between the data radio frequency signal and the data signal.
Wherein the integrated convergence light station (201) comprises: an optical receiver (2011), a radio frequency amplifier (2012), an Ethernet switch (2013) and a data access device (2014); the optical receiver (2011) is connected with the radio frequency amplifier (2012) and an external HFC optical network side (107) and is used for converting the received CATV optical signal into a CATV radio frequency signal and sending the CATV radio frequency signal to the radio frequency amplifier; the radio frequency amplifier (2012) is used for amplifying the received CATV radio frequency signal and outputting the amplified CATV radio frequency signal to an external duplex mixer (202); the Ethernet switch (2013) is connected with the data access equipment (2014) and the IP metropolitan area network and is used for realizing the forwarding of data signals between the data access equipment (2014) and the IP metropolitan area network; the data access device (2014) is also connected with the external duplex mixer (202) and is used for realizing the conversion of the data signal and the data radio frequency signal.
Wherein, the data access equipment (2014) comprises: the system comprises a radio frequency interface unit, a radio frequency transceiving unit, a baseband and MAC processing unit, a main CPU unit, an Ethernet transceiving unit and an Ethernet interface unit, wherein all the units are connected in sequence; the radio frequency receiving and transmitting unit and the radio frequency interface unit jointly realize the receiving and the sending of data radio frequency signals; the baseband and MAC processing unit is used for processing a physical layer and an MAC layer of a data radio frequency signal; the main CPU unit is used for realizing the conversion of data signals and data radio frequency signal formats and controlling the baseband and the MAC processing unit; the Ethernet receiving and transmitting unit and the Ethernet interface unit realize the receiving and transmitting of data signals together.
The invention also provides a method for realizing broadband access on the cable television network, the cable television network comprises an HFC optical network side (107) and an HFC coaxial distribution network side (108), the broadband access system comprises an integrated convergence optical station (201), a duplex mixer (202), a splitter (109) and a terminal access device (203), the broadband access method comprises the downlink transmission and the uplink transmission of data, wherein,
the downlink transmission of data comprises the following steps:
the comprehensive convergence optical station (201) receives a data signal from an IP metropolitan area network, converts the data signal into a data radio frequency signal and sends the data radio frequency signal to the duplex mixer (202);
the duplex mixer (202) multiplexes the received data radio frequency signal into a downlink radio frequency signal, and transmits the downlink radio frequency signal to the splitter (109) through the HFC coaxial distribution network side (108);
the splitter (109) demultiplexes the received radio frequency signal into a data radio frequency signal and sends the data radio frequency signal to the terminal access device (203);
the terminal access device (203) converts the data radio frequency signal into a data signal and sends the data signal to the user data terminal equipment;
the uplink transmission of data comprises the following steps:
the terminal access device (203) converts the data signal from the user data terminal equipment into a data radio frequency signal and sends the data radio frequency signal to the branching device (109);
the splitter (109) multiplexes the received data radio frequency signal into an uplink radio frequency signal, and transmits the signal to the duplex mixer (202) through the HFC coaxial distribution network side (108);
the duplex mixer (202) demultiplexes the received uplink radio frequency signal into a data radio frequency signal and sends the data radio frequency signal to the comprehensive convergence optical station (201);
the integrated convergence optical station (201) converts the data radio frequency signal from the duplex mixer (202) into a data signal and sends the data signal to the IP metropolitan area network.
Wherein, the data radio frequency signal is a radio frequency signal larger than 860 MHz.
The data signal is a LAN protocol signal, and the data radio frequency signal is a WLAN protocol signal.
Wherein, the LAN protocol comprises IEEE802.3 protocol; the WLAN protocol comprises an IEEE802.11a protocol, an IEEE802.11b protocol or an IEEE802.11g protocol.
Wherein, the multiplexing is frequency division multiplexing or time division multiplexing.
After the technical scheme is adopted, the invention has the following advantages:
the broadband access system provided by the invention effectively utilizes the coaxial cable resources at the HFC coaxial distribution network side of the existing CATV network, and realizes broadband access and one-line home entry of cable television services on the CATV network. The invention directly connects the access device with the HFC coaxial distribution network side of the CATV system, does not change the HFC optical network side, can completely adopt the original CATV network, and only superposes new devices on the original network. Compared with the prior art, the initial investment cost is reduced because the HFC optical network side is not required to be modified. And because the broadband access is realized by adopting a mode of superposing new equipment on the original CATV network, the influence on the original CATV network is small.
2, from the network structure, since the data access device of the present invention is placed on the coaxial distribution network side, the amount of users covered by the device placed on the node on this side is small, the access device has the capability of covering about 200 users, which is enough for the current situation that there are few users, and since the capability of covering users is small, the corresponding management overhead cost and bandwidth overhead cost will also be relatively small.
And 3, the cost investment is low in terms of investment cost ratio and profit ratio, and if a design with the investment cost ratio of 200 users is adopted and 100 users are accessed, the investment ratio and the profit ratio are about 200: 100, so that the cost and the profit can be quickly recovered.
4, the invention also adopts high frequency band to transmit the data accessed by the broadband, and keeps away from the noise frequency point, thereby improving the anti-interference capability of data transmission and reducing the error rate of data transmission. And, because the WLAN protocol is further used, the data transmission has better bad resistance performance of the WLAN protocol.
Brief description of the drawings
Fig. 1 is a structural diagram of a conventional CATV-based broadband access system;
FIG. 2 is a diagram of the structure of the CATV network-based broadband access system of the present invention;
FIG. 3 is a block diagram of a data access device according to the present invention;
fig. 4 is a flow chart of data downlink transmission;
fig. 5 is a flowchart of uplink data transmission.
Modes for carrying out the invention
The invention provides a scheme for realizing broadband access through a CATV network, which moves an Ethernet switch and data access equipment down to an HFC coaxial distribution network side to ensure that the Ethernet switch and the data access equipment are not directly connected to the HFC coaxial distribution network side through an HFC optical network side part any more, thus avoiding the transformation of bidirectional transmission on the HFC optical network side and avoiding the transformation of an optical receiver of the original CATV network. In addition, the coaxial cable resource on the HFC coaxial distribution network side is utilized to realize access to the user, and the line of the part of the access user is not required to be additionally erected.
The ethernet switch and the data access device are directly configured on the cell optical receiver side, and although the large-capacity users cannot be covered, the situation that the number of users is few through CATV broadband access currently is met. Accordingly, the management overhead and bandwidth overhead costs are also small, and the costs and benefits can be quickly recovered.
In addition, the frequency of various noises in the CATV network is mainly concentrated below 30MHz, including interference signals and noises below 30MHz generated by user terminal equipment, fault equipment, bad connectors, power switches and the like from network contents, and interference noises of 5-30 MHz from the outside of the network, while the existing broadband access system of the CATV network mainly adopts a frequency band below 50MHz to transmit uplink data, which is close to a noise frequency point, and the uplink data is greatly influenced by the noises, thereby easily causing error codes. Therefore, the invention also adopts higher frequency point to transmit user data, and because the signal range carried by the coaxial distribution network is 5-1000 MHz, the invention proposes to adopt the frequency point of 100 MHz-1000 MHz to transmit the data signal of the user. Preferably, 860MHz and 1000MHz may be used, since the frequency point of the CATV downstream signal may be far away. In addition, the invention also adopts the WLAN protocol (IEEE802.11) to realize the data transmission, and directly transplants the excellent anti-interference capability of the WLAN protocol.
The broadband access system of the present invention will be described in detail with reference to the system configuration diagram of the present invention for implementing broadband access based on a CATV network, as shown in fig. 2. The system mainly comprises:
the integrated convergence optical station 201 is connected with the HFC optical network side 107, is also connected with an IP metropolitan area network, and is connected with the duplex mixer 202; for converting CATV optical signals from HFC optical network side 107 and data signals from the IP metropolitan area network into radio frequency signals to be sent to the duplex mixer 202, and converting radio frequency signals from the duplex mixer 202 into data signals to be sent to the IP metropolitan area network. Specifically, the integrated convergence optical station 201 is composed of an optical receiver 2011, a radio frequency amplifier 2012, an ethernet switch 2013, and a plurality of data access devices 2014. Wherein,
the optical receiver 2011 is connected to the rf amplifier 2012, and the optical receiver 2011 is configured to receive the CATV optical signal, convert the CATV optical signal into an rf signal, send the rf signal to the rf amplifier 2012 for amplification, and output the rf signal to the external plurality of duplex mixers 202.
The ethernet switch 2013 is connected to the multiple data access devices 2014, and the ethernet switch 2013 is further connected to the IP metropolitan area network, so as to implement mutual forwarding of data signals between the data access devices 2014 and the IP metropolitan area network. The data access device 2014 is further connected to the duplex mixer 202, and the data access device 2014 is used for converting a data signal and a radio frequency signal, and for convenience of description, the radio frequency signal converted by the data signal is referred to as a data radio frequency signal. Specifically, the data access device 2014 is used for performing inter-conversion between the wireless protocol IEEE802.11 and the ethernet IEEE802.3 protocol. According to the WLAN protocol standard, if the IEEE802.11b protocol is applied, the transmission rate can reach 11Mbps/22 Mbps; if the ieee802.11g or ieee802.11a protocol is applied, the rate can be as high as 54 Mbps. The data access device 2014 also enables control and management of access users.
The broadband access system of the invention also comprises:
the duplex mixers 202, the number of which is the same as that of the data access devices 2014, each of the duplex mixers 202 is connected to the above-mentioned rf amplifier 2012 and is also connected to one of the data access devices 2014 in a one-to-one correspondence manner, and the duplex mixer 202 is configured to mix the CATV rf signal (including the digital television QAM rf signal, the same applies hereinafter) transmitted by the rf amplifier 2012 and the data rf signal transmitted by the data access device 2014 to generate a new signal and transmit the new signal to the HFC coaxial distribution network side 108, and to unmix the data rf signal uploaded from the HFC coaxial distribution network side 108 and transmit the new signal to the connected data access device 2014. When the duplex mixer 202 employs frequency division multiplexing, the high frequency band of the mixed downlink signal carries IEEE802.11 protocol signals, and the low frequency band carries CATV signals. And for the uplink signal, demultiplexing the carried IEEE802.11 protocol signal from the high frequency band of the uplink signal is realized. It will be understood by those skilled in the art that the duplex mixer 202 may also use time division multiplexing or the like to multiplex/demultiplex the two signals, which will not be described below.
The HFC coaxial distribution network side 108, which is a coaxial cable network part of the HFC network, is configured to perform demultiplexing on the mixed radio frequency signal transmitted from the duplex mixer 202, transmit the multiplexed radio frequency signal to each splitter 109, and transmit an uplink signal transmitted from the splitter 109 to the duplex mixer 202.
A splitter 109, connected to the HFC coaxial distribution network side 108, and also connected to the user's television and the terminal access 203, for receiving the radio frequency signal of the HFC coaxial distribution network side 108, separating out the CATV radio frequency signal and the data radio frequency signal, and respectively sending the CATV radio frequency signal and the data radio frequency signal to the television and the terminal access 203; and transmits the upstream data transmitted from the terminal access 203 to the HFC coaxial distribution network side 108. Specifically, the high-frequency band and the low-frequency band of the received signal are demultiplexed, the CATV radio frequency signal carried by the low-frequency band of the signal is separated and sent to the television, and the IEEE802.11 protocol signal carried by the high-frequency band of the signal is separated and sent to the terminal access 203. And multiplexing the IEEE802.11 protocol signal from the terminal access 203 into the high frequency band of the uplink signal, and transmitting to the HFC coaxial distribution network side 108.
The terminal access 203, which is connected to the splitter 109 and the user computer (PC), may be disposed in the user's home for implementing the conversion of the radio frequency signal and the data signal, and in particular, the conversion between the IEEE802.3 protocol signal from the computer connected thereto and the IEEE802.11 protocol signal from the splitter 109.
Fig. 3 shows a schematic diagram of the data access device 2014 of the integrated convergence optical station 201 according to the present invention, which includes:
the radio frequency interface unit is used for amplifying the power of radio frequency signals modulated with broadband data and providing a radio frequency interface; the radio frequency transceiving unit is used for receiving and transmitting radio frequency signals. In the actual radio frequency transceiving unit and radio frequency interface unit circuit, the impedance of the radio frequency modulation circuit part is adjusted to match the network, adjust the frequency synthesizer, adjust the line filter and other devices, so that the carrier wave meets the requirements of 860-1000MHz frequency points, and the receiving and sending of the data radio frequency signals in the frequency band are realized.
The baseband and MAC processing unit is connected with the radio frequency transceiving unit, the unit processes the physical layer and the MAC layer of the data radio frequency signal according to the 802.11 protocol, and the unit can be designed by fully referring to the standard of the baseband and MAC processing unit in the mature WLAN system.
The Ethernet interface unit is mainly used for realizing Ethernet signal isolation and protection, providing an Ethernet standard interface and transmitting Ethernet data conforming to the 802.3 standard; the Ethernet transceiving unit is used for realizing the receiving and sending of Ethernet signals. The Ethernet transceiver unit and the Ethernet interface unit can be realized by a common Ethernet MAC and a physical layer chip.
The main CPU unit is connected with the Ethernet receiving and transmitting unit and is used for realizing the conversion of the formats of the Ethernet data signals and the data radio frequency signals and the control of the baseband and the MAC processing unit, and the main CPU unit can be realized by a general CPU. Specifically, the format conversion of the 802.11MAC frame and the 802.3MAC frame is realized, and the control unit is connected with the baseband and the MAC processing unit through a bus to control the baseband and the MAC processing unit.
The invention also correspondingly provides a data transmission method based on the broadband access system. Including upstream transmission of data and downstream transmission of data.
The flow chart of data downlink transmission (i.e. transmission from the network side to the user side) shown in fig. 4 includes the following steps:
step 401: the data signal downloaded from the IP metropolitan area network is transmitted to the data access device 2014 through the ethernet switch 2013 by using the 802.3 protocol. The data access device 2014 completes protocol conversion from 802.3 to 802.11, modulates the received data signal into a data radio frequency signal (i.e., a signal required by the 802.11 protocol) with a frequency greater than 860MHz and a high frequency band, forms a first signal, and sends the first signal to the duplex mixer 202. On the other hand, the optical receiver 2011 receives a CATV optical signal from the HFC optical network side, amplifies the CATV optical signal by the rf amplifier 2012, and transmits the amplified CATV optical signal to the duplex mixer 202.
Step 402: the duplex mixer 202 mixes the high-frequency-band data rf signal from the data access device 2014 and the low-frequency-band CATV rf signal from the rf amplifier 2012 by using a frequency division multiplexing method (or a time division multiplexing method, etc.), so as to form a second signal, and sends the second signal to the HFC coaxial distribution network side 108; from the HFC coaxial distribution network side 108 to the corresponding splitter 109.
Step 403: the splitter 109 separates the data rf signal carried in the high frequency band and the CATV signal carried in the low frequency band from the received second signal, and transmits them to the TV and the terminating access 203, respectively.
Step 404: the terminal access 203 receives the data rf signal from the splitter 109, performs protocol conversion from 802.11 to 802.3, converts the data rf signal into a data signal required by the 802.3 protocol, and transmits the data signal to the data device, such as a computer of a user, through a USB port or an ethernet port connected to the data device, such as a computer, to complete downlink transmission of data.
The flow chart of uplink data transmission (i.e. transmission from the user side to the network side) shown in fig. 5 includes the following steps:
step 501: data equipment such as a user side computer sends a data signal to the terminal access 203 through an 802.3 protocol, the terminal access 203 performs 802.3 to 802.11 protocol conversion on the data, modulates the data signal into a data radio frequency signal (i.e., a signal required by the 802.11 protocol) with a frequency greater than 860MHz in a high frequency band, forms a third signal, and sends the third signal to the splitter 109.
Step 502: the splitter 109 mixes the high-band data rf signal into the high-band of the uplink signal by using a frequency division multiplexing method (or a time division multiplexing method, etc.), and the mixed uplink signal is referred to as a fourth signal here and is transmitted to the HFC coaxial distribution network side 108.
Step 503: the duplex mixer 202 receives the upstream fourth signal from the HFC coaxial distribution network side 108, demultiplexes the data rf signal carried by the high frequency signal from the upstream fourth signal, and transmits the demultiplexed data rf signal to the data access device 2014.
Step 504: the data access device 2014 completes protocol conversion from 802.11 to 802.3, that is, converts a data radio frequency signal into a data signal transmitted by the ethernet, and then sends the data signal to the related device of the IP metropolitan area network for three-layer exchange after being converged by the ethernet switch 2013, and the data signal is transmitted to the internet through a specific route.
Through the scheme, the invention can realize the broadband access of the user through the CATV network by directly utilizing the HFC coaxial distribution network of the CATV network without changing the side of the HFC optical network of the CATV, and has low cost compared with the broadband access realization method of the background technology.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A system for enabling broadband access over a cable television network, the cable television network including an HFC optical network side (107) and an HFC coaxial distribution network side (108), the system comprising: an integrated convergence optical station (201), a duplex mixer (202), a splitter (109), and a terminal access (203),
the integrated convergence optical station (201) is respectively connected with an HFC optical network side (107), an IP metropolitan area network and a duplex mixer (202) and is used for respectively converting CATV optical signals from the HFC optical network side (107) and data signals from the IP metropolitan area network into CATV radio frequency signals and data radio frequency signals to be sent to the duplex mixer (202) and converting the data radio frequency signals from the duplex mixer (202) into data signals to be sent to the IP metropolitan area network;
the duplex mixer (202) is connected with the splitter (109) through an HFC coaxial distribution network side (108), and is used for multiplexing CATV radio frequency signals and data radio frequency signals from the comprehensive convergence optical station (201), then sending the signals to the splitter (109), demultiplexing the signals uploaded by the splitter (109), sending the data radio frequency signals to the comprehensive convergence optical station (201);
the splitter (109) is connected with the terminal access device (203) and is used for demultiplexing the signal from the duplex mixer (202) to obtain a data radio frequency signal and transmitting the data radio frequency signal to the terminal access device (203), and multiplexing the data radio frequency signal from the terminal access device (203) into an uplink signal and transmitting the uplink signal to the duplex mixer (202);
the terminal access device (203) is used for realizing conversion between the data radio frequency signal and the data signal.
2. The system according to claim 1, wherein said integrated concentrating optical station (201) comprises: an optical receiver (2011), a radio frequency amplifier (2012), an Ethernet switch (2013) and a data access device (2014); wherein,
the optical receiver (2011) is connected with the radio frequency amplifier (2012) and an external HFC optical network side (107) and is used for converting the received CATV optical signal into a CATV radio frequency signal and sending the CATV radio frequency signal to the radio frequency amplifier;
the radio frequency amplifier (2012) is used for amplifying the received CATV radio frequency signal and outputting the amplified CATV radio frequency signal to an external duplex mixer (202);
the Ethernet switch (2013) is connected with the data access equipment (2014) and the IP metropolitan area network and is used for realizing the forwarding of data signals between the data access equipment (2014) and the IP metropolitan area network;
the data access device (2014) is also connected with the external duplex mixer (202) and is used for realizing the conversion of the data signal and the data radio frequency signal.
3. The system of claim 2, wherein said data access device (2014) comprises: the system comprises a radio frequency interface unit, a radio frequency transceiving unit, a baseband and MAC processing unit, a main CPU unit, an Ethernet transceiving unit and an Ethernet interface unit, wherein all the units are connected in sequence; wherein,
the radio frequency receiving and transmitting unit and the radio frequency interface unit jointly realize the receiving and the sending of data radio frequency signals;
the baseband and MAC processing unit is used for processing a physical layer and an MAC layer of a data radio frequency signal;
the main CPU unit is used for realizing the conversion of data signals and data radio frequency signal formats and controlling the baseband and the MAC processing unit;
the Ethernet receiving and transmitting unit and the Ethernet interface unit realize the receiving and transmitting of data signals together.
4. A method for realizing broadband access on cable television network, the cable television network includes HFC optical network side (107) and HFC coaxial distribution network side (108), the broadband access system includes the comprehensive convergence optical station (201), the duplex mixer (202), the splitter (109), the terminal access device (203), the said broadband access method includes the downstream transmission and upstream transmission of the data, wherein,
the downlink transmission of data comprises the following steps:
the comprehensive convergence optical station (201) receives a data signal from an IP metropolitan area network, converts the data signal into a data radio frequency signal and sends the data radio frequency signal to the duplex mixer (202);
the duplex mixer (202) multiplexes the received data radio frequency signal into a downlink radio frequency signal, and transmits the downlink radio frequency signal to the splitter (109) through the HFC coaxial distribution network side (108);
the splitter (109) demultiplexes the received radio frequency signal into a data radio frequency signal and sends the data radio frequency signal to the terminal access device (203);
the terminal access device (203) converts the data radio frequency signal into a data signal and sends the data signal to the user data terminal equipment;
the uplink transmission of data comprises the following steps:
the terminal access device (203) converts the data signal from the user data terminal equipment into a data radio frequency signal and sends the data radio frequency signal to the branching device (109);
the splitter (109) multiplexes the received data radio frequency signal into an uplink radio frequency signal, and transmits the signal to the duplex mixer (202) through the HFC coaxial distribution network side (108);
the duplex mixer (202) demultiplexes the received uplink radio frequency signal into a data radio frequency signal and sends the data radio frequency signal to the comprehensive convergence optical station (201);
the integrated convergence optical station (201) converts the data radio frequency signal from the duplex mixer (202) into a data signal and sends the data signal to the IP metropolitan area network.
5. The method of claim 4, wherein the data RF signal is an RF signal greater than 860 MHz.
6. The method of claim 4, wherein said data signal is a LAN protocol signal and said data radio frequency signal is a WLAN protocol signal.
7. The method of claim 6, wherein said LAN protocol comprises an IEEE802.3 protocol; the WLAN protocol comprises an IEEE802.11a protocol, an IEEE802.11b protocol or an IEEE802.11g protocol.
8. The method of claim 4, wherein the multiplexing is frequency division multiplexing or time division multiplexing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103992 CN1615013A (en) | 2003-11-05 | 2003-11-05 | System for realizing wideband inserting in wireless Tv-set network |
| CN200310103992.2 | 2003-11-05 | ||
| PCT/CN2004/001256 WO2005046129A1 (en) | 2003-11-05 | 2004-11-04 | A system and access method for achieving broadband access in the cable television network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1799223A CN1799223A (en) | 2006-07-05 |
| CN100345421C true CN100345421C (en) | 2007-10-24 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200310103992 Pending CN1615013A (en) | 2003-11-05 | 2003-11-05 | System for realizing wideband inserting in wireless Tv-set network |
| CNB2004800150003A Expired - Fee Related CN100345421C (en) | 2003-11-05 | 2004-11-04 | Broadband access system and access method implemented on cable TV network |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310103992 Pending CN1615013A (en) | 2003-11-05 | 2003-11-05 | System for realizing wideband inserting in wireless Tv-set network |
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| Country | Link |
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| CN (2) | CN1615013A (en) |
| WO (1) | WO2005046129A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100499464C (en) * | 2006-07-11 | 2009-06-10 | 杭州华三通信技术有限公司 | Ethernet receiving and transmission device based on TV coaxial line |
| CN101123695B (en) * | 2006-08-07 | 2010-12-15 | 石方太 | Wired TV network 'narrow band home access' transmission method |
| CN101146213B (en) * | 2006-09-11 | 2010-05-12 | 思华科技（上海）有限公司 | VoD network and ordering method |
| CN101075825A (en) * | 2007-06-27 | 2007-11-21 | 顾士平 | Hybrid-access wide band network of CATV power line |
| CN101166081B (en) * | 2007-08-30 | 2010-08-18 | 杭州华三通信技术有限公司 | A method, system and device for detecting link polarity |
| CN101494804B (en) * | 2009-03-03 | 2011-06-15 | 天栢宽带网络科技（上海）有限公司 | Wired network bidirectional reconstruction system compatible with wideband and narrowband |
| CN102035704B (en) * | 2010-12-27 | 2012-07-11 | 甘静 | Wideband access system based on HFC (Hybrid Fiber Coaxial) network |
| EP2523357B1 (en) * | 2011-05-12 | 2013-09-18 | Siemens Aktiengesellschaft | Subsea data communication system and method |
| CN103220194A (en) * | 2012-01-19 | 2013-07-24 | 上海未来宽带技术股份有限公司 | HiNOC equipment and implementation method thereof |
| CN103338138B (en) * | 2013-05-31 | 2016-04-20 | 武汉市天晨翔云数据有限公司 | The method for channel allocation of optical-power broadband access system and this system |
| CN104394047A (en) * | 2014-10-30 | 2015-03-04 | 成都康特电子高新科技有限责任公司 | High-definition bidirectional HFC (Hybrid Fiber Coaxial) system based on broadcast television network |
| CN104539491A (en) * | 2014-10-30 | 2015-04-22 | 成都康特电子高新科技有限责任公司 | Bilateral HFC (Hybrid Fiber Coax) system based on broadcast television network |
| CN109308011A (en) * | 2017-07-26 | 2019-02-05 | 美的智慧家居科技有限公司 | The distribution method, apparatus and smart home device of smart home device |
| CN108234300B (en) * | 2018-02-26 | 2024-03-29 | 深圳市新龙鹏科技有限公司 | CATV+PON+EoC technology home gateway and implementation method thereof |
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- 2004-11-04 CN CNB2004800150003A patent/CN100345421C/en not_active Expired - Fee Related
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| CN1196624A (en) * | 1997-04-17 | 1998-10-21 | 深圳市华为技术有限公司 | Integrated service network based on HFC |
| CN1315789A (en) * | 2000-03-27 | 2001-10-03 | 四川诺尔实业(集团)有限公司 | Broad-band full-service integrated network access method |
| CN1398087A (en) * | 2001-07-12 | 2003-02-19 | 深圳市中兴通讯股份有限公司上海第二研究所 | Broad-band access system for MAN |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2005046129A1 (en) | 2005-05-19 |
| CN1615013A (en) | 2005-05-11 |
| CN1799223A (en) | 2006-07-05 |
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