CN101309152A - Ethernet switching system based on cable TV transmission network - Google Patents

Ethernet switching system based on cable TV transmission network Download PDF

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Publication number
CN101309152A
CN101309152A CNA2008100636454A CN200810063645A CN101309152A CN 101309152 A CN101309152 A CN 101309152A CN A2008100636454 A CNA2008100636454 A CN A2008100636454A CN 200810063645 A CN200810063645 A CN 200810063645A CN 101309152 A CN101309152 A CN 101309152A
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China
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pin
network
chip
cable
physical layer
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CNA2008100636454A
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Chinese (zh)
Inventor
周秀菊
陶琦
徐旭日
朱晓华
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HANGZHOU SHENGMAO TECHNOLOGY Co Ltd
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HANGZHOU SHENGMAO TECHNOLOGY Co Ltd
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Priority to CNA2008100636454A priority Critical patent/CN101309152A/en
Publication of CN101309152A publication Critical patent/CN101309152A/en
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Abstract

The invention relates to an Ethernet switching system based on the CATV cable transmission network. The technical problem solved by the invention is to provide an Ethernet switching system which has the advantages of the lowest access cost, the simplest engineering reform and stable performance. The technical proposal includes that the Ethernet switching system based on the CATV cable transmission network comprises a local end device and a terminal device, and is characterized in that the local end is composed of a local end power supply, an RJ45 network interface, a link state indication part, an Ethernet switching control part, a physical layer interface circuit, a network transformer, a low pass filter, a high pass filter, a coaxial cable terminal, a CATV signal distributor, a local system configuration part and a local control port; the terminal device comprises a passive client and an active client. The Ethernet switching system based on the CATV cable transmission network is applicable to the last a hundred meters centralized distribution access part in the bidirectional reform of the broadcast television network and realizes the starting of the user broadband service or the video on demand (VOD) television interaction service.

Description

Ethernet switching system based on cable TV transmission network
Technical field
The present invention relates to digital exchange field and field of signal transmissions, especially a kind of ethernet switching system based on cable TV transmission network, promptly adopted the ethernet switching system of present comparative maturity at the exchange neighborhood system, broken through the mode of thinking that traditional Ethernet adopts 5 class unshielded twisted pairs or Optical Fiber Transmission medium at transmission field, propose with cable television line (coaxial cable) medium do not influence have cable television service now and carry out in, carry out the transmission of Ethernet (broadband) data.
The present invention is applicable in the CHINA RFTCOM Co Ltd bidirectional rebuilding and concentrates distribution to insert part for last hundred meters, realize opening or video request program (VOD) interactive TV service of consumer wideband business, also be very suitable for simultaneously each hotel simply engineered to the guest room, realize the open-minded of guest room broadband services, also most suitable for private network transformations such as office, school, railway, public security, project installation is simple, plug and play, flexible, network management realizes remote monitoring.
Background technology
Source technology is arranged, used for many years in the North America as CMTS (Cable Modem Termination System) technology, it is to follow the DOCSIS agreement, by signal being carried out the QPSK/QAM modulation, low frequency end at HFC (Hybrid Fiber-Coax) network carries out transmitted in both directions, the basic function of the Cable Modem of user side is modulated into digital uplink signal the RF signal exactly, descending RF signal is demodulated into digital signal, from the MPEG-TS Frame, extract data, form the data of Ethernet, by the output of 10Base-T Ethernet interface, thereby the broadband services of realization coaxial transmission medium is mutual; But traditional DOCSIS technology limited bandwidth, the maximum shared downlink bandwidth that 40M only can be provided, certainly can not satisfy increasing multimedia application demand, simultaneously for China, this Technology Need bidirectional rebuilding, construction investment is bigger, the cost height, it uses in the star of putting multiple spot/tree-like coax network, has the problem of the congested and upstream noise serious interference (funneling effect) of uplink band.What therefore this technology was carried out at home is not smooth, under each tame technology pincer attack that let a hundred flowers blossom and a hundred schools of thought contend, is not expected basically at present.But the release of DOCSIS3.0, adopted the band channel binding technology, ordinary circumstance can 4 channel bondings together, can reach 160M by downlink bandwidth, upstream bandwidth reaches as high as 120M, overcome the deficiency of CMTS bandwidth, but up to the present, also do not have the product of DOCSIS3.0 to release, have only the release of accurate DOCSIS3.0 product, substantially realized the function of DOCSIS3.0, but cost is higher.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of ethernet switching system based on cable TV transmission network is provided, be intended to utilize cheapest cost of access, the most easy to be engineered, the most stable exchange transmission system, the service management of most convenient, solve the last 100M Ethernet of user broadband IP data, utilize the cable transmission altogether of the existing coaxial cable TV network that extensively covers, finally realize the access of consumer wideband and two-way interaction television services.
The technical solution adopted in the present invention is: a kind of ethernet switching system based on cable TV transmission network, comprise local side apparatus and terminal equipment, it is characterized in that described local side apparatus exchanges control section, physical layer interface circuit, network transformer, low pass filter, high pass filter, coaxial cable terminations, cable TV signal distributor, local system configuration section and local control mouth by local supply, RJ45 network interface, Link State indicating section, Ethernet and forms; Wherein, one has a lot of social connections is with network signal to insert from the RJ45 network interface, the output termination physical layer interface circuit of network interface, this physical layer interface circuit is connected with Ethernet exchange control section and network transformer simultaneously, and the output of described network transformer arrives coaxial cable terminations through low pass filter; Another road cable TV signal arrives coaxial cable terminations from the input of cable TV signal distributor through high pass filter; Described Ethernet exchange control section outputting communication signal is to Link State indicating section and local system configuration section, and this local system configuration section connects local control mouth; Local supply provides the galvanic current source for each module of local side apparatus; The mixed signal of exporting from the coaxial cable terminations of local side apparatus is input to terminal equipment by cable tv coax.
Described terminal equipment is a passive family end, is connected to user PC computer terminal from its low frequency part of mixed signal of coaxial cable terminations through low pass filter, network transformer, RJ45 socket; HFS is connected to user TV television terminal through high pass filter and TV signal delivery outlet.
Described terminal equipment is an active family end, low frequency part from mixed signal in the coaxial cable terminations is input to physical layer exchange master chip through low pass filter, the output signal of master chip is connected to the mixed signal delivery outlet of active family end again through network transformer and low pass filter, described physical layer exchange master chip also connects family end power supply, pin configuration, Link State indicating section and RJ45 network interface simultaneously; Transport to the mixed signal delivery outlet of active family end successively through high pass filter, cable TV signal two distributors, high pass filter from the HFS of mixed signal in the coaxial cable terminations.
Described Ethernet exchange control section is mainly a main control chip U 19, the physical layer interface circuit that joins with main control chip has two physical layer interface chip U 7And U 8, wherein, main control chip U 19On data exchange interface pin 106~111, pin 116~126 and U 7Pin 109,106,101,98,95,92,87,84,82,80,77,74,71,66,63,58,55 be connected main control chip U 19On data exchange interface pin 2,3,4,5,6,7,8,9,11,12,13,20,21,22,23,24,27 and U 8Pin 109,106,101,98,95,92,87,84,82,80,77,74,71,66,63,58,55 be connected main control chip U 19By pin 127 reference clock is outputed to U 7Pin 52, main control chip U simultaneously 19By pin 28 reference clock is outputed to U 8Pin 52, main control chip U 19The pin 102 of single-chip microcomputer configured port link to each other main control chip U with pin 101 with the pin 16 and the pin 17 of local system configuration section 19Pin 99 be connected main control chip U with the corresponding pin 1 of Link State indicating section 19Pin 100 be U with the corresponding pin of Link State indicating section respectively 9And U 12Pin 8 be connected main control chip U 19Pin 104 and pin 105 respectively with physical layer interface chip U 7Corresponding pin 112 be connected with pin 111, be used for the control signal communication.
Described network transformer has one group, wherein a part and physical layer interface circuit chips U 7Be connected the chip U in another part and the physical layer interface circuit 8Be connected, be specially chip U 7Pin 1~4, pin 6~9, pin 11~14, pin 16~19, pin 20~23, pin 25~28 respectively with network transformer in T 3, T 2, T 1, T 4, T 5, T 6Be connected U 7The pin 6 of pin 30~33 and RJ45 network interface A, pin 3 A, pin 2 A, pin 1 ABe connected the pin 6 (TXON8) of RJ45 network interface, pin 3 (TXOP8), pin 2 (RXIN8), pin 1 (RXIP8) and physical layer interface circuit chips U 8Pin 1~4 be connected chip U 8Pin 6~9, pin 11~14, pin 16~19, pin 20~23, pin 25~28, pin 30~33 and network transformer T 7, T 8, T 9, T 12, T 11, T 10Be connected; With chip U 7And chip U 8Be connected to low pass filter after the output pin 9 of each network transformer that links to each other and pin 10 parallel connections.
Described network transformer is used to make the transmission of network signal to transform to two wires, impedance matching and Echo Cancellation from four lines, and each network transformer is by isolating transformer TX 1, TX 2With line transformer TX 3Form, the input of four lines shows as TX 1Pin 1, pin 2 and TX 2Pin 6, pin 5 inputs, and these two pairs of pin are by data wire and physical layer interface circuit chips U 7And U 8Be connected, the two wires is output as TX 3Pin 9, pin 10 and common ground output pin 8, pin 11.
Described network transformer is used to make the transmission of network signal to transform to two wires, impedance matching and Echo Cancellation from four lines, and each network transformer is by isolating transformer TX 1, TX 2With line transformer TX 3Form, the input of four lines shows as TX 1Pin 1, pin 2 and TX 2Pin 6, pin 5 inputs, and these two pairs of pin are by data wire and physical layer interface circuit chips U 7And U 8Be connected, the two wires is output as TX 3Pin 9, pin 10 and common ground output pin 8, pin 11.
Described active family end comprises physical layer exchange master chip U 100Its data exchange interface pin 2,3,5,6, pin 9,10,12,13 connect the pin 17,16,15,14 and the pin 4,3,2,1 of two RJ45 interfaces in the RJ45 network interface respectively; Master chip U 100Pin 16,17,19,20, pin 23,24,26,27, pin 30,31,33,34 meets network transformer N respectively 1, N 2, Nin1, network transformer N 1, N 2Output pin 9 and pin 10 parallel connections after be connected to the input pin 1 of low pass filter, the pin 9 of network transformer Nin1 and the pin in parallel of pin 10 are signal input pin; Master chip U 100Pin 103,104,108,109,113,114,98,97,93,92 chain link line state indicating sections.
The invention has the beneficial effects as follows: the present invention adopts Ethernet data signal IP DATA and cable TV signal TV RF radiofrequency signal the technology of frequency division multiplexing, making two signals is transmission at same coaxial cable, standard according to China's cable TV network frequency division, with the band transmissions of ethernet signal below 50M, Radio and the frequency band transmission of RF TV signal more than 87M, realized altogether cable transmission and not disturbing mutually of dual signal, the broadcasting and TV HFC Hybrid Fiber Coaxial that has utilized China to cover fully on a large scale, realized the broadband data transmission of extensive use at present, IP DATA and RF TV mixed signal have been delivered to huge numbers of families.The present invention compared with prior art stability and the reliability of system improves greatly, and system cost is cheap, and project installation is simple, and centralized Remote Management of Network is provided, and has improved the network operation ability of operator greatly.
Description of drawings
Fig. 1 is the circuit block diagram of local side apparatus of the present invention.
Fig. 2 is the circuit block diagram of the passive family end of terminal equipment of the present invention.
Fig. 3 is the circuit block diagram of the active family end of terminal equipment of the present invention.
Fig. 4 is the electrical schematic diagram of Ethernet exchange control section main control chip in the local side apparatus.
Fig. 5 is the electrical schematic diagram of physical layer interface circuit chip U7 and subnetwork transformer in the local side apparatus.
Fig. 6 is the electrical schematic diagram of physical layer interface circuit chip U8 and subnetwork transformer in the local side apparatus.
Fig. 7 is the electrical schematic diagram of power unit in the local side apparatus.
Fig. 8 is the electrical schematic diagram of local system configuration section in the local side apparatus.
Fig. 9 is the electrical schematic diagram of Link State indicating section in the local side apparatus.
Figure 10 is the electrical schematic diagram of active family end.
Figure 11 is the electrical schematic diagram of physical layer exchange master chip in the end of active family.
Figure 12 is the electrical schematic diagram of network transformer and LED link state indicator in the end of active family.
Figure 13 is the electrical schematic diagram of power unit in the end of active family.
Figure 14 is the structure chart of network transformer of the present invention.
Figure 15 is the schematic diagram of high pass filter of the present invention.
Figure 16 is the schematic diagram of low pass filter of the present invention.
Figure 17 is the structural representation of one embodiment of the invention.
Embodiment
Switching system of the present invention comprises local side apparatus and terminal equipment, and local side apparatus refers to the equipment that is installed in the corridor head end, and terminal equipment refers to the equipment that is installed in every household, and this terminal equipment is divided into passive family end and active family end again.
Embodiment 1, and this example is the combination of local side apparatus and passive family end:
As shown in Figure 1, this routine described local side apparatus is made up of local supply 3, RJ45 network interface 4, Link State indicating section 5, Ethernet exchange control section 6, physical layer interface circuit 7, network transformer 8, low pass filter 9, high pass filter 10, coaxial cable terminations 11, cable TV signal distributor 12, local system configuration section 13 and local control mouth 14.Wherein, one has a lot of social connections band network signal (IP DATA) 1 from 4 accesses of RJ45 network interface, the output termination physical layer interface circuit 7 of network interface, this physical layer interface circuit 7 is connected with Ethernet exchange control section 6 and network transformer 8 simultaneously, and the output of described network transformer 8 arrives coaxial cable terminations 11 through low pass filter 9; Another road cable TV signal (RFTV) 2 arrives coaxial cable terminations 11 from 12 inputs of cable TV signal distributor through high pass filter 10.Described Ethernet exchange control section 6 outputting communication signals are to Link State indicating section 5 and local system configuration section 13, and this local system configuration section 13 connects local control mouth 14.Local supply 3 provides the galvanic current source for each module of local side apparatus.The mixed signal of exporting from the coaxial cable terminations 11 of local side apparatus (TV+DATA) is input to terminal equipment (passive family end) by cable tv coax.
As shown in Figure 4, described Ethernet exchange control section 6 is mainly a main control chip U 19(model RTL8316B/BP), the physical layer interface circuit 7 that joins with main control chip has two physical layer interface chip U 7(model RTL8208B-1) and U 8(model RTL8208B-2).Wherein, main control chip U 19On data exchange interface pin 106~111, pin 116~126 and U 7Pin 109,106,101,98,95,92,87,84,82,80,77,74,71,66,63,58,55 be connected; Main control chip U 19On data exchange interface pin 2,3,4,5,6,7,8,9,11,12,13,20,21,22,23,24,27 and U 8Pin 109,106,101,98,95,92,87,84,82,80,77,74,71,66,63,58,55 be connected.Main control chip U 19By pin 127 reference clock is outputed to U 7Pin 52, main control chip U simultaneously 19By pin 28 reference clock is outputed to U 8Pin 52.Main control chip U 19The pin 102 (SDA) of single-chip microcomputer configured port link to each other with the pin 16 and the pin 17 of local system configuration section 13 with pin 101 (SCK).Main control chip U 19Pin 99 (SLED DATA) be connected main control chip U with the corresponding pin 1 of Link State indicating section 5 19Pin 100 (SLED CLK) be U with the corresponding pin of Link State indicating section 5 respectively 9And U 12Pin 8 be connected.Main control chip U 19Pin 104 (MDC) and pin 105 (MDIO) respectively with physical layer interface chip U 7Corresponding pin 112 be connected with pin 111, be used for the control signal communication.
As Fig. 5, shown in Figure 6, described network transformer 8 has 12, wherein 6 and physical layer interface circuit 7 chips U 7Be connected, other 6 with physical layer interface circuit 7 in chip U 8Be connected.Be specially chip U 7Pin 1~4, pin 6~9, pin 11~14, pin 16~19, pin 20~23, pin 25~28 respectively with network transformer 8 in T 3, T 2, T 1, T 4, T 5, T 6Be connected, connect the pin 6,5,2,1 of each network transformer, meet power vd DA after pin 4 and pin 3 parallel connections.Chip U 7The pin 6 of pin 30~33 and RJ45 network interface 4 A, pin 3 A, pin 2 A, pin 1 ABe connected the pin 6 (TXON8) of RJ45 network interface, pin 3 (TXOP8), pin 2 (RXIN8), pin 1 (RXIP8) and physical layer interface circuit 7 chips U 8Pin 1~4 be connected.Chip U 8Pin 6~9, pin 11~14, pin 16~19, pin 20~23, pin 25~28, pin 30~33 and network transformer T 7, T 8, T 9, T 12, T 11, T 10Being connected, is the pin 6,5,2,1 that connects each network transformer equally.With chip U 7And chip U 8Be connected to low pass filter 9 after the output pin 9 of each network transformer that links to each other and pin 10 parallel connections.
As shown in figure 14, described network transformer 8 is used to make the transmission of network signal to transform to the two wires from four lines, and impedance matching and Echo Cancellation, and each network transformer 8 is by two isolating transformer TX 1, TX 2With a line transformer TX 3Form.The input of four lines shows as TX 1Pin 1, pin 2 and TX 2Pin 6, pin 5 inputs, these two pairs of pin are by data wire and physical layer interface circuit 7 chips U 7And U 8Be connected TX 1Pin 3 and TX 2Pin 4 be the bias voltage input, the two wires is output as TX 3Pin 9, pin 10 and common ground output pin 8, pin 11.The operation principle of network transformer 8 is: two signals are input to pin 1,2 and 6,5 two pairs of pin of pin respectively, and signal is through isolating transformer TX 1And TX 2Isolate, output to 7,8 two pairs of pin of pin 11,12 and pin, two pairs of signals in pin 12 and the pin 7 are linked into line transformer TX 3It is synthetic to carry out signal, and from pin 10,9 outputs, pin 8 and 11 is common ground output.
Shown in Figure 15 is the high pass filter 10 that this example is used, and is the Passive LC high pass filter, and its passband design is at 87M~1000MHz, and is connected in series respectively on each branch road of catv distributor.Shown in Figure 16 is Passive LC low pass filter 9, and it guarantees the passband of low pass part at 0~50MHz when circuit design, and their band all has the decay greater than 50dB outward.Above-mentioned high and low pass filter has guaranteed the mutual isolation between broadband signal and the TV signal, and the phase mutual interference between their branch roads, has ensured the proper communication of each delivery outlet effectively.
The power supply 3 that shown in Figure 7 is in the local side apparatus, it provides the DC power supply P33VDD of 3.3V.
Shown in Figure 8 is local system configuration section 13 and local control mouth 14 in the local side apparatus, mainly comprises level transferring chip U in the local system configuration section 1, single-chip microcomputer U 3And storage chip U 4Local control mouth is a connector J 5, its pin 4 and pin 5 meet U respectively 1Pin 8 and pin 13, U 1Output pin 9 and pin 11 meet U respectively 3Input pin 2 and pin 3, U 3Output pin 16 and pin 17 respectively with U 4Pin 5 and pin 6 parallel connections after be connected to main control chip U 19Pin 102 and pin 101.
Shown in Figure 9 is Link State indicating section 5 in the local side apparatus, and it mainly comprises condition indicative signal string and conversion chip U 9And U 12And some groups of light-emitting diodes, wherein, U 9Pin 2~6, pin 10~13, and U 12Pin 1, pin 3~6, the negative pole of pin 10~13 sending and receiving optical diodes, U 9Pin 13 and U 12Pin 1 be connected U 9Pin 1 meet main control chip U 19Pin 99, U 9Pin 8 and U 12Pin 8 all meet main control chip U 19Pin 100; The positive pole of each light-emitting diode is connected with supply voltage P33VDD by resistance.
The terminal equipment that this is routine, promptly passive family end are connected to user PC computer terminal from its low frequency part of mixed signal of coaxial cable terminations 11 through low pass filter 9, network transformer 8, RJ45 socket 15 as shown in Figure 2; HFS is connected to user TV television terminal through high pass filter 10 and TV signal delivery outlet.
Embodiment 2, and this example is the combination of local side apparatus and active family end:
Because the structure of local side apparatus is identical with embodiment's 1, this example is repeated description no longer, and highlights the structure of active family end.
Terminal equipment shown in Figure 3 promptly is an active family end, be input to physical layer exchange master chip 16 from the low frequency part of mixed signal in the coaxial cable terminations 11 through low pass filter 9, the output signal of master chip is connected to the mixed signal delivery outlet 18 of active family end again through network transformer 8 and low pass filter 9.Described physical layer exchange master chip 16 also connects family end power supply 19, pin configuration 20, Link State indicating section 21 and RJ45 network interface 4 simultaneously.Transport to the mixed signal delivery outlet 18 of active family end successively through high pass filter 10, cable TV signal two distributors 17, high pass filter 10 from the HFS of mixed signal in the coaxial cable terminations 11.See also Figure 10, this example has a high pass filter HP IN1 and a low pass filter LP IN1 at mixed signal input port place, in the prime of mixed signal delivery outlet 2 high pass filter HP1 and HP2 is arranged, and 2 low pass filter LP1 and LP2.
As Figure 11, shown in Figure 12, described active family end comprises physical layer exchange master chip U 100(model RTL8306S/SD/SDM) its data exchange interface pin 2,3,5,6, pin 9,10,12,13 connect the pin 17,16,15,14 and the pin 4,3,2,1 of two RJ45 interfaces in the RJ45 network interface 4 respectively; Master chip U 100Pin 16,17,19,20, pin 23,24,26,27, pin 30,31,33,34 meets network transformer N respectively 1, N 2, Nin1, network transformer N 1, N 2Output pin 9 and pin 10 parallel connections after be connected to the input pin 1 of low pass filter, the pin 9 of network transformer Nin1 and the pin in parallel of pin 10 are signal input pin; Master chip U 100Pin 103,104,108,109,113,114,98,97,93,92 chain link line state indicating sections 21.Link State indicating section 21 is one group of light-emitting diode, and its positive pole meets power supply DVDD33, and negative pole is connected by the pin 23,25,10,12 of resistance with two RJ45 interfaces.
Shown in Figure 13 is family end power supply 19, the direct voltage of this power module output 1.8V and 3.3V.
Operation principle of the present invention please refer to Figure 17, provides Ethernet to insert route by gateway, carries out the Ethernet exchange in system, under the configuration of ethernet management control system, provides the platform of an exchange for the access of broadband ethernet.In the cable TV part, continue to continue to use the existing cable TV network of China's broadcasting and TV, the cable TV radiofrequency signal of national standard is provided to equipment, by traditional distributor, carry out the power division of TV signal, each road cable TV signal after the distribution is connected in series corresponding high-pass filtering circuit respectively, the Ethernet broadband signal of having carried out impedance conversion and coupling with each road respectively and being connected in series low-pass filter circuit is carried out frequency division multiplexing, is modulated to the common cable transmission that realizes Ethernet data and cable TV signal on the cable tv coax transmission medium; This mixed signal is transferred to user terminal by cable television network or coaxial cable, by user terminal is adaptive mixed signal being separated, finishes the access of cable TV signal and broadband signal.

Claims (10)

1, a kind of ethernet switching system based on cable TV transmission network, comprise local side apparatus and terminal equipment, it is characterized in that: described local side apparatus is made up of local supply (3), RJ45 network interface (4), Link State indicating section (5), Ethernet exchange control section (6), physical layer interface circuit (7), network transformer (8), low pass filter (9), high pass filter (10), coaxial cable terminations (11), cable TV signal distributor (12), local system configuration section (13) and local control mouthful (14); Wherein, one has a lot of social connections is with network signal (1) to insert from RJ45 network interface (4), the output termination physical layer interface circuit (7) of network interface, this physical layer interface circuit (7) is connected with Ethernet exchange control section (6) and network transformer (8) simultaneously, and the output of described network transformer (8) arrives coaxial cable terminations (11) through low pass filter (9); Another road cable TV signal (2) arrives coaxial cable terminations (11) from cable TV signal distributor (12) input through high pass filter (10); Described Ethernet exchange control section (6) outputting communication signal is to Link State indicating section (5) and local system configuration section (13), and this local system configuration section (13) connects local control mouthful (14); Local supply (3) provides the galvanic current source for each module of local side apparatus; The mixed signal of exporting from the coaxial cable terminations (11) of local side apparatus is input to terminal equipment by cable tv coax.
2, the ethernet switching system based on cable TV transmission network according to claim 1, it is characterized in that: described terminal equipment is a passive family end, is connected to user PC computer terminal from its low frequency part of mixed signal of coaxial cable terminations (11) through low pass filter (9), network transformer (8), RJ45 socket (15); HFS is connected to user TV television terminal through high pass filter (10) and TV signal delivery outlet.
3, ethernet switching system based on cable TV transmission network according to claim 1, it is characterized in that: described terminal equipment is an active family end, low frequency part from mixed signal in the coaxial cable terminations (11) is input to physical layer exchange master chip (16) through low pass filter (9), the output signal of master chip is connected to the mixed signal delivery outlet (18) of active family end again through network transformer (8) and low pass filter (9), described physical layer exchange master chip (16) also connects family end power supply (19) simultaneously, pin configuration (20), Link State indicating section (21) and RJ45 network interface (4); Transport to the mixed signal delivery outlet (18) of active family end successively through high pass filter (10), cable TV signal two distributors (17), high pass filter (10) from the HFS of mixed signal in the coaxial cable terminations (11).
4, according to claim 1 or 2 or 3 described ethernet switching systems based on cable TV transmission network, it is characterized in that: described Ethernet exchange control section (6) is mainly a main control chip U 19, the physical layer interface circuit (7) that joins with main control chip has two physical layer interface chip U 7And U 8, wherein, main control chip U 19On data exchange interface pin 106~111, pin 116~126 and U 7Pin 109,106,101,98,95,92,87,84,82,80,77,74,71,66,63,58,55 be connected main control chip U 19On data exchange interface pin 2,3,4,5,6,7,8,9,11,12,13,20,21,22,23,24,27 and U 8Pin 109,106,101,98,95,92,87,84,82,80,77,74,71,66,63,58,55 be connected main control chip U 19By pin 127 reference clock is outputed to U 7Pin 52, main control chip U simultaneously 19By pin 28 reference clock is outputed to U 8Pin 52, main control chip U 19The pin 102 of single-chip microcomputer configured port link to each other main control chip U with pin 101 with the pin 16 and the pin 17 of local system configuration section (13) 19Pin 99 be connected main control chip U with the corresponding pin 1 of Link State indicating section (5) 19Pin 100 be U with the corresponding pin of Link State indicating section (5) respectively 9And U 12Pin 8 be connected main control chip U 19Pin 104 and pin 105 respectively with physical layer interface chip U 7Corresponding pin 112 be connected with pin 111, be used for the control signal communication.
5, according to claim 1 or 2 or 3 described ethernet switching systems based on cable TV transmission network, it is characterized in that: described network transformer (8) has one group, wherein a part and physical layer interface circuit (7) chips U 7Be connected the chip U in another part and the physical layer interface circuit (7) 8Be connected, be specially chip U 7Pin 1~4, pin 6~9, pin 11~14, pin 16~19, pin 20~23, pin 25~28 respectively with network transformer (8) in T 3, T 2, T 1, T 4, T 5, T 6Be connected U 7The pin 6 of pin 30~33 and RJ45 network interface (4) A, pin 3 A, pin 2 A, pin 1 ABe connected the pin 6 (TXON8) of RJ45 network interface, pin 3 (TXOP8), pin 2 (RXIN8), pin 1 (RXIP8) and physical layer interface circuit (7) chips U 8Pin 1~4 be connected chip U 8Pin 6~9, pin 11~14, pin 16~19, pin 20~23, pin 25~28, pin 30~33 and network transformer T 7, T 8, T 9, T 12, T 11, T 10Be connected; With chip U 7And chip U 8Be connected to low pass filter (9) after the output pin 9 of each network transformer that links to each other and pin 10 parallel connections.
6, the ethernet switching system based on cable TV transmission network according to claim 4, it is characterized in that: described network transformer (8) is used to make the transmission of network signal to transform to two wires, impedance matching and Echo Cancellation from four lines, and each network transformer (8) is by isolating transformer TX 1, TX 2With line transformer TX 3Form, the input of four lines shows as TX 1Pin 1, pin 2 and TX 2Pin 6, pin 5 inputs, and these two pairs of pin are by data wire and physical layer interface circuit (7) chips U 7And U 8Be connected, the two wires is output as TX 3Pin 9, pin 10 and common ground output pin 8, pin 11.
7, the ethernet switching system based on cable TV transmission network according to claim 5, it is characterized in that: described network transformer (8) is used to make the transmission of network signal to transform to two wires, impedance matching and Echo Cancellation from four lines, and each network transformer (8) is by isolating transformer TX 1, TX 2With line transformer TX 3Form, the input of four lines shows as TX 1Pin 1, pin 2 and TX 2Pin 6, pin 5 inputs, and these two pairs of pin are by data wire and physical layer interface circuit (7) chips U 7And U 8Be connected, the two wires is output as TX 3Pin 9, pin 10 and common ground output pin 8, pin 11.
8, the ethernet switching system based on cable TV transmission network according to claim 3 is characterized in that: described active family end comprises physical layer exchange master chip U 100Its data exchange interface pin 2,3,5,6, pin 9,10,12,13 connect the pin 17,16,15,14 and the pin 4,3,2,1 of two RJ45 interfaces in the RJ45 network interface (4) respectively; Master chip U 100Pin 16,17,19,20, pin 23,24,26,27, pin 30,31,33,34 meets network transformer N respectively 1, N 2, Nin1, network transformer N 1, N 2Output pin 9 and pin 10 parallel connections after be connected to the input pin 1 of low pass filter, the pin 9 of network transformer Nin1 and the pin in parallel of pin 10 are signal input pin; Master chip U 100Pin 103,104,108,109,113,114,98,97,93,92 chain link line state indicating sections (21).
9, the ethernet switching system based on cable TV transmission network according to claim 4 is characterized in that: described active family end comprises physical layer exchange master chip U 100Its data exchange interface pin 2,3,5,6, pin 9,10,12,13 connect the pin 17,16,15,14 and the pin 4,3,2,1 of two RJ45 interfaces in the RJ45 network interface (4) respectively; Master chip U 100Pin 16,17,19,20, pin 23,24,26,27, pin 30,31,33,34 meets network transformer N respectively 1, N 2, Nin1, network transformer N 1, N 2Output pin 9 and pin 10 parallel connections after be connected to the input pin 1 of low pass filter, the pin 9 of network transformer Nin1 and the pin in parallel of pin 10 are signal input pin; Master chip U 100Pin 103,104,108,109,113,114,98,97,93,92 chain link line state indicating sections (21).
10, the ethernet switching system based on cable TV transmission network according to claim 5 is characterized in that: described active family end comprises physical layer exchange master chip U 100Its data exchange interface pin 2,3,5,6, pin 9,10,12,13 connect the pin 17,16,15,14 and the pin 4,3,2,1 of two RJ45 interfaces in the RJ45 network interface (4) respectively; Master chip U 100Pin 16,17,19,20, pin 23,24,26,27, pin 30,31,33,34 meets network transformer N respectively 1, N 2, Nin1, network transformer N 1, N 2Output pin 9 and pin 10 parallel connections after be connected to the input pin 1 of low pass filter, the pin 9 of network transformer Nin1 and the pin in parallel of pin 10 are signal input pin; Master chip U 100Pin 103,104,108,109,113,114,98,97,93,92 chain link line state indicating sections (21).
CNA2008100636454A 2008-06-20 2008-06-20 Ethernet switching system based on cable TV transmission network Pending CN101309152A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN105829901A (en) * 2014-08-13 2016-08-03 华为技术有限公司 Fault analysis method and device
CN106374306A (en) * 2016-08-26 2017-02-01 浙江大华技术股份有限公司 Passive coaxial network converter and power over Ethernet system
CN107104873A (en) * 2017-04-18 2017-08-29 珠海数字动力科技股份有限公司 A kind of community local area network group network system based on carrier equipment
US11201442B2 (en) 2016-08-26 2021-12-14 Zhejiang Dahua Technology Co., Ltd. Power over ethernet system, device, and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105829901A (en) * 2014-08-13 2016-08-03 华为技术有限公司 Fault analysis method and device
US10257018B2 (en) 2014-08-13 2019-04-09 Huawei Technologies Co., Ltd. Failure analysis method and device
CN105829901B (en) * 2014-08-13 2019-06-21 华为技术有限公司 A kind of failure analysis methods and equipment
CN106374306A (en) * 2016-08-26 2017-02-01 浙江大华技术股份有限公司 Passive coaxial network converter and power over Ethernet system
CN106374306B (en) * 2016-08-26 2019-02-12 浙江大华技术股份有限公司 A kind of passive coaxial network converter and Power over Ethernet system
US11201442B2 (en) 2016-08-26 2021-12-14 Zhejiang Dahua Technology Co., Ltd. Power over ethernet system, device, and method
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