CN1174581C - Long-distance transmission method for signals of Ethernet - Google Patents
Long-distance transmission method for signals of Ethernet Download PDFInfo
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- CN1174581C CN1174581C CNB001213148A CN00121314A CN1174581C CN 1174581 C CN1174581 C CN 1174581C CN B001213148 A CNB001213148 A CN B001213148A CN 00121314 A CN00121314 A CN 00121314A CN 1174581 C CN1174581 C CN 1174581C
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Abstract
The present invention discloses a method for transmitting Ethernet signals in a long distance, and the method is suitable for the existing transmission in the 10BASE-T Ethernet. The method mainly has the advantage that the output transformation ratio of a network interface transformer of an Ethernet exchanger is changed, and therefore, the transmission distance is lengthened, and network combination becomes convenient.
Description
The present invention relates to a kind of Ethernet transmission technique field, refer to a kind of transformer that makes the 10base-T ethernet signal increases transmission range to 200 meter on the 5th class unshielded twisted pair the long Distance Transmission of ethernet signal especially.
Along with the fast development of network application, the application of Ethernet is also increasingly extensive.The transmission range of ethernet signal is relevant with transmission medium, and the distance that different transmission mediums can transmit is different.Present Ethernet structure mostly uses the 5th class unshielded twisted pair as transmission medium, and its transmission rate is generally 10base-T, and so-called 10base-T is meant that transmission rate is 10Mbps.According to IEEE802.3--10BASE-T ethernet standard and telecommunications industry association/electronic industries association (TIA/EIA) standard, the standard transmission distance of 10base-T Ethernet on the 5th class unshielded twisted pair is 100 meters, and each present wiring installation is generally all followed this regulation.
The standard networking can bring inconvenience concerning a lot of users according to the rules, because often there are the network engineering personnel when making up Ethernet, to find, distance between two network equipments has exceeded the gauged distance that five class netting twines can transmit, they need think that various ways realize guaranteeing the long-distance transmissions of transmission quality, therefore cause many difficulties to engineering, brought some unnecessary troubles.Now, extending transmission distance and guaranteeing can't harm the most frequently used way of transmission is to use repeater, but so can make the network equipment more numerous and diverse, has not only brought inconvenience to the user, and has limited the scope of application of Ethernet, also can increase the cost of the network equipment simultaneously.
In view of this, the object of the present invention is to provide a kind of transformer of realizing the long Distance Transmission of ethernet signal, the transmission range of ethernet signal is increased, thereby expanded the scope of application of Ethernet, convenient for users, reduced the complexity of networking, also reduced equipment cost simultaneously.
For achieving the above object, the invention provides a kind of transformer of realizing the long Distance Transmission of ethernet signal, be arranged on the Ethernet switch that is used for the transmission of 10base-T Ethernet, the input of this transformer links to each other with the analog output of physical chip in the Ethernet switch, receives the differential signal of physical chip output; The output of this transformer links to each other with the twisted-pair feeder of peer end of the connection equipment, and key is: described transformer is the signal of 3.1V at the output output amplitude that links to each other with twisted-pair feeder.
Wherein, described transformer is that the output no-load voltage ratio is 1: 1.3 a net mouth transformer.Crosstalk in order to guarantee not have in the circuit, simultaneously in order to guarantee transmission quality, this transformer also further links to each other with described physical chip by the impedance matching circuit that can adjust the build-out resistor value.
The transformer of the long Distance Transmission of realization ethernet signal provided by the present invention, it is guaranteeing that signal finally drops under the situation in the receiving terminal marginal range, changed the output no-load voltage ratio of net mouth transformer, make the output voltage of transmitting terminal reach 3.1V, so, when using 5 class unshielded twisted pairs with the 10M speed rates, as long as the output of opposite equip. meets IEEE 802.3 standards or a little less than standard, can with apparatus interconnection of the present invention, and this transformer makes the transmission range of the 5th class unshielded twisted pair reach 200 meters, convenient with seasonal networking, reduced the complexity of networking, reduced equipment cost.
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The operation principle schematic diagram that Fig. 1 realizes for the present invention.
Find in the practical application of 10Base-T Ethernet transmission: the maximum constraints factor of 10base-T network segment distance is the intensity of signal, perhaps signal attenuation degree.In case signal is reduced under certain level, the 10base-T transceiver does not just receive it.The signal whistle of typical 10base-T transceiver receiving circuit suppresses level and is set to 300mV, it prevents the interference that the signal cross-talk between twisted-pair feeder causes by the received level of restricting signal, can be ignored by the signal that is lower than 300mV that cross-talk produces with the method.But this means that the network segment will quit work when real signal decaying on very long cut cable is lower than 300mV.Therefore, even the user uses the twisted-pair cable of the low decay of high-quality, and contain minimum connector and distributing frame in the network, but cable is long more, total signal attenuation just big more, very low even if the whistle of transceiver suppresses that level establishes, the 10base-T transceiver also can not receive signal.
Stipulate in the standard of IEEE 802.3: the single ended voltage of transmitting terminal when 100 Ω impedance loads is 2.2～2.8V; The reception voltage tolerant single ended voltage of receiving terminal is 585mV～3.1V; Noise margin＜264mV; Maximum transmitted loss＜11.5dB from the transmitting terminal to the receiving terminal.
The attenuation loss of typical 5 class lines under the 10MHz frequency is 6.5dB/100m, closely crosstalks to be-60dB, postpones to be 5.7ns/m.This shows that the principal element that influences signal transmission quality is an attenuation loss, is very little and crosstalk between line.
Calculate to find by theoretical value, the network equipment is not being done under the situation of any change, use the 5 class lines can reliable transmission 150 meters.As manage to make transmitting terminal output signal amplitude to reach 3.1V, then under 200 meters length, receiving terminal is normal received signal also.As shown in table 1:
| Line length (m) | Loss (comprising connector loss) (dB) | Transmission amplitude (V) | Reception amplitude (mV) |
| 100 | 8 | 2.8 | 1,115 |
| 2.2 | 876 | ||
| 150 | 11.5 | 2.8 | 745 |
| 2.2 | 585 | ||
| 200 | 14.5 | 2.8 | 527 |
| 2.2 | 414 | ||
| 3.1 | 585 |
Table 15 class UTP line length losses are to the influence of signal and the signal of transmitting terminal 3.1V also can not surpass the tolerance limit of receiving terminal when short range transmission.Therefore, using raising transmitting terminal amplitude output signal is feasible with the transmission range that increases by 5 class lines in theory.
Calculate according to above-mentioned theory, choose two concrete Ethernet switch S2403, two the Ethernet switch S2403 of 5 class lines connection with different length do actual test with the transmission rate of 10base-T, and table 2 has provided concrete measured data:
| Line length (m) | Loss (comprising connector loss) (dB) | Transmission amplitude (V) | Reception amplitude (mV) |
| 2 | 1 | 2.7 | 2,400 |
| 200 | 13 | 2.7 | 610 |
| 240 | 15 | 2.7 | 480 |
5 class lines of table 2 different length connect the 10M mouth of two S2403
Based on above-mentioned experiment, the operating state the when network interface card of further testing S2403 switch and different model uses 200 meters long 5 class unshielded twisted pairs to link to each other is tested and is shown that it can operate as normal.But, when the S2403 switch uses 240 meters long 5 class unshielded twisted pairs to be connected with same network interface card to test, not all network interface card can both with the S2403 normal communication.Yet, found through experiments the threshold level that the employed physical chip of S2403 switch 10M network interface can reduce received signal by outer meeting resistance, make the S2403 switch still can be correctly decoded.
Draw according to above-mentioned experiment and analysis, in order to guarantee to send reliability, will improve S2403 and send signal amplitude, promptly promote output signal voltage, the way of simple possible is the output no-load voltage ratio that changes net mouth transformer.The output no-load voltage ratio that the present invention calculates transformer according to experimental result changes 1: 1.3 into, and after the output no-load voltage ratio change of transformer, corresponding build-out resistor is change thereupon also.Simultaneously, in order to guarantee reception reliability, the threshold voltage in the time of can suitably regulating reception according to the length of transmission range, promptly when transmission range during greater than 100m, reduce the receive threshold voltage of S2403, but must be in critical field, promptly should be worth according to IEEE 802.3 standards should be less than 264mV.
Referring to shown in Figure 1, when use 200 meters of twisted-pair feeder transmission apart from the time, workflow during S2403 switch receiving and transmitting signal is such: when sending signal, analog output by the physical chip 11 of S2403 switch is exported a differential signal A, this signal A changes signal B by the output no-load voltage ratio at 1: 1.3 in net mouth transformer 13, and signal B exported on the twisted-pair feeder 14, transfer the signal to the by twisted-pair feeder 14 in the network equipment of opposite end.In addition, in order to guarantee not crosstalk on the transmission line, also in order to guarantee transmission quality, must accordingly change the impedance of build-out resistor at 1: 1.3 according to the output no-load voltage ratio in impedance matching circuit 12 simultaneously, the calculating of resistance value is according to basic voltage/resistance calculations formula.When received signal, the signal of the opposite end network equipment is sent in this S2403 switch by twisted-pair feeder 14, is sent to the input of physical chip 11 by net mouth transformer 13.Because the distance between two network equipments that link to each other will reach 200 meters, then corresponding signal attenuation will increase, therefore need suitably turn down receive threshold voltage by threshold voltage parameter in the adjusting S2403 switch according to the length of distance, to guarantee the reliable reception signal.
Through after the above-mentioned change, when with the networking of S2403/S2403F Ethernet switch, on the 10base-T port, no matter opposite equip. is LAN switch (LANSWITCH), hub (HUB) or network interface card, as long as it meets the standard of 10base-T, with the transmission of the 5th class unshielded twisted pair, distance can be supported from 0 meter to 200 meters.
Claims (3)
1, a kind of transformer of realizing the long Distance Transmission of ethernet signal, be arranged on the Ethernet switch that is used for the transmission of 10base-T Ethernet, the input of this transformer links to each other with the analog output of physical chip in the Ethernet switch, receives the differential signal of physical chip output; The output of this transformer links to each other with the twisted-pair feeder of peer end of the connection equipment, it is characterized in that: described transformer is the signal of 3.1V at the output output amplitude that links to each other with twisted-pair feeder.
2, transformer according to claim 1 is characterized in that, described transformer is that the output no-load voltage ratio is 1: 1.3 a net mouth transformer.
3, transformer according to claim 1 and 2 is characterized in that, described transformer further links to each other with described physical chip by the impedance matching circuit that can adjust the build-out resistor value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001213148A CN1174581C (en) | 2000-07-18 | 2000-07-18 | Long-distance transmission method for signals of Ethernet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001213148A CN1174581C (en) | 2000-07-18 | 2000-07-18 | Long-distance transmission method for signals of Ethernet |
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| Publication Number | Publication Date |
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| CN1334663A CN1334663A (en) | 2002-02-06 |
| CN1174581C true CN1174581C (en) | 2004-11-03 |
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| CNB001213148A Expired - Fee Related CN1174581C (en) | 2000-07-18 | 2000-07-18 | Long-distance transmission method for signals of Ethernet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3550777A4 (en) * | 2016-11-30 | 2019-11-27 | Hangzhou Hikvision Digital Technology Co., Ltd. | Ethernet switch and remote transmission method thereof |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433622C (en) * | 2005-12-14 | 2008-11-12 | 中兴通讯股份有限公司 | Device for long-distance transmitting Ethernet physical layer interface signal |
| CN101075882B (en) * | 2006-05-15 | 2010-04-21 | 杭州华三通信技术有限公司 | Ethernet transceiver and method for realizing signal long-distance transmission |
| CN101291232B (en) * | 2008-06-03 | 2010-09-29 | 北京星网锐捷网络技术有限公司 | Ethernet switch and signal receiving and sending method of Ethernet equipment |
| CN102307104A (en) * | 2011-09-02 | 2012-01-04 | 神州数码网络(北京)有限公司 | Method and device for controlling signal transmission power |
| CN105335303B (en) * | 2014-07-30 | 2019-02-05 | 联想(北京)有限公司 | A kind of information processing method and the first electronic equipment |
| CN106533996A (en) * | 2017-01-11 | 2017-03-22 | 深圳市立全鼎盛科技有限公司 | Network cable switch of extra long distance transmission |
| CN107395434A (en) * | 2017-08-20 | 2017-11-24 | 长沙曙通信息科技有限公司 | One kind lifting dedicated transmissions link network signal quality implementation method |
| CN108965434B (en) * | 2018-07-19 | 2020-01-31 | 苏州裕太车通电子科技有限公司 | distance-enhanced Ethernet transmission method |
| CN112602291B (en) * | 2018-08-27 | 2022-04-05 | 华为技术有限公司 | Communication device, system and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3550777A4 (en) * | 2016-11-30 | 2019-11-27 | Hangzhou Hikvision Digital Technology Co., Ltd. | Ethernet switch and remote transmission method thereof |
| US11005784B2 (en) | 2016-11-30 | 2021-05-11 | Hangzhou Hikvision Digital Technology Co., Ltd. | Ethernet switch and remote transmission method thereof |
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| CN1334663A (en) | 2002-02-06 |
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