CN1508983A - Inter face for realizing automatic impedance matching and method thereof - Google Patents
Inter face for realizing automatic impedance matching and method thereof Download PDFInfo
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- CN1508983A CN1508983A CNA021544999A CN02154499A CN1508983A CN 1508983 A CN1508983 A CN 1508983A CN A021544999 A CNA021544999 A CN A021544999A CN 02154499 A CN02154499 A CN 02154499A CN 1508983 A CN1508983 A CN 1508983A
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Abstract
The interface comprises transmission cable and linker as well as impedance matching interface circuit. The cable and linker connects device at opposite device with the device in local device. Based on types of cable and id signal output from the linker, impedance matching is carried out for local device by the impedance matching interface circuit. First, the invention builds a mapping list between impedance of local device and matched impedance of cable and types. Impedance and type of cable is read out, and then matched value of impedance of local device is found out from the mapping list. Control of turning on/off resistance connected to the local device makes impedance of the local device match to impedance and type of cable. The invented interface and method can recognize impedance and type of cable with same impedance of opposite device so that different impedances are output in order to make impedances matched between opposite device and local device.
Description
Technical field
The present invention relates to a kind of the impedance interface and method thereof of coupling automatically of realizing, belong to the communication equipment technical field.
Background technology
On router or the Ethernet switch, the E1 interface that adheres to European standard separately and the T1 interface of North America standard need be supported the cable of different impedances, E1 interface wherein need be supported 120 Ω impedance cables and 75 Ω impedance cables usually, and the T1 interface need be supported 100 Ω impedance cables.For equipment manufacturers, both unified manufacturing cost and maintenance costs that more help reducing product.And for the E1 interface, owing to there is the cable of 120 Ω and two kinds of impedances of 75 Ω, all have the communication equipment of supporting different impedance cable interfaces in the market, need carry out manual configuration at the impedance of employed cable resistance docking port usually.The method of manual configuration interface impedance is when design, increases the configuration design to port Impedance, for example increases plucking number sign switch.Module by user or the visual cable resistance type of technical staff, is passed through the impedance of the diverse location configuration interface of plucking number sign switch then when using.In this case, at first be to adopt visual means to carry out cable identification to make mistakes easily, especially the cable outer appearnce like or cable do not have under the situation of label; To be that manual configuration is easier make mistakes for next, under the situation of a lot of impedance type of interface support cable, is easy to because the human error causes impedance not match.Therefore, manual configuration is not a kind of reliable collocation method, and manual configuration is inaccurate often to cause not matching of impedance.Not matching of transfer impedance, the consequence of bringing are the shortening of signal transmission distance, the increase of transmission power consumption and the reduction of signal antijamming capability.
In order to address the above problem, some manufacturers make communication module respectively at different impedance type of cables, and the interface section of module is designed separately.For example only support the E1 module of 75 Ω cables, 120 Ω cables, just need to make 75 Ω E1 interface modules, 120 Ω E1 interface modules if split.Like this, a kind of port type has derived a plurality of modules, has not only increased manufacturing cost, and also giving to produce with maintenance has increased complexity.
Summary of the invention
The objective of the invention is to propose a kind of the impedance interface and method thereof of coupling automatically of realizing, when communication equipment need be supported the interface of multiple impedance standard cable, can discern the impedance of cable automatically, and the impedance of automatic butt mouth is configured, interface circuit impedance and cable resistance are mated automatically, reduce the unmatched risk of impedance that the manual configuration port Impedance is brought.
The realization impedance that the present invention proposes is the interface of coupling automatically, comprising:
Be used to transmission cable that local terminal equipment is connected with opposite equip.;
Be used to transmission cable connector that transmission cable is connected with local terminal equipment;
Be used for the identification information according to the output of transmission cable connector, to the impedance matching interface circuit that local terminal equipment carries out impedance matching, it links to each other with the transmission cable connector.
Identification information in the above-mentioned interface comprises transmission cable type and resistance value information.
The resistance value of the transmission cable in the above-mentioned interface is identical with the resistance value of opposite equip..
Transmission cable connector in the above-mentioned interface comprises:
Be used to make the id signal line to be in the pull-up resistor of normal signal state;
Be used to identify the distribution terminal of transmission cable type and resistance value;
Be used for id signal line to impedance matching interface circuit output transmission cable type and resistance value id signal.
Impedance matching interface circuit in the above-mentioned interface comprises:
Be used to store the memory of the impedance of impedance of local device and transmission cable, the coupling mapping table between the type;
Be used to read the type and the resistance value thereof of transmission cable, and from mapping table, find out impedance of local device value corresponding, according to the processor of this resistance value output control signal with it;
Be used for the local terminal design impedance being carried out the impedance for matching configuration circuit according to the control signal of processor output.This impedance configuration circuit comprises: two resistance that are used to adjust the local terminal design impedance; Be used to control above-mentioned resistance disconnection or two closed gate-controlled switches; Be used to make the transformer of local terminal design impedance and the isolation of transmission cable impedance phase.
Memory in the above-mentioned interface is a nonvolatile memory.
The realization impedance that the present invention proposes is the method for coupling automatically, comprises following each step:
1, sets up coupling mapping table between local terminal equipment and the transmission cable information;
2, read the impedance identification information of transmission cable;
3, retrieve above-mentioned mapping table, search the impedance of local device value that is complementary with above-mentioned transmission cable impedance identification information;
4, the impedance matching circuit by joining with local terminal equipment makes the impedance phase coupling of impedance of local device and transmission cable.
Coupling mapping table in the said method comprises the impedance and the mapping of the coupling between the type of impedance of local device and transmission cable.
Impedance matching circuit in the said method is the disconnection or the closure of one group of resistance.
The realization impedance that the present invention proposes is the interface and the method thereof of coupling automatically, can discern the impedance and the type of the transmission cable identical automatically with the resistance value of opposite equip., impedance according to transmission cable, the externally various different impedances of output of interface are so that the impedance phase of impedance of local device and opposite equip. coupling.Automatically the scope of matched impedance interface comprises 75 Ω E1 cables, 120 Ω E1 cables, 100 Ω T1 cables, J1 cable or the like.Impedance matching interface circuit among the present invention is supported identification and configuration to two kinds or two or more impedance cables.When communication equipment need be supported multiple impedance cable, can discern the impedance of cable automatically, and the impedance of automatic butt mouth is configured, and interface circuit impedance and cable resistance are mated automatically, reduces the unmatched risk of impedance that the manual configuration port Impedance is brought greatly.
Description of drawings
Fig. 1 is the structured flowchart of the automatic matched interfaces of impedance.
Fig. 2 is the circuit diagram of the automatic matched interfaces of impedance.
Fig. 3 is the circuit diagram of cable resistance and type identification signal wiring circuit (9) in the connector.
Fig. 4 is an impedance automatic matching method flow chart.
Among Fig. 1～Fig. 4, the 1st, communication equipment, the 2nd, impedance matching interface circuit, the 3rd, the transmission cable connector that transmission cable is connected with local terminal equipment, inside has cable resistance and type of cable id signal, the 4th, transmission cable, the 5th, the connector that transmission cable is connected with the opposite end communication equipment, the 6th, opposite end communication equipment, the 7th, impedance configuration circuit, the 8th, the cable internal transmission line, the 9th, wiring circuit is used to provide the id signal of cable resistance and type of cable.
Embodiment
The realization impedance that the present invention proposes is the interface of coupling automatically, and its structured flowchart comprises as shown in Figure 1: be used to transmission cable 4 that opposite equip. 6 is connected with connector 3, the resistance value that this cable has and opposite equip. 6 impedance phases are same; Be used to connector 3 that transmission cable 4 is connected with local terminal equipment 1, and be used for according to the transmission cable type of connector output and the id signal of resistance value, the impedance matching interface circuit 2 that local terminal equipment is carried out impedance matching.
Connector cable impedance in the above-mentioned interface and type identification signal wiring circuit as shown in Figure 3, comprising: be used to make the id signal line to be in the pull-up resistor of normal signal state; Be used to identify the distribution terminal of transmission cable type and resistance value; Be used for id signal line to impedance matching interface circuit output transmission cable type and resistance value id signal.
Impedance matching interface circuit in the above-mentioned interface as shown in Figure 2, comprising: the memory that is used to store the impedance of impedance of local device and transmission cable, the coupling mapping table between the type; Be used to read the type and the resistance value thereof of transmission cable, and from mapping table, find out impedance of local device value corresponding, according to the processor of this resistance value output control signal with it; Be used for the local terminal design impedance being carried out the impedance for matching configuration circuit according to the control signal of processor output.Impedance configuration circuit wherein comprises: two resistance that are used to adjust the local terminal design impedance; Be used to control above-mentioned resistance disconnection or two closed gate-controlled switches; Be used to make the transformer of local terminal design impedance and the isolation of transmission cable impedance phase.Automatically the matched impedance interface circuit can be discerned the impedance and the type of transmission cable automatically, externally exports multiple impedance, to keep local terminal interface impedance and transmission cable impedance matching.Automatically matched impedance interface circuit is supported identification and configuration to two kinds or two or more transmission cables.Among Fig. 2, recognition interface is actually an input interface, and processor reads the state of id signal by input interface, according to id signal, searches the configuration signal that export in nonvolatile memory.Configuration signal is exported by control interface, control group configuration circuit, the impedance of output appointment.
Impedance configuration circuit wherein or comprise: the integrated circuit that is used to control the local terminal design impedance; Be used to make the transformer of local terminal design impedance and the isolation of opposite equip. transmission cable impedance phase.
Memory in the above-mentioned interface is a nonvolatile memory.
The realization impedance that the present invention proposes is the method for coupling automatically, and its FB(flow block) is at first set up the impedance of an impedance of local device and transmission cable, the coupling mapping table between the type as shown in Figure 4; Read the type and the resistance value thereof of transmission cable; Retrieve above-mentioned mapping table, search the impedance of local device value that type and resistance value thereof with above-mentioned transmission cable are complementary; The disconnection or the closure of one group of resistance that control and local terminal equipment join are mated the impedance phase of impedance of local device and transmission cable; The type of the above-mentioned opposite equip. transmission cable that reads is reported the application layer of local terminal equipment.
Among the present invention, with the various cable Unified coding that automatic matched impedance interface is supported, each impedance cable has unique coding.Among Fig. 3, the identification signal shorted to earth, then expression " 0 ", the id signal open circuit, signal level is " 1 ".Like this, just formed a group coding.Corresponding to the nonvolatile memory in the interface circuit, what store the type of cable of all id signal correspondences and impedance is mapping table, in order to searching.Automatically the matched impedance cable includes but not limited to 75 Ω E1 cables, 120 Ω E1 cables, 100 Ω T1 cables, J1 cable, sees Table 1.In table, four cable resistances and type identification signal are provided.
The implication of table 1 cable resistance and type identification signal indication
| Sequence number | Working method | ??TYPE3 | ??TYPE2 | ??TYPE1 | ??TYPE0 |
| ??1 | Test pattern | ????0 | ????X | ????X | ????X |
| ??2 | 120 Ω E1 cables | ????1 | ????0 | ????0 | ????0 |
| ??3 | 75 Ω E1 cables | ????1 | ????0 | ????0 | ????1 |
| ??4 | Keep | ????1 | ????0 | ????1 | ????0 |
| ??5 | Keep | ????1 | ????0 | ????1 | ????1 |
| ??6 | 100 Ω T1 cables | ????1 | ????1 | ????0 | ????0 |
| ??7 | The J1 cable | ????1 | ????1 | ????0 | ????1 |
| ??8 | Keep | ????1 | ????1 | ????1 | ????0 |
| ??9 | No cable | ????1 | ????1 | ????1 | ????1 |
Impedance configuration circuit can realize blocked impedance to 75 Ω impedances or blocked impedance to 120 Ω impedances or blocked impedance to the conversion of two kinds of 100 Ω impedances etc. or two or more situations.As shown in Figure 2, transformer isolation is passed through in interface impedance configuration circuit front end and rear end, the final circuit that constitutes by terminal resistance and control switch be connected respectively E1 transmission line or T1 transmission line two differential pairs, the break-make of configuration signal control analog switch realizes the conversion of impedance.The integrated circuit that also can select for use analog switch and terminal resistance to integrate in this circuit practical application is realized.
The configuration of table 2 interface impedance dispensing unit terminal resistance
| Terminal resistance | K1=0 (disconnection) | K1=1 (closure) |
| K2=0 (disconnection) | ????120Ω | ????100Ω |
| K2=1 (closure) | ????75Ω |
Claims (11)
1, a kind of impedance interface of coupling automatically of realizing is characterized in that this interface comprises:
Be used to transmission cable that local terminal equipment is connected with opposite equip.;
Be used to transmission cable connector that transmission cable is connected with local terminal equipment;
Be used for the identification information according to the output of transmission cable connector, to the impedance matching interface circuit that local terminal equipment carries out impedance matching, it links to each other with the transmission cable connector.
2, interface as claimed in claim 1 is characterized in that wherein said identification information comprises transmission cable type and resistance value information.
3, interface as claimed in claim 1 is characterized in that the resistance value of wherein said transmission cable is identical with the resistance value of opposite equip..
4, interface as claimed in claim 1 is characterized in that wherein said transmission cable connector comprises:
Be used to make the id signal line to be in the pull-up resistor of normal signal state;
Be used to identify the distribution terminal of transmission cable type and resistance value;
Be used for id signal line to impedance matching interface circuit output transmission cable type and resistance value id signal.
5, interface as claimed in claim 1 is characterized in that wherein said impedance matching interface circuit comprises:
Be used to store the memory of the impedance of impedance of local device and transmission cable, the coupling mapping table between the type;
Be used to read the type and the resistance value thereof of transmission cable, and from mapping table, find out impedance of local device value corresponding, according to the processor of this resistance value output control signal with it;
Be used for the local terminal design impedance being carried out the impedance for matching configuration circuit according to the control signal of processor output.
6, interface as claimed in claim 5 is characterized in that wherein said impedance configuration circuit comprises:
Be used to adjust two resistance of local terminal design impedance;
Be used to control above-mentioned resistance disconnection or two closed gate-controlled switches;
Be used to make the transformer of local terminal design impedance and the isolation of transmission cable impedance phase.
7, interface as claimed in claim 5 is characterized in that wherein said impedance configuration circuit comprises:
Be used to control the integrated circuit of local terminal design impedance;
Be used to make the transformer of local terminal design impedance and the isolation of transmission cable impedance phase.
8, interface as claimed in claim 2 is characterized in that wherein said memory is a nonvolatile memory.
9, a kind of impedance method of coupling automatically that realizes is characterized in that this method comprises following each step:
(1) sets up coupling mapping table between local terminal equipment and the transmission cable information;
(2) read the impedance identification information of transmission cable;
(3) retrieve above-mentioned mapping table, search the impedance of local device value that is complementary with above-mentioned transmission cable impedance identification information;
(4) impedance matching circuit by joining with local terminal equipment makes the impedance phase coupling of impedance of local device and transmission cable.
10, method as claimed in claim 9 is characterized in that at the coupling mapping table described in the step (1), comprises the impedance and the mapping of the coupling between the type of impedance of local device and transmission cable.
11, method as claimed in claim 9 is characterized in that wherein said impedance matching circuit is the disconnection or the closure of one group of resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02154499 CN1235347C (en) | 2002-12-19 | 2002-12-19 | Inter face for realizing automatic impedance matching and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02154499 CN1235347C (en) | 2002-12-19 | 2002-12-19 | Inter face for realizing automatic impedance matching and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508983A true CN1508983A (en) | 2004-06-30 |
| CN1235347C CN1235347C (en) | 2006-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02154499 Expired - Fee Related CN1235347C (en) | 2002-12-19 | 2002-12-19 | Inter face for realizing automatic impedance matching and method thereof |
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| Country | Link |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100495053C (en) * | 2006-11-24 | 2009-06-03 | 华为技术有限公司 | Method, apparatus and system for identifying type of cables and cable transfer apparatus |
| WO2009074074A1 (en) * | 2007-11-28 | 2009-06-18 | Huawei Technologies Co., Ltd. | Cable connector for connecting cable with card and the card |
| CN101752834A (en) * | 2009-12-28 | 2010-06-23 | 中国航空工业集团公司第六三一研究所 | UUT power supply management method and ID identification circuit thereof |
| CN101192072B (en) * | 2006-11-30 | 2010-10-13 | 国际商业机器公司 | Cable, method and system for identifying a cable with a connection location |
| US8026981B2 (en) | 2006-01-03 | 2011-09-27 | Mstar Semiconductor, Inc. | Method of intelligently selecting a signal source and associated apparatus |
| CN101695094B (en) * | 2009-09-30 | 2012-03-28 | 杭州华三通信技术有限公司 | Method and equipment for realizing automatic matching interface impedance on devices |
| CN101605035B (en) * | 2008-06-13 | 2012-05-23 | 鸿富锦精密工业（深圳）有限公司 | Modem and impedance setting method thereof |
| CN101345553B (en) * | 2006-12-19 | 2013-04-24 | 美国博通公司 | Cable diagnosis system, method and system for configuring Ethernet port |
| WO2014000695A1 (en) * | 2012-06-27 | 2014-01-03 | 华为技术有限公司 | E1 cable connector, cable type detection circuit board and method |
| CN107332748A (en) * | 2017-06-26 | 2017-11-07 | 北京机械设备研究所 | The communicator and method of a kind of communication characteristic dynamic state of parameters matching |
| CN107861007A (en) * | 2017-12-19 | 2018-03-30 | 北京品驰医疗设备有限公司 | A kind of method, apparatus and system for identifying different test cables |
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2002
- 2002-12-19 CN CN 02154499 patent/CN1235347C/en not_active Expired - Fee Related
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| CN1997135B (en) * | 2006-01-03 | 2013-07-03 | 晨星半导体股份有限公司 | Method and display of intelligently selecting a signal source |
| US8026981B2 (en) | 2006-01-03 | 2011-09-27 | Mstar Semiconductor, Inc. | Method of intelligently selecting a signal source and associated apparatus |
| US8054384B2 (en) | 2006-01-03 | 2011-11-08 | Mstar Semiconductor, Inc. | Method of auto-configuring audio-video signals and associated apparatus |
| CN100495053C (en) * | 2006-11-24 | 2009-06-03 | 华为技术有限公司 | Method, apparatus and system for identifying type of cables and cable transfer apparatus |
| CN101192072B (en) * | 2006-11-30 | 2010-10-13 | 国际商业机器公司 | Cable, method and system for identifying a cable with a connection location |
| CN101345553B (en) * | 2006-12-19 | 2013-04-24 | 美国博通公司 | Cable diagnosis system, method and system for configuring Ethernet port |
| WO2009074074A1 (en) * | 2007-11-28 | 2009-06-18 | Huawei Technologies Co., Ltd. | Cable connector for connecting cable with card and the card |
| CN101605035B (en) * | 2008-06-13 | 2012-05-23 | 鸿富锦精密工业（深圳）有限公司 | Modem and impedance setting method thereof |
| CN101695094B (en) * | 2009-09-30 | 2012-03-28 | 杭州华三通信技术有限公司 | Method and equipment for realizing automatic matching interface impedance on devices |
| CN101752834B (en) * | 2009-12-28 | 2013-06-19 | 中国航空工业集团公司第六三一研究所 | UUT power supply management method and ID identification circuit thereof |
| CN101752834A (en) * | 2009-12-28 | 2010-06-23 | 中国航空工业集团公司第六三一研究所 | UUT power supply management method and ID identification circuit thereof |
| WO2014000695A1 (en) * | 2012-06-27 | 2014-01-03 | 华为技术有限公司 | E1 cable connector, cable type detection circuit board and method |
| CN107332748A (en) * | 2017-06-26 | 2017-11-07 | 北京机械设备研究所 | The communicator and method of a kind of communication characteristic dynamic state of parameters matching |
| CN107332748B (en) * | 2017-06-26 | 2020-03-17 | 北京机械设备研究所 | Communication device and method for dynamically matching communication characteristic parameters |
| CN107861007A (en) * | 2017-12-19 | 2018-03-30 | 北京品驰医疗设备有限公司 | A kind of method, apparatus and system for identifying different test cables |
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| CN1235347C (en) | 2006-01-04 |
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