CN103825771A - Detection method and quasi-synchronization digital hierarchy apparatus - Google Patents
Detection method and quasi-synchronization digital hierarchy apparatus Download PDFInfo
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- CN103825771A CN103825771A CN201210462101.1A CN201210462101A CN103825771A CN 103825771 A CN103825771 A CN 103825771A CN 201210462101 A CN201210462101 A CN 201210462101A CN 103825771 A CN103825771 A CN 103825771A
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Abstract
The embodiments of the invention relate to a detection method and a quasi-synchronization digital hierarchy apparatus. The method comprises: when there is communication abnormity between a first device and a second device, detecting whether the earth potential of the first device is consistent with the earth potential of the second device, the second device being connected with the first device through a coaxial cable; and if the earth potential of the first device is not consistent with the earth potential of the second device, controlling the first device to be not grounded so as to realize automatic control of coaxial cable grounding, and controlling the surface layer of the coaxial cable to be connected with only one earth phase of one device when the earth potential of the first device is not consistent with the earth potential of the second device so that no currents flow through the surface layer of the coaxial cable, and no currents flow through a transformer in the apparatus, thus magnetic saturation does not occur in the transformer, and accordingly the problem of packet loss or link break does not occur in the apparatus.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of detection method and PDH (Pseudo-synchronous Digital Hierarchy) equipment.
Background technology
Along with the development of the communication technology, PDH (Pseudo-synchronous Digital Hierarchy) (English: Pseudo-synchronous Digital Hierarchy, abbreviation: PDH) interface is as a kind of interface of maturation, comparatively extensive in the application of Communications Market.Wherein, PDH unbalanced mode adopts coaxial cable to carry out signal transmission, and line impedance is 75 ohm.Because coaxial cable top layer is vulnerable to disturb, if coaxial cable top layer is earth-free, interference signal does not have bleed off approach, and causes communication abnormality.Therefore, in order to improve antijamming capability, need to be by coaxial cable top layer ground connection.
Normally, by the mode of coaxial cable top layer ground connection be: by coaxial cable top layer dead earth.Such as: two PDH equipment that connect by coaxial cable.In order to improve antijamming capability, respectively at the printed circuit board of the said equipment (English: Printed Circuit Board, abbreviation: PCB) upper by the cabling ground connection being connected with coaxial cable top layer.
But, in the time that the electromotive force on the ground of the PDH at coaxial cable two ends equipment is different, can form electrical potential difference, make the transformer in PDH equipment have electric current to flow through, thereby make this transformer more easily produce magnetic saturation, finally cause even its link disconnection of PDH equipment packet loss.
Summary of the invention
The invention provides a kind of detection method and PDH (Pseudo-synchronous Digital Hierarchy) PDH equipment, to solve in prior art the PDH equipment packet loss problem that even its link disconnects causing when the electromotive force difference on the ground of the PDH equipment at coaxial cable two ends.
In first aspect, the invention provides a kind of detection method, described method comprises: when communicating by letter between the first equipment and the second equipment occurs when abnormal, detect the earth potential of described the first equipment and whether the earth potential of described the second equipment is consistent, wherein, described the second equipment is connected with described the first equipment by coaxial cable; If the earth potential of the earth potential of described the first equipment and the first equipment is inconsistent, control described the first equipment earth-free.
In conjunction with first aspect, in the possible implementation of the first, extremely comprising appears in communicating by letter between described the first equipment and the second equipment: occur event alarm or fault warning; Described event alarm comprises at least one in dropout LOS, alarm indication signal AIS, OOF LFA, remote alarm indication RAI; Described fault warning comprises at least one in cyclic redundancy check (CRC) mistake, frame alignment signal BER excess and slip.
In conjunction with the possible implementation of the first of first aspect or first aspect, in the possible implementation of the second, the earth potential of described detection local device is with whether the earth potential of opposite equip. is consistent specifically comprises: after being connected of the top layer of described coaxial cable and ground disconnected, detect the electrical potential difference between top layer and the ground of described coaxial cable; In the time that the described potential difference values detecting is zero, the earth potential of described the first equipment is consistent with the earth potential of the second equipment; In the time that the described potential difference values detecting is non-vanishing, the earth potential of the earth potential of described the first equipment and the second equipment is inconsistent.
In conjunction with the possible implementation of the first of first aspect or first aspect, in the third possible implementation, described being connected of the top layer of described coaxial cable and ground disconnected after, also comprise after detecting the electrical potential difference between top layer and the ground of described coaxial cable; Be the first potential difference values by the described potential difference values detecting, and described the first potential difference values is carried out to analog-to-digital conversion, the potential difference values after described analog-to-digital conversion is the second potential difference values; In the time that described the second potential difference values is zero, the earth potential of described the first equipment is consistent with the earth potential of the second equipment; When described the second potential difference values is when non-vanishing, the earth potential of the earth potential of described the first equipment and the second equipment is inconsistent.
In conjunction with the third possible implementation of first aspect or the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation, if the earth potential of the earth potential of described the first equipment and the second equipment is inconsistent, control that described the first equipment is earth-free specifically to be comprised: when the earth potential of described the first equipment and the earth potential of the second equipment are when consistent, control described coaxial cable top layer closed with being connected again of ground; When the earth potential of described the first equipment and the earth potential of the second equipment are when inconsistent, control between described coaxial cable top layer and ground and remain open state.
In second aspect, the invention provides a kind of PDH (Pseudo-synchronous Digital Hierarchy) PDH equipment, described PDH equipment communicates by coaxial cable and opposite equip., it is characterized in that, described PDH equipment comprises: processor, control structure, PDH interface to be measured, testing circuit; Described processor is connected with described PDH interface to be measured; Described processor is connected with described control structure; Described processor is connected with described testing circuit; Described PDH interface to be measured is connected with described coaxial cable; Described control structure is connected with the top layer of described coaxial cable or described control structure is connected with described coaxial cable top layer by described PDH interface to be measured; Described control structure is connected with described testing circuit; Described control structure is connected with ground; Described processor receives the communication data between described PDH equipment and opposite equip. by described PDH interface to be measured, and detect communicating by letter between described PDH equipment and opposite equip. according to described communication data and whether occur extremely, and occur when abnormal when detecting communicating by letter between described PDH equipment and opposite equip., send and detect instruction to described control structure; Described control structure receives after described detection instruction, controls between described coaxial cable top layer and ground and disconnects, and utilizes described testing circuit to detect the earth potential of described PDH equipment and whether the earth potential of described opposite equip. is consistent; If described in the earth potential of described PDH equipment and the earth potential of described opposite equip. that detect inconsistent, control described PDH equipment earth-free.
In conjunction with second aspect, in the possible implementation of the first, extremely comprising appears in communicating by letter between described PDH equipment and opposite equip.: occur event alarm or fault warning; Described event alarm comprises at least one in dropout LOS, alarm indication signal AIS, OOF LFA, remote alarm indication RAI; Described fault warning comprises at least one in cyclic redundancy check (CRC) mistake, frame alignment signal BER excess and slip.
In conjunction with the possible implementation of the first of first aspect or first aspect, in the possible implementation of the second, described control structure comprises switching mode device T; The first end of described switching mode device T is connected with the top layer of described coaxial cable, or is connected with described coaxial cable top layer by stating PDH interface to be measured; The first end ground connection of described switching mode device T; The 3rd end of described switching mode device T with shown in processor be connected, or the 3rd end of described switching mode device T with shown in processor, described testing circuit be all connected; Described switching mode device T first end and switching mode device T the second end with shown in testing circuit be all connected; When described control structure receives after the detection instruction of described processor transmission, control described switching mode device T and disconnect, and the described testing circuit that described switching mode device T is connected in parallel detects the electrical potential difference between described coaxial cable top layer and ground; When described testing circuit detects after the electrical potential difference between described coaxial cable top layer and ground, described testing circuit judges the value of described electrical potential difference, when the value of described electrical potential difference is zero, and control switch type device T closure; If the value of described electrical potential difference is non-vanishing, control switch type device T remains open state; Or described testing circuit carries out the value of described electrical potential difference to be transferred to described processor after analog-to-digital conversion, described processor judges described analog-to-digital electrical potential difference, when described analog-to-digital electrical potential difference is zero, described processor is indicated switching mode device T closure described in described control structure control; If the value of described analog-to-digital electrical potential difference is non-vanishing, described processor indicates switching mode device T described in described controlling organization control to remain open state; Non-vanishing or the described analog-to-digital electrical potential difference of described electrical potential difference is non-vanishing is all the earth potential of described PDH equipment and the earth potential of described opposite equip. is inconsistent.
In conjunction with the possible implementation of the first of first aspect or first aspect, in the third possible implementation, described control structure comprises the first switching mode device T1, second switch type device T2 and resistance R; The first end of described the first switching mode device T1 is connected with described top layer or is connected with the top layer of described coaxial cable by stating PDH interface to be measured; The second end of described the first switching mode device T1 is connected in series with one end of resistance R, the other end ground connection of resistance R; The 3rd end of described the first switching mode device T1 is connected with described processor, or the 3rd end of described the first switching mode device T1 with shown in processor, described testing circuit be all connected; The first end of described second switch type device T2 is connected with described coaxial cable top layer or is connected with the top layer of described coaxial cable by stating PDH interface to be measured; The second end ground connection of described second switch type device T2; The 3rd end of described second switch type device T2 is connected with described processor, or the 3rd end of described second switch type device T2 is all connected with described processor, described testing circuit; Described resistance and described testing circuit are connected in parallel; When described control structure receives after the detection instruction that described processor sends, control described the first switching mode device T1 closure, second switch type device T2 disconnects, and the described testing circuit being connected in parallel with described resistance R detects the electrical potential difference at described resistance R two ends; When described testing circuit detects after the electrical potential difference at described resistance R two ends, described testing circuit judges described electrical potential difference, when the value of described electrical potential difference is zero, controls described the first switching mode device T1 and disconnects, second switch type device T2 closure; If described electrical potential difference is non-vanishing, control described the first switching mode device T1 and disconnect, second switch type device T2 disconnects, and makes to remain open state between described coaxial cable top layer and ground; Or described testing circuit carries out the value of described resistance R two ends electrical potential difference to be transferred to described processor after analog-to-digital conversion, described processor judges the value of described analog-to-digital electrical potential difference, when described analog-to-digital electrical potential difference is zero, described processor indicates the first switching mode device T1 described in described controlling organization control to disconnect, second switch type device T2 closure; Non-vanishing when described analog-to-digital electrical potential difference, described processor indicates the first switching mode device T1 described in described controlling organization control to disconnect, and second switch type device T2 disconnects, and makes to remain open state between described coaxial cable top layer and ground.Non-vanishing or the described analog-to-digital electrical potential difference of described electrical potential difference is non-vanishing is all the earth potential of described PDH equipment and the earth potential of described opposite equip. is inconsistent.
In conjunction with the possible implementation of the second of second aspect, in the 4th kind of possible implementation, described switching mode device T is relay.
In conjunction with the third possible implementation of second aspect, in the 5th kind of possible implementation, described the first switching mode device T1 is relay or bipolar junction-type transistor; Described second switch type device T2 is relay.
By applying detection method disclosed by the invention and PDH (Pseudo-synchronous Digital Hierarchy) PDH equipment, utilize testing circuit automatically to detect the earth potential of this PDH equipment and opposite equip. poor, realize PDH coaxial cable ground connection has been controlled automatically, and at the earth potential of PDH equipment and the earth potential of opposite equip. when inconsistent, controlling coaxial cable top layer is only connected with the ground of an equipment, making does not have electric current to pass through on coaxial cable top layer, the transformer in PDH equipment does not have electric current to flow through yet, transformer there will not be magnetic saturation like this, and then PDH equipment also there will not be the problem of packet loss or link disconnection.
Accompanying drawing explanation
The flow chart of the detection method that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the PDH equipment that Fig. 2 provides for the embodiment of the present invention two;
The structural representation of the PDH equipment that Fig. 3 provides for the embodiment of the present invention three;
The structural representation of the PDH equipment that Fig. 4 provides for the embodiment of the present invention four.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The invention discloses a kind of detection method and PDH (Pseudo-synchronous Digital Hierarchy) PDH equipment, in the time that communication abnormality appears in the interface of PDH equipment, automatically detect the earth potential of PDH equipment and whether the earth potential of opposite equip. is consistent; If the earth potential of PDH equipment is consistent with the earth potential of described opposite equip., automatically control PDH equipment ground; If the earth potential of PDH equipment and the earth potential of opposite equip. are inconsistent, automatically control PDH equipment earth-free, and alarm, thereby realized, PDH coaxial cable ground connection is controlled automatically, and at the earth potential of PDH equipment and the earth potential of opposite equip. when inconsistent, controlling coaxial cable top layer is only connected with the ground of an equipment, making does not have electric current to pass through on coaxial cable top layer, the transformer in PDH equipment does not have electric current to flow through yet, transformer there will not be magnetic saturation like this, and then PDH equipment also there will not be the problem of packet loss or link disconnection.
The flow chart of the detection method that Fig. 1 provides for the embodiment of the present invention one.The method is applied in the first equipment and the second equipment being connected by coaxial cable.As shown in the figure, the present embodiment specifically comprises the following steps:
Step 110, when the communication between the first equipment and the second equipment occurs when abnormal, detects the earth potential of the first equipment and whether the earth potential of the second equipment is consistent automatically.Wherein, the second equipment connects by coaxial cable and the first equipment; The first equipment and the second equipment all have PDH interface.
Alternatively, this step 110 specifically comprises: when communicating by letter between the first equipment and the second equipment occurs when abnormal, the top layer of the coaxial cable that PDH interface to be measured is connected is with after being connected of ground disconnects, and detects the electrical potential difference between top layer and the ground of coaxial cable to be measured.In the time that the potential difference values detecting is zero, judge that the earth potential of the first equipment is consistent with the earth potential of the second equipment; In the time that the potential difference values detecting is non-vanishing, judge that the earth potential of the first equipment and the earth potential of the second equipment are inconsistent.
Further, particularly, when detecting communicating by letter between the first equipment and the second equipment, the processor of the first equipment occurs when abnormal, processor is controlled disconnections that be connected on the top layer for the treatment of coaxial cable and ground, and utilizes the electrical potential difference between top layer and the ground of testing circuit detection coaxial cable of the first equipment.In the time that the potential difference values detecting is zero, judge that the earth potential of the first equipment is consistent with the earth potential of the second equipment; In the time that the potential difference values detecting is non-vanishing, judge that the earth potential of the first equipment and the earth potential of the second equipment are inconsistent.
Above-mentioned optional concrete steps can replace with following concrete steps, this step 110 specifically comprises: when communicating by letter between the first equipment and the second equipment occurs when abnormal, the electrical potential difference between top layer and the ground of coaxial cable to be measured, with after being connected of ground disconnects, is detected in the top layer of the coaxial cable that PDH interface to be measured is connected.Be the first potential difference values by the potential difference values detecting, and the first potential difference values is carried out to analog-to-digital conversion, the potential difference values after analog-to-digital conversion is the second potential difference values.In addition, can also preserve this second potential difference values.In the time that the second potential difference values is zero, judge that the earth potential of the first equipment is consistent with the earth potential of the second equipment; When the second potential difference values is when non-vanishing, judge that the earth potential of described the first equipment and the earth potential of the second equipment are inconsistent.
Further, particularly, the testing circuit of the first equipment detects the electrical potential difference between PDH interface to be measured and ground, and the numerical value of this electrical potential difference is defined as to the first potential difference values, and this first potential difference values is carried out to analog-to-digital conversion.In addition, can also comprise other a series of processing before analog-to-digital conversion, this processing comprises that overvoltage protection, dividing potential drop sample, take absolute value etc., and wherein, overvoltage protection and dividing potential drop sampling are the problems in order to prevent that the first potential difference values is excessive.Then the electrical potential difference after analog-to-digital conversion is defined as to the second potential difference values and is transferred to the processor of the first equipment, processor receives after this second potential difference values, disconnects or closure according to the connection status between top layer and the ground of this second potential difference values decision coaxial cable.When processor receives after this second potential difference values, in the time that the second potential difference values is zero, processor judges that the earth potential of the first equipment is consistent with the earth potential of the second equipment; When the second potential difference values is when non-vanishing, processor judge the earth potential of the first equipment and the earth potential of the second equipment inconsistent.
Step 120, if the earth potential of the earth potential of the first equipment and the second equipment is inconsistent, first equipment of automatically controlling is earth-free.
Adopt in step 110, in the top layer of coaxial cable and being connected the poor concrete steps of the rear sense potential of disconnection of ground, step 120 specifically comprises: when the earth potential of the first equipment and the earth potential of the second equipment are when consistent, the top layer of controlling coaxial cable is closed with being connected again of ground; When the earth potential of the first equipment and the earth potential of the second equipment are when inconsistent, control the state of remaining open that is connected on top layer with the ground of coaxial cable.
Further, particularly, when testing circuit is judged the earth potential of the first equipment and the earth potential of the second equipment when consistent, it is closed with being connected again of ground that testing circuit is directly controlled the top layer of coaxial cable; Judge the earth potential of the first equipment and the earth potential of the second equipment when inconsistent when testing circuit, testing circuit is directly controlled the state of remaining open that is connected on top layer with the ground of coaxial cable.Or, when processor judge the earth potential of the first equipment and the earth potential of the second equipment consistent after, the top layer of processor transmission control coaxial cable and the instruction that is connected again closure on ground, to the control structure of the first equipment, make the closure again that is connected on top layer with the ground of coaxial cable; When processor judge the earth potential of the first equipment and the earth potential of the second equipment inconsistent after, the top layer of processor transmission control coaxial cable and the instruction that is connected the state of remaining open on ground, to the control structure of the first equipment, make the state of remaining open that is connected on top layer with the ground of coaxial cable.
Alternatively, in step, 120 also comprise: when the earth potential of the first equipment and the earth potential of the second equipment are when inconsistent, send warning information.This warning information can be sent automatically by the testing circuit of the first equipment, and its alarm mode has a lot, such as by indicator light display alarm information, or by the buzzer alarm etc. of sounding.This warning information is used for informing between user of service's the first equipment and the second equipment and has electrical potential difference, is conducive to monitoring and the utilization of user of service to communication equipment environment; Also can automatically be sent by the processor of the first equipment, its alarm mode has a lot, such as going out warning information by serially printing, by indicator light display alarm information, or by the buzzer alarm etc. of sounding.In addition, preserve the second potential difference values at the processor of the first equipment, in the above-mentioned warning information going out by serially printing, can also show the second potential difference values.This warning information is used for informing between user of service's the first equipment and the second equipment and has electrical potential difference, or the potential difference values existing between the first equipment and the second equipment, is conducive to monitoring and the utilization of user of service to communication equipment environment.
Step 110 and step 120 have realized in the time occurring that communication abnormality appears in the first equipment and the second equipment, according to the testing result of the electrical potential difference of the first equipment and the second equipment, automatically control whether ground connection of the first equipment; Or, when the processor of the first equipment receives after the testing result of testing circuit, preserve this testing result, and disconnect still closed according to the connection status between top layer and the ground of decision coaxial cable after the simple judgement of testing result; Or, when the testing circuit of the first equipment receives after the detection trigger signal of processor, electrical potential difference between top layer and the ground of detection coaxial cable, and disconnect still closed according to the connection status between top layer and the ground of decision coaxial cable after the simple judgement of testing result.
Whether alternatively, in another embodiment of the present invention, step 110 also comprises: detect communicating by letter between the first equipment and the second equipment and occur abnormal.Wherein, extremely comprising appears in communicating by letter between the first equipment and the second equipment: occur event alarm or fault warning; Described event alarm comprises dropout (English: Loss of signal, LOS), alarm indication signal (English: Alarmindication signal abbreviation:, AIS), OOF (English: Loss of frame alignment, LFA), at least one in remote alarm indication (English: Remote alarm indication, RAI); Described fault warning comprises cyclic redundancy check (CRC) (English: Cyclic Redundancy Check, abbreviation: CRC) at least one in mistake, frame alignment signal BER excess (English: BER of Frame Alignment > 1e-3) and slip (English: slip).
Particularly, the processor timing of the first equipment receives the communication data between the first equipment and the second equipment, and this communication data is processed, in the time that result is event alarm or fault warning, now show that communicating by letter between the first equipment and the second equipment occurs abnormal.
Therefore, whether consistent the detection method that the embodiment of the present invention provides, when communicating by letter between the first equipment and the second equipment occurs when abnormal, detect the earth potential of the first equipment and the earth potential of the second equipment; If the earth potential of the earth potential of described the first equipment and the first equipment is inconsistent, control described the first equipment earth-free, and send alarm signal, realize PDH coaxial cable ground connection has been controlled automatically, and at the earth potential of the first equipment and the earth potential of the second equipment when inconsistent, controlling coaxial cable top layer is only connected with the ground of an equipment, making does not have electric current to pass through on coaxial cable top layer, the transformer in this equipment does not have electric current to flow through yet, transformer there will not be magnetic saturation like this, and then the problem that also there will not be packet loss or link to disconnect in this equipment.
The schematic diagram of the PDH equipment that Fig. 2 provides for the embodiment of the present invention two.This PDH equipment is for carrying out the detection method that the embodiment of the present invention one provides.As shown in the figure, the PDH equipment 11 that the embodiment of the present invention provides is connected with opposite equip. 12 by coaxial cable 13, and this PDH equipment 11 specifically comprises: processor 21, control structure 22, PDH interface 23 to be measured and testing circuit 24.
Whether processor 21 detects communicating by letter between communication data between PDH equipment 11 and the opposite equip. 12 that PDH transmitting-receiving framer receives and opposite equip. 12 and occurs extremely.Occur when abnormal when processor 21 detects communicating by letter between PDH equipment 11 and opposite equip. 12, send and detect instructions to control structure 22.The detection instruction that control structure 22 receiving processors 21 send, disconnects between 14 according to control command control coaxial cable top layer 15 and ground, and controls that testing circuit 24 detects the earth potential of PDH equipment 11 and whether the earth potential of opposite equip. 12 is consistent; If the earth potential of the PDH equipment 11 detecting and the earth potential of opposite equip. 12 are inconsistent, control PDH equipment 11 earth-free, control between coaxial cable top layer 15 and ground 14 and remain open state.
Extremely comprising appears in communicating by letter in the PDH equipment that the embodiment of the present invention provides between PDH equipment and opposite equip.: occur event alarm or fault warning.Wherein, event alarm comprises at least one in dropout LOS, alarm indication signal AIS, OOF LFA, remote alarm indication RAI.Fault warning comprises at least one in cyclic redundancy check (CRC) mistake, frame alignment signal BER excess and slip.
In addition, PDH interface 23 to be measured comprises: PDH framer and line interface device (English: PDH Framer and Line Interface Component).This PDH framer and line interface device are for converting PDH signal to processor 21 manageable signal.
Alternatively, the control structure 22 of the PDH equipment that the embodiment of the present invention provides comprises: switching mode device T, as shown in Figure 3.The first end of switching mode device T is connected with coaxial cable top layer 15.The second end ground connection 14 of switching mode device T.Switching mode device T and testing circuit 24 are connected in parallel, and the first end of switching mode device T and switching mode device the second end are all connected with testing circuit 24.The 3rd end of switching mode device T is connected with processor 21, by disconnection and the closure of processor 21 control switch type device T.Wherein, switching mode device T is preferably relay.Because impedance is little after relay conducting, be conducive to the bleed off of the high-frequency interferencing signal on coaxial cable 13 top layers.
Alternatively, the first end of switching mode device T is connected also with coaxial cable top layer 15 and can is: the first end of switching mode device T is connected with PDH interface 23 to be measured.Because PDH interface 23 to be measured is connected with coaxial cable 13, the first end of switching mode device T also can be connected with coaxial cable top layer 15 by PDH interface 23 to be measured like this.
Alternatively, the 3rd end of switching mode device T also can be connected with testing circuit 24.Testing circuit 24 can control switch type device T disconnection and closure.When control structure 22 receives after the detection instruction that processor 21 sends, control switch type device T disconnects, with the testing circuit 24 that switching mode device T is connected in parallel, this testing circuit 24 is connected in series between coaxial cable top layer 15 and ground 14, and detects the electrical potential difference between coaxial cable top layer 15 and ground 14.In addition, if when the first end of switching mode device T is connected with coaxial cable top layer 15 by PDH interface 23 to be measured, control structure 22 receives after the detection instruction that processor 21 sends, switching mode device T disconnects, the testing circuit 24 being connected in parallel with switching mode device T, this testing circuit 24 is connected in series between PDH interface 23 to be measured and ground 14, and detects the electrical potential difference between coaxial cable top layer 15 and ground 14.
When testing circuit 24 detects after the electrical potential difference between 14 of coaxial cable top layer 15 and ground, testing circuit 24 judges the value of electrical potential difference, when the value of electrical potential difference is zero, and control switch type device T closure; If the value of electrical potential difference is non-vanishing, control switch type device T remains open state.Or testing circuit 14 carries out the value of electrical potential difference to be transferred to processor 11 after analog-to-digital conversion, processor 11 judges the value of the electrical potential difference after analog-to-digital conversion, if analog-to-digital electrical potential difference is zero, processor 11 is indicated control structure 12 control switch type device T closures; If the value of analog-to-digital electrical potential difference is non-vanishing, processor 11 indicates controlling organization 12 control switch type device T to remain open state.
The value value non-vanishing or analog-to-digital electrical potential difference of above-mentioned electrical potential difference is non-vanishing all show the earth potential of PDH equipment 11 and the earth potential of opposite equip. 12 inconsistent.
Alternatively, the control structure 22 of the PDH equipment that the embodiment of the present invention provides comprises: the first switching mode device T1, second switch type device T2 and resistance R, as shown in Figure 4.Wherein, the first switching mode device T1 is relay or bipolar junction-type transistor (English: bipolar junction transistor, abbreviation: BJT); Second switch type device T2 is relay.
The first end of the first switching mode device T1 is connected with coaxial cable top layer 15, or is connected with coaxial cable top layer 15 by PDH interface 13 to be measured.The second end of the first switching mode T1 device is connected with one end of resistance R.The other end ground connection 14 of resistance R; The 3rd end of the first switching mode T1 device is connected with processor 21.The 3rd end of the first switching mode T1 device is connected with detector 24.
The first end of second switch type device T2 is connected with coaxial cable top layer phase 15.The second end ground connection 14 of second switch type device T2.The 3rd end of second switch type T2 device is connected with processor 21.
Resistance R and the first switching mode device T1 are connected in series.Resistance R and testing circuit 24 are connected in parallel, i.e. one end of resistance connection is connected with testing circuit 24, and its other end is also connected with testing circuit 24.
When control structure 22 receives after the detection instruction that processor 21 sends, control structure 23 is controlled the first switching mode device T1 closure, and second switch type device T2 disconnects, and testing circuit 24 detects the electrical potential difference of resistance R.When testing circuit 14 detects after the electrical potential difference of resistance R, testing circuit 14 judges the value of electrical potential difference, when the value of electrical potential difference is zero, controls the first switching mode device T1 and disconnects, second switch type device T2 closure; If the value of electrical potential difference is non-vanishing, control the first switching mode device T1 and disconnect, second switch type device T2 disconnects, and makes to remain open state between coaxial cable top layer 15 and ground;
Or testing circuit 14 carries out the value of electrical potential difference to be transferred to processor 11 after analog-to-digital conversion, processor 11 judges the value of analog-to-digital electrical potential difference, if analog-to-digital electrical potential difference is zero, processor 11 indicates control structure 12 to control the first switching mode device T1 disconnection, second switch type device T2 closure; If analog-to-digital electrical potential difference is non-vanishing, processor 11 indicates control structure 12 to control the first switching mode device T1 disconnection, and second switch type device T2 disconnects, and makes to remain open state between coaxial cable top layer 15 and ground 14.
The value value non-vanishing or analog-to-digital electrical potential difference of above-mentioned electrical potential difference is non-vanishing all show the earth potential of PDH equipment 11 and the earth potential of opposite equip. 12 inconsistent.
Alternatively, also the comprising of the PDH equipment that the embodiment of the present invention provides: alarm device, alarm device, for when the earth potential of equipment of itself and the earth potential of opposite equip. are when inconsistent, sends warning information.Wherein, this alarm device can be located in testing circuit 24, also can be in control structure 22.
Therefore, the PDH equipment that the embodiment of the present invention provides, when detecting communicating by letter between PDH equipment and opposite equip., the processor in this PDH equipment occurs when abnormal, send detection instruction to control structure, control structure receives and detects after instruction, and control testing circuit detects the earth potential of this PDH equipment and whether the earth potential of opposite equip. is consistent, if testing circuit detects the earth potential of this PDH equipment and the earth potential of opposite equip. is inconsistent, this PDH equipment of control structure control is earth-free, thereby realized, coaxial cable ground connection is controlled automatically, and at the earth potential of this PDH equipment and the earth potential of opposite equip. when inconsistent, controlling coaxial cable top layer is only connected with the ground of an equipment, making does not have electric current to pass through on coaxial cable top layer, the transformer in this PDH equipment does not have electric current to flow through yet, transformer there will not be magnetic saturation like this, and then this PDH equipment also there will not be the problem of packet loss or link disconnection.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; all within the scope of technical scheme of the present invention, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a detection method, is characterized in that, described method comprises:
When communicating by letter between the first equipment and the second equipment occurs when abnormal, detect the earth potential of described the first equipment and whether the earth potential of described the second equipment is consistent, wherein, described the second equipment is connected with described the first equipment by coaxial cable;
If the earth potential of the earth potential of described the first equipment and the first equipment is inconsistent, control described the first equipment earth-free.
2. detection method according to claim 1, is characterized in that, extremely comprising appears in communicating by letter between described the first equipment and the second equipment: occur event alarm or fault warning; Described event alarm comprises at least one in dropout LOS, alarm indication signal AIS, OOF LFA, remote alarm indication RAI; Described fault warning comprises at least one in cyclic redundancy check (CRC) mistake, frame alignment signal BER excess and slip.
3. detection method according to claim 1 and 2, is characterized in that, the earth potential of described detection local device specifically comprises with whether the earth potential of opposite equip. is consistent:
After being connected of the top layer of described coaxial cable and ground disconnected, detect the electrical potential difference between top layer and the ground of described coaxial cable;
In the time that the described potential difference values detecting is zero, the earth potential of described the first equipment is consistent with the earth potential of the second equipment; In the time that the described potential difference values detecting is non-vanishing, the earth potential of the earth potential of described the first equipment and the second equipment is inconsistent.
4. detection method according to claim 3, is characterized in that, described being connected of the top layer of described coaxial cable and ground disconnected after, also comprise after detecting the electrical potential difference between top layer and the ground of described coaxial cable;
Be the first potential difference values by the described potential difference values detecting, and described the first potential difference values is carried out to analog-to-digital conversion, the potential difference values after described analog-to-digital conversion is the second potential difference values;
In the time that described the second potential difference values is zero, the earth potential of described the first equipment is consistent with the earth potential of the second equipment; When described the second potential difference values is when non-vanishing, the earth potential of the earth potential of described the first equipment and the second equipment is inconsistent.
5. according to the detection method described in claim 3 or 4, it is characterized in that, if the earth potential of the earth potential of described the first equipment and the second equipment is inconsistent, control that described the first equipment is earth-free specifically to be comprised:
When the earth potential of described the first equipment and the earth potential of the second equipment are when consistent, control described coaxial cable top layer closed with being connected again of ground; When the earth potential of described the first equipment and the earth potential of the second equipment are when inconsistent, control between described coaxial cable top layer and ground and remain open state.
6. a PDH (Pseudo-synchronous Digital Hierarchy) PDH equipment, described PDH equipment communicates by coaxial cable and opposite equip., it is characterized in that, and described PDH equipment comprises: processor, control structure, PDH interface to be measured, testing circuit;
Described processor is connected with described PDH interface to be measured; Described processor is connected with described control structure; Described processor is connected with described testing circuit; Described PDH interface to be measured is connected with described coaxial cable;
Described control structure is connected with the top layer of described coaxial cable or described control structure is connected with described coaxial cable top layer by described PDH interface to be measured; Described control structure is connected with described testing circuit; Described control structure is connected with ground;
Described processor receives the communication data between described PDH equipment and opposite equip. by described PDH interface to be measured, and detect communicating by letter between described PDH equipment and opposite equip. according to described communication data and whether occur extremely, and occur when abnormal when detecting communicating by letter between described PDH equipment and opposite equip., send and detect instruction to described control structure; Described control structure receives after described detection instruction, controls between described coaxial cable top layer and ground and disconnects, and utilizes described testing circuit to detect the earth potential of described PDH equipment and whether the earth potential of described opposite equip. is consistent; If described in the earth potential of described PDH equipment and the earth potential of described opposite equip. that detect inconsistent, control described PDH equipment earth-free.
7. PDH equipment according to claim 6, is characterized in that, extremely comprising appears in communicating by letter between described PDH equipment and opposite equip.: occur event alarm or fault warning; Described event alarm comprises at least one in dropout LOS, alarm indication signal AIS, OOF LFA, remote alarm indication RAI; Described fault warning comprises at least one in cyclic redundancy check (CRC) mistake, frame alignment signal BER excess and slip.
8. according to the PDH equipment described in claim 6 or 7, it is characterized in that, described control structure comprises switching mode device; The first end of described switching mode device is connected with the top layer of described coaxial cable, or is connected with described coaxial cable top layer by described PDH interface to be measured; The second end ground connection of described switching mode device; The 3rd end of described switching mode device is connected with described processor, or the 3rd end of described switching mode device with shown in processor, described testing circuit be all connected; Described switching mode device first end and switching mode device the second end are all connected with described testing circuit;
When described control structure receives after the detection instruction of described processor transmission, control described switching mode device and disconnect, and the described testing circuit that described switching mode device is connected in parallel detects the electrical potential difference between described coaxial cable top layer and ground;
When described testing circuit detects after the electrical potential difference between described coaxial cable top layer and ground, described testing circuit judges the value of described electrical potential difference, when the value of described electrical potential difference is zero, and control switch type device closure; If the value of described electrical potential difference is non-vanishing, control switch type device remains open state;
Or described testing circuit carries out the value of described electrical potential difference to be transferred to described processor after analog-to-digital conversion, described processor judges described analog-to-digital electrical potential difference, when described analog-to-digital electrical potential difference is zero, described processor is indicated switching mode device closure described in described control structure control; If the value of described analog-to-digital electrical potential difference is non-vanishing, described processor indicates switching mode device described in described controlling organization control to remain open state;
Non-vanishing or the described analog-to-digital electrical potential difference of described electrical potential difference is non-vanishing is all the earth potential of described PDH equipment and the earth potential of described opposite equip. is inconsistent.
9. according to the PDH equipment described in claim 6 or 7, it is characterized in that, described control structure comprises the first switching mode device, second switch type device and resistance; The first end of described the first switching mode device is connected with described top layer or is connected with the top layer of described coaxial cable by described PDH interface to be measured; The second end of described the first switching mode device is connected in series with one end of resistance, the other end ground connection of resistance; The 3rd end of described the first switching mode device is connected with described processor, or the 3rd end of described the first switching mode device with shown in processor, described testing circuit be all connected; The first end of described second switch type device is connected with described coaxial cable top layer or is connected with the top layer of described coaxial cable by described PDH interface to be measured; The second end ground connection of described second switch type device; The 3rd end of described second switch type device is connected with described processor, or the 3rd end of described second switch type device is all connected with described processor, described testing circuit; Described resistance and described testing circuit are connected in parallel;
When described control structure receives after the detection instruction that described processor sends, control described the first switching mode device closure, second switch type device disconnects, and the described testing circuit being connected in parallel with described resistance detects the electrical potential difference at described resistance two ends;
When described testing circuit detects after the electrical potential difference at described resistance two ends, described testing circuit judges described electrical potential difference, when the value of described electrical potential difference is zero, controls described the first switching mode device and disconnects, second switch type device closure; If described electrical potential difference is non-vanishing, to control described the first switching mode device and disconnect, second switch type device disconnects, and makes to remain open state between described coaxial cable top layer and ground;
Or described testing circuit carries out the value of described resistance two ends electrical potential difference to be transferred to described processor after analog-to-digital conversion, described processor judges the value of described analog-to-digital electrical potential difference, when described analog-to-digital electrical potential difference is zero, described processor indicates the first switching mode device described in described controlling organization control to disconnect, second switch type device closure; Non-vanishing when described analog-to-digital electrical potential difference, described processor indicates the first switching mode device described in described controlling organization control to disconnect, and second switch type device disconnects, and makes to remain open state between described coaxial cable top layer and ground;
Non-vanishing or the described analog-to-digital electrical potential difference of described electrical potential difference is non-vanishing is all the earth potential of described PDH equipment and the earth potential of described opposite equip. is inconsistent.
10. PDH equipment according to claim 8, is characterized in that, described switching mode device is relay.
11. PDH equipment according to claim 9, is characterized in that, described the first switching mode device is relay or bipolar junction-type transistor; Described second switch type device is relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210462101.1A CN103825771A (en) | 2012-11-16 | 2012-11-16 | Detection method and quasi-synchronization digital hierarchy apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210462101.1A CN103825771A (en) | 2012-11-16 | 2012-11-16 | Detection method and quasi-synchronization digital hierarchy apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114138699A (en) * | 2021-11-01 | 2022-03-04 | 珠海格力电器股份有限公司 | Serial port communication processing method, device, equipment, control system and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518327A (en) * | 2003-01-29 | 2004-08-04 | 华为技术有限公司 | Ground resistant loop interference system |
| CN101552901A (en) * | 2009-04-22 | 2009-10-07 | 潍坊东升电子有限公司 | Cable television signal anti-interference device |
| CN101741476A (en) * | 2009-12-11 | 2010-06-16 | 华为技术有限公司 | Communication equipment, method and system |
-
2012
- 2012-11-16 CN CN201210462101.1A patent/CN103825771A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518327A (en) * | 2003-01-29 | 2004-08-04 | 华为技术有限公司 | Ground resistant loop interference system |
| CN101552901A (en) * | 2009-04-22 | 2009-10-07 | 潍坊东升电子有限公司 | Cable television signal anti-interference device |
| CN101741476A (en) * | 2009-12-11 | 2010-06-16 | 华为技术有限公司 | Communication equipment, method and system |
Non-Patent Citations (1)
| Title |
|---|
| 郭蕾: "浅谈TDCS系统地线干扰对通道的影响", 《哈尔滨铁道科技》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114138699A (en) * | 2021-11-01 | 2022-03-04 | 珠海格力电器股份有限公司 | Serial port communication processing method, device, equipment, control system and storage medium |
| CN114138699B (en) * | 2021-11-01 | 2024-03-26 | 珠海格力电器股份有限公司 | Serial communication processing method, device, equipment, control system and storage medium |
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