CN101162943A - Optical cable monitoring system and method combined with broken wire automatic switching protection - Google Patents
Optical cable monitoring system and method combined with broken wire automatic switching protection Download PDFInfo
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- CN101162943A CN101162943A CNA2006101321363A CN200610132136A CN101162943A CN 101162943 A CN101162943 A CN 101162943A CN A2006101321363 A CNA2006101321363 A CN A2006101321363A CN 200610132136 A CN200610132136 A CN 200610132136A CN 101162943 A CN101162943 A CN 101162943A
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Abstract
A fiber cable monitoring system with an automatic protection mechanism of a wire break includes a primary optical channel, a standby optical channel, a detection device of the fault points of the optical channel, a plurality of automatic protection devices of the wire break and a plurality of terminal devices of optical communication. When the wire of the primary optical channel breaks, the connection of a plurality of terminal devices of optical communication and the primary optical channel is switched to the standby optical channel by the automatic protection devices of the wire break and a test optical channel is chosen for using the detection device of the fault points of the optical channel to locate the fault points of the test optical channel.
Description
Technical field
The present invention is relevant for a kind of optical cable monitoring system and method, particularly about a kind of optical cable monitoring system and method for combined with broken wire automatic switching protection.
Background technology
The fiber optic cable monitor of optical fiber telecommunications system uses usually such as optical time domain reflectometer (opticaltime-domain reflectometry; OTDR) optical channel fault point checkout gear.The comparison of the luminous power that optical time domain reflectometer returns by means of different time points reflects naturally with respect to the test optical fiber signal and the original fiber quality track of precedence record and failure judgement point or break point whereabouts.The monitoring of general optical cable is divided into online (on-line) and two kinds of patterns of off-line (off-line).Line model is meant that the optical fibre core (optical fiber) that optical time domain reflectometer detects itself is the transmission heart yearn, and the test optical fiber signal has different wavelength with transmission signals.Off-line mode then is that the optical fibre core that optical time domain reflectometer detects is non-transmission heart yearn.
Figure 1A shows a traditional optical cable on-line monitoring system 100A, and it comprises optical cable 110, Communication ray terminating machine (120,121), optical time domain reflectometer 130, optical channel switch (opticalswitch; OSW) 140, CPU (central processing unit; CPU) 150, divided duplexing equipment (wavelength division multiplexer; WDM) (160,161), light power meter 170.Figure 1A is by the traditional on-line monitoring mode of a part of illustration of whole fiber optic network, actual fiber optic network may comprise more such as Communication ray terminating machine, optical cable and relative divided duplexing equipment to constitute whole telecommunication network.Communication ray terminating machine 120 and 121 is by divided duplexing equipment 160, optical cable 110 and divided duplexing equipment 161 and other interior Communication ray terminating machine exchange message of fiber optic network.Optical cable 110 can comprise a plurality of as above-mentioned optical fibre core.Optical channel switch 140 can be the switch of one-to-many, when finding that by light power meter 170 normal luminous power disappears, CPU 150 switches light censor keys 140 are to select the optical fibre core in the optical cable 110 and to control the detection that optical time domain reflectometer 130 is done break point.Because be the on-line testing pattern, optical time domain reflectometer 130 carries out the location of break point with the test optical fiber signal of different wave length.
Figure 1B shows a traditional optical cable off-line monitoring 100B of system, and it comprises optical cable 110, optical time domain reflectometer 130, optical channel switch 140, CPU 150, divided duplexing equipment 160, light power meter 170 and light source 180.Similarly, Figure 1B is by the traditional off-line monitoring mode of a part of illustration of whole fiber optic network, actual fiber optic network may comprise more such as Communication ray terminating machine, optical channel and relative divided duplexing equipment to constitute whole telecommunication network.Owing to do not transmit the light signal on the monitoring optical fiber of off-line, so need provide light signal to carry out instant monitoring by extra light source 180.When light power meter 170 can't detect light signal from light source 180, CPU 150 was that switches light censor key 140 is to select the optical fibre core in the optical cable 110 and to control the detection that optical time domain reflectometer 130 is done break point.
Tradition is used the fiber optic cable monitor mode of optical time domain reflectometer, though technically can orient heart yearn broken string place, current mode has its speed limit system.For example, it detects about a minute consuming time of single heart yearn possibility typical optical time domain reflectometer, and the optical cable test that then contains 20 heart yearns finishes and promptly needs 20 minutes.And optical time domain reflectometer detects during the heart yearn, and fault is not got rid of, the maintenance of fault must wait until again localization of fault after can begin, this needs the extra time again.In addition, optical time domain reflectometer itself is comparatively expensive, is recycled and reused for the waste of the detection of normal heart yearn just as resource.
In view of above-mentioned shortcoming, be necessary to propose improved method about the conventional cable monitoring mode.New method preferably can promptly be got rid of or maintenance broken string incident, to keep the integrality of communication system immediately; And preferably can make optical time domain reflectometer be exclusively used in the detection of fault point, avoid unnecessary test to increase the useful life of valuable equipment.
Summary of the invention
One of purpose of the present invention is to propose a kind of optical cable monitoring system with the automatic protection mechanism of broken string, and it can keep the complete of communication immediately when detecting broken string.
Another object of the present invention is to propose a kind of servicing unit of optical cable monitoring system, it has the broken string function of protection automatically, and keeps the complete of communication when optical cable monitoring system detects broken string immediately.
Another purpose of the present invention is to propose a kind of fiber optic cable monitor method with the automatic protection mechanism of broken string.
According to above-mentioned purpose; the present invention proposes a kind of optical cable monitoring system with the automatic protection mechanism of broken string, its comprise main with optical channel, spare optical channel, the optical channel fault point checkout gear that is used for detecting the optical channel fault point, be used to monitor main with a plurality of broken string automatic safety devices of optical channel broken string and be connected to main a plurality of optical communication terminal installations of using optical channel via each broken string automatic safety device respectively.Wherein a plurality of broken string automatic safety devices are when judging the master with optical channel generation broken string incident; with a plurality of optical communication terminal installations with main with being connected of optical channel switching to spare optical channel, and select a test light passage and utilize optical channel fault point checkout gear that this test light passage is done the detection of fault point.
The present invention also proposes a kind of servicing unit that is used for optical cable monitoring system, and it comprises transmission optical channel switching device shifter, receives optical channel switching device shifter and luminous power measuring element.Transmission optical channel switching device shifter connects the light signal transmission terminal and the first main optical channel of using of an optical communication terminal installation in the optical cable monitoring system; Receive the light signal receiving terminal and the second main optical channel of using that the optical channel switching device shifter connects the optical communication terminal installation; The luminous power measuring element is used to monitor second to be led with the luminous power on the optical channel; When wherein the luminous power measuring element can't detect second master with the luminous power on the optical channel, transmission optical channel switching device shifter switches to an optical channel fault point checkout gear with the first main connection with optical channel, and reception optical channel switching device shifter also switches to optical channel fault point checkout gear with the second main connection with optical channel.
The present invention also proposes a kind of fiber optic cable monitor method with the automatic protection mechanism of broken string, and it comprises: the main luminous power with optical channel of monitoring is led with optical channel fault whether to judge; When the master is determined fault with optical channel, communication is switched to spare optical channel, and start a fault point trace routine.
Description of drawings
Figure 1A shows a traditional optical cable on-line monitoring system.
Figure 1B shows a traditional optical cable off-line monitoring system.
Fig. 2 shows the optical cable monitoring system according to one embodiment of the invention.
Fig. 3 A and Fig. 3 B show main element and the outside connection diagram according to automatic optical fiber switch embodiment of the present invention.
Fig. 3 C shows main element and the outside connection diagram according to another automatic optical fiber switch embodiment of the present invention.
Fig. 4 shows the optical cable monitoring system according to another embodiment of the present invention.
Fig. 5 shows the fiber optic cable monitor method according to one embodiment of the invention.
Symbol description among the figure
The step of 50/52 fiber optic cable monitor method
100A/100B conventional cable monitoring system
110 optical cables
120/121 Communication ray terminating machine
130 optical time domain reflectometers
140 optical channel switchs
150 CPU
160/161 divided duplexing equipment
170 light power meters
180 light sources
The 200A/200B optical cable monitoring system
210/212 master uses optical cable with optical channel/master
215 is main with light lane testing optical channel
The 216 main fiber optic cable communications optical channels of using
The 210A first main optical channel of using
The 210B second main optical channel of using
220/222 spare optical channel/reserve cable
225 spare optical channel test light passages
226 reserve cable Communication ray passages
220A first spare optical channel
220B second spare optical channel
230 optical time domain reflectometers
240 optical channel switchs
250 CPU
260-263 automatic optical fiber switch
270-273 Communication ray terminating machine
The link of A1/A2/B1/B2 optical channel switch
Two pairs two optical channel switchs of OSW2X2A
Two pairs two optical channel switchs of OSW2X2B
Two pairs two optical channel switchs of OSW2X2C
Two pairs two optical channel switchs of OSW2X2D
The a pair of two optical channel switchs of OSW1X2A
The a pair of two optical channel switchs of OSW1X2B
The PD0/PD1 light quantity is surveyed element
Rx Communication ray terminating machine receiving terminal
Tx Communication ray terminating machine transmission ends
The link of X/Y1/Y2/Yn optical channel switch
Embodiment
Fig. 2 shows the optical cable monitoring system 200A according to one embodiment of the invention, it comprises main with optical channel 210,212, spare optical channel 220,222, optical time domain reflectometer 230, optical channel switch 240, CPU 250, a plurality of automatic optical fiber switch 260-263 and a plurality of Communication ray terminating machine 270-273.Optical cable monitoring system 200A can comprise and manyly link into overall optical fiber communication networking with module such as optical channel, spare optical channel, Communication ray terminating machine and automatic optical fiber switch or member such as main.CPU 250 connects and control optical time domain reflectometer 230, optical channel switch 240 and automatic optical fiber switch 260; Optical time domain reflectometer 230 is connected to optical channel switch 240; Optical channel switch 240 is connected to automatic optical fiber switch 260; Automatic optical fiber switch 260 is connected to Communication ray terminating machine 270, main with optical channel 210 and spare optical channel 220.The master is connected to automatic optical fiber switch 261 again with optical channel 210 and spare optical channel 220; Automatic optical fiber switch 261 is connected to automatic optical fiber switch 262 and Communication ray terminating machine 271; Automatic optical fiber switch 262 is connected to main with optical channel 212, spare optical channel 222 and Communication ray terminating machine 272; The master is connected to automatic optical fiber switch 263 again with optical channel 212 and spare optical channel 222; Automatic optical fiber switch 263 is connected to Communication ray terminating machine 273.
Main can be the optical fibre core that lays respectively in the two different optical cables with optical channel 210,212 and spare optical channel 220,222, can also be the different fiber heart yearn in the same optical cable.Communication ray terminating machine 270 can be a machine room end optical transceiver module, or is commonly referred to as optical line terminal equipment (Optical Line Terminal; Or abbreviation OLT).Communication ray terminating machine 271-273 can be the client optical transceiver module, or is commonly referred to as optical network unit (Optical Network Unit; Or abbreviation ONU).Optical channel switch 240 can be the optical switch of one-to-many, and automatic optical fiber switch 260 promptly is connected to one of a plurality of links that optical channel switch 240 can switch.Automatic optical fiber switch 260-263 system comprises the module of optical channel handoff functionality and luminous power measuring function; it on its function a kind of broken string automatic safety device; in the present invention,, have the function of optical power monitoring and breaking protection concurrently as the servicing unit of optical cable monitoring system.During normal operation, the optical channel handoff functionality of automatic optical fiber switch 260 can be connected to Communication ray terminating machine 270 with optical channel 210 with main, and spare optical channel 220 is connected to optical channel switch 240, and monitoring simultaneously is main with the luminous power on the optical channel 210.When the master with optical channel 210 broken string or fault took place, the master of automatic optical fiber switch 260 monitorings will disappear or decay pattern of anomaly with optical channel 210 luminous powers.At this moment, automatic optical fiber switch 260 automaticallyes switch and switches to optical channel switch 240 will lead with optical channel 210, simultaneously spare optical channel 220 is switched to Communication ray terminating machine 270, also keeps the integrality of communication immediately with automatic protection.Automatic optical fiber switch 261 also will disappear because of the luminous power of monitoring and the Communication ray terminating machine 271 that connects will be switched to spare optical channel 220.
Above-mentioned is main with comprising a pair of transmission heart yearn respectively on optical channel 210,212 and spare optical channel 220,222 practices, and following examples further specify its details.Fig. 3 A shows main element and the outside connection diagram of automatic optical fiber switch 260 and 261 embodiment, it is essentially and comprises automatic optical fiber switch 260 among Fig. 2,261, Communication ray terminating machine 270,271, optical channel switch 240, main with optical channel 210 and spare optical channel 220 further details partly.Master among Fig. 2 is represented as the first main optical channel 210A of using and the second main optical channel 210B that uses with optical channel 210 in Fig. 3 A; Similarly, spare optical channel 220 also is expressed as the first spare optical channel 220A and the second spare optical channel 220B.First master wherein is used to transmit the light signal to Communication ray terminating machine 271 from Communication ray terminating machine 270 with optical channel 210A and first spare optical channel 220A system, and second master then is used to transmit the light signal to Communication ray terminating machine 270 from Communication ray terminating machine 271 with the optical channel 210B and the second spare optical channel 220B.
Referring to Fig. 3 A, automatic optical fiber switch 260 comprises two couples two optical channel switch OSW2X2A, the two couples of two optical channel switch OSW2X2B and light quantity is surveyed element PD0.Two couples two optical channel switch OSW2X2A and two couples two optical channel switch OSW2X2B all comprise four link A1, A2, B1 and B2, and can switch between first state and two kinds of states of second state.First state makes link A1 be connected to link B1 (and link A2 is connected to link B2), and second state then makes link A1 be connected to link B2 (and link A2 is connected to link B1).For example, two couples, two optical channel switch OSW2X2A and the OSW2X2B of Fig. 3 A all are in first state.Automatic optical fiber switch 261 comprises a pair of two optical channel switch OSW1X2A, a pair of two optical channel switch OSW1X2B and light quantity is surveyed element PD1.A pair of two optical channel switch OSW1X2A and a pair of two optical channel switch OSW1X2B all comprise three link A1, B1 and B2, and also can switch between first state and two kinds of states of second state.Similarly, its first state makes link A1 be connected to link B1, and second state then makes link A1 be connected to link B2.For example, one of Fig. 3 A all is in first state to two optical channel switch OSW1X2A and OSW1X2B.Communication ray terminating machine 270 and 271 all comprises transmission ends Tx and receiving terminal Rx.Optical channel switch 240 comprise link X, Y1, Y2 ...., n+1 link such as Yn, it can switch between n state, each state is connected to link X one of them of link Y1 to Yn respectively.Light quantity survey element PD0 and light quantity survey element PD1 can be the luminous power measuring elements such as optical diode (photodiode).
The annexation of each main element among the embodiment of following key diagram 3A.The transmission ends Tx of Communication ray terminating machine 270 is connected to the A1 link of two couples two optical channel switch OSW2X2A, and its receiving terminal Rx is connected to the A1 link of two couples two optical channel switch OSW2X2B.The B1 link of two couples two optical channel switch OSW2X2A is led the B1 link that is connected to a pair of two optical channel switch OSW1X2A with optical channel 210A via first, and its B2 link is connected to the B2 link of a pair of two optical channel switch OSW1X2A via the first spare optical channel 220A.The A1 link of a pair of two optical channel switch OSW1X2A is connected to the receiving terminal Rx of Communication ray terminating machine 271.The B1 link of two couples two optical channel switch OSW2X2B is led the B1 link that is connected to a pair of two optical channel switch OSW1X2B with optical channel 210B via second, and its B2 link is connected to the B2 link of a pair of two optical channel switch OSW1X2B via the second spare optical channel 220B.The A1 link of a pair of two optical channel switch OSW1X2B is connected to the transmission ends Tx of Communication ray terminating machine 271.Light quantity is surveyed the A1 link that element PD0 is connected to two couples two optical channel switch OSW2X2B, and light quantity is surveyed the A1 link that element PD1 is connected to a pair of two optical channel switch OSW1X2A.The X link of optical channel switch 240 is connected to optical time domain reflectometer 230 (not being shown in Fig. 3 A), its Y1 link is connected to the A2 link of two couples two optical channel switch OSW2X2A, and its Y2 link is connected to the A2 link of two couples two optical channel switch OSW2X2B.Because link Y1, the Y2 of optical channel switch 240 ..., Yn each other on function and indistinction, so basically can from link Y1, the Y2 of optical channel switch 240 ..., choose the A2 link that two links are connected to two couples two optical channel switch OSW2X2A and two couples two optical channel switch OSW2X2B respectively wantonly among the Yn.
As previously mentioned, two couples, the two optical channel switch OSW2X2A of Fig. 3 A and OSW2X2B and a pair of two optical channel switch OSW1X2A and OSW1X2B all are in first state.Change speech, Communication ray terminating machine 270 and 271 s' light signal communication system is main with optical channel 210A and second main with optical channel 210B transmission by first.Particularly, the light signal that Communication ray terminating machine 270 transmission ends Tx spread out of is led the receiving terminal Rx that transfers to Communication ray terminating machine 271 with optical channel 210A by first, and light quantity survey element PD1 monitors this light signal in the A1 link of a pair of two optical channel switch OSW1X2A; The light signal that Communication ray terminating machine 271 transmission ends Tx spread out of is led the receiving terminal Rx that transfers to Communication ray terminating machine 270 with optical channel 210B by second, and light quantity survey element PD0 monitors this light signal in the A1 link of two couples two optical channel switch OSW2X2B.
Meaning is promptly main with the optical channel 210A and/or the second main communication disruption with optical channel 210B by first with optical channel 210 broken string that meets accident when main, and light quantity survey element PD0 and/or light quantity survey element PD1 can't detect normal luminous power.At this moment, the two couples two optical channel switch OSW2X2A and OSW2X2B and a pair of two optical channel switch OSW1X2A and OSW1X2B will successively be switched to second state shown in Fig. 3 B.Change speech, when main with optical channel 210 broken string that meets accident, automatic optical fiber switch 260 will make Communication ray terminating machine 270 communicate by letter with 271 light signal immediately with automatic optical fiber switch 261 and switch to spare optical channel 220 (comprising 220A and 220B), and make the winner switch to optical channel switch 240 with light passage 210 (comprising 210A and 210B) and can detect main with the fault point on the optical channel 210 (comprising 210A and 210B) via optical time domain reflectometer (not being shown in Fig. 3 A and Fig. 3 B).With respect to traditional approach, the present invention reaches broken wire automatic switching protection by this, keeps the integrality of communication immediately; And the fault point test program of optical time domain reflectometer when square payment for initiation in case of necessity avoids unnecessary wear and tear of machinery.In addition, the present invention does not also need the essential divided duplexing equipment of traditional monitoring mode (WDM), is saved departmental cost.
Two of automatic optical fiber switch 261 a pair of two optical channel switchs can also be replaced into two two couples two optical channel switchs (OSW2X2C and OSW2X2D among Fig. 3 A and Fig. 3 B, its state variation is with OSW2X2A and OSW2X2B), to be connected in Communication ray terminating machine and the network other automatic optical fiber switch simultaneously, shown in Fig. 3 C.The structure of utilization shown in Fig. 3 C, the extension that can reach optical channel by the serial connection of automatic optical fiber switch.
According to another embodiment of the present invention, aforesaid two couples two optical channel switch OSW2X2A and/or OSW2X2B can substitute and reach similar function with two a pair of two optical channel switchs.
Fig. 4 shows the optical cable monitoring system 200B according to another embodiment of the present invention, and it comprises main with optical cable 210, reserve cable 220, optical time domain reflectometer 230, optical channel switch 240, CPU 250, a plurality of automatic optical fiber switch (260-263) and a plurality of Communication ray terminating machine (270-273).The master comprises test light passage 215 and Communication ray passage 216 with optical cable 210; Reserve cable 220 comprises test light passage 225 and Communication ray passage 226.CPU 250 connects and control optical time domain reflectometer 230, optical channel switch 240 and automatic optical fiber switch 260; Optical time domain reflectometer 230 is connected to optical channel switch 240; Optical channel switch 240 is connected to main with light cable test optical channel 215 and reserve cable test light passage 225; Automatic optical fiber switch 260 is connected to Communication ray terminating machine 270, main with fiber optic cable communications optical channel 216 and reserve cable Communication ray passage 226.The master is connected to automatic optical fiber switch 261 again with fiber optic cable communications optical channel 216 and reserve cable Communication ray passage 226; Automatic optical fiber switch 261 is connected to Communication ray terminating machine 271; Automatic optical fiber switch 262 is connected to main with fiber optic cable communications optical channel 216, reserve cable Communication ray passage 226 and Communication ray terminating machine 272; The master is connected to automatic optical fiber switch 263 again with fiber optic cable communications optical channel 216 and reserve cable Communication ray passage 226; Automatic optical fiber switch 263 is connected to Communication ray terminating machine 273.Above-mentioned test light passage and Communication ray passage can be the optical fibre cores in the optical cable, and as preceding as described in, the optical channel on the practice comprises a pair of transmission optical fibre core usually.
The running of Fig. 4 and Fig. 2, Fig. 3 A and Fig. 3 category-B seemingly, basically in main during with optical cable 210 broken strings, the optical channel switch in the automatic optical fiber switch (260-263) promptly switches to reserve cable 220, it is complete to keep communication immediately.Then notify CPU 250 to do the disposal of necessity.Main difference is that the optical time domain reflectometer 230 in this example only is linked to main with test light passage 215 in the optical cable 210 and the test light passage 225 in the reserve cable 220 via optical channel switch 240.Changing speech, though the heart yearn of optical time domain reflectometer 230 monitorings and automatic optical fiber switch 260-263 find that the heart yearn of broken string is positioned at same optical cable, is not same heart yearn.Yet,, its usefulness is arranged on practice so plant the monitoring of offline mode because the heart yearn that statistics goes up in the same optical cable of most cases tends to break simultaneously.And less because of the heart yearn number of its monitoring, be to have the advantage on the cost.
Fig. 2 and embodiment shown in Figure 4 are similar to the monitoring pattern of traditional online and off-line respectively.Other embodiments of the invention can comprise online and mixed mode off-line.Meaning is promptly according to actual considering, and the part heart yearn in the same optical cable can be embodied in the line monitoring, and also keeps an off-line monitoring heart yearn to do the monitoring of off-line during the heart yearn of on-line monitoring broken string in this optical cable.
According to the disclosed technology of the foregoing description, the present invention also comprises a kind of fiber optic cable monitor method with the automatic protection mechanism of broken string as can be known.Fig. 5 shows the key step according to the fiber optic cable monitor method of one embodiment of the invention, and it comprises the main luminous power with optical channel of monitoring and leads with optical channel fault (step 50) whether to judge this; When the master is determined fault with optical channel, communication is switched to spare optical channel, and start a fault point trace routine (step 52).The monitoring of luminous power can be used the luminous power measuring element of the class of optical diode.The fault point trace routine can comprise selects a test light passage, and uses and such as the optical channel fault point checkout gear of optical time domain reflectometer this test light passage is done the detection of fault point.Selected test light passage according to considering of systems organization can be such as above-mentioned main with optical channel optical fibre core or be positioned at and lead other optical fibre core of the same optical cable of usefulness optical channel,
Above embodiment only is that possible reality is made example.Many variations or modification all can be reached under the principle that does not break away from this announcement.These variations or modification all should be considered as being protected by appended claim at the interior of this announcement category.
Claims (14)
- One kind have the broken string automatic protection mechanism optical cable monitoring system, comprise:The one main optical channel of using;One spare optical channel;One optical channel fault point checkout gear is used to detect the fault point of optical channel;Plural number broken string automatic safety device is used to monitor the broken string incident of this master with optical channel;Plural number optical communication terminal installation is connected to this master via this plural number broken string automatic safety device respectively and uses optical channel;Wherein should break automatic safety device when judging this master by plural number with optical channel generation broken string incident; this plural number optical communication terminal installation is switched to this spare optical channel with this master with being connected of optical channel, and select a test light passage and utilize this optical channel fault point checkout gear that this test light passage is done the detection of fault point.
- 2. the optical cable monitoring system with the automatic protection mechanism of broken string as claimed in claim 1, wherein this optical channel fault point checkout gear is an optical time domain reflectometer.
- 3. the optical cable monitoring system with the automatic protection mechanism of broken string as claimed in claim 2, wherein the selection of this test light passage is by an optical channel switch.
- 4. the optical cable monitoring system with the automatic protection mechanism of broken string as claimed in claim 2, wherein should plural number the broken string automatic safety device one comprise two pairs two optical channel switchs to carry out the switching between this master usefulness optical channel and this spare optical channel.
- 5. the optical cable monitoring system with the automatic protection mechanism of broken string as claimed in claim 2 wherein should all comprise the broken string incident of luminous power measuring element with the monitoring optical channel by plural number broken string automatic safety device.
- 6. servicing unit that is used for optical cable monitoring system comprises:One transmission optical channel switching device shifter, the light signal transmission terminal and one first master that connect an optical communication terminal installation in this optical cable monitoring system use optical channel;One receives the optical channel switching device shifter, connects the light signal receiving terminal and the one second main optical channel of using of this optical communication terminal installation;One luminous power measuring element is used to monitor that this is second main with the luminous power on the optical channel;When wherein this luminous power measuring element can't detect this second master with the luminous power on the optical channel, this transmission optical channel switching device shifter switches to an optical channel fault point checkout gear with this first main connection with optical channel, and this reception optical channel switching device shifter also switches to this optical channel fault point checkout gear with this second main connection with optical channel.
- 7. the servicing unit that is used for optical cable monitoring system as claimed in claim 6, wherein this optical channel fault point checkout gear is an optical time domain reflectometer.
- 8. the servicing unit that is used for optical cable monitoring system as claimed in claim 7, wherein this transmission optical channel switching device shifter and/or this reception optical channel switching device shifter are two pairs two optical channel switchs.
- 9. the servicing unit that is used for optical cable monitoring system as claimed in claim 7, wherein this transmission optical channel switching device shifter and/or this reception optical channel switching device shifter comprise two a pair of two optical channel switchs.
- 10. the servicing unit that is used for optical cable monitoring system as claimed in claim 6, wherein this first master is by an optical channel switch with this second master with optical channel and being connected of this optical channel fault point checkout gear with optical channel.
- 11. the fiber optic cable monitor method with the automatic protection mechanism of broken string comprises:The main luminous power with optical channel of monitoring one is to judge that this master is with optical channel fault whether;When this master is determined fault with optical channel, communication is switched to a spare optical channel, and start a fault point trace routine.
- 12. the fiber optic cable monitor method with the automatic protection mechanism of broken string as claimed in claim 11, wherein this fault point trace routine comprises selection one test light passage, and uses an optical channel fault point checkout gear to locate the fault point of this test light passage.
- 13. the fiber optic cable monitor method with the automatic protection mechanism of broken string as claimed in claim 12, wherein this optical channel fault point checkout gear is an optical time domain reflectometer.
- 14. the fiber optic cable monitor method with the automatic protection mechanism of broken string as claimed in claim 12, wherein the selection of this test light passage is by an optical channel switch.
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