CN1180461A - Branching unit for an optical fibre transmission system - Google Patents
Branching unit for an optical fibre transmission system Download PDFInfo
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- CN1180461A CN1180461A CN97190126A CN97190126A CN1180461A CN 1180461 A CN1180461 A CN 1180461A CN 97190126 A CN97190126 A CN 97190126A CN 97190126 A CN97190126 A CN 97190126A CN 1180461 A CN1180461 A CN 1180461A
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- branch
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
A branching unit for an optical fibre transmission system has a pair of inputs/outputs for receiving an end of a different section of trunk cable of the type having an electrical conductor and one or more pairs of optical fibres. A switching circuit (8) is effective to selectively route power between the electrical conductors (54, 56) of each trunk section or via an earth return (72) in response to a supervisory signal provided on the trunk.
Description
The present invention relates to a kind of branch units that is used for fiber optic transmission system, it utilizes the power supply power supply of the either direction of trunk line, and can optionally isolate each the cable segmentation that links to each other through branch units.
In the optical fiber telecommunications system course of work that many branches are arranged of long distance, because breaking down or open circuit, the trunk line cable produces many problems, cause in fault and open circuit can not transmitting between each terminal of part two opposite sides.Under this malfunction, can also carry out communication between each terminal of the part that open circuit homonymy from powering to each branch units at homonymy trunk line one end of the part that opens circuit.The difficulty that the fault and the part that opens circuit are keeped in repair is system power supply to be disconnected so that isolate out of order part usually, and this just requires to make whole system not work.The present invention relates to a kind of device, be used for, so that the other parts of system can also operate as normal in the middle of repairing cable segmentation and isolated from power.
The invention provides a kind of branch units that is used for fiber optic transmission system, it has a pair of I/O end of the end of the different segmentations that are used to receive the trunk line cable that has electric lead and one or more pairs of optical fiber, and wherein a change-over circuit is in response to the pilot signal that is provided by trunk line optionally energized or earth return circuit between the electric lead of each trunk line segmentation.
Change-over circuit has self-retaining function, in case realize conversion then can keep this circuit of connection by earthed circuit disappearing until power supply.Change-over circuit comprises a relay.This relay can be a kind of latching relay, realizes in a single day that promptly the circuit that conversion is kept connection by earthed circuit disappears until power supply.Change-over circuit also comprises a triode switch that links to each other with relay coil, and it is driven by the control circuit in response to pilot signal.
Branch units can comprise a diode-bridge circuit, it comprises the branch road of two parallel connections, each branch road has a pair of positive and negative electrode diode in series, each branch road is in the end parallel connection, make diode cathode be connected with negative pole with anodal, negative pole, wherein the tie point between the diode of every pair of branch road is connected with each electric lead of different trunk line cable segmentation, and triode and relay coil switching device are connected between the branch road end.Also provide another to the anodal parallel branch that forms with the negative pole diode in series at this improved branch units, between two parallel branch parallel connected end, connect, and the tie point between the diode of another parallel branch is connected with earth point through being generally the relay normally-closed contact according to the same manner.Between the parallel branch parallel connected end, connect a voltage stabilizing didoe to adjust the voltage of triode and relay coil circuit.
Earth return circuit can be the seabed.
Change-over circuit can be in response to the photoconduction pilot signal that is provided by one of optical fiber.On the other hand, change-over circuit can be in response to the electric pilot signal that provides along electric lead.
The present invention also comprises fiber optic transmission system, it comprises the trunk line cable that is provided with predetermined two or more branch unitss at regular intervals, wherein the change-over circuit in each branch units is in response to different pilot signals, therefore, the pilot signal that provides in response at least one cable end makes between adjacent branch units optionally energized or ground connection, so as can with the isolated from power to the trunk line sectional power supply.
For the present invention and other various outstanding features are understood easily, below only by way of example and with reference to some embodiment of description of drawings, wherein:
Fig. 1 is the photoconduction transmission system schematic diagram that adopts branch units among expression the present invention;
Fig. 2 is the circuit diagram of branch units structure among expression the present invention;
Fig. 3 a is the electric power-feeding structure schematic diagram of photoconduction transmission system among expression the present invention to 3e;
Fig. 4 is the power supply schematic diagram that is illustrated under the malfunction.
Accompanying drawing 1 expression one photoconduction transmission system for example is transmission system under water, and the long-range station 10,12 that it comprises by 14 connections of trunk line cable makes the transmission of communicating by letter betwixt of photoconduction transmission signals.The trunk line cable provides three branch unitss 16,18,20 in the embodiment shown, and they are connected with special-purpose terminal 22,24,26 respectively, and has the I/O end 28,30 that is connected with the end of the different segmentations of trunk line cable; 32,34; 36,38.Each branch units utilizes the wavelength division multiplexing that the specific wavelength conversion of signals is arrived relevant special-purpose terminal, and guides this wavelength signals into trunk line so that it transmits forward along trunk line.The connecting line representative that dots of branch units and special-purpose terminal has only the cable of optical fiber as can be seen, also comprises electric lead and both comprised optical fiber with the trunk line 14 that solid line is represented, electric lead to the branch units power supply so that the circuit working in it.Under the station 10 and 12 controls, no matter which station power this system can both operate as normal.Special-purpose terminal is subordinative, power supply that can not control system, and can utilize from a station and offer the pilot signal of branch units and make special-purpose terminal be in off position.Such problem appears in the system of existing branch units, promptly when breaking down in the trunk line or open circuit place under repair, must stop whole system operation from the two ends deenergization of trunk line.
Consult Fig. 2 below, accompanying drawing 2 expressions one branch units change-over circuit 8, it makes cable segmentation and the isolated from power that breaks down or open circuit, and keeping opening circuit partly simultaneously, the system of each side also keeps operating state.This circuit comprises a control circuit 40, and it is connected with a pair of supply lines 42,44 and has an input 46 that is connected with one of optical fiber in the trunk line.Control circuit is in response to the predetermined pilot signal that provides along trunk line from one of station.But the modulated subcarrier technique of this pilot signal 150KHz, it provides a kind of different specific number to each branch units.The output 48 of control circuit is connected with the base stage of NPN transistor 50.The emitter of triode links to each other with supply lines 44, and collector electrode links to each other with another supply lines 42 by a relay coil 52 simultaneously.Utilize along powering from one of them station to the electric current that the electric lead in the adjacent trunk line segmentation provides at trunk line I/O end (being expressed as 54 and 56).54 are connected with 56 branch roads different with diode-bridge circuit, bridge circuit has the branch road of two parallel connections, each branch road has a pair of both positive and negative polarity diode in series 58,60,62,64, and it is anodal that branch road connects and positive pole, negative pole and negative pole are connected in parallel on supply lines 42 and 44.Line 54 and 56 with two diodes of different branch between tie point be connected.The similar parallel branch that comprises diode 66,68 between supply lines 42 and 44, it also is connected in series with negative pole by anodal between supply lines 42 and 44.Tie point between diode 66 and 68 is connected with the normally-closed contact 70 of earth point 72 (being by sea earth under water in the system) by relay 52.Between supply lines 42 and 44, connect a voltage stabilizing didoe 74, be used to regulate the voltage of control circuit.
In the middle of using, if the branch units according to Fig. 2 equipment of our analytical applications in the device of Fig. 1.When first branch units 16 received from the voltage on the trunk line of the station 10, the current path of I/O end 54 was present in this end and arrives between the sea earth 70 and the voltage that generation is powered to control circuit between supply lines 42,44 by bridge circuit.When a special-purpose pilot signal that is sent by the station 10 is sent to the control circuit 40 of this stand-by unit, confirm and triode 50 applied one to control voltage by control circuit, thereby make triode conducting and make relay coil energising open relay contact 70, make electric current flow out to the next segmentation of trunk line and to 18 power supplies of next branch units, then by confirming that a different special-purpose pilot signal that is sent by this station carries out similar control from I/O end 56.This conversion operations can repeat to be converted operation until all each branch unitss along trunk line according to priority.Be appreciated that it is also feasible providing power supply and pilot signal to carry out similar operation by rightabout from the station 12 of the other end of trunk line.
Control circuit 40 can have the monostable function, and having only special-purpose pilot signal thus is that control signal can keep when transmitting continuously or regularly, and perhaps it is bistable, in case promptly pilot signal is transmitted, it keeps transition status.Relay has a pair of second pair of contact 76 of selecting, it is in closed condition when relay is switched on, so that action in a single day, and relay coil self is switched on from supply lines 42,44, form a latching relay thus, have only that it just returns when trunk line is no longer powered.
Fig. 3 a represents from the electric power thus supplied of the station 10 range ties to 3e.Fig. 3 a represents not have in the system of power supply, is closed in each station repeat circuit contact 70, thereby the current path of earth return circuit 72 is provided.In the station 10 energized, at electric current in first branch units 16 by shown in Fig. 3 b black line, flowing to the station 10 from earth point.Send special-purpose pilot signal then, be enabled in earth-free relay in the branch units 16 for branch units 16, and make electric current in the branch units 18 from earth return circuit by by shown in Fig. 3 c black line, providing electric current.Equally, if send special-purpose pilot signal for branch units 18 now, earth point disconnects in branch units 18, then at the electric current that flows out from earth point in the branch units 20 shown in black line Fig. 3 d.At last, if send special-purpose pilot signal for branch units 20 now, earth point and branch units 20 disconnect, and the electric current that flow through this moment between the station 10 and 12 is shown in Fig. 3 e black line.
The situation that following surface analysis for example breaks down or opens circuit on the trunk line cable between the branch units 18 and 20.Power and power to branch units 20 to branch units 16 and 18 from the station 10 from the station 12, in this case, trunk line segmentation 18 between the station and 20 and power supply isolate, thereby can place under repair, allow simultaneously opening circuit or the side separately of fault is kept in communication.
Though described embodiment adopts detection one special-purpose pilot signal to come start-up control circuit 40, it is contemplated that another kind of device, promptly provides a special-purpose signal of telecommunication from station supply lines.This signal can be a low-frequency modulation signal or a pulse signal.Adopt the structure of this alternative to be considered to be in the scope of the invention.
Said structure has some special advantages: (1) in multichannel dedicated system design, can use the branch units of any amount. (2) in optimum decision system except system cut-off, relay unit can not dead electricity. Because cable Line discharges excessively and can damage relay unit, and therefore, this point is very important safety factor. (3) branch units is two-way. (4) the special-purpose station can not be disturbed work and the harm/destruction system of branch units.
Claims (12)
1. branch units that is used for fiber optic transmission system has: a pair of I/O end is used to receive and has electric lead and one or the end points of the different segmentations of many trunk lines to optical fiber; Wherein change-over circuit (8) carries out optionally energized or earth return circuit (72) in response to the pilot signal that is provided by trunk line between the electric lead (54,56) of each segmentation.
2. according to branch units described in the claim 1, wherein change-over circuit has self-retaining function, in case its transformation energy keeps this connection circuit by earth return circuit (72), disappears until power supply.
3. according to branch units described in claim 1 or 2, wherein change-over circuit comprises a relay (52,70).
4. according to branch units described in claim 1 or 2, wherein change-over circuit comprises latching relay (52,70,76), and it disappears up to power supply in case conversion can keep this connection circuit by earth return circuit (72).
5. according to branch units described in right 3 or 4, wherein change-over circuit comprises the transistor (50) that is connected with relay coil (52), and transistor is driven by the control circuit (40) in response to pilot signal.
6. according to branch units described in the claim 5, one diode-bridge circuit wherein is provided, it comprises the branch road of two parallel connections, each bar branch road has a pair of positive pole and negative pole diode in series (58,60,62,64), two of two branch roads are rectified the utmost point with anodal, negative pole and negative pole also connect, and wherein at each the tie point between the diode of branch road are constituted the tie point of each electric lead (54,56) of different trunk line segmentations, and the transformational structure of transistor (50) and relay coil (52) is connected between the branch road end points.
7. according to branch units described in the claim 6, pair of diodes (66 wherein also is provided, 68) another parallel branch of Xing Chenging, pair of diodes is connected with negative pole by anodal, between the cross-couplings end of two parallel branches, in kind connect connection, and the tie point between two diodes of this another branch road links to each other with earth point (72) by normally closed relay contact (70).
8. according to branch units described in claim 6 or 7, wherein the cross-couplings end in parallel branch connects a voltage stabilizing didoe (74), to adjust the voltage of transistor and relay coil circuit.
9. according to branch units described in above-mentioned arbitrary claim, wherein earth return circuit (72) is the seabed.
10. according to branch units described in above-mentioned arbitrary claim, wherein change-over circuit is in response to the light pilot signal that is provided by one of optical fiber.
11. according to branch units described in any one claim of above-mentioned 1-9, wherein change-over circuit is in response to the electric pilot signal that is provided by electric lead.
12. photoconduction transmission system, comprise: a trunk line cable (14), it is provided with the branch units (16 according to above-mentioned any one described one or more interval of claim, 18,20), wherein the change-over circuit of each branch units (8) is in response to different pilot signals, therefore, in response to the pilot signal that provides by at least one cable end in contiguous branch unit (16,18,20) select energized between, perhaps earth point (72), making will be to the isolated from power of trunk line sectional power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97190126A CN1180461A (en) | 1996-03-01 | 1997-02-28 | Branching unit for an optical fibre transmission system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9604427.6 | 1996-03-01 | ||
| CN97190126A CN1180461A (en) | 1996-03-01 | 1997-02-28 | Branching unit for an optical fibre transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1180461A true CN1180461A (en) | 1998-04-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97190126A Pending CN1180461A (en) | 1996-03-01 | 1997-02-28 | Branching unit for an optical fibre transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1180461A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701493A (en) * | 2013-10-16 | 2014-04-02 | 中国电子科技集团公司第二十三研究所 | Realizing method for single-ended power supply of submarine cable transmission system with repeater through monopolar cable |
| CN103975534A (en) * | 2011-12-22 | 2014-08-06 | 日本电气株式会社 | Branching device, and power supply path monitoring method |
| CN104639260A (en) * | 2013-11-14 | 2015-05-20 | 派得泰科股份公司 | Branching unit for an optical telecommunication link |
-
1997
- 1997-02-28 CN CN97190126A patent/CN1180461A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103975534A (en) * | 2011-12-22 | 2014-08-06 | 日本电气株式会社 | Branching device, and power supply path monitoring method |
| US9143845B2 (en) | 2011-12-22 | 2015-09-22 | Nec Corporation | Branching units and power line monitoring methods |
| CN103975534B (en) * | 2011-12-22 | 2016-05-11 | 日本电气株式会社 | Branch units and power line supervision method |
| CN103701493A (en) * | 2013-10-16 | 2014-04-02 | 中国电子科技集团公司第二十三研究所 | Realizing method for single-ended power supply of submarine cable transmission system with repeater through monopolar cable |
| CN103701493B (en) * | 2013-10-16 | 2016-04-06 | 中国电子科技集团公司第二十三研究所 | There is the implementation method of relaying sea cable transmission system one pole cable single-ended power in seabed |
| CN104639260A (en) * | 2013-11-14 | 2015-05-20 | 派得泰科股份公司 | Branching unit for an optical telecommunication link |
| CN104639260B (en) * | 2013-11-14 | 2018-08-28 | 派得泰科股份公司 | Optical communication link, tributary unit and the method for configuring tributary unit |
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