CN100484072C - Synchronous digit transmission equipment and method thereof - Google Patents
Synchronous digit transmission equipment and method thereof Download PDFInfo
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- CN100484072C CN100484072C CNB2004100455840A CN200410045584A CN100484072C CN 100484072 C CN100484072 C CN 100484072C CN B2004100455840 A CNB2004100455840 A CN B2004100455840A CN 200410045584 A CN200410045584 A CN 200410045584A CN 100484072 C CN100484072 C CN 100484072C
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Abstract
The sync digital transmission equipment includes cross unit creating connection to the service access unit via the service bus to complete the service dispatching between service access units, clock unit providing the system with sync clock, and control unit controlling the cross unit and the clock unit to complete the system configuration and monitoring. The cross unit includes bus operation mode in at least one frequency, the clock unit provides at least one clock frequency backing up sync clock bus operation mode, and the control unit identifies information based on the bus rate the service access unit connected to the cross unit and allocates the service access unit, the cross unit with corresponding sync clock and selects corresponding bus operation mode. The present invention also discloses corresponding sync digital transmission method. The sync digital transmission equipment and method can raise bandwidth access capacity on the basis of traditional SDH or SONET equipment while maintaining forward compatibility.
Description
Technical field
The present invention relates to optical transmission device in the communication technology, refer to a kind of synchronous digital transmission (SDH, Synchronous Digital Hierarchy or SONET, Synchronous Optix Network) Apparatus and method for especially.
Background technology
20th century the mid-80, optical fiber communication begins in the communication network large-scale application, mainly is conceived to point-to-point transmission and adopts accurate (PDH) transmission system synchronously.Along with the progressively formation and the expansion of fiber optic backbone network, user and professional constantly increase, yet not have unified standard optical interface, can not the transverse compatibility multi-vendor equipment, the limited PDH transmission system development trend obvious and optical fiber communication of transmission rate is not inconsistent.
For this reason, U.S. Bellcore has proposed the notion of phototiming transmission network, develops into SDH (Synchronous Digital Hierarchy) afterwards, is not only applicable to optical fiber and also is applicable to microwave and satellite transmits.
Please refer to shown in Figure 1ly, current SDH equipment generally comprises control unit 1, clock unit 2, cross unit 3 and orderwire unit 4.Wherein said control unit 1 is finished the configuration and the monitoring of whole system; Described clock unit 2 is finished the synchronizing function of clock, provides synchronised clock to system; Described orderwire unit 4 is responsible for processes overhead information, and described cross unit 3 is cores of whole system, finishes the service dispatching between each service access unit 5.
Usually, connect by service bus between cross unit 3 and the service access unit 5.The service bus of SDH equipment (synchronous digital transmission equipment) generally adopts communication bus (Telecom Bus) at present, bus frequency can be 38M or 77M, and the frequency of communication bus is fixed, can not change, so the bandwidth of each service access unit 5 also fixing (being that access capacity is also fixed) can not be expanded.Development along with telecommunication service, require the access bandwidth of optical transmission device to increase, have only the new optical transmission device of exploitation to satisfy so, the general access capacity that all adopts the method that promotes bus frequency to strengthen each service access unit 5, for example, use the low-voltage differential signal (LVDS of higher rate, Low VoltageDifferential Signaling) bus, but after doing like this, the plate of Kai Fa various low rate buses all can not use on new equipment in the past, and the bus of two-forty can not be used on old equipment, causes the client to invest waste, the wasting of resources in the past.
Summary of the invention
The problem that the present invention solves provides a kind of synchronous digital transmission equipment and method, lifting means bandwidth access capability on traditional SDH or sonet equipment basis, and keep compatible forward, existing synchronous digital transmission equipment avoids waste.
For addressing the above problem, synchronous digital transmission equipment of the present invention, comprise by service bus and service access unit connect and finish service dispatching between the service access unit cross unit, provide the clock unit of synchronised clock and the control unit that control cross unit and clock unit are finished the configuration and the monitoring of whole system to system.Described cross unit comprises the bus operation mode of at least two kinds of frequencies, described clock unit provides at least two kinds of clock frequencies of supporting the synchronised clock bus operation mode, described control unit distributes the corresponding synchronous clock and selects corresponding bus operation mode for service access unit, cross unit according to the Bus Speed identifying information of the service access unit that is connected with cross unit.
Institute's control unit comprises: the Bus Speed parsing module, according to the Bus Speed identifying information of service access unit, resolve the service bus speed that is used to connect service access unit and cross unit; Clock selection module according to the service bus speed that parses, is distributed to the service access unit with the synchronised clock of corresponding clock frequency; Mode selection module according to the service bus speed that parses, selects corresponding bus operation mode to distribute to the service access unit.
The compatible multiple speed of described service bus.Described clock unit provides at least two kinds of clock frequencies of supporting the synchronised clock bus operation mode; When the clock frequency of two or more synchronised clock bus operation mode is provided, the constant phase difference between each clock frequency.
Correspondingly, synchronous digital transmission method of the present invention may further comprise the steps: the service access unit inserts; Read the Bus Speed identifying information of this service access unit; According to the Bus Speed identifying information of this service access unit, distribute the synchronised clock of corresponding frequencies for service access unit, cross unit and select the bus operation mode of corresponding frequencies.
Compared with prior art, the present invention has the following advantages:
Because between the fundamental frequency synchronised clock of clock unit 7 and the frequency variable synchronous clock fixing frequency and phase relation are arranged, this has brought very big convenience for the compatible design of service bus.
For same group of bus, for example, the bandwidth that is operated under the bandwidth ratio 38M bus work mould under the 77M bus operation mode is doubled, and this just makes the veneer at the identical higher access capacity of service access unit exploitation bring possibility.
At the same service access unit of synchronous digital transmission equipment slot, both can insert the old service access veneer of low rate bus, also can insert the service access veneer of two-forty bus newly developed, reach under the modification situation of trying one's best few, promote the service accessibility of original synchronous digital transmission equipment, keep forward compatibility simultaneously.
Description of drawings
Fig. 1 is a prior art synchronous digital transmission equipment block diagram.
Fig. 2, the 3rd, service bus bandwidth principle schematic.
Fig. 4 is a synchronous digital transmission equipment embodiment block diagram of the present invention.
Fig. 5 is the refinement block diagram of clock unit among Fig. 4.
Fig. 6 is the applicating flow chart of synchronous digital transmission equipment of the present invention.
Fig. 7 is a service bus rate-compatible schematic diagram in the synchronous digital transmission equipment of the present invention.
Embodiment
Please refer to shown in Figure 2ly,, generally adopt 38M Telecom Bus to connect cross unit and service access unit for the low side synchronous digital transmission equipment that is in Access Layer.This 38M Telecom Bus transmits a STM-1 (Synchronous Transfer Mode, synchronous transfer mode) signal with 4 connections, and promptly frequency is the signal of 155M.Like this, 4 service bus are one group of connection, when service bus 38M frequency (as, adopt 38M Telecom Bus) time, the bus bandwidth of a STM-1 (155M) can be provided; If service bus speed is elevated to 77M, then can provide the bus bandwidth (as shown in Figure 3) of 2 STM-1.In like manner, be electrically connected under the situation of permission, service bus speed can also continue to promote, and under the situation of identical physical connection, the service bandwidth that can transmit is improved like this, has promptly strengthened the access capability of synchronous digital transmission equipment.
Synchronous digital transmission equipment of the present invention can realize that according to above-mentioned Bus Speed conversion principle conventional synchronous digital transmission equipment access bandwidth ability enlarges; simultaneously again can the compatible low speed service access unit of exploitation in the past; realize smooth upgrade, the protection client invested in the past.
Please refer to shown in Figure 4, synchronous digital transmission equipment of the present invention comprise by service bus and service access unit 51,52 connect and finish service dispatching between the service access unit 51,52 cross unit 6, provide the clock unit 7 of synchronised clock and the control unit 8 that control cross unit 6 and clock unit 7 are finished the configuration and the monitoring of whole system to system.
Described cross unit 6 comprises the bus operation mode (comprising 38M bus operation mode and 77M bus operation mode in the present embodiment) of some kinds of frequencies.
Described clock unit 7 provides the some kinds of clock frequencies (38M and 77M clock frequency are provided in the present embodiment, give cross unit 6 together) of supporting the synchronised clock bus operation mode.Please in conjunction with shown in Figure 5, described clock unit 7 comprises clock source, the phase-locked module of clock and frequency multiplier, the clock source has stationary phase and frequency fundamental frequency synchronised clock (being the 38M synchronised clock in the present embodiment) by the phase-locked module output of clock, the fundamental frequency synchronised clock is by frequency multiplier output frequency variable synchronous clock (being two frequencys multiplication in the present embodiment, output 77M synchronised clock).In addition, in order to guarantee professional sequential relationship, the phase difference between 38M and the 77M synchronised clock should be constant.
Described control unit 8 distributes the corresponding synchronous clock and selects corresponding bus operation mode (38M bus operation mode or 77M bus operation mode) for service access unit 51,52, cross unit 6 according to the Bus Speed identifying information of the service access unit 51,52 that is connected with cross unit 6.
Described control unit 8 further comprises:
The Bus Speed parsing module according to the Bus Speed identifying information of service access unit 51,52, is resolved the service bus speed that is used to connect service access unit 51,52 and cross unit 6;
Clock selection module according to the service bus speed that parses, is distributed to service access unit 51,52 with the synchronised clock of corresponding clock frequency;
Mode selection module according to the service bus speed that parses, selects corresponding bus operation mode (38M bus operation mode, 77M bus operation mode) to distribute to service access unit 51,52.
Please refer to shown in Figure 6, with Bus Speed 38M, 77M is an example, service access unit 51,52 generally all have oneself identification information, and (ID that for example uses service board is as the Bus Speed identifying information, 001 represents the 38M plate, 010 represents 77M plate Bus Speed identifying information) in service access unit 51, during 52 insertions, this Bus Speed identifying information can pass to control unit 8, after the service access unit 51 of control unit 8 these insertions of identification is the 38M Bus Speed veneer of in the past developing, can use for service access unit 51 by the synchronised clock of clock selection module control clock unit 7 output 38M, control cross unit 6 simultaneously and adopt the 38M bus operation mode for the connection of correspondence; If it is 77M Bus Speeds newly developed that control unit 8 recognizes service access unit 52, then send the 77M synchronised clock to give service access unit 52, control cross unit 6 simultaneously and adopt the 77M bus operation mode for the connection of correspondence by clock selection module control clock unit 7.Synchronous digital transmission method of the present invention like this may further comprise the steps: the service access unit inserts; Read the Bus Speed identifying information of this service access unit; According to the Bus Speed identifying information of this service access unit, distribute the synchronised clock of corresponding frequencies for service access unit, cross unit and select the bus operation mode of corresponding frequencies.
Please refer to shown in Figure 7ly, the compatible multiple speed of described service bus is worked under multiple frequency bus mode of operation.The service bus of cross unit 6 is the system bus of single-frequency just, but system bus that can frequency conversion.As the cross unit bus of existing low side synchronous digital equipment the 38M Telecom Bus of fixed frequency, and in the embodiment of the invention, under the support of clock unit 7, same group of bus of cross unit 6 can be operated under the 38M frequency mode of operation, also can be operated under the 77M frequency bus mode of operation.To be control unit 8 decide according to the Bus Speed that inserts service access unit that should service bus in the selection of bus operation mode.
In sum, because between the fundamental frequency synchronised clock of clock unit 7 and the frequency variable synchronous clock fixing frequency and phase relation are arranged, this has brought very big convenience for the compatible design of service bus.
For same group of bus, for example, the bandwidth that is operated under the bandwidth ratio 38M bus work mould under the 77M bus operation mode is doubled, and this just makes the veneer at the identical higher access capacity of service access unit exploitation bring possibility.
At the same service access unit of synchronous digital transmission equipment slot, both can insert the old service access veneer of low rate bus, also can insert the service access veneer of two-forty bus newly developed, reach under the modification situation of trying one's best few, promote the service accessibility of original synchronous digital transmission equipment, keep forward compatibility simultaneously.Like this, synchronous digital transmission equipment is if having a plurality of service accesses unit slot, can realize that this synchronous digital transmission equipment works under multiple frequency at the same time.
Claims (5)
1, a kind of synchronous digital transmission equipment, comprise by service bus and service access unit and connecting and the cross unit of finishing service dispatching between the service access unit provides the clock unit of synchronised clock and control cross unit and clock unit to finish the control unit of the configuration and the monitoring of whole system to system, it is characterized in that, described cross unit comprises the bus operation mode of at least two kinds of frequencies, described clock unit provides at least two kinds of clock frequencies of supporting the synchronised clock bus operation mode, described control unit is given service access unit cross unit distribution corresponding synchronous clock and is selected corresponding bus operation mode according to the Bus Speed identifying information of the service access unit that is connected with cross unit.
2. synchronous digital transmission equipment as claimed in claim 1 is characterized in that, institute's control unit comprises:
The Bus Speed parsing module according to the Bus Speed identifying information of service access unit, is resolved the service bus speed that is used to connect service access unit and cross unit;
Clock selection module according to the service bus speed that parses, is distributed to the service access unit with the synchronised clock of corresponding clock frequency;
Mode selection module according to the service bus speed that parses, selects corresponding bus operation mode to distribute to the service access unit.
3. synchronous digital transmission equipment as claimed in claim 1 or 2 is characterized in that, the compatible multiple speed of described service bus.
4. synchronous digital transmission equipment as claimed in claim 1 is characterized in that, described clock unit provides at least two kinds of clock frequencies of supporting the synchronised clock bus operation mode; When the clock frequency of two or more synchronised clock bus operation mode is provided, the constant phase difference between each clock frequency.
5. a synchronous digital transmission method is characterized in that, this synchronous digital transmission method may further comprise the steps:
The service access unit inserts;
Read the Bus Speed identifying information of this service access unit;
According to the Bus Speed identifying information of this service access unit, distribute the synchronised clock of corresponding frequencies for service access unit cross unit and select the bus operation mode of corresponding frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100455840A CN100484072C (en) | 2004-06-07 | 2004-06-07 | Synchronous digit transmission equipment and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100455840A CN100484072C (en) | 2004-06-07 | 2004-06-07 | Synchronous digit transmission equipment and method thereof |
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| CN1708024A CN1708024A (en) | 2005-12-14 |
| CN100484072C true CN100484072C (en) | 2009-04-29 |
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| CNB2004100455840A Expired - Fee Related CN100484072C (en) | 2004-06-07 | 2004-06-07 | Synchronous digit transmission equipment and method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109120369B (en) * | 2018-11-23 | 2019-03-05 | 湖南有马信息技术有限公司 | A kind of SDH data processing method, system and relevant apparatus |
| CN110995390B (en) * | 2019-12-23 | 2020-10-30 | 中国电子科技集团公司第三十四研究所 | Method for transparent transmission of SDH bus data based on FPGA |
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