WO1993013615A1 - Interconnexion d'un reseau de transmission - Google Patents
Interconnexion d'un reseau de transmission Download PDFInfo
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- WO1993013615A1 WO1993013615A1 PCT/JP1992/001673 JP9201673W WO9313615A1 WO 1993013615 A1 WO1993013615 A1 WO 1993013615A1 JP 9201673 W JP9201673 W JP 9201673W WO 9313615 A1 WO9313615 A1 WO 9313615A1
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- data
- cross
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- connect
- virtual container
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0003—Switching fabrics, e.g. transport network, control network
- H04J2203/0005—Switching elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0028—Local loop
- H04J2203/0039—Topology
- H04J2203/0041—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0028—Local loop
- H04J2203/0039—Topology
- H04J2203/0042—Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0064—Admission Control
- H04J2203/0067—Resource management and allocation
- H04J2203/0071—Monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
Definitions
- the present invention relates to interconnecting communication networks, and more particularly, the present invention relates to digital cross-connect devices.
- the International Brass and Telephone Consultative Committee has compiled a set of recommendations describing a methodology for a recently proposed digital transfer network called Synchronous Digital Hierarchy (SDH).
- SDH Synchronous Digital Hierarchy
- the CCITT Recommendations are functionally related, not how to implement a particular device. Thus, it is possible to combine certain functional blocks to form a specific type of device.
- a digital cross-connect element is provided to enable communication facilities to communicate with each other.
- This D is essentially a digital switching matrix with an operational interface for setting up relatively static connections between input and output signals or channels.
- the switching capacity of the switch matrix must be large because all ring channels must pass through. Usually, about a few channels are actually required between the two rings, so the conventional DXC, which has moved up, wastes hardware and increases the equipment cost. Furthermore, a common problem with all types of rings is that if service demand unexpectedly increases in some parts of the ring, the entire ring must be designed to provide new capacity. Since traditional DXC is already expensive and capacity has its inherent waste, it is not practical to have spare capacity, so DXC will require costly changes as ring traffic increases It may also be necessary to replace all. Another problem is interconnecting several rings without affecting the integrity of each ring. In this regard, in the conventional DXC, each channel (virtual container: VC) constituting the data stream is closed. We have to reconstruct the bath header of the composition VC traffic that is effectively terminated in the connector and passes through D. This presents problems for maintaining end-to-end bus continuity and bus monitoring as desired in all SDH networks. Disclosure of the invention
- a detailed study of the application of networks to SDH equipment has shown that certain nodes where ring-shaped and mesh-like networks are interconnected can be specifically deployed for successful deployment. It turned out that a form of equipment was needed. Using conventional SDH cross-connect equipment on these nodes is inefficient and costly.
- a very powerful and flexible combination of at / drop and cross-connect that provides a newly combined functional element hereinafter referred to as at-no-drop cross-connect (ADX).
- a combination of functions with different characteristics is adopted.
- the add / drop function is defined for the multiplexer device, while the cross-connect function is described in the function block description of the synchronous digital cross-connect device. Only introduced inside.
- the pad / drop function is generally used in a ring network structure in the past, while the cross connect function is usually used in a more complex mesh network.
- the adoption of a ring structure for the transmission network was only possible due to recent changes in the SDH Recommendation.
- the AM concept makes it possible and provides sufficient scalability for the cross-connect. Is given.
- a digital cross-connect device for interconnecting first and second communication networks each having first and second plurality of data channels, each of which comprises: Channel information data and communication management data in the talk are multiplexed therein, connected to the first network, and selectively extracting data of the selected channel of the first data channel therefrom. And an output connected to the second network and receiving the extracted data from the first network and receiving management data from the first network.
- a digital switch matrix having an input connected to the attuned unit, so that the management data is stored in the switch mat.
- a digital cross-connect device is provided that is capable of reaching the second network via a link, thereby facilitating end-to-end bus monitoring of the two networks.
- the management information of the channel passing through the switch matrix is not removed (not decomposed) from it, so that there is no need to reconstruct this information at the output of the switch means. This keeps the path from one node on one ring to the node on the other ring linked, thereby facilitating reliable end-to-end surveillance. You.
- a switching means connected between the first and second add-drop means for passing data between the first and second add-drop means;
- the data of the selected data channel of the first data channel can be selectively dropped from the first data stream, and the dropped data is passed through the switch means. Reaching the second hatch means and thereby attaching to the second data stream;
- the second add drop means is capable of selectively dropping data of a selected data channel of the second data channel from the second data stream.
- the dropped data arrives at the first ad / dap means via the switch means and is thereby added to the first data stream,
- Management information about the dropped channels of the first and second status streams is maintained and passed through the switch means, thereby preserving the path continuity of the channels, and
- a digital cross-connect device is provided in which the end-to-end path monitoring of each network is followed.
- One of the main applications of the ADX device embodying the present invention is for the connection of traffic from several rings and the transmission of traffic to other network elements.
- ADX devices embodying the present invention over conventional multiplexers or cross-connect devices is that the integrity of ring traffic is preserved and only selected traffic channels pass through the cross-connect switch. That is. This will result in simplified management and control of the network.
- FIG. 1 is a functional block diagram of an add-drop crossconnect (ADX) embodying the present invention
- Figure 2 is a more detailed functional block diagram of Figure 1;
- Figure 3A is a schematic diagram of a communication system with two ring networks interconnected by a conventional cross-connect
- FIG. 3B corresponds to FIG. 3A, but schematically shows two rings interconnected by an add-Z drop cross-connect embodying the present invention
- Figure 4A is a detailed block diagram of the conventional cross-connect of Figure 3A;
- Figure 4B is a detailed block diagram of the add / drop cross-connect of Figure 3B. Check diagram;
- FIG. 5A is a diagram showing an example of the operation of the conventional cross-connect of FIG. 3A.
- FIG. 5B is a diagram showing a corresponding example of the operation of the at-drop-cross connector of FIG. 3B;
- Figure 6 is a functional block diagram of a conventional crossconnect (for comparison with Figure 1);
- Figure 7 is a more detailed functional block diagram corresponding to Figure 6 (for comparison with Figure 2);
- 8A to 10C are block diagrams showing how an add / drop cross connect embodying the present invention can be used in combination with an SDH line transmission device;
- FIGS. 11A to 12C are block diagrams showing that an atnode-drop cross-connect device embodying the present invention can be used in combination with another example of an SDH line transmission device;
- FIG. 13 is a schematic diagram illustrating the use of an ADX device embodying the present invention as a gateway node for local, regional and national network traffic;
- FIG. 14 is a schematic diagram showing an example in which an ADX device embodying the present invention is used for interconnecting a ring network and other network elements; and FIG. 15 is an ADX device embodying the present invention.
- FIG. 2 is a schematic block diagram showing an example in which is used for interconnecting three ring networks and a local exchange. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows the functional structure of an ADX device 10 embodying the present invention.
- the Switch Tunit L PX (Low-Order Group Cross-Connect) 12 is a central unit for switching the transmission traffic channel in a desired direction. Plays a role.
- the virtual container (VC) bus is interconnected via the cross-connect of Figure 1 without having to terminate the constituent VC traffic passing through the ADX and without having to reconfigure its overhead. This is important to maintain the desired end-to-end path integrity and bus monitoring in all SDH networks.
- the time slot allocation function (TSAF) 14 is a cross-connection target in the LPX12 without having to demultiplex and terminate all incoming traffic channels as in the case of the conventional cross connect (DXC). Allows selection of an appropriate channel for SDH frames. Since only the cross-connected paths between different networks pass through LPX12, the switch capacity is more effectively utilized.
- the Overhead Access (0HA) function block 16 provides access to the transmission overhead function where needed. Access and are presented in an integrated fashion.
- the message communication function (MCF) 18 receives messages from the data communication channel (DCC), the Q- and F-interfaces and the adx SEHF20, and serves as a buffer thereof.
- the ADX Synchronous Facility Management Function (adx SEMF) 20 converts performance data and device specific hardware alarms into object oriented messages for transmission over DCC and Z or Q interfaces. It also transforms object-oriented messages associated with other management functions for passage through Sn reference points.
- the ADX timing source function (adx TS) 22 provides an appropriate time reference to the function block shown in FIG. This function block performs the function of the internal oscillator and the function of the ADX timing generator.
- the ADX timing physical interface (adx TPI) 24 is the interface between the external synchronization signal and the adx TS22, and is used for G.703 synchronization. It has one physical property of the interface. Other functional blocks will be described with reference to FIG.
- Fig. 2 shows the functional blocks that make up the synthetic functional elements (TTF, etc.) of AM10 shown in Fig. 1.
- the definitions of the various functional blocks shown in Figure 2 are given in CCITT Recommendations G.782 and G.783.
- the transfer termination function (TTF) 26 includes SDH physical interface (SPI) 28, reconstructed section termination (BST) 30, multiple section termination (MST) 32, multiple section protection (MSP) 34, and It consists of 36 sections (SA).
- the RST30 generates the reconfiguration section over and the head RS0H (STM-N signal section overhead S0H lines 1 to 3) in the process of generating the SDH frame signal. In the opposite direction, it terminates RS0H.
- the MST32 generates a multi-section overhead MS0H (lines 5 to 9 of STM-N S0H) in the process of generating the SDH frame signal, and terminates MS0H in the opposite direction.
- the MSP34 is intended to switch the signal between the two MSTs from the working section to the spare section, self-serving.
- SA36 processes the AU-3 / 4 pointer indicating the phase of P0H of VC-3 / 4 with respect to S0H of STM-N, disassembles and assembles the STM-N frame.
- TSAF14 consists of a higher-order group path connection (HPC) 38, a higher-order group path termination (HPT) 40, a higher-order group path adaptation (HPA) 42, and a lower-order group path connection (LPC 4). It is defined in the CCITT Recommendation.
- the HPC38 provides a flexible interconnection of the higher-order group VCs (VC-3 / 4), and the HPT40 generates an appropriate VC pathoverhead (P0H) at the path source, as shown in FIG. Add to container and remove P0H of VC in pass sink Then, the higher-order group path is terminated by reading.
- the HPA42 processes the TU pointer indicating the phase of the POH of VC-1 / 2/3 (low-order group path VC) with respect to the POH of VC-3 / 4, and performs complete disassembly of VC-3 / 4. This adapts the lower-order group VC (VC-1 / 2/3) to the higher-order group VC (VC-3 / 4).
- LPC44 allows for flexible interconnection of VC-1 / 2/3.
- Higher order group assembler (HA) 46 consists of ⁇ 40 and HPA42.
- the high-order group interface (HI) 48 comprises a physical interface (PI) 50, a low-order group bus adaptation (LPA) 52, and an HPT 40.
- the LPA 52 adapts the PDH (Asynchronous Digital Hierarchy) signal to the SDH network by mating or demapping the signal into or out of the synchronous container. If the signal is asynchronous, the mapping process involves adjusting the bit level.
- PDH Asynchronous Digital Hierarchy
- the low order group interface (LI) 54 includes a PI50, LPA 52, and a low order group path termination (LPT) 56.
- LPT56 terminates the low-order group path by generating and adding the appropriate VC POH to the associated container in the bus source, and removing and reading the VC POH in the bus sink.
- the low-order group connection monitoring (LCS) 58 monitors unset and configured low-order group connections. It is arbitrary or degenerate because the same information flows between its input and output (LCS acts as a source and sink for a part of the low-order group bus head).
- 3A and 3B show comparative examples to explain the difference between the approach using the conventional cross-connect DXC and the approach using the new add / drop cross-connect ADX.
- FIG. 3A illustrates a conventional method of interconnecting two ring networks 60, 62, such as an optical ring network.
- Each loop 60, 62 has a plurality of communication facilities (not shown) connected to it, each of which is connected to an add-Z drop multiplexer (ADM) S4. Therefore, it is connected to the ring.
- ADM add-Z drop multiplexer
- Each of these at-drop multiplexers 64 receives (drops) data from a particular channel of the data stream (eg, at 140 MHz) carried by the ring, or places it on a particular channel. Enables you to send (add) data.
- FIG. 3A all ring traffic from loops 60 and 62 passes through the switch matrix 68 of cross-connect 66, but only the required channels in FIG. 3B. Is selected by the pad drop unit 70 which contains the two TTFs 26 and TSAFs 14 shown in FIG. 1 and is passed from the loop 60 to the loop 62 using the switch matrix unit 74 of the ADX72.
- Fig. 4 shows an expanded version of the idea shown in Fig. 3, and shows a simple comparison between the operation of the conventional DXC and ADX at a certain level of the SDH hierarchy.
- VC-3 ie, a virtual container at hierarchy level 3
- STM-1 synchronous transfer module type 1
- traffic from the STM-1 line passes through TTF26 and TSAF14, and TSAF14 ties the appropriate VC-3 of the STM-1 signal to the cross connection via LPX12. Select only the slot. In this particular example, only two inputs and two output ports of the LPX12 are It turns out that it is occupied.
- FIG. 5 further illustrates the same principle as FIG.
- an STM frame 76 is processed by a TTF (Transmission Termination Function) 26 that allows access to management information in a DCC (Data Communication Channel) that is placed in the overhead of the STM frame. Is done.
- TTF Transmission Termination Function
- DCC Data Communication Channel
- VC-3 is passed to LPX12 consisting of conventional DXC, and LPX12 performs the switching function for all input VC-3.
- the output from LPX12 is multiplexed to ⁇ (higher order group assembler) 46 to VC-4 and passed to TTF function 26 for appropriate overhead and insertion of management information.
- the STM frame 76 is a TTF (transfer termination) that enables access to management information in a DCC (data communication channel) contained in the STM frame overhead.
- Function Processed by 26.
- TSAF Time Slot Assignment Function
- the appropriate (shaded) VC-3 is passed to ADX LP2, and LPX12 is cross-connected between STM-1 frames. Performs the retransfer function between the two to be activated.
- Each VC-3 that has passed LP 2 is incorporated by TSAF 14 into the appropriate STM frame and sent to TTF 26 to import the appropriate overhead and management information.
- the present invention embodies the present invention despite the fact that the ADX structure was comprised of some of the functional blocks used in the quad-plexer and the digital cross-connect device.
- the resulting ADX device provides more (in terms of function and flexibility) than just the sum of its constituent functional elements combined in the usual manner.
- ADX offers savings in hard-to-reach requirements and in the simplicity of monitoring and controlling transmission network traffic.
- Figs. 6 and 7 For comparison with the functional structure of the ADX device according to the present invention shown in Figs. 1 and 2, the functional structure of the synchronous digital cross connect (DXC) described in the CCITT recommendation and the composite functional element therein Fig. 6 and Fig. 7 Are shown below. As shown in Figs. 6 and 7, in DXC, all virtual containers from STM- are supplied to LPX.
- DXC synchronous digital cross connect
- the LP5Q2 of the ADX device according to the present invention has a high-order group signal and a low-order group compliant with STM-G.703 in addition to a branch of an at-no-drop unit that includes two TTFs 26 and a TSAF 14.
- the ADX device of the present invention can be used as a termination multiplexer, at'Z drop. It can implement the basic elements of SDH, such as multiplexers, add / drop cross-connects, and cross-connects.
- FIG. 8 shows some application examples of how the ADX device (ADX4 / 1) embodying the present invention can be used in combination with the Fujitsu FLM2400E and FLM600E class SDH line transmission devices.
- Figure 8A shows an application of the ADX as a terminating multiplexer where the 16X STM-1 line from the FLM2400E TBM unit is demultiplexed to a basic rate of 2Mbits Z seconds.
- Figure 8B shows an example of the application of ADX as an Add-Z drop multiplexer where the 16X STM-1 line from the FLM2400E ADM unit is demultiplexed to a basic speed of 2 Mbits Z seconds.
- any 2 Mbit / s channel within the main STM-16 line (ring) is accessible via ADX.
- FIG 8C shows an example of ADX application as an add-on Z-connector-to-connector where 8X STM-1 lines from each of the FLM2400E ADM units are demultiplexed to a basic rate of 2 Mbit / s. Any 2 Mbit / s channel in the main STM-16 line (ring-shaped) STH-1 frame is accessible via ADX.
- Figure 8D shows an example of the application of ADX as a cross-connect where the 8X STM-1 line from the FLM2400E ADM unit is demultiplexed to a basic speed of 2 Mbit / s, and the main STM-16 line (ring Any of the 2 Mbit / s channels in the 8X STM-1 frame in (state) is accessible via ADX. Traffic from the FLM2400E can also be interconnected with two FLM600E TRMs and selected traffic channels from the ADM unit.
- FIG. 9 shows that the ADX device (ADX4 / 1) embodying the present invention is FLM600E and
- Figure 9A shows an example of the application of ADX as a terminating multiplexer in which 4X STM-1 lines from four FLM600E TRM units are demultiplexed into 2 Mbit / s at the basic speed.
- Figure 9B shows an application example of ADX as a pad / drop cross-connect where the 4X STM-1 line from the FLM2400E ADM unit is demultiplexed to 2 Mbit / s at the base rate.
- any 2 Mbit / s second channel in the main STM-4 line (ring) is accessible via ADX.
- Figure 9C shows an example of the application of ADX as a cross-connect in which 4X STM-1 lines from each of the FLM600E units are demultiplexed to the basic speed of 2 Mbit / s. Any 2-Mbit, Z-second channel in the 4X STM-1 frame of the application is accessible via ADX. Traffic from the FLM600E unit is also cross-connected to the 8X STM-1 line (ring) connected to the ADM via the FLM150E using a 2 Mbit / s interface. You.
- Figure 10 shows some application examples of how the ADX 4/1 can be used in combination with the Fujitsu FLM150E class SDH line transmission device.
- Figure 10A shows an example of the application of ADX as a terminating multiplexer where 16X STM-1 lines from 16 FLM150E TM units are demultiplexed to a basic rate of 2 Mbit / s.
- Figure 10B shows an example of the application of ADX as an ad-hod drop where the 16X STM-1 line from the FLM150E ADM unit is demultiplexed to the basic speed of 2 Mbit / s.
- any 2 Mbit / s channel in the main STM-1 line (ring) is accessible via ADX.
- Figure 10C shows an example of the application of ADX as a cross-connect where the 16X STM-1 lines from each of the FLM150E ADMs are demultiplexed to 2 Mbit / s at the base rate.
- the main STM-1 line STM- Any 2 Mbit / s channel in one frame is accessible via AM.
- Traffic from the FLM150E unit can also be cross-connected between 32 STM-1 lines (rings) connected to the ADX via the FLM150E using a 2M bit-second interface .
- Figure 11 shows some application examples of how the ADX 4/1 can be used with STM-1 AD, STM-4 TRM and STM-4 AD interface units.
- Figure 11A is based on the ⁇ STM-1 line. It shows an application example of ADX as a terminating multiplexer demultiplexed to 2 Mbit / s of speed.
- Figure 11B shows an example of the application of ADX as an add / drop cross-connect in which the 4X STM-1 line is demultiplexed into 2 Mbits Z seconds at the basic rate. In this application, any 2 Mbit / s channel in the main STM-4 line (ring) is accessible via ADX.
- Figure 11C shows an example of the application of ADX as a crossconnect in which the 4X STM-4 line is demultiplexed into 2 Mbits Z seconds at the basic speed, and the 4X STM-4 line of the main STM-4 line is shown. It can be accessed via any 2-Mbit, Z-second channel within one frame. Traffic from the STM-4 line can be cross-connected to the eight STM-1 lines (rings) connected to the ADX via the STM-1 AD interface. Both are possible.
- Figure 12 shows some application examples of how the ADX 4/1 can be used in combination with the Fujitsu FLM150E class SDH line transmission device.
- Figure 12A shows an example of the application of AM as a terminating multiplexer where 16X STM-1 lines from a 16-piece FLM150E TRM unit are demultiplexed to 2 Mbit / s at the base rate.
- Figure 12B shows an application example of the ADX as an at-drop cross-connect in which the 16X STM-1 line from the FLM150E ADM unit is demultiplexed into 2 Mbit / s at the basic speed.
- any 2 Mbit / s channel in the main STM-1 line (ring) is accessible via AM.
- Figure 12C shows an example of the application of ADX as a cross-connect where the 16X STM-1 lines from each of the FLM150E ADMs are demultiplexed to 2 Mbit / s at the base rate, and the main STM-1 line is shown. Any 2 Mbit / s channel in the STM-1 frame is accessible via ADX. Traffic from the FLM150E unit was routed to 32 STM-1 lines (redirected) to the ADX via the FLM150E using a 2 Mbit / second interface. Cross-connection between the two is also possible.
- the device is capable of handling the following interfaces:
- FIG 13 shows an application example of ADX as a gateway for local, regional and national network traffic.
- traffic from the trunk domestic network is accessed via the FLM2400E ADM.
- the STM-1 channels from the main STM-116 line (ring) are demultiplexed into STM-1 tributaries and then connected to the ADX via eight STM-1 tributary terminal units. .
- the STM-1 tributary is then demultiplexed to base speed and the appropriate bus is set up to any ADX tributary unit serving the local and local networks, and vice versa.
- Transmission traffic from the oral network can be directed to the local network or other tributaries within the regional or national network, and vice versa.
- the maximum capacity of the ADX 4/1 is 16 STM-1 and Z or 1008 electrical interfaces.
- connection to other STH-4 and STM-1 or connection to intra-station converter For this, the 756X2M tributary is more usable.
- FIG 14 shows an example of the use of ADX in interconnecting traffic on a ring network and connecting it to other network elements.
- the ADX connects two STH-4 ring traffic to each other and to the central office.
- Other ADX devices are used on different nodes as shown for flexible interconnection of traffic from the STM-1 local loop and other network elements as shown Have been.
- Figure 15 shows an application example of ADX in which three ring networks are connected to a local exchange and connected to each other using STM-1 and STM-4 at-no-drop interfaces.
- Reference number 80 represents the FLM 150E head-to-head multi-brixer
- reference number 82 represents the STM-4 head / head-up light unit
- reference number 84 represents the STM-1 head.
- Z-Dop represents the light unit
- reference number 86 represents a 2 Mbit Z-second G.703 interface unit.
- the traffic collected by loops 88 and 90 can be connected to the central office at any of the nodes 92, 94 or 96. It can also connect to any other node as a dedicated line.
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Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE69224751T DE69224751T2 (de) | 1991-12-20 | 1992-12-21 | Querverbindung eines kommunikationsnetzes |
| CA002104455A CA2104455C (en) | 1991-12-20 | 1992-12-21 | Interconnecting communications networks |
| EP93900372A EP0615367B1 (en) | 1991-12-20 | 1992-12-21 | Cross-connection of communication network |
| US08/107,683 US5416768A (en) | 1991-12-20 | 1992-12-21 | Interconnecting communications networks |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9127116.3 | 1991-12-20 | ||
| GB919127116A GB9127116D0 (en) | 1991-12-20 | 1991-12-20 | Interconnecting communications networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1993013615A1 true WO1993013615A1 (fr) | 1993-07-08 |
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ID=10706632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1992/001673 Ceased WO1993013615A1 (fr) | 1991-12-20 | 1992-12-21 | Interconnexion d'un reseau de transmission |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5416768A (ja) |
| EP (1) | EP0615367B1 (ja) |
| JP (1) | JP3144804B2 (ja) |
| CA (1) | CA2104455C (ja) |
| DE (1) | DE69224751T2 (ja) |
| GB (1) | GB9127116D0 (ja) |
| WO (1) | WO1993013615A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| IT1265424B1 (it) * | 1993-12-22 | 1996-11-22 | Alcatel Italia | Metodo e disposizione ciruitale di realizzazione della funzione di hpa negli apparati sdh |
| US5742605A (en) * | 1994-02-28 | 1998-04-21 | Sprint Communications Co., L.P. | Synchronous optical network using a ring architecture |
| JP3442180B2 (ja) * | 1995-02-23 | 2003-09-02 | 富士通株式会社 | アド・ドロップ・マルチプレクス装置 |
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| JP3366214B2 (ja) * | 1997-02-26 | 2003-01-14 | 富士通株式会社 | 多重化伝送装置 |
| IT1291744B1 (it) * | 1997-05-16 | 1999-01-21 | Alsthom Cge Alcatel | Miglioramenti ad una rete di telecomunicazioni a fibre ottiche a gerarchia sincrona sdh dotata di sistema di protezione condiviso |
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| US6128321A (en) * | 1997-12-19 | 2000-10-03 | Alcatel Usa Sourcing, L.P. | System and method for centrally-managing switching functions |
| JPH11266220A (ja) * | 1998-03-18 | 1999-09-28 | Fujitsu Ltd | Sdh方式の伝送装置 |
| IT1314145B1 (it) * | 1999-12-21 | 2002-12-04 | Cit Alcatel | Metodo e dispositivo per convertire un segnale stm-1 in un segnale sub-stm-1 e vice-versa in trasmissioni radio |
| US6433903B1 (en) | 1999-12-29 | 2002-08-13 | Sycamore Networks, Inc. | Optical management channel for wavelength division multiplexed systems |
| JP2002084249A (ja) * | 2000-09-08 | 2002-03-22 | Fujitsu Ltd | 集中管理装置 |
| DE10065929A1 (de) * | 2000-12-27 | 2002-07-04 | Abb Power Automation Ag Baden | Datenübertragungseinheit zur Erstellung einer digitalen Cross-Connect-Verbindung |
| KR100557138B1 (ko) * | 2003-07-16 | 2006-03-03 | 삼성전자주식회사 | 광 가입자망에서의 영상 데이터 처리 장치 |
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| ES2317752B1 (es) * | 2006-08-01 | 2010-01-08 | Miguel Angel Lopez Maqueda | Repartidor digital gestionable para tramas de 2 mbit/s. |
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| JPS62226744A (ja) * | 1986-03-28 | 1987-10-05 | Hitachi Ltd | ル−プネツトワ−クシステムの伝送装置 |
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| US4967405A (en) * | 1988-12-09 | 1990-10-30 | Transwitch Corporation | System for cross-connecting high speed digital SONET signals |
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| GB9005723D0 (en) * | 1990-03-14 | 1990-05-09 | Plessey Telecomm | Switch for multiplexes |
| US5311501A (en) * | 1991-03-15 | 1994-05-10 | Fujitsu Limited | Routing system for linear add-drop multiplexer |
| US5189673A (en) * | 1991-07-30 | 1993-02-23 | Alcatel Network Systems, Inc. | Method and apparatus for controlling switched video in an optical fiber telecommunications system |
| US5216666A (en) * | 1991-12-12 | 1993-06-01 | Alcatel Network Systems, Inc. | 1:n ring-type signal protection apparatus |
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- 1991-12-20 GB GB919127116A patent/GB9127116D0/en active Pending
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1992
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- 1992-12-21 CA CA002104455A patent/CA2104455C/en not_active Expired - Fee Related
- 1992-12-21 WO PCT/JP1992/001673 patent/WO1993013615A1/ja not_active Ceased
- 1992-12-21 DE DE69224751T patent/DE69224751T2/de not_active Expired - Fee Related
- 1992-12-21 JP JP50880793A patent/JP3144804B2/ja not_active Expired - Fee Related
- 1992-12-21 EP EP93900372A patent/EP0615367B1/en not_active Expired - Lifetime
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| JPS62226744A (ja) * | 1986-03-28 | 1987-10-05 | Hitachi Ltd | ル−プネツトワ−クシステムの伝送装置 |
| JPS6478548A (en) * | 1987-09-19 | 1989-03-24 | Matsushita Electric Industrial Co Ltd | Video signal transmission system |
| JPH022745A (ja) * | 1988-06-16 | 1990-01-08 | Hitachi Ltd | Lan間情報転送制御方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP0615367A4 (en) | 1995-01-25 |
| CA2104455A1 (en) | 1993-06-21 |
| DE69224751T2 (de) | 1998-07-09 |
| CA2104455C (en) | 2002-09-17 |
| DE69224751D1 (de) | 1998-04-16 |
| GB9127116D0 (en) | 1992-02-19 |
| US5416768A (en) | 1995-05-16 |
| JP3144804B2 (ja) | 2001-03-12 |
| EP0615367A1 (en) | 1994-09-14 |
| EP0615367B1 (en) | 1998-03-11 |
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