CN100393049C - Connecting performance tester with ATM apparatus and testing method - Google Patents
Connecting performance tester with ATM apparatus and testing method Download PDFInfo
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- CN100393049C CN100393049C CNB2005100400310A CN200510040031A CN100393049C CN 100393049 C CN100393049 C CN 100393049C CN B2005100400310 A CNB2005100400310 A CN B2005100400310A CN 200510040031 A CN200510040031 A CN 200510040031A CN 100393049 C CN100393049 C CN 100393049C
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Abstract
The present invention discloses a device and a method for testing the connection performance of a cross ATM device. The method is used for testing the connection performance of a permanent virtual chain circuit between a local-end device and a far-end device. The testing device comprises an ATM switching and processing module, an up processing module, a down processing module and a segmentation recombining and controlling module, wherein the ATM switching and processing module is used for receiving and transmitting data and an ATM cell which are used for a test; the up processing module is used for transmitting the ATM cell which is transmitted by the ATM switching and processing module to an external interface; the down processing module is used for receiving the ATM cell of the external interface, which are processed by the ATM switching and processing module; the segmentation recombining and controlling module establishes data communication with the ATM switching and processing module, is used for packaging the data for the test into the ATM cell which accords with connection test parameters of the permanent virtual chain circuit, and tests the connection performance of the permanent virtual chain circuit by analyzing and processing the ATM cell. By using the present invention, the complexity of the function test of the permanent virtual chain circuit can be effectively simplified, the investment of devices of operators can be reduced, and the test efficiency can be largely improved.
Description
Technical Field
The invention relates to an improved packaging and checking method of ATM adaptation layer 5 cells, in particular to a device and a method for testing PVC connection performance across ATM equipment.
Background
The existing Digital Subscriber Line (DSL) technology, including Asymmetric Digital Subscriber Line (ADSL), g.shdsl and other DSLs, adopts Asynchronous Transfer Mode (ATM) based cell processing technology. The subscriber datagram is transmitted in the form of ATM cells over the subscriber line to a Digital Subscriber Line Access Multiplexer (DSLAM) device.
The DSLAM device does not terminate the accessed ATM cell, and after the ATM layer processes the ATM cell, the uplink ATM interface converges the Service, and then the Service passes through an ATM network of an MSTP (Multi-Service Transport Platform) device to a Broadband Access Server (BAS)) or a router. ATM cells terminate on BAS equipment or routers.
Because the device operator adopts different devices in the access layer and the convergence layer, after a Permanent virtual link (PVC) connection is established between a digital subscriber line access multiplexer (DSLARM) and a convergence layer MSTP device, and between the convergence layer MSTP device and a Broadband Access Server (BAS) device/router, there is no simple and effective way to test the state of the PVC connection, and the connection state test can be performed only through a user terminal device or a test instrument at present.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a device and a method for testing connection performance of a cross-ATM device, which are used to solve the problem that an operator cannot simply and effectively test the connection performance of a permanent virtual link when the devices adopted in an access layer and a convergence layer are different.
In order to achieve the above object, the present invention provides a connection performance testing apparatus across ATM devices, for testing connection performance of a permanent virtual link between a local device and a remote device, including:
an ATM switching processing module for receiving and transmitting test data and ATM cells;
an up service processing module, which is used to send the ATM cell transmitted by the ATM switching processing module to the external interface;
a downlink service processing module, which is used to receive the ATM cell of the external interface and send it to the ATM switching processing module for processing; and
and the segmented recombination control module establishes data communication with the ATM switching processing module, is used for encapsulating the data for testing into ATM cells which accord with the permanent virtual link connection testing parameters, and tests the connection performance of the permanent virtual link by analyzing and processing the ATM cells.
The device for testing the connection performance of the cross-ATM equipment comprises the following modules:
the preprocessing submodule is used for generating a data packet containing check bytes by the data for testing, extracting the check bytes to recover the test data, counting the bit error rate and storing a performance statistical result;
a common part convergence processing submodule connected with the preprocessing submodule and used for carrying out tail mark domain adding processing and cyclic redundancy check on the data packet; and
and the segmentation and recombination processing submodule is connected with the public part convergence processing submodule and is used for splitting and recombining the data packet and adding an ATM cell header to the split data packet to generate an ATM cell stream.
The device for testing the connection performance of the cross-ATM equipment further comprises a management module which is connected with the ATM switching processing module and is used for initializing the test data and providing test results and test connection information for users.
The device for testing the connection performance of the cross-ATM equipment is characterized in that the ATM switching processing module is in data communication with the uplink service processing module, the downlink service processing module and the segmented recombination control module through a UTOPIA II interface.
The device for testing the connection performance of the cross-ATM equipment comprises the following parameters: a virtual path identifier value, a virtual channel identifier value.
In order to achieve the above object, the present invention further provides a method for testing connection performance of a cross-ATM device, which is used for testing connection performance of a permanent virtual link between a local device and a remote device, and includes:
establishing and configuring a permanent virtual link bidirectional test channel between local equipment and remote equipment to realize service loopback from sending to receiving;
step two, packaging the data for testing into ATM cells according with the permanent virtual link connection testing parameters through the segment recombination control, and sending; and
and step three, receiving the ATM cell test data, carrying out ATM switching processing, carrying out verification and connection performance statistics of the received data through sectional recombination control.
The method for testing the connection performance of the cross-ATM equipment comprises the following steps:
a step of establishing permanent virtual link bidirectional connection between a segment recombination control port and an output port on local terminal equipment; and
a step of establishing a permanent virtual link bidirectional connection between an output port on the local device and the remote device.
The method for testing the connection performance of the cross-ATM equipment comprises the following steps:
step 810, firstly, recombining the data for testing into a 48-byte fixed-length data packet with check bytes;
step 820, add the tail label domain of the protocol data unit to the tail of the data packet;
step 830, by the segment recombination process, splitting the data into 48-byte data packets, adding ATM cell headers, generating ATM cell streams, and sending the ATM cell streams to the ATM switch processing module; and
step 840, the ATM switch processing module sends the ATM cell stream to the uplink service processing module according to the test setup parameters of the permanent virtual link connection, and then to the remote device.
The method for testing the connection performance of the cross-ATM equipment further comprises the step of setting the receiving time of the ATM cells, and is used for judging whether the received ATM cells are overtime or not, stopping receiving the ATM cells if the receiving time of the ATM cells is overtime, and continuing receiving the ATM cells if the receiving time of the ATM cells is not overtime.
The method for testing the connection performance of the cross-ATM equipment further comprises the step of judging whether test data is received after the ATM cell is stopped being received, and the step of judging whether to report the statistical performance or send a report alarm.
The invention can be used for carrying out functional test on the PVC connection without other equipment, can effectively simplify the complexity of PVC functional test, reduces the equipment investment of operators and greatly improves the test efficiency.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIG. 1 is a block diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a data unit encapsulation process according to the present invention;
FIG. 3 is a block diagram of an application network; and
fig. 4 is a business process diagram of the present invention.
Detailed Description
The invention aims to provide a method for pre-splitting test data into data blocks with one check byte before an ATM adaptation layer 5(AAL5) is adapted when a test data packet is encapsulated into an ATM cell in an ATM processing unit of MSTP equipment, a remote device executes PVC loopback operation, and the local device checks the data blocks and provides functions of alarming, performance statistics, such as error codes of PVC connection and the like. The invention provides a method and a device for realizing cross-manufacturer ATM connection performance test, which are characterized in that referring to the attached figure 1, the device at least comprises the following modules:
a management module 10, providing an initialization interface for initializing the processing data;
an ATM switching processing module 13, which is connected to the uplink/downlink service processing modules 11 And 12 And an SAR (Segmentation And reconstruction) control module 14, And provides an ATM connection processing interface for processing connection establishment And disconnection, connection bandwidth monitoring, And cell switching;
an uplink service processing module 11, which provides a data transmission interface, transmits the cell sent by the ATM switching processing module 13 to an external interface, and provides rate adaptation and cell scrambling;
a downlink service processing module 12, which provides a data receiving interface, and sends the cell to the ATM switch processing module 13 for processing after receiving the external ATM cell data;
and the SAR control module 14 is connected with the ATM switching processing module 13 and is divided into three sub-modules of preprocessing 141, CPCS processing 142 and SAR processing 143, wherein the SAR preprocessing sub-module 141 realizes the generation and extraction processing of check bytes and simultaneously completes the functions of performance statistics, data storage, flow control and the like.
The method comprises three parts of PVC access configuration, SAR uplink processing and SAR downlink processing.
Wherein, the PVC access configuration comprises the following steps:
(1) the PVC bidirectional connection from the local equipment to the remote equipment for testing is established, and corresponding flow parameters are set: the corresponding port of the local terminal/far-end equipment establishes corresponding PVC connection, and the far-end equipment realizes the PVC loopback function;
(2) establishing bidirectional connection from an SAR port of the segmental recombination control module to an output port for testing PVC on the local terminal equipment;
(3) and activating the SAR control module to perform performance test.
The uplink processing comprises the following steps:
(1) the preprocessing submodule of the SAR control module recombines the default set test data or the test data designated by the user into a 48-byte fixed-length data packet with check bytes, and then sends the data packet to a Common Part Convergence processing submodule of a Common Part Convergence Sublayer (CPCS) of the AAL5 for processing;
(2) the CPCS adds a PDU tail mark domain to the tail of the data sent by the upper-layer preprocessing submodule, and then sends the data to a subsection recombination processing submodule of a subsection recombination Sublayer (SAR);
(3) the segmentation and reassembly processing submodule of the segmentation and reassembly sublayer splits the received data into 48-byte data packets and then sends the data packets to the segmentation and reassembly processing submodule of the SAR control module;
(4) after a cell header is added to a segmentation and recombination processing submodule of the ATM processing layer, a data packet is sent to an ATM exchange processing module through a UTOPIA II interface according to a flow contract parameter set by the connection of the test PVC;
(5) and the ATM switching processing module sends the test data to a corresponding output port of the equipment according to the PVC configuration and sends the test data to the remote equipment.
Wherein, the downlink processing comprises the following steps:
(1) after receiving test data for testing PVC connection from a home terminal receiving port, the ATM switching processing module sends target data to the SAR control module according to PVC configuration;
(2) the segmented recombination processing submodule of the SAR control module, which receives the ATM layer, recovers ATM data from a receiving end, performs recombination, CPCS-PDU check and user data extraction, and sends the data to the preprocessing submodule of the upper layer;
(3) the preprocessing submodule on the upper layer recovers the test data stream after the check byte extraction calculation and the bit error performance statistics in the 48-byte data packet;
(4) and the home terminal verifies the correctness of the data receiving and sending, and realizes the statistics of the performance and the state of the connection.
The whole treatment process of the invention is as follows:
1) firstly, establishing local terminal equipment MSTP equipment to remote terminal equipment ATM equipment (such as: DSLAM/BAS device), specifically including:
1.1, establishing end-to-end PVC bidirectional connection between DSLAM equipment/BAS equipment and corresponding ports of MSTP equipment, and realizing PVC connection path of test data from MSTP equipment- > DSLAM/BAS equipment (receiving and sending loopback) - > MSTP equipment;
1.2, establishing PVC bidirectional connection from an SAR port of a segmental recombination control module to a test service output port on MSTP equipment;
1.3, activating an SAR control module;
1.4, data communication is realized between an ATM exchange processing module and an uplink/downlink service processing module of the MSTP equipment and between an SAR control module through a UTOPIA II interface;
2) the MSTP device test data sending process, referring to fig. 2, includes the following steps:
2.1, the SAR control module takes the designated user data or default configuration data as a data source;
2.2, the preprocessing submodule divides the data source into 47-byte sections in advance, performs BIP-8 even check calculation on 47-byte data of each section, and adds corresponding BIP-8 check bytes at the end of each section for bit error performance statistics during receiving. If the residual length of the tail part after segmentation is less than 47 bytes, adding no BIP-8 check byte;
2.3, sending the data preprocessed by the preprocessing submodule of the SAR port to the CPCS processing submodule to form CPCS-SDU;
2.4, adding a PAD (PAD area) field (0-47 bytes), a CPCS-UU field (1 byte), a CPI field (1 byte), a LENGTH field (2 bytes) and a CRC-32 field (4 bytes) at the tail of the received CPCS-SDU by the CPCS processing submodule to form a CPCS-PDU;
2.5, the SAR processing sub-module divides and splits the CSCS-PDU into SAR-PDU with the length of 48 bytes, and adds an ATM cell header to form a sending cell stream;
2.6, the added cell header in 2.5 is required to conform to VPI (Virtual Path Identifier) value and VCI (Virtual Channel Identifier) value of the tested PVC connection;
2.7, sending the test cell stream from the SAR port to the ATM switching processing module according to the QoS (Quality of Service) parameter set by the PVC connection test;
3) the MSTP device test data receiving process, referring to fig. 2, includes the following processing steps:
3.1, receiving the cell looped back from the remote equipment and sent into the SAR control module from the ATM switching processing module;
3.2, extracting SAR-SDU from the receiving cell, and recombining the data into CPCS-PDU by an SAR processing submodule;
3.3, the CPCS-PDU processing submodule carries out CRC-4 verification on the CPCS-PDU, analyzes PAD, CPCS-UU, CPI, LENGTH and CRC-32 domains at the tail part of the CPCS-PDU message and extracts CPCS-SDU;
3.4, the preprocessing submodule carries out BIP-8 even check on the CPCS-SDU according to the length segment of 48 bytes, and a test data unit is recovered; and (5) counting the bit error rate and storing the performance counting result. If no cell is received within the set receiving time, generating a connection abnormity alarm;
wherein,
CPCS-PDU: payload field, 0-65535 bytes.
PAD domain: and a padding field with 0-47 bytes, which is used for enabling the length of the CPCS-PDU to be an integral multiple of 48 bytes, and the CPCS-PDU can be just placed into the AATM cell.
CPCS-UU: the user-user indication field, which is originally used for transparently transferring CPCS user-user information. In the PPPOAAL5 encapsulation, this field is not functional and can be set to an arbitrary value, 1 byte.
CPI: the common part indication field, whose basic purpose is to fill the CPCS-PDU tail to a length of exactly 64 bits, is encoded with 0x 00.
LENGTH: a length field for indicating the byte length of the payload field, the maximum value of which is 65535 bytes. When this field is encoded as 0x00, it is used to indicate that the receive drop performs a discard function.
CRC: CRC cyclic check is performed on the CPCS-PDU.
4) The downlink service processing module completes the data receiving and sending between the user port and the ATM switching processing module and the corresponding processing function of a TC (Transmission Convergence) layer;
5) and the management module provides the received test data, performance, connection state statistics and other test connection state reports for the user through a related command interface.
Fig. 3 is a diagram showing a structure of an application network, the network structure including: user PC, ADSL Modem (MORDEN), DSLAM equipment, BAS equipment/router and MSTP transmission network, wherein the DSLAM equipment has ATM interface; PVC connections are established between the DSLAM equipment and the MSTP transport network, and between the MSTP transport network and the BAS equipment/router.
Fig. 4 is a business flow chart of the present invention, which includes: step 401, firstly, initializing a system; step 402, establishing PVC bidirectional connection from an SAR port of an SAR control module of local equipment to an output port; step 403, establishing a PVC bidirectional connection between the output port of the local device and the remote device, and implementing a service loopback from sending to receiving; step 404, selecting test data and activating an SAR control module; step 405, the SAR control module sends test data; step 406, receiving the start; step 407, determining whether the reception is overtime, if not, executing step 408, and if so, executing step 410; step 408, the SAR control module receives the return data; step 409, the SAR control module verifies the received data and carries out bit error performance statistics; step 410, receiving is closed, and data receiving is stopped; step 411, determining whether test data is received, if yes, executing step 412, and if no, executing step 413; step 412, reporting the statistical performance; and step 413, reporting an alarm.
The invention has the following functions and effects:
the problem of functionality test of PVC connection established between ATM equipment at two ends of cross-manufacturer or cross-network management layer in the prior art is solved. The method can monitor the VP connection alarm state of a VP (Virtual Path) channel of a test link, count the code error block, block error rate, cell loss rate and the like of VP connection, provide a function of comparing test data sent by a user with received test data, and partially replace a data tester.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A cross-ATM equipment connection performance testing device for testing the connection performance of a permanent virtual link between a local device and a remote device, comprising:
an ATM switching processing module for receiving and transmitting test data and ATM cells;
an up service processing module, which is used to send the ATM cell transmitted by the ATM switching processing module to the external interface;
a downlink service processing module, which is used to receive the ATM cell of the external interface and send it to the ATM switching processing module for processing; and
a segment recombination control module, which establishes data communication with the ATM switching processing module, and is used for encapsulating the data for testing into ATM cells meeting permanent virtual link connection testing parameters, and testing the connection performance of the permanent virtual link by analyzing and processing the ATM cells;
the subsection reorganization control module is characterized by further comprising:
the preprocessing submodule is used for generating a data packet containing check bytes by the data for testing, extracting the check bytes to recover the test data, counting the bit error rate and storing a performance statistical result;
a common part convergence processing submodule connected with the preprocessing submodule and used for carrying out tail label domain adding processing and cyclic redundancy check on the data packet; and
and the segmentation and recombination processing submodule is connected with the public part convergence processing submodule and is used for splitting and recombining the data packet and adding an ATM cell header to the split data packet to generate an ATM cell stream.
2. The apparatus for testing connection performance across ATM devices of claim 1, further comprising a management module, coupled to the ATM switch processing module, for initializing the test data, providing test results and test connection information to a user.
3. The apparatus for testing connection performance across ATM devices according to claim 1 or 2, wherein the ATM switching processing module performs data communication with the upstream traffic processing module, the downstream traffic processing module, and the segment reassembly control module through a UTOPIA II interface.
4. An apparatus for testing connection performance across ATM devices according to claim 1, wherein the connection test parameters include: a virtual path identifier value, a virtual channel identifier value.
5. A method for testing the connection performance of a cross-ATM device is used for testing the connection performance of a permanent virtual link between a local device and a remote device test, and comprises the following steps:
step one, establishing and configuring a permanent virtual link bidirectional test channel between local equipment and remote equipment to realize service loopback from sending to receiving;
step two, packaging the data for testing into ATM cells which accord with the permanent virtual link connection testing parameters through the segment recombination control, and sending; and
step three, receiving the ATM cell test data, carrying out ATM switching processing, carrying out verification and connection performance statistics of the received data through sectional recombination control;
characterized in that, the second step further comprises:
firstly, recombining the data for testing into a 48-byte fixed-length data packet with check bytes;
secondly, adding a tail label domain of a protocol data unit to the tail of the data packet;
step two, through the segmental recombination processing, the data is divided into 48-byte data packets, ATM cell headers are added, an ATM cell stream is generated, and the ATM cell stream is sent to an ATM switching processing module; and
step two, the ATM exchange processing module sends the ATM cell stream to the uplink service processing module according to the test setting parameter of the permanent virtual link connection, and then sends the ATM cell stream to the remote device.
6. The method for testing connection performance across ATM devices of claim 5, wherein the step one further comprises:
a step of establishing permanent virtual link bidirectional connection between a segment recombination control port and an output port on local terminal equipment; and
a step of establishing a permanent virtual link bidirectional connection between an output port on the local device and the remote device.
7. The method according to claim 5, wherein the third step further comprises a step of setting an ATM cell receiving time for determining whether the received ATM cell is overtime, if yes, stopping receiving the ATM cell, and if no, continuing receiving the ATM cell.
8. The method according to claim 7, wherein the third step further comprises a step of determining whether test data is received after stopping receiving the ATM cell, for determining whether to report statistical performance or issue a report alarm.
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| CN102684948A (en) * | 2012-05-29 | 2012-09-19 | 合肥华云通信技术有限公司 | Serpentine-flow-based network port testing method |
| CN102868646B (en) * | 2012-08-24 | 2015-06-17 | 北京星网锐捷网络技术有限公司 | Asynchronous transfer mode (ATM) logic design simulation method, and platform, and equipment |
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