Method and apparatus providing multi-service connections within a data communications device

• US 7,310,338 B1
• Filed: 11/14/2003
• Issued: 12/18/2007
• Est. Priority Date: 01/08/1999
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Foltan, Andrew S., Bahr, Raymond G.
• Primary Examiner(s): Sam; Phirin
• Application Number:
  US10/713,388
• Time in Patent Office: 1,495 Days
• Field of Search: 370/389, 370/351, 370/352, 370/353, 370/354, 370/386, 370/312, 370/395.42, 370/395.43, 370/465, 370/466, 370/469, 370/356, 370/392, 370/395.21, 370/395.31, 370/395.61, 370/412, 370/413, 370/415, 370/417, 370/419, 370/420, 370/421, 370/422, 370/467, 370/474, 709/203, 709/223, 709/229
• US Class Current: 370/392
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

A method and apparatus provide a data communication device that can process a number of streams of data according to a plurality of services. A host device such as a network access server which may include a router and a number of carrier cards hosts a number of modules. The host and modules are equipped with a messaging application programming interface (API). The API allows the host to discover what services are offered by the modules, and allows the host and modules to form an optimal interface configuration that most effectively handles data connections of different service types, such as voice, data, facsimile, video and so forth. In operation, each module is presented with a stream of data containing multiplexed calls. Each call contains data that is best operated on by one of the particular services. The messaging API allows the host to setup and control the module and sessions of the services offered by the modules depending upon the data types of the connections. Since the modules each offer a variety of services, a stream containing data one or more connections such as voice data, video data, modem data, facsimile data and so forth can be processed by a single module under control of the host.

Claims

1. A module providing data communications services, the module comprising:

an interface transferring a plurality of streams of data into and out of the module;

a plurality of service processing elements coupled to the interface, the plurality of service processing elements supporting a plurality of data communications services which operate on the streams of data being accepted through the interface; and

a memory that includes;

an identity table created upon start-up of the module, the identity table containing information identifying each of the plurality of services supported by the module;

a host configuration table created upon start-up of the module, the host configuration table identifying a configuration of a host that is hosting the module.

2. The module of claim 1 wherein the memory includes a plurality of data queues, each data queue buffering incoming and outgoing streams of packet data;

wherein the interface includes at least one connection capable of transferring incoming and outgoing streams of multiplexed data;

wherein the plurality of service processing elements accepts and processes the at least one connection including the incoming streams of multiplexed data according to one of the plurality of services, thus converting the incoming streams of multiplexed data to outgoing streams of packet data; and

wherein the plurality of service processing elements accepts and processes incoming streams of packet data according to one of the plurality of services, thus converting the incoming streams of packet data to outgoing streams of multiplexed data.

3. The module of claim 1 wherein a first one of the plurality of services offered by the plurality of service processing elements is one of a fax service, a voice service, a modem service, a video service, or a data service and a second one of the plurality of services offered by the plurality of service processing elements is one of a fax service, a voice service, a modem service, a video service or a data service.

4. The module of claim 1 further comprising a processor coupled to the interface and the plural service processing elements, wherein the memory includes:

a downloaded module image which executes on the processor and reads the host configuration table to determine the configuration of the host that is hosting the module and creates information identifying each of the plurality of services supported by the module and places the information identifying each of the plurality of services in the identity table allowing the host that is hosting the module to read the identity table to determine the plurality of services are offered by the module.

5. The module of claim 1 wherein the host configuration table and the identity table are expandable to define configuration parameters associated with additional services by the addition of fields to the host configuration table and the identity table, such that additional services defined do not adversely effect pre-existing services.

6. A module providing data communications services, the module comprising:

an interface transferring a plurality of streams of data into and out of the module;

a plurality of service processing elements coupled to the interface, the plurality of service processing elements supporting a plurality of data communications services which operate on the streams of data being accepted through the interface;

a processor coupled to the interface and the plural service processing elements;

a session manager process executing on the processor, the session manager process accepting session commands on the interface to control the service processing elements supporting the plurality of services; and

a module manager process executing on the processor, the module manager process accepting module commands on the interface to control the operation of the module.

7. The module of claim 6 wherein:

the memory includes a control queue and a status queue which are separate from the data queues, and wherein at least one of the control queue and the status queue receives the session commands and module commands over the interface from a host hosting the module so that the host can control operation of the module.

8. A method of configuring a host to interoperate with a module to which it is coupled, the method comprising:

providing, from the host to the module, information concerning mechanisms offered on the host to support services offered by the module;

providing, from the module to the host, information concerning which of a plurality of services are to be offered by the module; and

configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to streams of data passing through a data communications device;

wherein providing, from the host to the module, information concerning mechanisms offered on the host to support services offered by the module includes;

downloading an executable image accessible to the module from the host, the executable image executing on the module;

writing a host configuration table accessible to the module from the host, the host configuration table indicating to the module the mechanisms offered on the host to support services offered by the module.

9. The method of claim 8, wherein providing, from the module to the host, information concerning which of a plurality of services are to be offered by the module includes:

executing the executable image on the module to read the information from the host configuration table to determine the mechanisms offered on the host to support services offered by the module;

writing a module identity table accessible to the host from the module, the module identity table indicating information concerning services offered by the module.

10. The method of claim 9, further including indicating how many sessions can be supported for each service by the module.

11. The method of claim 9, wherein configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to connections passing through the data communication device includes:

reading, from the host, the module identity table to determine which services are offered by the module for data to be transferred through the host and module;

establishing appropriate queues accessible by the module and the host which allow data to be buffered between the host and the module as the data is processed by at least one of the plurality of services offered by the module.

12. A method of configuring a host to interoperate with a module to which it is coupled, the method comprising:

providing, from the host to the module, information concerning mechanisms offered on the host to support services offered by the module;

providing, from the module to the host, information concerning which of a plurality of services are to be offered by the module; and

configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to streams of data passing trough a data communications device;

wherein configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to connections passing through the data communication device includes;

sending module command messages from the host to the module to manage the configuration of the module;

returning, from the module to the host, module response messages sent in response to specific module command messages, the module response messages indicating the status of module configuration processing performed by the module command message in the module.

13. The method of claim 12, further including:

providing a plurality of service message catalogs containing messages related to particular services offered by the module;

at the host, selecting and sending particular messages selected from a service message catalog associated with a service to the module to establish, control and configure the service within the module.

14. The method of claim 13, wherein the plurality of service message catalogs include a digital data message catalog a data/fax/modem message catalog, an in-band signaling catalog, and a packet gateway service catalog.

15. A method of configuring a host to interoperate with a module to which it is coupled, the method comprising:

providing, from the host to the module, information concerning mechanisms offered on the host to support services offered by the module;

providing, from the module to the host, information concerning which of a plurality of services are to be offered by the module; and

configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to streams of data passing through a data communications device;

wherein configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to connections passing through the data communication device includes;

providing a distinct service message catalog for each of the plurality of services;

detecting a connection associated with a service;

selecting messages from the service message catalog and sending the messages from the host to the module in order to establish a session of a service for the connection.

16. A method for processing streams of data in a data communications device, the method comprising:

accepting a stream of data on an interface, the stream of data including multiplexed connections, each connection having an associated data type;

directing the stream of data to a module offering a plurality of services, wherein each service is associated with an associated data type;

processing each connection by a service on the module having an associated data type that is compatible with a data type associated with the connection;

wherein directing the stream of data includes;

assigning a data queue to each connection in the stream of data;

providing a session command message to the module to instruct the module to setup and establish a session associated with each connection;

providing a session response message from the module to the host to indicate the successful execution of the session command message.

17. A method for processing steams of data in a data communications device, the method comprising:

accepting a stream of data on an interface, the stream of data including multiplexed connections, each connection having an associated data type;

directing the stream of data to a module offering a plurality of services, wherein each service is associated with an associated data type;

processing each connection by a service on the module having an associated data type that is compatible with a data type associated with the connection;

wherein processing each connection by a service on the module includes;

providing a service command message to the module to instruct the module to setup and establish a service associated with each connection;

providing a service response message from the module to the host to indicate the successful execution of the session command message.

18. A multiple-service module comprising:

a module interface capable of being coupled to a host;

a plurality of service interfaces capable of providing connections according to at least one of a plurality of services offered by the multiple-service module;

a memory unit;

a service module processing unit;

a service module bus coupling the module interface, the plurality of services interfaces, the processing unit and the memory unit;

the service module processing unit providing information upon request to a multiple service carrier card regarding the services offered by the multiple-service module and providing connection processing to support multiple simultaneous data communication sessions between the plurality of services interfaces and the module interface, each data communication session configured according one of the services offered by the multiple-service module.

19. An access server comprising:

a host processing unit;

a memory unit;

a host interface;

a bus coupling the host processing unit and the memory unit and the host interface;

the host processing unit detecting insertion of a multiple-service module into the host interface and interrogating the multiple-service module to determine what services are offered by the multiple-service module, and configuring a service configuration in the memory unit for each service offered, so as to allow the host processing to interoperate with the inserted multiple-service module to provide at least one data communications session over the bus according one of the services offered by the multiple-service module.

20. The access server of claim 19, further comprising:

a plurality of service message catalogs, one per service offered by the module, each service message catalog containing messages related to particular services offered by the module; and

wherein the host processing unit selects and sends particular messages selected from a service message catalog associated with a service to the module to establish, control and configure the service within the module to process the at least one data communications session.

21. A method providing an application programming interface allowing configuration of a plurality of data communications services between two data communication devices, the method comprising:

downloading code from a carrier card into a module card;

executing the code in the module card to determine the services offered by the module card;

returning a list of services offered by the module card to the carrier card;

configuring, in the carrier card and in the module card, a service configuration for each service listed as being offered by the module card;

accepting and supporting a connection for at least one service for which there exists a service configuration.

22. A method of configuring a host to interoperate with a module to which it is coupled, the method comprising:

sending to the module information concerning mechanisms offered on the host to support services offered by the module;

receiving from the module information concerning which of a plurality of services are to be offered by the module; and

configuring mechanisms in the host so that the host can control the module to offer the plurality of services to streams of data passing through a data communications device;

wherein configuring mechanisms in the host includes;

sending module command messages to the module to manage the configuration of the module;

receiving module response messages from the module sent in response to specific module command messages, the module response messages indicating the status of module configuration processing performed by the module command message in the module.

23. The method of claim 22, wherein providing to the module information concerning mechanisms offered on the host to support services offered by the module includes:

writing a host configuration table accessible to the module from the host, the host configuration table indicating to the module the mechanisms offered on the host to support services offered by the module.

24. A method allowing configuration on of a plurality of data communications services at a module card, the method comprising:

downloading code from a carrier card;

executing the code in the module card to determine the services offered by the module card;

returning a list of services offered by the module card to the carrier card;

configuring in the module card, a service configuration for each service listed as being offered by the module card;

accepting and supporting a connection for at least one service for which there exists a service configuration.

25. A computer program product comprising a computer usable medium having computer program instructions thereon, which when executed by one or more processors, cause the one or more processors to perform the method of:

providing from a host to a module, information concerning mechanisms offered on the host to support services offered by the module;

providing from the module to the host, information concerning which of a plurality of services are to be offered by the module;

configuring mechanisms in the host and the module so that the host can control the module to offer the plurality of services to streams of data passing through a data communications device;

wherein configuring mechanisms in the host includes;

sending module command messages to the module to manage the configuration of the module;

receiving module response messages from the module sent in response to specific module command messages, the module response messages indicating the status of module configuration processing performed by the module command message in the module.

26. A data communication system comprising:

a shared memory;

a multiple-service module comprising;

a module interface;

a plurality of service interfaces capable of providing connections according to at least one of a plurality of services offered by the multiple-service module;

a service module processing unit;

a service module bus coupling the module interface, the plurality of services interfaces and the processing unit;

a host comprising;

a host processing unit;

a host interface;

a bus coupling the host processing unit and the host interface;

the host processing unit detecting insertion of the multiple-service module into the host interface and interrogating the multiple-service module to determine what services are offered by the multiple-service module, and configuring a service configuration in the shared memory for each service offered;

the service module processing unit providing information upon request to the host regarding the services offered by the multiple-service module and providing connection processing to support multiple simultaneous data communication sessions between the plurality of services interfaces and the module interface, each data communication session configured according one of the services offered by the multiple-service module.

27. The system of claim 26, further comprising:

a plurality of service message catalogs, one per service offered by the multiple-service module, each service message catalog containing messages related to particular services offered by the module; and

wherein the host processing unit selects and send particular messages selected from a service message catalog associated with a service to the module to establish, control and configure the service within the module to process the at least one data communications session.

28. A system providing data communications services, the system comprising:

a module including;

a plurality of service processing elements supporting a plurality of services which operate an streams of data being accepted through the module; and

a processor coupled to the plurality of service processing elements, the processor processing the plurality of services on the streams of data;

a host for hosting the module; and

a memory including;

an identity table created upon start-up of the module, the identity table containing information identifying each of the plurality of services supported by the module;

a host configuration table created upon start-up of the module, the host configuration table identifying a configuration of the host.