Dynamic bandwidth management using signaling protocol and virtual concatenation
AssigneeTellabs Operations, Inc.
InventorsSrinivas V. Makam, Gary L. Davis, Corey M. Parollina, Dmitry Levandovsky
Life of this patent
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Abstract
A communication system (10) employs switching circuits, such as an add/drop multiplexer (70) and another add/drop multiplexer (110). The bandwidth of a circuit switched connection between the switching circuits is altered without taking down the connection.
Claims26
In a communication system, apparatus for changing the bandwidth of a circuit switched connection without taking down the connection comprising:
- a network management system arranged to issue a connection create request effective during a first time period and a connection modify command effective during a second time period;
- a first switching circuit comprising a first interface and a second interface, the first switching circuit being arranged to
- receive data at the first interface,
- be responsive to the connection create request during the first time period to reserve first resources at a first bandwidth for transmitting the data between the first and second interfaces at the first bandwidth and to launch a first path setup message using a signaling protocol, and
- be responsive to the modify command during the second time period to reserve virtually concatenated second resources at a second bandwidth greater than the first bandwidth for transmitting the data between the first and second interfaces at the second bandwidth and to launch a second path setup message using the signaling protocol;
- a second switching circuit comprising a third interface and a fourth interface, the second switching circuit being arranged to
- receive the data at the third interface,
- be responsive to the first path setup message during the first time period to reserve third resources at the first bandwidth for transmitting the data between the third and fourth interfaces at the first bandwidth, and
- be responsive to the second path setup message during the second time period to reserve virtually concatenated fourth resources at the second bandwidth for transmitting the data between the first and second interfaces at the second bandwidth;
- and
- at least one network coupling the network management system, first switching circuit and second switching circuit.
In a data communication system comprising a first switching circuit and also comprising a second switching circuit, a method for changing the bandwidth of a circuit switched connection between the first and second switching circuits without taking down the connection comprising:
- issuing a connection create request effective during a first time period and a connection modify command effective during a second time period;
- responding to the connection create request during the first time period to reserve first resources at a first bandwidth for transmitting the data across the first switching circuit at the first bandwidth and to launch a first path setup message using a signaling protocol;
- responding to the connection modify command during the second time period to reserve virtually concatenated second resources at a second bandwidth greater than the first bandwidth for transmitting the data across the first switching circuit at the second bandwidth and to launch a second path setup message using the signaling protocol;
- responding to the first path setup message during the first time period to reserve third resources at the first bandwidth for transmitting the data across the second switching circuit at the first bandwidth;
- responding to the second path setup message during the second time period to reserve virtually concatenated fourth resources at the second bandwidth for transmitting the data across the second switching circuit at the second bandwidth;
- and
- coupling the first and second switching circuits.
Dependencies are inferred from the claim text.