Multi-rate, multi-protocol, multi-port line interface for a multiservice switching platform

• US 20040258058A1
• Filed: 06/19/2003
• Published: 12/23/2004
• Est. Priority Date: 06/19/2003
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Heston, Matthew L., Nehib, Gregory S.
• Granted Patent: US 6,956,847 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04J 2203/0025 Peripheral units
• CPC Class Codes: H04J 2203/0085 Support of Ethernet
• CPC Class Codes: H04J 2203/0094 Virtual Concatenation
• CPC Class Codes: H04J 2203/0096 Serial Concatenation
• CPC Class Codes: H04J 3/1611 Synchronous digital hierarchy [SDH] or SONET H04J3/1664 takes precedence for interactions with OTN
• CPC Class Codes: H04J 3/1664 carrying hybrid payloads, e.g. different types of packets or carrying frames and packets in the paylaod
• CPC Class Codes: H04L 49/357 Fibre channel switches

Abstract

Methods and apparatus for enabling a line card to support multiple ports, multiple rates, and multiple protocols within an optical network system are disclosed. According to one aspect of the present invention, a line card that is suitable for incorporation into one of a multi-slot broadband digital cross-connect system or a multiservice provisioning platform includes a first port and a plurality of devices. The first port is arranged to be provisioned to accept an input signal which may be one of a signal of a first protocol and a signal of a second protocol. The plurality of devices being arranged to process the input signal to create an output signal which has a SONET payload. In one embodiment, the signal of the first protocol is an OC-n signal and the signal of the second protocol is a Gigabit Ethernet signal.

Claims

1. A line card, the line card being arranged to be incorporated into one of a multi-slot broadband digital cross-connect system or a multiservice provisioning platform, the line card comprising:

a first port, the first port being arranged to be provisioned to accept an input signal, wherein the input signal is one of a signal of a first protocol and a signal of a second protocol; and

a plurality of devices, the plurality of devices being arranged to process the input signal to create an output signal which has a SONET payload, wherein the plurality of devices are configured to process the signal of the first protocol and the signal of the second protocol.

2. The line card of claim 1 wherein the signal of the first protocol is an OC-n signal and the signal of the second protocol is a Gigabit Ethernet signal.

3. The line card of claim 2 wherein the OC-n signal is one of an OC-3 signal, an OC-12 signal, and an OC-48 signal.

4. The line card of claim 2 wherein the output signal is an STS-n signal.

5. The line card of claim 4 wherein the output signal is an STS-48 signal which includes approximately 48 STS-1 frames.

6. The line card of claim 1 wherein the plurality of devices includes:

a first device which is arranged to accept the input signal in a serialized format and to process the input signal when the input signal is the signal of the first protocol;

a second device which includes section and line termination functionality used in the creation of the output signal;

a third device, the second device being arranged to map the input signal to create the output signal when the signal is of the second protocol; and

a switch, the switch being arranged to receive the signal serially from the multi-first device and to provide the signal to one of the second device and the third device, wherein when the switch provides the signal to the third device, the third device returns the mapped signal to the switch which then passes the mapped signal to the second device.

7. A line card, the line card being arranged to be incorporated into one of a multi-slot broadband digital cross-connect system or a multiservice provisioning platform, the line card comprising:

a plurality of ports, the plurality of ports including a first port, the first port being arranged to receive a signal, the signal being one of an OC-3 signal, an OC-12 signal, an OC-48 signal, and a Gigabit Ethernet signal;

a plurality of devices, the plurality of devices being arranged to receive the signal and to process the signal to create an STS-48 SONET signal; and

a backplane, the backplane being arranged to receive the STS-48 SONET signal from the plurality of devices.

8. The line card of claim 7 wherein the plurality of devices includes:

a multi-rate serialize-deserialize device which is arranged to accept the signal in a serialized format;

a first device which includes section and line termination functionality in the creation of the STS-48 SONET signal;

a second device, the second device being arranged to map the Gigabit Ethernet signal to create a mapped signal with a SONET payload; and

a switch, the switch being arranged to receive the signal serially from the multi-rate serialize-deserialize device and to provide the signal to one of the first device and the second device, wherein when the switch provides the signal to the second device, the second device returns the mapped signal to the switch which passes the mapped signal to the first device.

9. The line card of claim 8 wherein the multi-rate serialize-deserialize device is further arranged to perform a mapping on the OC-3 signal and the OC-12 signal, and to substantially allow the OC-48 signal and the Gigabit Ethernet signal to pass through.

10. The line card of claim 7 wherein when the signal is the OC-3 signal, the STS-48 SONET signal includes approximately three STS-1 channels with data associated with the OC-3 signal and approximately 45 STS-1 channels without data associated with the OC-3 signal.

11. The line card of claim 7 wherein when the signal is the OC-12 signal, the STS-48 SONET signal includes approximately 12 STS-1 channels with data associated with the OC-12 signal and approximately 36 STS-1 channels without data associated with the OC-12 signal.

12. The line card of claim 7 wherein when the signal is the OC-48 signal, the STS-48 SONET signal includes approximately 48 STS-1 channels with data associated with the OC-48 signal.

13. A line card, the line card being arranged to be included in a system on a network, the line card comprising:

at least one port arranged to receive a signal of a first format;

a first module, the first module being arranged to receive the signal of the first format serially from the port, the first module further being arranged to determine when the first format is of a desired format, wherein when it is determined that the first format is not the desired format, the first module is still further arranged to determine when to map the signal of the first format into a signal of the desired format using the first module and to map the signal of the first format into the desired format using the first module when it is determined that the signal of the first format is to be mapped into the signal of the desired format using the first module; and

a second module, the second module being arranged to receive the signal of the first format serially from the first module when it is determined that the signal is not to be mapped into the signal of the second format using the first module, the second module further being arranged to receive the signal of the first format serially from the first module when it is determined that the first format is the desired format, the second module further being arranged to receive the signal of the desired format serially from the first module when the signal of the first format is mapped into the signal of the desired format using the first module, wherein the second module is still further arranged to determine when to map the signal of the first format into the signal of the desired format using the second module and to map the signal of the first format into the signal of the desired format using the second module when it is determined that the signal of the first format is to be mapped into the signal of the desired format using the second module.

14. The line card of claim 13 further including:

a third module, the third module being arranged to receive the signal of the desired format from the second module, the third module further being arranged to perform section and line termination on the signal of the desired format and to pass a resultant signal out of the line card.

15. The line card of claim 14 wherein the first format is one of an OC-3 format, an OC-12 format, an OC-48 format, and a Gigabit Ethernet format, the desired format is the OC-48 format, and the resultant signal is an STS-48 SONET signal.

16. The line card of claim 13 wherein the first module includes clock and data recovery functionality.

17. The line card of claim 15 wherein the first format is an OC-3 format and the desired format is an OC-48 format, and wherein the first module is arranged to map the signal of the OC-3 format into the signal of the OC-48 format.

18. The line card of claim 15 wherein the first format is an OC-12 format and the desired format is an OC-48 format, and wherein the first module is arranged to map the signal of the OC-12 format into the signal of the OC-48 format.

19. The line card of claim 13 wherein the first format is a Gigabit Ethernet format and the desired format is an OC-48 format, and wherein the second module is arranged to map the signal of the Gigabit Ethernet format into the signal of the OC-48 format.

20. The line card of claim 13 wherein the first format is one of an OC-3 format, an OC-12 format, an OC-48 format, and a Gigabit Ethernet format.

21. A method for processing a first signal received on a line card, the line card being arranged to be a part of a system within a network, the method comprising:

receiving the first signal on a first port of the line card;

determining when the first signal is of a first format;

performing section and line termination on the first signal when it is determined that the first signal is of the first format;

determining when the first signal is of a second format;

creating a signal of a fourth format from the first signal of the second format when it is determined that the first signal is of the second format;

determining when the first signal is of the third format; and

creating the signal of the fourth format from the first signal of the third format when it is determined that the first signal is of the third format.

22. The method of claim 21 wherein creating the signal of the fourth format from the first signal of the second format includes performing framing on the first signal when it is determined that the first signal is of the second format, mapping the framed signal into the fourth format, and performing section and line termination on the mapped framed signal.

23. The method of claim 21 wherein creating the signal of the fourth format from the first signal of the third format includes mapping the first signal into a fifth format, mapping the signal of the fifth format into the fourth format, and performing section and line termination on the mapped signal.

24. The method of claim 21 wherein the first format is an OC-48 format, the second format is one of an OC-3 format and an OC-12 format, and the third format is a Gigabit Ethernet format.

25. The method of claim 24 wherein the fourth format is an STS-48 SONET format.