Communications switching architecture
View Patent ↗Presently described is a system and method for switching multimedia data communications, including but not limited to Voice over IP (VoIP) telephony, cable TV, digital audio and video. The system utilizes a single, integrated device to provide all PacketCable-compliant functionality, including enhanced user privacy, compliance with CALEA, E911 and other mandated services not available in conventional distributed PacketCable systems. High speed and efficient, low cost operation are provided by means of an optimized data unit encapsulation scheme for internal switching and routing. A proprietary fiber optic backplane and removable optical connectors are used to enable lightspeed internal communications hot-swapping of components. Furthermore, the present system is extensible to all forms of digital data switching and is secure, resistant to Denial of Service attacks, and fault-resilient.
1. A method of media data switching, comprising:
receiving a plurality of media data units at an ingress port of a packet switch, wherein said ingress port of the packet switch is capable of supporting a combination of traffic types including packet type traffic and Time Division Multiplexing (TDM) type traffic;
determining a corresponding egress port of the packet switch for each of said plurality of media data units based on the routing information corresponding to each of said plurality of media data units;
at the ingress port, directing each said plurality of media data units toward said corresponding egress port, wherein said directing includes reformatting media data units of multiple TDM circuits destined for the same egress port of the packet switch into a fixed size data unit (FSDU), adding a header to the FSDU to create an encapsulated packet, and directing each said encapsulated packet toward said corresponding egress port;
at each said egress port, receiving and reformatting said encapsulated packets into a second plurality of media data units; and
transmitting said second plurality of media data units to complete said media data switching.
2. The method of claim 1 , wherein at said egress port of the packet switch, said reformatting comprises:
removing said header from said encapsulated packet; and
extracting said second plurality of media data units.
3. The method of claim 1 , wherein said directing each said encapsulated packet toward said corresponding egress port occurs by an end of a time frame.
4. The method of claim 3 , wherein said directing each said encapsulated packet toward said corresponding egress port when each of said encapsulated packet are filled.
5. The method of claim 1 , wherein said media data units comprise one of audio data; video data; and television signals in digital form.
6. The method of claim 1 , wherein said determining further comprises securely processing said media data units.
7. The method of claim 6 , wherein said securely processing further comprises concealing the IP addresses of the transmitting party from the receiving party and concealing the IP addresses of the receiving party from the transmitting party.
8. The method of claim 6 , wherein said securely processing further comprises providing CALEA services undetectable to either the transmitting or receiving parties.
9. The method of claim 1 , wherein said determining comprises accessing routing information corresponding to each of said plurality of media data units.
10. The method of claim 1 , wherein said determining further comprises queuing said media data units using high-granularity, class-based queues to provide protection from Denial of Service attacks.
11. The method of claim 10 , wherein said queuing employs a plurality of queues for each class of service.
12. The method of claim 1 , wherein said directing occurs in real-time.
13. The method of claim 1 , further comprising controlling said media data switching through a single element management system.
14. An apparatus for integrated media switching comprising:
a plurality of ingress ports of a packet switch each receiving a plurality of media data units;
a processor coupled to the ingress ports, comprising
means for determining a corresponding egress port of the packet switch for each of said plurality of media data units based on the routing information corresponding to each of said media data units;
means for directing each said plurality of media data units toward said corresponding egress port, wherein directing includes reformatting media data units of multiple TDM circuits destined for the same egress port of the packet switch into a fixed size data unit (FSDU), adding a header to the FSDU to create an encapsulated packet, and
means for directing each said encapsulated packet toward said corresponding egress port;
a plurality of egress ports, comprising means for receiving and reformatting said encapsulated packets into a second plurality of media data units, wherein at least one of said ingress ports of the packet switch is capable of supporting a combination of traffic types including packet type traffic and TDM type traffic; and
means for transmitting said second plurality of media data units to complete said media switching.
15. The apparatus of claim 14 , wherein said ingress ports, said processor, said egress ports, and said backplane are provided in a single chassis.
16. The apparatus of claim 14 , wherein said processor further comprises high-granularity, class-based queues of said media data units constituted to provide protection from Denial of Service attacks.
17. The apparatus of claim 14 , wherein said ingress ports, said processor, said egress ports, and said backplane are controlled though a single element management system.