Flexible cross-connect with data plane

• US 6,587,470 B1
• Filed: 03/22/1999
• Issued: 07/01/2003
• Est. Priority Date: 03/22/1999
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Bhadare, Ajaib S., Shaffer, Dyke T., Elliot, Paul M.
• Primary Examiner(s): Rao, Seema S.
• Assistant Examiner(s): Duong, Frank
• Application Number:
  US09/274,078
• Time in Patent Office: 1,562 Days
• Field of Search: 370/218, 370/221, 370/225, 370/388, 370/401, 370/404, 370/405, 370/465, 370/466, 370/539, 370/907, 370/380, 370/386, 370/384, 370/425, 359/109, 359/115, 359/117, 340/2.2, 340/2.28
• US Class Current: 370/404
• CPC Class Codes: H04J 2203/0025 Peripheral units
• CPC Class Codes: H04J 2203/0026 Physical details
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04J 3/1611 Synchronous digital hierarchy [SDH] or SONET H04J3/1664 takes precedence for interactions with OTN
• CPC Class Codes: H04L 49/10 characterised by the switching fabric construction
• CPC Class Codes: H04L 49/15 Interconnection of switching modules
• CPC Class Codes: H04L 49/1523 Parallel switch fabric planes
• CPC Class Codes: H04L 49/254 Centralised controller, i.e. arbitration or scheduling
• CPC Class Codes: H04L 49/40 Constructional details, e.g. power supply, mechanical construction or backplane
• CPC Class Codes: H04L 49/552 by ensuring the integrity of packets received through redundant connections
• CPC Class Codes: Y10S 370/907 Synchronous optical network, SONET

Abstract

A flexible cross-connect with a data plane is presented which allows the establishment of connections between network interfaces at any network interface card to another network interface on any other network interface card. The system can cross-connect connections at an STS-1 and VT 1.5 granularity, and allows the switching and routing of information in a data plane without the use of the cross connect fabric. This permits routing, bridging, and concentration of data services to be performed without burdening of the cross connect. For reliability, a range of protection configurations can be employed including 1:1, 1:5 and mixed 1:N protection. A backplane is used which provides point-to-point traces between each card and the cross connect unit, between each card and a timing, communications and control unit, and between the network interface cards themselves.

Claims

1. A telecommunications cross-connect apparatus supporting multiple types of interface cards in a plurality of card slots comprising:

(a) a cross-connect unit;

(b) a control unit;

(c) a plurality of interface cards;

(d) a plurality of interface card slots; and

(e) a star backplane wherein the star backplane provides connectivity between each interface card slot and the cross-connect unit and between each interface card slot and the control unit such that a first interface card from the plurality of interface cards can be cross-connected with a second interface card from the plurality of interface cards independent of the interface card slot in which said first interface card is located; and

wherein point-to-point connections can be established among said plurality of interface cards without use of said cross-connect unit.

2. The apparatus described in claim 1 wherein the plurality of interface cards supports data connections at a data rate in the range of 10 Mb/s to at least 2.4 Gb/s.

3. The apparatus described in claim 1 wherein the plurality of interface cards supports optical interfaces having data rates in the range of 50 Mb/s to at least 2.4 Gb/s.

4. The apparatus described in claim 1 wherein the first interface card supports a first SONET ring, and wherein the second interface card supports a second SONET ring.

5. A telecommunications cross-connect apparatus supporting a cross-connection between signal paths on an interface card comprising:

(a) a cross-connect unit;

(b) a control unit;

(c) an interface card;

(d) an interface card slot; and

(e) a star backplane wherein the star backplane provides connectivity between the interface card slot and the cross-connect unit and between the interface card slot and the control unit such that a first signal path on the interface card inserted into the interface card slot can be cross-connected with a second signal path on the interface card; and

wherein point-to-point connections can be established among said plurality of interface cards without use of said cross-connect unit.

6. The apparatus described in claim 5 wherein the plurality of interface cards supports data connections in a data rate in the range of 10 Mb/s to at least 2.4 Gb/s.

7. The apparatus described in claim 5 wherein the plurality of interface cards supports optical interfaces having data rates in the range of 50 Mb/s to at least 2.4 Gb/s.

8. A telecommunications cross-connect apparatus electrical and optical interface cards in a plurality of cards slots comprising:

(a) a cross-connect unit;

(b) a control unit;

(c) a first set of interface cards supporting optical interfaces;

(d) a second set of interface cards supporting electrical interfaces;

(e) a plurality of interface card slots; and

(f) a star backplane wherein the star backplane provides connectivity between each interface card slot and the cross-connect unit and between each interface card slot and the control unit such that a first interface card from the first set of cards supporting optical interfaces inserted into one of the plurality of interface card slots can be cross-connected with a second interface card from the second set of interface cards supporting electrical interfaces independent of the interface card slot in which the first interface card is located; and

wherein point-to-point connections can be established among said plurality of interface cards without use of said cross-connect unit.

9. A telecommunications cross-connect apparatus supporting multiple types of interface cards in a plurality of card slots comprising:

(a) a cross-connect unit capable of supporting a plurality of connections operating at speeds in the range of 2.4 Gb/s to at least 9 Gb/s;

(b) a control unit;

(c) a plurality of interface cards;

(d) a plurality of interface card slots; and

(e) a star backplane wherein the star backplane provides connectivity between each interface card slot and the cross-connect unit using transmission paths supporting communications at rates in the range of 2.4 Gb/s to at least 9 Gb/s and which provides connectivity between each interface card slot and the control unit such that a first interface card from the plurality of interface cards can be cross-connected with a second interface card from the plurality of interface cards.

10. The apparatus described in claim 9 wherein the cross-connect between the first interface card from the plurality of interface cards and the second interface card from the plurality of interface cards is established independent of the interface card slot in which the first interface card is located.

11. The apparatus described in claim 9 wherein the cross-connect between the first interface card from the plurality of interface cards and the second interface card from the plurality of interface cards can be performed at a VT1.5 data rate.