Switch element for fiber channel networks

• US 5,519,695 A
• Filed: 10/27/1994
• Issued: 05/21/1996
• Est. Priority Date: 10/27/1994
• Status: Expired due to Term

• Current Assignee: Brocade Communications Systems, Inc. (Broadcom, Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Mallavalli, Kumar, Stoevhase, Bent, Purohit, Robin
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US08/330,155
• Time in Patent Office: 572 Days
• Field of Search: 370/58.1, 370/58.2, 370/58.3, 370/60, 370/60.1, 370/61, 370/68.1, 370/94.1, 370/94.2, 359/117
• US Class Current: 370/352
• CPC Class Codes: H04L 12/2852 Metropolitan area networks
• CPC Class Codes: H04L 12/44 Star or tree networks

Abstract

A system for facilitating data communications in a fiber channel network is presented. The system comprises a fiber optic switch element which enables implementation of a Fiber Channel network by permitting selective interconnection of a plurality of fiber optic channels. The fiber optic switch element permits both circuit and frame switching. The switch element comprises a switch module which is connected to at least one fabric-port within the fiber channel fabric. The switch module allocates switching bandwidth. A path allocation system, which is connected to the switch module, generally directs frames of data between the at least one fabric-port to other fabric-ports located within the fabric. A channel module comprising a port intelligence mechanism is disposed between the switch module and the fabric-ports. An element controller provides centralized fabric management.

Claims

1. An apparatus for facilitating data communications in fibre channel network, the fibre channel having first and second fabric ports, the apparatus comprising:

a switch module connected to the first fabric port and the second fabric port;

a channel control box disposed between the switch module and the first fabric port;

first and second fiber optic channels, the first fiber optic channel disposed between the first fabric port and the channel control box, the second fiber optic channel disposed between the second fabric port and the channel control box;

an element controller connected to the switch module; and

a path allocation system connected to the element controller and the switch module, the path allocation system allocates an interconnect path between the first fabric port and the second fabric port,

wherein the switch module comprises;

a status MUX disposed between the channel control box and the path allocation system, the status MUX is configured to receive a plurality of status signals indicative the first and second fiber optic channels;

a main distribution network disposed between the channel control box and the path allocation system, the main distribution network interconnects the first and second fiber optic channels; and

a control distribution network disposed between the channel control box and the path allocation system.

2. The apparatus of claim 1, wherein the channel control box comprises:

a port intelligence system connected to the first and second fabric ports, the port intelligence system is configured according to a first protocol; and

a memory interface system connected to the port intelligence system, the memory interface system receives and transmits data from the first and second fabric port to the first and second fiber optic channels.

3. The apparatus of claim 2, wherein the port intelligence system comprises at least one transceiver and a first application-specific integrated circuit.

4. The apparatus of claim 3, wherein the memory interface system comprises at least one frame buffer and a second application-specific integrated circuit, the second application-specific integrated circuit is connected to the main distribution network.

5. The apparatus of claim 4, wherein the at least one frame buffer is a random access memory configured with a bit-sliced organization.

6. The apparatus of claim 5, wherein the first protocol is Fibre Channel protocol.