# US 5,710,759 A · Switch protection arrangement

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- Number: US 5,710,759 A
- Document ID: US5710759A
- Status: Granted
- Kind: A
- Application number: 08/495,469
- Filed: 1995-12-08
- Granted: 1998-01-20
- Earliest claimed: 1993-01-27
- Assignees: GPT Limited
- Inventors: Geoffrey Chopping; Andrew James Barker; David Paul Stoney
- Web page: https://patentgrep.com/patent/US5710759A

## CPC

- H04Q 11/0478: {Provisions for broadband connections}
- H04J 3/08: Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J 3/14: Monitoring arrangements {(for SDH/SONET rings H04J3/085)}
- H04Q 11/0414: {Details}
- H04J 2203/0012: Switching modules and their interconnections
- H04J 2203/006: Fault tolerance and recovery
- H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

A telecommunication switch protection arrangement has information sent in the form of an information frame through a switch. The information in the frame is reorganized in the switch between input and output and checked for parity by using a V4 byte in the frame before being sent from the switch.

## Claims

### Claim 1

A telecommunications switch protection arrangement including: a switch including switch paths; means for establishing a switched connection through the switch; a plurality of interface cards including an originating interface card, said cards including a capability of generating and monitoring multiple test data fields and reporting any detected discrepancies; the switched connection comprising a format that includes a test data byte reserved for transporting a multiplicity of different test data fields used to assist in a determination of whether the switch paths are routed and operating correctly; wherein the data fields comprise: a multiframe synchronization pattern; a plurality of parity check bits generated from data carried by said switched connection; a number of a shelf containing the originating interface card; a number of a card position containing the originating interface card; a type number of the originating interface card; and a channel number used by the switched connection to enter the switch.

### Claim 2 (depends on 1)

A telecommunications switch protection arrangement as claimed in claim 1, including means for distributing data to the interface card at a destination of a switched connection; the data containing: the shelf number; the card number; the card type; and the channel number of the source of a switched connection.

### Claim 3 (depends on 1)

A telecommunication switch protection arrangement as claimed in claim 1, further including means for inhibiting reporting of some or all of the detected discrepancies.

### Claim 4 (depends on 1)

A telecommunication switch protection arrangement as claimed in claim 1, wherein the test data byte is a V4 byte of a synchronous digital hierarchy system tributary.

### Claim 5 (depends on 2)

A telecommunication switch protection arrangement as claimed in claim 2, further including means for inhibiting reporting of some or all of the detected discrepancies.

### Claim 6 (depends on 2)

A telecommunication switch protection arrangement as claimed in claim 2, wherein the test data byte is the V4 byte of a synchronous digital hierarchy system tributary.

### Claim 7 (depends on 3)

A telecommunication switch protection arrangement as claimed in claim 3, wherein the test data byte is the V4 byte of a synchronous digital hierarchy system tributary.

### Claim 8

A telecommunications switch protection arrangement including: a switch including switch paths; means for establishing a switched connection through the switch; a plurality of interface cards including an originating interface and, said cards including a capability of generating and monitoring multiple test data fields and reporting any detected discrepancies; the switched connection comprising a format that includes a test data byte reserved for transporting a multiplicity of different test data fields used to assist in a determination of whether the switch paths are routed and operating correctly; wherein the data fields comprise data which is characteristic of the originating interface card and of a channel used by the switched connection to enter the switch.