Cellular communication system with remote power source for providing power to access points

• US 5,946,617 A
• Filed: 06/28/1996
• Issued: 08/31/1999
• Est. Priority Date: 06/28/1996
• Status: Expired due to Term

• Current Assignee: Symbol Technologies, LLC (Zebra Technologies Corporation)
• Original Assignee: Telxon Corporation (Zebra Technologies Corporation)
• Inventors: Baird, Thomas A., Portaro, James D.
• Primary Examiner(s): LE, THANH C
• Application Number:
  US08/672,429
• Time in Patent Office: 1,159 Days
• Field of Search: 455/402, 455/127, 455/343, 455/561, 455/560, 455/572, 455/422, 379/307, 379/322, 379/324, 379/413
• US Class Current: 455/422.1
• CPC Class Codes: H04B 7/26 at least one of which is mobile

Abstract

A cellular communication system which eliminates high costs and difficulties associated with providing electrical power to the access points. The cellular communication system includes a remote power source which obviates the need to install an AC power outlet in close proximity to each access point. The remote power source transforms AC power to DC power at a central remote location, and provides as its output one or more low voltage DC power lines. By performing the AC/DC power transformation at a central location, only the low voltage DC power lines need to be fed to each access point. The remote power source also includes a backup power supply feature and an alarm to draw attention to system malfunctions.

Claims

1. A cellular communication system, comprising:

a system backbone;

a host computer coupled to the system backbone;

a plurality of access points coupled to the system backbone and distributed at different physical locations;

at least one mobile device for communicating on the system backbone via wireless communications with an access point selected among the plurality of access points; and

a remote power source for providing DC power to the plurality of access points, the remote power source being located remotely from at least one of the plurality of access points and including;

an AC/DC converter for converting AC power to DC power and for providing the DC power at an output, wherein the AC/DC converter comprises a primary AC/DC converter for providing the DC power at the output and a backup AC/DC converter for providing the DC power at the output in the event of an operational failure of the primary AC/DC converter; and

at least one DC power line extending between the output of the AC/DC converter and respective power inputs of the plurality of access points.

2. The system of claim 1, wherein the remote power source includes separate DC power lines between the output of the AC/DC converter and each of the plurality of access points.

3. The system of claim 1, wherein the at least one DC power line comprises a plenum rated shielded cable.

4. The system of claim 1, wherein the remote power source includes a visual display for indicating provision of the DC power to the at least one DC power line.

5. The system of claim 1, wherein the at least one DC power line is substantially unencumbered by conduit.

6. The system of claim 1, wherein the at least one DC power line shares a common run with the system backbone.

7. The system of claim 1, wherein the at least one mobile device comprises a mobile terminal.

8. A cellular communication system, comprising:

a system backbone;

a host computer coupled to the system backbone;

a plurality of access points coupled to the system backbone and distributed at different physical locations;

at least one mobile device for communicating on the system backbone via wireless communications with an access point selected among the plurality of access points; and

a remote power source for providing exclusively DC power to the plurality of access points, the remote power source being located remotely from at least one of the plurality of access points and including;

an AC/DC converter for converting AC power to DC power and for providing the DC power at an output, wherein the AC/DC converter comprises a primary AC/DC converter for providing the DC power at the output and a backup AC/DC converter for providing the DC power at the output in the event of an operational failure of the primary AC/DC converter; and

at least one DC power line extending between the output of the AC/DC converter and respective power inputs of the plurality of access points.

9. The system of claim 8, wherein the remote power source includes a visual display for indicating the failure of the primary AC/DC converter.

10. The system of claim 8, wherein the remote power source includes an audible indicator for indicating the failure of the primary AC/DC converter.

11. A cellular communication system, comprising:

a system backbone;

a host computer coupled to the system backbone;

a plurality of access points coupled to the system backbone and distributed at different physical locations;

at least one mobile device for communicating on the system backbone via wireless communications with an access point selected among the plurality of access points; and

a remote power source for providing exclusively DC power to the plurality of access points, the remote power source being located remotely from at least one of the plurality of access points and including;

an AC/DC converter for converting AC power to DC power and for providing the DC power at an output, wherein the AC/DC converter includes a plurality of primary AC/DC converters for providing the DC power at the output for respective ones of the plurality of access points, and at least one backup AC/DC converter for providing at least a portion of the DC power at the output in the event of an operational failure of one of the plurality of primary AC/DC converters; and

at least one DC power line extending between the output of the AC/DC converter and respective power inputs of the plurality of access points.

12. The system of claim 11, wherein the remote power source includes a compare and select circuit for each of the primary AC/DC converters with each of the compare and select circuits having as inputs the output of the corresponding primary AC/DC converter and the output of the backup AC/DC converter, and each of the compare and select circuits functioning to output selectively one of its inputs to the output of the AC/DC converter.

13. In a cellular communication system comprising a system backbone, a host computer coupled to the system backbone, a plurality of access points coupled to the system backbone and distributed at different physical locations, and at least one mobile device for communicating on the system backbone via wireless communications with an access point selected among the plurality of access points, a method of providing DC power to the plurality of access points comprising the steps of:

converting AC power to DC power at a location which is remote from the location of at least one of the access points and providing the DC power at an output, the converting step also including a step of using a primary AC/DC converter for providing the DC power at the output and a backup AC/DC converter for providing the DC power at the output in the event of an operational failure of the primary AC/DC converter; and

providing the DC power at the output to respective power inputs of the plurality of access points using at least one DC power line.

14. The method of claim 13, wherein the step of providing the DC power includes the step of connecting separate DC power lines between the output and each of the plurality of access points.

15. The method of claim 13, wherein the at least one DC power line comprises a plenum rated shielded cable.

16. In a cellular communication system comprising a system backbone, a host computer coupled to the system backbone, a plurality of access points coupled to the system backbone and distributed at different physical locations, and at least one mobile device for communicating on the system backbone via wireless communications with an access point selected among the plurality of access points, a method of providing power to the plurality of access points comprising the steps of:

converting AC power to DC power at a location which is remote from the location of at least one of the access points and providing the DC power at an output, the converting step also including a step of using a primary AC/DC converter for providing the DC power at the output and a backup AC/DC converter for providing the DC power at the output in the event of an operational failure of the primary AC/DC converter; and

providing the DC power at the output to respective power inputs of the plurality of access points using at least one DC power line.

17. The method of claim 16, wherein the at least one DC power line is substantially unencumbered by conduit.

18. The method of claim 16, wherein the at least one DC power line shares a common run with the system backbone.

19. The method of claim 16, wherein the at least one mobile device comprises a mobile terminal.