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Device and method for maintaining synchronization and frequency stability in a wireless telecommunication system

  • US 5,960,331 A
  • Filed: 07/01/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 07/01/1996
  • Status: Expired due to Term
First Claim
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1. A method for maintaining frequency stability in a wireless device of a telecommunication system which uses a network clock for normal operation thereof and in which the wireless communication device requires a clock input with a frequency more stable than that of a PEX system clock, the method comprising the steps of:

  • (a) providing an input to the wireless communication device from the PBX system clock;

    (b) operating the wireless communication device with reference to a precision oscillator which has a frequency stability which meets or exceeds the frequency stability requirement of the wireless communication device;

    (c) frequency synchronizing PBX system clock to network clock; and

    (d) evaluating the frequency stability of the PBX system clock input with reference to the precision oscillator, and based on the evaluation,(1) maintaining frequency stability of the wireless clock to the PBX system clock input while the frequency stability of the PBX system clock input meets the frequency stability requirement of the wireless communication device, and(2) not maintaining frequency stability of the wireless clock to the PBX system clock input while the frequency stability of the PBX system clock input does not meet the frequency stability requirement of the wireless communication device.

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