×

Trunked radio repeater communication system

  • US 6,529,486 B1
  • Filed: 04/10/1998
  • Issued: 03/04/2003
  • Est. Priority Date: 04/11/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A communications protocol for a system of one or more repeaters and one or more subscribers, comprising:

  • a plurality of word formats for communications between the one or more repeaters and the one or more subscribers, each word format including;

    a nine bit synchronization code for receiver synchronization;

    a one bit type code indicating a first word format and a second word format and compatible with protocols using an area code to identify subscribership to a particular repeater site; and

    a seven bit checksum code to error check communicated words; and

    where the first word format further includes;

    a five bit channel in use code to identify a channel in use;

    a five bit home code identifying a home channel;

    an eight bit group code providing a code for one or more groups of subscribers; and

    a five bit free code identifying a free channel; and

    wherein the second word format further includes function specific codes to perform a plurality of functions.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×