Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1998-02-17
2001-12-04
Ngyuen, Chau (Department: 2663)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S522000
Reexamination Certificate
active
06327265
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
Electronic Communications, Telephonic Communications
2. Description of the Related Art
Communications between transmitters and receivers follow specific protocols and formats. The rapid development of such devices as modems, fax, personal communicators and security services has resulted in a large number of different formats. The format used often varies from one model to another even in devices performing the same function and made by the same manufacturer. In lieu of receivers dedicated to receive a particular transmission format, it is preferable to use receivers which can adapt to different formats readily.
A receiver which adapts automatically to different formats is described by present applicants in U.S. Pat. No. 6,034,619. In general, transmitters attempting to communicate with a receiver will not begin to send data until they have confirmation that a connection to the receiver is made. Once a connection is made, the receiver emits a signal, sometimes referred to as a handshake signal, which will then cause the transmitter to begin to send its data. Different transmitters require different handshake signals and the data format will vary also. The mentioned Patent describes a receiver designed to emit a sequence of different handshakes corresponding to different data formats which is capable to adapt to different data formats and to communicate with different types of transmitters.
The proliferation of different protocols has resulted in the need to emit a sequence of many different types of handshakes. When the transmitter detects its corresponding handshake, it starts its transmission and the receiver then stops emitting its handshake sequence. It is of interest to shorten the sequence, since the time for the transmitter to wait for its corresponding handshake would then be reduced. It is also advantageous to prevent any extraneous and unnecessary signals from being emitted. Such signals are potential causes of unreliability and problems to the signaling environment.
SUMMARY OF THE INVENTION
The location or other description of the source of a transmission is inserted into the communication as a prefix to data. A receiver capable of communicating in many different protocols and formats emits a sequence of different handshakes until the transmitter begins to respond. The receiver stores the received prefix and a descriptor corresponding to the handshake, among the sequence of different handshakes, which causes the transmitter to begin signaling. Subsequent signals with a stored prefix are greeted immediately with the associated stored handshake. This results in a reduced wait by the transmitter to begin transmission and the elimination of extraneous signals.
REFERENCES:
patent: 5426637 (1995-06-01), Derby
patent: 5475818 (1995-12-01), Molyneaux et al.
patent: 5611048 (1997-03-01), Jacobs et al.
patent: 5949861 (1999-09-01), Chan et al.
patent: 5961626 (1999-10-01), Harrison et al.
Hoffman Edwin
Osborne Paul Wray
Hyun Soon-Dong
Interlogix, Inc.
Ngyuen Chau
Stoel Rives LLP
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