US5805586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method, device and data communication system for multilink polling
Assignee: Motorola Solutions Inc
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Filing: 1995-05-02
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Granted: 1998-09-08
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Expires: 2015-05-02
Abstract
Abstract A control station (8) is coupled to a plurality of tributary devices (20, 16, 18) by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels. The control station (8) broadcasts data to all the tributary devices (20, 16, 18) and selects a channel for a specific tributary device (20, 16, 18) to respond to a poll. After polling, the tributary device (20, 16, 18) changes the tributary device transmitter (42) to the frequency of the selected channel. The tributary device (20, 16, 18) either sends data to send to the control station (8) or sends a negative acknowledge to the control station (8). If a negative acknowledgment was transmitted, the control station (8) notifies the control station transmitter that the channel is idle.
Inventors
- 👤 John A. Perreault
- 👤 Abhay Joshi
- 👤 Mete Kabatepe
- 👤 Lawrence W. Lloyd
- 👤 Stephen Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:31
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/403
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
In a data communication system wherein a control station is coupled to a plurality of tributary devices by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels, each of the shared lower speed upstream data channels having a unique upstream channel frequency and a corresponding unique upstream channel identifier, a method for controlling access to the shared lower speed upstream data channels comprising the steps of: selecting one of the tributary devices to be polled; selecting one of the shared lower speed upstream data channels for transmission by the selected tributary device; and sending from the control station to the selected tributary device a poll message including the unique upstream channel identifier corresponding to the selected shared lower speed upstream data channel.
Claim 2
Dependent Claim
134 words
In a data communication system wherein a control station is coupled to a plurality of tributary devices by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels, each of the shared lower speed upstream data channels having a unique upstream channel frequency and a corresponding unique upstream channel identifier, a method for controlling access to the shared lower speed upstream data channels comprising the steps of: selecting one of the tributary devices to be polled; selecting one of the shared lower speed upstream data channels for transmission by the selected tributary device; and sending from the control station to the selected tributary device a poll message including the unique upstream channel identifier corresponding to the selected shared lower speed upstream data channel.
Claim 3
Dependent Claim
82 words
The method of claim 1 further comprising the steps of: receiving the poll message by the selected tributary device; obtaining the unique upstream channel identifier for the selected shared lower speed upstream data channel from the poll message; setting a tributary device transmitter to the unique upstream channel frequency of the selected shared lower speed upstream data channel; and transmitting, by way of the tributary device transmitter, a response to the poll message on the selected shared lower speed upstream data channel.
Claim 4
Dependent Claim
137 words
In a data communication system wherein a control station is coupled to a plurality of tributary devices by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels, each of the shared lower speed upstream data channels having a unique upstream channel frequency and a corresponding unique upstream channel identifier, the control station comprising: a control station poll processor for selecting a tributary device to be polled and for selecting one of the plurality of upstream data channels for transmission by the selected tributary device; a control station transmitter for transmitting a poll message to the selected tributary device including a unique channel identifier for the selected channel; and a control station receiver coupled to the selected channel for receiving transmission from the selected tributary device.
Claim 5
Dependent Claim
137 words
In a data communication system wherein a control station is coupled to a plurality of tributary devices by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels, each of the shared lower speed upstream data channels having a unique upstream channel frequency and a corresponding unique upstream channel identifier, the control station comprising: a control station poll processor for selecting a tributary device to be polled and for selecting one of the plurality of upstream data channels for transmission by the selected tributary device; a control station transmitter for transmitting a poll message to the selected tributary device including a unique channel identifier for the selected channel; and a control station receiver coupled to the selected channel for receiving transmission from the selected tributary device.
Claim 6
Dependent Claim
130 words
In a data communication system wherein a control station is coupled to a plurality of tributary devices by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels, each of the shared lower speed upstream data channels having a unique upstream channel frequency and a corresponding unique upstream channel identifier, a tributary device comprising: a tributary device receiver for receiving a poll message including a unique upstream channel identifier; a tributary device poll processor for processing the poll message; a frequency selector coupled to the poll processor for tuning a tributary device transmitter to a unique upstream channel frequency corresponding to the unique upstream channel identifier; and the tributary device transmitter for transmitting a response to the poll message.
Claim 7
Dependent Claim
130 words
In a data communication system wherein a control station is coupled to a plurality of tributary devices by way of at least one high speed broadcast downstream data channel and more than one shared lower speed upstream data channels, each of the shared lower speed upstream data channels having a unique upstream channel frequency and a corresponding unique upstream channel identifier, a tributary device comprising: a tributary device receiver for receiving a poll message including a unique upstream channel identifier; a tributary device poll processor for processing the poll message; a frequency selector coupled to the poll processor for tuning a tributary device transmitter to a unique upstream channel frequency corresponding to the unique upstream channel identifier; and the tributary device transmitter for transmitting a response to the poll message.
Claim 8
Dependent Claim
195 words
A data communication system comprising: a downstream channel; a plurality of upstream channels, each having a unique upstream channel frequency and a corresponding unique upstream channel identifier; a control station having a control station poll processor for selecting one of a number of tributary devices to be polled and for selecting one of the plurality of upstream channels for transmission by the selected tributary device, a control station transmitter coupled to the downstream channel for sending a poll message to the selected tributary device including a unique upstream channel identifier for the selected upstream channel, and a plurality of control station receivers, each coupled to one of the plurality of upstream channels; and at least one tributary device having a tributary device receiver coupled to the downstream channel for receiving the poll message from the control station, a tributary device transmitter coupleable to each of the plurality of upstream channels for transmitting a response to the poll message, a poll processor coupled to the tributary device receiver for processing the poll message, and a frequency selector for tuning the tributary device transmitter to the unique upstream channel frequency corresponding to the unique upstream channel identifier.
Claim 9
Dependent Claim
195 words
A data communication system comprising: a downstream channel; a plurality of upstream channels, each having a unique upstream channel frequency and a corresponding unique upstream channel identifier; a control station having a control station poll processor for selecting one of a number of tributary devices to be polled and for selecting one of the plurality of upstream channels for transmission by the selected tributary device, a control station transmitter coupled to the downstream channel for sending a poll message to the selected tributary device including a unique upstream channel identifier for the selected upstream channel, and a plurality of control station receivers, each coupled to one of the plurality of upstream channels; and at least one tributary device having a tributary device receiver coupled to the downstream channel for receiving the poll message from the control station, a tributary device transmitter coupleable to each of the plurality of upstream channels for transmitting a response to the poll message, a poll processor coupled to the tributary device receiver for processing the poll message, and a frequency selector for tuning the tributary device transmitter to the unique upstream channel frequency corresponding to the unique upstream channel identifier.
References Cited (Backward Citations)
US3728492A
Cited
US4608700A
Cited
US4669079A
Cited
US4872003A
Cited
US4742335A
Cited
US4787083A
Cited
US4989204A
Cited
US5132680A
Cited
US5194846A
Cited
US5347515A
Cited
US5473642A
Cited
US5577043A
Cited
US5586121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |