Patent US4972452A successfully refreshed from Google Patents.
US4972452A
Expired / Lapsed
US
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Digital bypass for telephone system
Assignee: Aspect Communications Corp
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Filing: 1989-11-09
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Granted: 1990-11-20
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Expires: 2009-11-09
Abstract
Abstract A digital bypass unit for a PBX or ACD telephone system having T1 spans provides the capability to place and answer calls on a digital T1 span in the event of a system failure or power failure. The bypass unit permits the bypass of the failed system, connecting T1 channels directly to digital telephone sets, and is automatically activated in the event of power or system failure. Queueing and distribution of incoming calls are both provided when the system is in the bypass mode.
Inventors
- 👤 Michael A. Chack
- 👤 John D. Meyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:38
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/58; H04M; H04M3/00; H04M3/08; H04M3/12; H04M3/42; H04M3/50; H04M3/51; H04M3/523; H04M19/00; H04Q1/00; H04Q1/02; H04Q1/14; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
58 words
A bypass for a telephone system having a plurality of digital lines and a plurality of digital telephone sets, comprising: a switch for connecting each telephone set to each line; and a bypass for the switch allowing connection of each of the telephone sets to each of the plurality of digital lines upon a failure of the switch.
Claim 2
Dependent Claim
58 words
A bypass for a telephone system having a plurality of digital lines and a plurality of digital telephone sets, comprising: a switch for connecting each telephone set to each line; and a bypass for the switch allowing connection of each of the telephone sets to each of the plurality of digital lines upon a failure of the switch.
Claim 3
Dependent Claim
29 words
The device of claim 1, wherein the bypass includes means for queuing incoming calls on the digital lines and distributing the queued calls to each of the telephone sets.
Claim 4
Dependent Claim
36 words
The device of claim 1, wherein the bypass includes one relay for each line of the plurality of digital lines, for connecting each of the telephone sets to any one of the plurality of digital lines.
Claim 5
Dependent Claim
17 words
The device of claim 1, further including an internal power source for providing power to the bypass.
Claim 6
Dependent Claim
21 words
The device of claim 1, further comprising means for automatically enabling the bypass upon detection of the failure of the switch.
Claim 7
Dependent Claim
33 words
The device of claim 1, wherein the bypass includes means for establishing a full duplex audio path between each one of the plurality of digital lines and each one of the telephone sets.
Claim 8
Dependent Claim
22 words
The device of claim 2, wherein the means for queuing includes means for distributing the incoming calls to a free telephone set.
Claim 9
Dependent Claim
27 words
The device of claim 1, wherein the bypass includes means for configuring the bypass for use with any one of a plurality of types of digital lines.
Claim 10
Dependent Claim
94 words
A bypass for bypassing a telephone switch comprising: a telephone set interface connectable to a plurality of digital telephones; a trunk line interface connectable to a plurality of digital telephone lines; switching means connected to the telephone set interface and trunk line interface for connecting any one of the digital telephones to any one of the digital telephone lines by a full duplex audio path; means for digitally attenuating individually each one of the digital telephone lines; and control means for activating the switching means in response to a failure of the telephone switch.
Claim 11
Dependent Claim
94 words
A bypass for bypassing a telephone switch comprising: a telephone set interface connectable to a plurality of digital telephones; a trunk line interface connectable to a plurality of digital telephone lines; switching means connected to the telephone set interface and trunk line interface for connecting any one of the digital telephones to any one of the digital telephone lines by a full duplex audio path; means for digitally attenuating individually each one of the digital telephone lines; and control means for activating the switching means in response to a failure of the telephone switch.
Claim 12
Dependent Claim
13 words
The device of claim 9, wherein the switching means comprises a crosspoint switch.
Claim 13
Dependent Claim
15 words
The device of claim 9, wherein the control means includes means for sensing the failure.
Claim 14
Dependent Claim
30 words
The device of claim 9, wherein the control means further includes means for queuing incoming calls on the digital telephone lines and distributing the queued calls to the telephone sets.
Claim 15
Dependent Claim
26 words
The device of claim 9, further comprising means for configuring the bypass for use with any one of a plurality of types of digital telephone lines.
Claim 16
Independent Claim
82 words
A method of bypassing a telephone switch for connecting any one of a plurality of digital lines to any one of a plurality of digital telephone sets, comprising the steps of: determining a failure of the switch; bypassing the switch upon determination of failure; and selectively connecting any one of the telephone sets to any one of the plurality of digital lines upon receipt of an incoming call, and also upon initiation of an outgoing call from any of the telephone sets.
Claim 17
Independent Claim
82 words
A method of bypassing a telephone switch for connecting any one of a plurality of digital lines to any one of a plurality of digital telephone sets, comprising the steps of: determining a failure of the switch; bypassing the switch upon determination of failure; and selectively connecting any one of the telephone sets to any one of the plurality of digital lines upon receipt of an incoming call, and also upon initiation of an outgoing call from any of the telephone sets.
References Cited (Backward Citations)
US4575584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |