Bypass for telephone switching system
First Claim
1. A bypass unit for a telephone system having a plurality of spans of digital lines, a plurality of digital telephones, and a switch for connecting each digital telephone to each digital line in a normal operating mode of the system the digital lines extending to a central office via a main distribution frame, the bypass comprising:
- means for sensing a failure of the normal operating mode of the switch; and
means for switchably connecting each of the digital telephones to each of the digital lines in only one of the spans upon the sensing of the failure, wherein the means for switchably connecting is located in the main distribution frame and connects each of the digital telephones to the digital line thereby bypassing the switch, and wherein the means for switchably connecting is not in operation in the normal operating mode.
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Accused Products
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.
31 Citations
13 Claims
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1. A bypass unit for a telephone system having a plurality of spans of digital lines, a plurality of digital telephones, and a switch for connecting each digital telephone to each digital line in a normal operating mode of the system the digital lines extending to a central office via a main distribution frame, the bypass comprising:
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means for sensing a failure of the normal operating mode of the switch; and means for switchably connecting each of the digital telephones to each of the digital lines in only one of the spans upon the sensing of the failure, wherein the means for switchably connecting is located in the main distribution frame and connects each of the digital telephones to the digital line thereby bypassing the switch, and wherein the means for switchably connecting is not in operation in the normal operating mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of bypassing a telephone switch in a telephone system having a plurality of spans of digital lines, a plurality of digital telephones, the switch being for connecting each digital telephone to each digital line in a normal operating mode of the system, the digital lines extending to a central office via a main distribution frame, comprising:
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sensing a failure of the normal operating mode of the switch; switchably connecting each of the digital telephones to each of the digital lines in only one of the spans upon the sensing of the failure; and locating in the main distribution frame circuitry for performing the step of switchably connecting wherein each of the digital telephone is switchably connected to the digital line by the circuitry, thereby bypassing the switch, and wherein the circuitry is not in operation in the normal operating mode. - View Dependent Claims (13)
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Specification