TELEPHONE COMMUNICATION SYSTEM AND METHOD OVER LOCAL AREA NETWORK WIRING
First Claim
1. A device for coupling digital data signals and a further signal said device comprising:
- first and second Local Area Network (LAN) cables, each cable having at least first and second wire pairs connected for carrying the digital data over the wire pairs and the further signal over a phantom channel formed between the wire pairs,a digital data component having first and second ports;
a first LAN connector for connecting to said first LAN cable;
a first signal transformer having a center tap and coupled between said first port and said first LAN connector for passing only digital data signals between said first port and said first wire pair of said first LAN cable;
a second signal transformer having a center tap and coupled between said first port and said first LAN connector for passing only digital data signals between said first port and said second wire pair of the first LAN cable;
a second LAN connector for connecting to said second LAN cable;
a third signal transformer having a center tap and coupled between said second port and said second LAN connector for passing only digital data signals between said second port and said first wire pair of said second LAN cable; and
a fourth signal transformer having a center tap and coupled between said second port and said second LAN connector for passing only digital data signals between said second port and said second wire pair of said second LAN cable,wherein said center taps of said first, second, third and fourth signal transformers and said first and second LAN cables form a phantom channel for conducting the further signal.
11 Assignments
0 Petitions
Accused Products
Abstract
A device for enabling a local area network wiring structure to simultaneously carry digital data and analog telephone signals on the same transmission medium. It is particularly applicable to a network in star topology, in which remote data units (e.g. personal computers) are each connected to a hub through a cable comprising at least two pairs of conductors, providing a data communication path in each direction. Modules at each end of the cable provide a phantom path for telephony (voice band), signals between a telephone near the data set and a PBX, through both conductor pairs in a phantom circuit arrangement. All such communication paths function simultaneously and without mutual interference. The modules comprise simple and inexpensive passive circuit components.
103 Citations
15 Claims
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1. A device for coupling digital data signals and a further signal said device comprising:
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first and second Local Area Network (LAN) cables, each cable having at least first and second wire pairs connected for carrying the digital data over the wire pairs and the further signal over a phantom channel formed between the wire pairs, a digital data component having first and second ports; a first LAN connector for connecting to said first LAN cable; a first signal transformer having a center tap and coupled between said first port and said first LAN connector for passing only digital data signals between said first port and said first wire pair of said first LAN cable; a second signal transformer having a center tap and coupled between said first port and said first LAN connector for passing only digital data signals between said first port and said second wire pair of the first LAN cable; a second LAN connector for connecting to said second LAN cable; a third signal transformer having a center tap and coupled between said second port and said second LAN connector for passing only digital data signals between said second port and said first wire pair of said second LAN cable; and a fourth signal transformer having a center tap and coupled between said second port and said second LAN connector for passing only digital data signals between said second port and said second wire pair of said second LAN cable, wherein said center taps of said first, second, third and fourth signal transformers and said first and second LAN cables form a phantom channel for conducting the further signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for coupling digital data signals and a DC signal to first and second Local Area Network (LAN) cables, each cable having at least first and second twisted wire pairs connected for carrying full-duplex packet-based digital data over the wire pairs and a signal over a phantom channel formed between the twisted wire pairs, said device comprising a single enclosure and, in said single enclosure:
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a digital data packet-based component having first and second ports; a first LAN connector for connecting to the first LAN cable; a first signal transformer having a center tap and coupled between said first port and said first LAN connector for passing only digital data signals between said first port and the first twisted wire pair of the first LAN cable; a second signal transformer having a center tap and coupled between said first port and said first LAN connector for passing only digital data signals between said first port and the second twisted wire pair of the first LAN cable; a second LAN connector for connecting to the second LAN cable; a third signal transformer having a center tap and coupled between said second port and said second LAN connector for passing only digital data signals between said second port and the first twisted wire pair of the second LAN cable; a fourth signal transformer having a center tap and coupled between said second port and said second LAN connector for passing only digital data signals between said second port and the second twisted wire pair of the second LAN cable; and a third connector connected for receiving a DC signal, wherein said third connector is coupled to the center taps of said first and second signal transformers, for passing the DC signal onto a phantom channel over the first cable; and said third connector is coupled to the center taps of said third and fourth signal transformers, for passing the DC signal onto a phantom channel over the second cable. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification