Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Patent
1996-03-28
1998-11-17
Pham, Chi H.
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
340825, H04B 140
Patent
active
058387234
ABSTRACT:
A transmission termination circuit able to reduce transmission signal reflections and resultant data corruption such that a single network may selectively communicate data using either a voltage driven transceiver or a current driven transceiver. A 10BASE-T transceiver has differential voltage driven outputs. A first output is coupled to a first terminal of a primary winding of a transformer through a first resistor. A second output is coupled to a second terminal of the first primary winding through a second resistor. A 100BASE-TX transceiver has differential current driven outputs. A first output is coupled to a first terminal of a second primary winding of the transformer. A second output is coupled to a second terminal of the second primary winding. A resistive snubber comprising a resistor in series with a capacitor is coupled across the 100BASE-TX outputs. A twisted-pair network is coupled to a secondary winding of the transformer. When transmitting in 10BASE-T format, the resistive snubber suppresses voltage transients caused by a leakage inductance in series with the reflected 10BASE-T circuit. The snubber has a time constant which is large enough suppress transients during transmission by the 100BASE-TX circuit, but small enough to not interfere with transmission by the 10BASE-T transceiver. The snubber matches impedances of the 10BASE-T and the 100BASE-TX transceivers over a wide range of frequencies to prevent signal reflections.
REFERENCES:
patent: 4782300 (1988-11-01), Bonaccio et al.
patent: 5541957 (1996-07-01), Lau
"Application Note 44 Designing Fast Ethernet and FDDI-UTP Transceivers", Micro Linear Corporation, Aug. 1995.
"Application Brief 3 ML6673 and Baseline Wander", Micro Linear Corporation, Jul. 1995.
"ML-6673 Fast Ethernet/FDDI TP-PMD Transceiver", Micro Linear Corporation, May 1995.
"Application Note 28 Designing a 100MbP/s UTP Transceiver for Local Area Network", Mirco Linear Corporation, Mar. 1994.
"DP 83840 10/100 Mb/s Ethernet Physical Layer", National Semiconductor Corporation, Feb. 22, 1995.
Mack Michael P.
Marzolf Phillip R.
Luther William
Micro Linear Corporation
Pham Chi H.
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