Browse Prior Art Database

Dual Media Transceiver

IP.com Disclosure Number: IPCOM000060988D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bond, PW: AUTHOR [+3]

Abstract

A digital data transceiver circuit is described which provides with one set of circuitry means for allowing data communication over long (5000') or short lengths of either coaxial cable or shielded twisted pair. As shown in the drawing, the system comprises basically a driver 10, receiver 12, band-pass filter 14, transformer 16, and RC network 18. Driver 10 uses a pair of differential current switches and associated current sources to provide a current amplified output having a stepped configuration, as depicted in the inset (A). This stepped configuration operates, in conjunction with transformer 16 to provide a signal having desired "predistortion". The differential outputs are coupled to resistors R1 and R2 and data lines 20 and 22 to two windings of the three winding transformers 16.

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Dual Media Transceiver

A digital data transceiver circuit is described which provides with one set of circuitry means for allowing data communication over long (5000') or short lengths of either coaxial cable or shielded twisted pair. As shown in the drawing, the system comprises basically a driver 10, receiver 12, band-pass filter 14, transformer 16, and RC network 18. Driver 10 uses a pair of differential current switches and associated current sources to provide a current amplified output having a stepped configuration, as depicted in the inset (A). This stepped configuration operates, in conjunction with transformer 16 to provide a signal having desired "predistortion". The differential outputs are coupled to resistors R1 and R2 and data lines 20 and 22 to two windings of the three winding transformers 16. RC bridge 18 includes a switch S2, and optional switch S1, which can be actuated by a coded connector arrangement to provide either balanced or unbalanced termination for the transmission line connections M, S and C. M is the middle connector, C the center, and S the shield. In coax operation C and S are used, while in twisted pair all three are used, with M and C carrying the signal. Switches S1 and S2 are closed in coaxial transmission. Receiver 12 is AC coupled to transformer 16 through band-pass filter 14. AC coupling is provided since the output configuration of driver 10 causes transformer 16 to operate at the power supply voltage. Receiver 12 may be...