	US 7,548,549 B2
	Method and apparatus for transmission of digital signals over a coaxial cable
Jeffrey James Bergeron, Ottawa (Canada); Huck Kung Loh, Kanata (Canada); James Benson Bacque, Ottawa (Canada); and Derrick Remedios, Ottawa (Canada)
Assigned to Jacobi Systems Corporation, Ottawa, Ontario (Canada)
Filed on Nov. 03, 2005, as Appl. No. 11/265,245.
Claims priority of provisional application 60/624538, filed on Nov. 04, 2004.
Prior Publication US 2006/0092967 A1, May 04, 2006
Int. Cl. H04L 12/413 (2006.01)

U.S. Cl. 370—419 [370/445; 709/246]

33 Claims

1. A method for transmitting forward and backward sequences of Ethernet packets, each sequence coded to be suitable for uni-directional transmission over a physical medium, between a first and a second Ethernet interface over a single coaxial cable, the method comprising the steps of:

(a) forming a backward signal from the backward coded sequence of packets at the first Ethernet interface for the transmission over the coaxial cable to the second Ethernet interface;

(b) forming a forward signal from the forward coded sequence of packets at the second Ethernet interface for the transmission over the coaxial cable to the first Ethernet interface, including providing an asymmetry in frequency or time characteristics between the forward and backward signals to avoid interference between the backward and forward signals and allow the transmission of both signals at the same time;

wherein the step (a) comprises coupling the backward coded sequence through a passive device to the coaxial cable;

wherein the step (b) comprises the step of:

modulating the forward coded sequence into a modulated coded signal having frequency spectrum above that of the backward coded sequence; and

coupling the modulated coded signal through a second passive device to the coaxial cable; and

wherein the forward and backward coded sequences are 100BaseT signals or 10BaseT signals, the backward coded sequence having a spectrum limited to below about 125 MHz, and the modulated coded signal having a frequency spectrum above about 125 MHz and below about a 1250 MHz.