Using 4 values instead of 2, 4-level FSK allows for double the data rate alternatively, it is possible to send the same amount of data using half the bandwidth. With 4-level FSK, codes 00, 01, 10 and 11 indicate frequency shifts of +Δf, +3Δf, -Δf and -3Δf. For example, with 2-level FSK, bit 0 changes the carrier frequency to -Δf, while bit 1 changes the carrier frequency to +Δf. 4-Level FSK modulationįrequency Shift Keying (FSK) is a modulation method by which the instantaneous frequency of a carrier is discretely changed according to a digital code. This function employs a sequential transmission of 2 audible tones for user selection, enabling the receiver to hear an alert tone. 100BASE-TX equipment is usually compatible with 10BASE-T, so it is possible for them to coexist on a single network. 10BASE-T can be used to transmit data at up to 10Mbps over a maximum distance of 100 meters, while 100BASE-TX is capable of data transmission at 100Mbps over the same distance. Both 10BASE-T and 100BASE-TX are used to link equipment in a star-configured LAN via a hub. 100BASE-TX is a general term referring to a group of fast Ethernet standards used for transmission over twisted-pair cables, etc.
This combines the 10BASE-T and 100BASE-TX Ethernet standards into a single term.
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