| 单词 | SPOT (Single Point Of Termination) |
| 释义 | SPOT (Single Point Of Termination) DC power from data signals on the end of a PoE (Power over Ethernet) cable. See also DC and PoE. 3. A passive optical device that splits an incident optical signal, or beam, into two or more beams with total power equal to or less than the incident beam. Splitters commonly are signal paths etched into a dielectric material. Splitters also can be made of glass optical fibers twisted together and fused. Passive optical network (PON) local loops use cascading optical splitters, each of which evenly splits the incoming signal into two outgoing signals, each of which is at approximately 50 percent of the power level of the incident signal. As a passive network, PON does not amplify the signal.The splitter illustrated in Figure S-7 comprises three 1:2 splits for a total split ratio of 1:8, with the outgoing signal over each distribution fiber having a power level equivalent to approximately 12.5 percent (1⁄8) that of the incoming signal.As each split approximately halves the signal power, there are limits to the number of signal splits that can be tolerated over a circuit of a given length. A PON splitter might have a split ratio of 1:2 (one split), 1:4 (two splits), 1:8 (three splits), 1:16 (four splits), 1:32 (five splits), 1:64 (six splits), or 1:128 (seven splits). See also amplifier, dielectric, local loop, passive, PON, power, and signal. |
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