T1 describes the cabling, signal type, and signal regeneration requirements of the carrier system.
2.
In the mid-1990s, however, wavelength converting transponders rapidly took on the additional function of signal regeneration.
3.
Signal regeneration in transponders quickly evolved through 1R to 2R to 3R and into overhead-monitoring multi-bitrate 3R regenerators.
4.
Other solutions are necessary since the three-state phase-frequency detector does not work for certain applications involving randomized signal degradation, which can be found on the inputs to some signal regeneration systems ( e . g ., clock recovery designs ).
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