8T49N282

FemtoClock® NG Octal Universal Frequency Translator 8T49N282 DATA SHEET General Description The 8T49N282 has two independent, fractional-feedback PLLs that can be used as jitter attenuators and frequency translators. It is equipped with six integer and two fractional output dividers, allowing the generation of up to eight different output frequencies, ranging from 8kHz to 1GHz. Four of these frequencies are completely independent of each other and the inputs. The other four are related frequencies. The eight outputs may select among LVPECL, LVDS or LVCMOS output levels. This functionality makes it ideal to be used in any frequency translation application, including 1G, 10G, 40G and 100G Synchronous Ethernet, OTN, and SONET/SDH, including ITU-T G.709 (2009) FEC rates. The device may also behave as a frequency synthesizer. The 8T49N282 accepts up to four differential or single-ended input clocks and a crystal input. Each of the two internal PLLs can lock to different input clocks which may be of independent frequencies. The other two input clocks are intended for redundant backup of the primary clocks and must be related in frequency to their primary. The device supports hitless reference switching between input clocks. The device monitors all input clocks for Loss of Signal (LOS), and generates an alarm when an input clock failure is detected. Automatic and manual hitless reference switching options are supported. LOS behavior can be set to support gapped or un-gapped clocks...