The ACS8944 JAM PLL is a Jitter- Attenuating, Multiplying Phase-Locked Loop, for generating low jitter output clocks compliant up to SONET OC-12 and STM-4 622.08 MHz specifications. Its primary function is to clean up clock jitter for high performance optical line cards which have OC-3 or OC-12 SONET serializers or framers, and is the entry level device in Semtech's range of JAM PLLs.