General Description
The VSC8122-FEC is a single chip clock recovery IC for use in SONET OC-48, OC-24, OC-12, OC-3, or Gigabit Ethernet systems operating at their respective 2.488Gb/s (up to 2.66606Gb/s FEC), 1.244Gb/s, 622Mb/s, 155Mb/s, or 1.25Gb/s data rates. It complies with SONET jitter tolerance, jitter transfer and jitter generation specifications.
Alarm functions support typical telecom system applications. The Loss of Lock (LOL) output indicates when the device goes out of lock, which would most often occur in the event of a loss of valid data. The NOREF output flags when the reference input to the VSC8122-FEC either is removed, or goes severely out of tolerance.

FEATUREs
• Multi-Rate OC-3, OC-12, OC-24, OC-48 Clock and Data Recovery
• Supports OC-48 FEC Rates
• Supports Gigabit Ethernet
• Differential Back Terminated I/O
• Maintains Clock Output in the Absence of Data
• Selectable Reference Clock
• Loss of Lock Indicator
• Exceeds SONET/SDH Requirements for Jitter Tolerance, Jitter Transfer and Jitter Generation
• 3.3V Supply Operation
• 1W Typical Power
• 10x10 mm 64-Pin PQFP Packaging