what is cpak
CPAK, the first implementation of Ciscoâs CMOS photonics technology, shatters all of these barriers. Cisco CPAK modules are less than one third the size of CFP modules, and dissipate less than one third the power (nominally less than 5.5W for CPAK 100GBASE-LR4). As a result, they can support more than ten 100-Gbps ports, allowing the optics on a Terabit-capacity line card to dissipate just 55W of transceiver power.