FASTLANE

FASTLANE is a family of bulk encryption of packet stream devices specified by the National Security Agency and manufactured by General Dynamics. The family, all intended for high-speed IEEE 802.3/Ethernet interfaces, is designated TSEC/KG-75. It encrypts packets within frames, and certainly not all bits; the frame headers and trailers must be present for the LAN to work.

It is the parent of the newer TACLANE TSEC/KG-175 for packets over LAN

Applications
FASTLANE is the main interface for classified traffic flowing directly onto circuits on the Defense Information Systems Network; it encrypts Asynchronous Transfer Mode (ATM) information and sends it to an ATM switch.