Note 28

This is the current hardware configuration for the Atlantic Packet Satellite Project. The Goonhilly, Tanum, and Etam Satellite IMPs are ARPANET nodes. The UCL, NDRE, and BBN PDP-11 gateways are doubly-connected ARPANET hosts, each with a VDH connection to a Satellite IMP and a distant host connection to another ARPANET node. The Clarksburg Satellite IMP is a node on the RCC (Research Computer Center) net. The RCC net and the ARPANET are linked by some gateway code in the PTIP (Pluribus Tip) at BBN; this code acts as a host on both the RCC net's PTIP and the ARPANET'S RCC IMP.