The SGC has managed to create their own version of the Ancient long-range communication device. This is not surprising as Samantha Carter was able to emulate the frequency sent and received by the stones using a Tok'ra subspace communicator in the Stargate SG-1 season 9 episode "Crusade". This technology was first discovered in Merlin's Avalon cave in Glastonbury, England in the SG-1 episodes "Avalon, Part 2" and "Origin." That terminal was destroyed when Colonel Mitchell and Teal'c threw it into the unstable vortex of a forming wormhole to disconnect it from Daniel Jackson and Vala Mal Doran. In the Stargate Atlantis episode "Identity," another terminal was discovered in the Pegasus galaxy when Dr. Jennifer Keller is unknowingly swapped with a thief named Neeva Casol. That terminal was destroyed by Ronon.