ESnet is running a dual OC-3 microwave link to provide connectivity to NERSC, the National Energy Research Scientific Computing Center in downtown Oakland, CA from Berkeley Lab. We had some early equipment failures that kept the bandwidth to a single OC-3 for a while, but it's been operating quite well for several months, now. While we have an OC-48 fiber on order, it could not be installed before NERSC moved from Berkeley Lab to Oakland due to permit issues and having a super-computer center with no external connections seemed like a bad idea. Microwave was the obvious option as we have a clear line of sight of only about 5 miles. OC-6 is less bandwidth than we would like, but the users are at least getting passable access. R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634