== SB4 ==
1. Need two rf switches
1. each links matrix, 1 node, and 1 basestation
1. all are controlled by raspberry pi, named sb4-cm



== WIMAX ==




== LTE ==



== Switch Matrix ==

1. need two non-blocking switch / attenuator matrix
1. Connect B210s through switch matrix
1. B210s have 2x tx, 2x rx
1. 4 ports per b210, 2 ports per node
1. compare pricing from DIY, minicircuits, jfw
1. ex, 4 b210s
1. set up two rails, 8 ports per rail, atten and delay between
1. need price per attenuator.