Changes between Version 41 and Version 42 of Hardware/bDomains/aGrid

Timestamp:

Jul 13, 2016, 10:05:06 PM (8 years ago)

Author:

jkol

Comment:

—

Hardware/bDomains/aGrid

@@ -14 +14 @@
 
 ==== Massive-MIMO mini-racks ====
-There are four mini-racks located in the corners of the Grid specifically for massive-MIMO experiments. Each rack contains 8 Ettus USRP X310 software defined radios outfitted with two UBX 160 radio daughterboards each. Unlike USRPs in the main 20x20 Grid which are direct attached to individual nodes, each USRP inthe mini-racks is connected via 10G ethernet to the rest of the Grid domain. PPS and 10MHz synchronization signals are distributed among the USRPs in each rack via an Octoclock based timing distribution system. Equal length cables are used to ensure minimum timing deviation within and between the racks allowing for all USRPs across the four racks to by synchronized. Additional hardware is present in each rack to allow for power-cycling and "imaging" of the USRPs in a similar manner to standard nodes.
+There are four mini-racks located in the corners of the Grid specifically for massive-MIMO experiments. Each rack contains 8 Ettus USRP X310 software defined radios outfitted with two UBX 160 radio daughterboards each. Unlike USRPs in the main 20x20 Grid which are direct attached to individual nodes, each USRP in the mini-racks is connected via 10G ethernet to the rest of the Grid domain and appear as nodes (node23-1 through node23-8) that respond to standard OMF power commands and are visible/accessible on the network by any other node on the grid domain. PPS and 10MHz synchronization signals are distributed among the USRPs in each rack via an Octoclock based timing distribution system. Equal length cables are used to ensure minimum timing deviation within and between the racks allowing for all USRPs across the four racks to by synchronized. Additional hardware is present in each rack to allow for power-cycling and "imaging" of the USRPs in a similar manner to standard nodes.
 
  || [[Image(Massive-MIMO.jpg, 400px)]] ||