| | 1 | ==== SB4 ==== |
| | 2 | [[TOC(Hardware, Hardware/bDomains, Hardware/bDomains/cSandboxes*, depth=6)]] |
| | 3 | |
| | 4 | As shown in Figure 1, sandbox 4 consists of 10 nodes and two LTE and two WiMAX basestations and corresponding BS controllers. To prevent interference, each node is housed in [http://www.ramseytest.com/ Ramsey Electronics RF enclosure] that provides 80 dB of isolation. Each of the 9 nodes is equipped with a pair of WiFi devices: one Atheros 5000X mini-PCI card and one Intel 6250 mini-PCIe 802.11/802.16. 4 nodes are also equipped with [wiki:Hardware/fDevices/cSDR/gUSRP#USRPB205 USRP B205mini-i] SDR devices. All of the antenna ports of in each node are connected to a power combiner and fed through the enclosure access port to the outside SMA connector which is wired to one of the input/output ports of the [http://www.jfwindustries.com/documents/50PMA-012_specsheet.pdf RF Transceiver Test System] from [http://www.jfwindustries.com JFW Industries]. This configuration enables fairly tight control of RF attenuation matrix between the nodes. Four of the RF test system ports are shared between nodes and basestations (node1-1 and node1-2 are sharing their port with LTE baestations while node1-8 and node1-9 are sharing their ports with WiMAX basestations). The topology (including pairwise attenuation between ports and selection switches for node/basestation) is controlled through the [http://omf.mytestbed.net OMF] based [wiki:/Software/eAM/mInstr Instrumentation AM]. |
| | 5 | |
| | 6 | || [[Image(SB4.png, 700px, align=center)]] || [[Image(IMG_0376.jpg, 200px)]] || |
| | 7 | |
| | 8 | As can be seen in figure 1, there are a total of nine (9) input/output ports on the transceiver test system. The first 7 input/output ports are connected to nodes 1 thru 7, respectively while the 8th and 9th input/output ports are connect to either nodes 1-8 and 19 or the two Wimax base stations (BS1 and BS2). The selection of devices attached to ports 8 and 9 is controlled by the ''selDevice'' command of the [wiki:/Software/eAM/mInstr Instrumentation AM] service. |
| | 9 | |
| | 10 | || RF Test System Port || Attached device || |
| | 11 | || 1 || node1-1 || |
| | 12 | || 2 || node1-2 || |
| | 13 | || 3 || node1-3 || |
| | 14 | || 4 || node1-4 || |
| | 15 | || 5 || node1-5 || |
| | 16 | || 6 || node1-6 || |
| | 17 | || 7 || node1-7 || |
| | 18 | || 8 || node1-8 or wimax BS1 || |
| | 19 | || 9 || node1-9 or wimax BS2 || |
| | 20 | |
| | 21 | This configuration creates two distinct set of RF paths that are used to create various topologies. |
| | 22 | |
| | 23 | ===== Node to Node RF Path ===== |
| | 24 | |
| | 25 | s12 parameters taken with Agilent ENA RF Network Analyzer E5070; instrument dynamic range of 110 dB limits the accuracy of large attenuation results. |
| | 26 | |
| | 27 | [[Image(SB4-Equiv-WiFi.jpg)]] |
| | 28 | |
| | 29 | |
| | 30 | || [[Image(S12-A-24.jpg, 250px)]] || [[Image(S12-A-25.jpg, 250px)]] || [[Image(S12-A-52.jpg, 250px)]] || |
| | 31 | |
| | 32 | ===== Node to WiMAX basestation RF Path ===== |
| | 33 | |
| | 34 | [[Image(SB4-Equiv-WiMAX.jpg)]] |
| | 35 | |
| | 36 | [[Image(S12-B-25.jpg, 400px)]] |
