wiki:Hardware/bDomains/cSandboxes/dSB4

Version 18 (modified by nilanjan, 13 years ago) ( diff )

Table of Contents

    SB4

    As shown in Figure 1, sandbox 4 consists of 8 nodes and a WiMAX subsystem that consists of a basestation and a controller. To prevent interference, each node is housed in Ramsey Electronics RF enclosure that provides 80 dB of isolation. Nodal wireless devices (Atheros 5000X mini-PCI card and Intel 6250 mini-PCIe 802.11/802.16) 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 RF Transceiver Test System from JFW Industries. This configuration enables fairly tight control of RF attenuation matrix between the nodes. The topology is controlled through the OMF based Instrumentation AM.

    SB4 Block Diagram SB4 Photo

    RF Matrix Control Services

    This service controls the RF attenuator matrix. Since there are a total of nine (9) input/output ports on the attenuator matrix, the first 8 input/output ports are connected to nodes 1 thru 8, respectively. The 9th input/output port is connect to the Wimax base station (BS). So in a nutshell

    RF Matrix Port Attached device Additional attenuation values
    1 node1-1 *
    2 node1-2 *
    3 node1-3 *
    4 node1-4 *
    5 node1-5 *
    6 node1-6 *
    7 node1-7 *
    8 node1-8 *
    9 wimax BS *

    Attenuation values between the eight (8) nodes and the BS can be controlled individually with the following URL commands listed below.

    1. set - to set attenuation value on given port pairs (example portA=1 , portB=2, attenuation = 20)

    This would set the attenuation value between node1-1 and node1-2 to 20 dB.

    $ wget -O status http://localhost:5052/instr/set?portA=1\&portB=2\&att=20
    
    1. get - to get attenuation on a given pair of ports
    $ wget -O status http://localhost:5052/instr/get?portA=1\&portB=8
    
    1. status - to get attenuation values on all port pairs
    $ wget -O status http://localhost:5052/instr/status 
    

    Attachments (10)

    • IMG_0376.jpg (154.3 KB ) - added by seskar 13 years ago. SB4 Photo
    • SB4-Equiv-WiFi.jpg (27.4 KB ) - added by seskar 13 years ago. SB4 RF path enclosure-to-enclosure
    • S12-A-24.jpg (142.8 KB ) - added by seskar 13 years ago. SB4 path A transfer - 2.4 GHz
    • S12-A-25.jpg (166.3 KB ) - added by seskar 13 years ago. SB4 path A transfer - 2.5 GHz
    • S12-A-52.jpg (150.0 KB ) - added by seskar 13 years ago. SB4 path A transfer - 5.2 GHz
    • S12-B-25.jpg (113.7 KB ) - added by seskar 13 years ago. SB4 path B transfer - 2.5 GHz
    • SB4-Equiv-WiMAX.jpg (20.3 KB ) - added by seskar 13 years ago. SB4 RF path enclosure-to-basestation
    • SB4.jpg (124.4 KB ) - added by seskar 9 years ago. SB4 Block Diagram
    • 50PMA-012_specsheet.pdf (22.1 KB ) - added by jkol 5 years ago.
    • SB4.png (207.8 KB ) - added by jkol 5 years ago.

    Download all attachments as: .zip

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