Version 23 (modified by 13 years ago) ( diff ) | ,
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Table of Contents
SB4
As shown in Figure 1, sandbox 4 consists of 9 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. There are 8 nodal wireless devices (with Atheros 5000X mini-PCI card and Intel 6250 mini-PCIe 802.11/802.16); these 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.
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).
RF Matrix Port Attached device Additional fixed atten values (dB) 1 node1-1 20 2 node1-2 20 3 node1-3 25 4 node1-4 30 5 node1-5 20 6 node1-6 20 7 node1-7 20 8 node1-8 20 9 wimax BS 30*
Attenuation values between each RF attenuator port (ie. the eight (8) nodes and wimax BS) can be controlled individually with the following URL commands listed below.
- 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
- get - to get attenuation on a given pair of ports
$ wget -O status http://localhost:5052/instr/get?portA=1\&portB=8
- status - to get attenuation values on all port pairs
$ wget -O status http://localhost:5052/instr/status
Attachments (10)
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IMG_0376.jpg
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SB4 Photo
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SB4-Equiv-WiFi.jpg
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SB4 RF path enclosure-to-enclosure
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S12-A-24.jpg
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SB4 path A transfer - 2.4 GHz
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S12-A-25.jpg
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SB4 path A transfer - 2.5 GHz
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S12-A-52.jpg
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SB4 path A transfer - 5.2 GHz
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S12-B-25.jpg
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SB4 path B transfer - 2.5 GHz
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SB4-Equiv-WiMAX.jpg
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SB4 RF path enclosure-to-basestation
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SB4.jpg
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SB4 Block Diagram
- 50PMA-012_specsheet.pdf (22.1 KB ) - added by 5 years ago.
- SB4.png (207.8 KB ) - added by 5 years ago.
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