octoBox product presentation

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Information about octoBox product presentation

Published on February 18, 2014

Author: mlinarsky



octoBox small anechoic chamber is a modern building block for laboratory wireless testbeds. It is used to build testbeds for testing MIMO OTA throughput, mesh networks and roaming. New 802.11ac devices can reliably achieve the fastest data rate of 1.3 Gbps (MCS-9) inside the octoBox specially designed environment.

February 2014

2 octoBox Stackable - Competitive Summary • Modern design optimized for wireless test applications • Stable and repeatable overthe-air coupling for testing devices with internal antennas • 700 MHz to 6 GHz • Easy interconnections among multiple boxes and multiple stacks CONFIDENTIAL

3 octoBox Mirror-image architecture Allows for neat interconnections among a multitude of anechoic enclosures CONFIDENTIAL

4 octoBox quadStack and triStack Dimensions 25.2” 26.35” 38.35” 18” 31.2” 42” 30.5” 24” 6’6” 34” 28.5” octoBox-26L quadStack CONFIDENTIAL octoBox-38L triStack

5 octoBox External and Internal Dimensions octoBox-26L 25.2” 26.35” 18” CONFIDENTIAL octoBox-38L 38.35” 31.2” 24”

6 Isolation and Filtering • Creating controlled RF conditions with good isolation is challenging, particularly for large-scale RF test setups, such as mesh configurations. Short wavelength high frequency signals couple via many paths, including copper cabling, poor/aging gasketing, ground loops, etc. Sources of interference may be difficult to locate in a multi-box setup. • Isolation considerations Isolation should be measured and specified with a fully cabled test setup. All copper cabling, including Ethernet and power cabling, will act as antennas contributing to RF coupling among enclosures and thus limiting attenuation range setting. Upfront investment into high grade enclosures with good data and power feedthrough filtering and absorptive foam can save 1-2 months of chasing uncontrolled paths of interference in the test setup. CONFIDENTIAL octoBox modular feed-through filter (inside face) This one is configured with 2 USB and 2 Ethernet ports


8 Single Box Shipping Package Rubber feet assembly AC Power entry Filter inputs Fan CONFIDENTIAL

9 octoBox MPE Testbed • The octoBox MPE testbed ships assembled and ready to us in a crate • The crate door also acts as a ramp, making it easy to wheel the system out and get started octoBox-38 MPE Stack CONFIDENTIAL

10 Optional RF Module Programmable attenuators, combiners, etc. CONFIDENTIAL

11 Inside View – Smartphone DUT CONFIDENTIAL


13 Introduction - Multipath Emulator • Wi-Fi manufacturers and evaluators test throughput performance in open air ‘real-life’ environment (e.g. a typical house or office) or using channel emulators. • octoScope has developed an octoBoxTM based testbed that creates multipath closely approaching the IEEE 802.11n/ac Models B or C [1], emulating home and small office environment. • octoBox MPE (multipath emulator) creates multipath inside octoBox small anechoic chamber by generating reflections with stubs of coaxial cable. A quad multipath emulator fixture supports up to 4-stream MIMO. • octoBox-MPE has been simulated, prototyped, measured and compared to the IEEE models. • Data throughput tests have been performed by on a 2x2 and a 3x3 802.11ac MIMO configuration demonstrating MIMO gains inside octoBox with equivalent or higher throughput to that measured in a representative home environment. • Patents pending See test results at this link: CONFIDENTIAL octoBox-MPE module (stacked in the middle) emulates IEEE 802.11n/ac Models B or C [1] corresponding to home and small office environment.

14 octoBox-MPE MIMO OTA Testbed Diagram Test Antennas Traffic TX/RX Ethernet Filter DUT AP Multipath segment Attenuators Remote Desktop Ethernet Filter Master Client octoBox octoBox-26 MPE Stack OTA = over the air CONFIDENTIAL

15 Measured Frequency Response 2.4 GHz band 5 GHz band CONFIDENTIAL Background

16 Internal View of Antenna Mounting MIMO antenna spacing controls correlation CONFIDENTIAL

17 octoBox-MPE vs. Conventional Fader octoBox-MPE Multipath fading Y Conventional Fader Y Doppler fading Y Time variable fading Y Channel model programmability Several fixed channel model modules can be stacked Y Channel modeling capabilities Up to 4 clusters, up to ~200 meter distance for reflections All standards based models and custom models Frequency range Up to 6 GHz, and higher 400 MHz – 6 GHz Channel width Flexible, 160 MHz supported 100 MHz Bi-directional Over the air (OTA) Y May require custom channel models, power amplifiers, etc. CONFIDENTIAL

18 Antenna Mounting System What’s important for near-field metrics is OTA coupling stability. octoBox antenna mounting system octoBox offers unparalleled flexibility in mounting test antennas for OTA coupling stability. And it also enables simultaneous measurements of multiple radios in the DUT. CONFIDENTIAL

19 octoBox Antenna Arrangement for Smartphones GPS antenna 1573.42; 1575.42; 1577.42 MHz 704-787 MHz 824-960 MHz 1575.42 MHz 1710-1990 MHz 2110-2170 MHz 2496-2700 MHz octoBox plastic rail and DUT shelf system 2G/3G/LTE antenna iPhone DUT Dual-band Wi-Fi/Bluetooth Antenna More antennas can be added for MIMO testing This configuration supports the iPhone and most other smartphones and pads on the market CONFIDENTIAL

20 octoBox-26 Internal View GPS antenna Filtered USB Filtered Ethernet DUT shelf Wi-Fi antenna Cellular antenna 13.35” Plastic rails and shelf CONFIDENTIAL


22 octoBox-38L Internal View Filtered vents Filtered Ethernet GPS antenna Wi-Fi antenna RF ports Cellular antenna Filtered USB Filtered AC DUT (Wi-Fi router) DUT shelf CONFIDENTIAL

23 Isolation and Absorption • Superior isolation and absorption support over the air coupling and ensure robust operating margin for conducted coupling of RF signal • Isolation Allows accurate path loss setting Prevents errors caused by ambient noise and crosstalk • Absorption >20 dB achieved using gradient absorptive foam Eliminates standing waves that cause nulls in the signal Improves overall isolation of the enclosure Standing waves create fluctuations in the signal 2.25” gradient absorptive foam covers inside surfaces Dual gasketing and right angle door seals CONFIDENTIAL Gradient absorber matches impedance of metal to air

24 Controlled Environment Test Signal coupled via cabling (conducted) or over the air (OTA) Ethernet Feedthrough filters USB octoBox-26L small anechoic chamber RF isolation box Programmable attenuator Distance and motion emulated using a programmable attenuator to model path loss (flat fading) or a channel emulator to model multipath and Doppler fading CONFIDENTIAL Master and DUT are isolated from each other to achieve wide dynamic range of the measurement by eliminating crosstalk

25 Wi-Fi DUT’s data rate adaptation behavior vs. RSSI all the way down to the RSSI level of -95 dBm. Data rate adaptation vs. Measured DUT RSSI is less than -95 dBm. This means Master to RSSI DUT coupling of less than -100 dBm. Controlled Environment Measurement Example Noise, interference and Master to DUT coupling must be well below intended signal level at DUT for metrics such as rate/MCS adaptation or roaming performance 802.11b (DSSS-CCK) – 1, 2, 5.5, 11 Mbps; 2.4 GHz 802.11a (OFDM) – 6, 9, 12, 18, 24, 36, 48, 54 Mbps; 5 GHz 802.11g – both 11b and 11a rates; 2.4 GHz 802.11n – up to 600 Mbps; 2.4 and 5 GHz MCS = modulation coding scheme DUT = device under test CONFIDENTIAL

26 Basic Radio Performance Tests • RX sensitivity • TX spectrum, EVM • Range • Adaptive Modulation • Roaming behavior • Performance in the presence of noise and interference Master Isolation box Noise/interference generator Variable RF attenuator RF combiner DUT DUT = device under test EVM = error vector magnitude CONFIDENTIAL

27 Roaming Test CONFIDENTIAL

28 octoBox Roaming Test Configuration RF attenuators Controller or Ethernet switch octoBox-26L Stackable Traffic source/sink Ethernet AP1 RF port ATTEN1 Spare combiner ports for connecting a sniffer AP2 ATTEN2 1:4 RF combiner Traffic source/sink Client/bridge under test Feed-through Ethernet filters octoBox-26L Stackable CONFIDENTIAL USB

29 octoBox Roaming Test Script Programmable attenuator ramp Ping requestresponse delay Connection outage due to roaming CONFIDENTIAL

30 dB above noise Roaming Results - Details from Sniffer Wireshark Sniffer AirPcap Nx USB dongles 50 45 40 35 30 25 20 15 10 5 0 RSSI 61:30 RSSI 5a:f0 ping requests ping replies deassociate deauthenticate authenticate assoc req-resp 9.04 sec 6.63 sec 3.16 sec 0 2 4 6 8 10 12 14 Seconds Last ping response: 3.16 sec Association: 6.63 sec First ping response: 9.04 sec CONFIDENTIAL

31 Wireless Mesh Test CONFIDENTIAL

32 Wireless Mesh Testing Wireless Mesh Metrics • • • • • Self-healing, self-forming Throughput, QoS vs. hops Throughput, QoS vs. range Routing efficiency Dealing with interference Multi-radio mesh nodes can communicate on different channels with multiple neighbors simultaneously. In a single-channel mesh throughput is cut in half at each hop. CONFIDENTIAL

33 Wireless Mesh Test Configuration Maximize attenuators to force auto-rerouting of traffic flow to test self-healing 1 RF splitters used to direct signal to multiple neighboring devices Nodes are in octoBox isolation chambers Fixed attenuators to set traffic flow via one branch or another to test self configuration octoBox quadStack isolation enclosures with built-in RF combiners and attenuators CONFIDENTIAL

34 octoBox Design Details Bulkhead SMA RF ports Mounting for optional RF combiner-attenuator module Programmable attenuators CONFIDENTIAL RF splitter Protective shroud Fixed attenuators

35 Wireless Mesh Testing - Example PC in open air #2 Console Antenna #2 bc:77:37:ab:33:5d bc:77:37:ab:33:5d #1 94:39:e5:01:3d:62 94:39:e5:01:68:ed USB cable going through data filter to control Pingblaster running on #3 #3 RF Attenuator octoBox RF Switch #1 #3 Ping request response traffic 94:39:e5:01:3d:62 CONFIDENTIAL RF Combiner octoBox lower chamber #3 #2 94:39:e5:01:68:ed octoBox upper chamber #1

36 Delay Through Mesh bc:77:37:ab:33:5d Ping round trip delay (ms) 94:39:e5:01:3d:62 One hop 94:39:e5:01:68:ed ~ 12 msec delay with bursts of long delays (>1 seconds) ~ 2 msec delay Seconds bc:77:37:ab:33:5d 94:39:e5:01:3d:62 Zero hops CONFIDENTIAL 94:39:e5:01:68:ed BATMAN = better approach to mobile ad hoc networking

37 Connected Car DSRC Test DSRC = direct short range communications CONFIDENTIAL

38 Connected Car Testbed – Large Intersection Emulate groups of connected vehicles traveling over a busy highway interchange CONFIDENTIAL

39 Example Large-scale DSRC Testbed DSRC testbed emulates motion of groups of cars with respect to other groups Up to 24 radio modules in each chamber 192 radios in the testbed 8-port wireless channel emulator Motion Multipath Noise octoBox quadStack CONFIDENTIAL

40 Example: 3” x 5” x 1” DSRC DUT Test antennas DUTs Ethernet hub Layers of absorptive foam (not shown) separating DUTs horizontally and vertically providing 10 dB of isolation per layer CONFIDENTIAL DSRC = direct short range communications

41 Channel Emulator to Emulate Road g Car 2 Car 1 radio Car 2 radio octoBox RF anechoic chambers CONFIDENTIAL Multipath fading Shadow fading Doppler fading Wireless channel emulator Signal amplitude at car 2 Car 1 Slow shadow fade due to truck passing through signal path between 2 cars Time

42 Specifications Feature Specification AC power entry module IEC-320 C14 inlet connector 120/240VAC 50/60Hz with 6A 5x20mm fuse Cooling 80mm square axial fan Filters over inlet and outlet for isolation Filtered high speed data gigEthernet (with PoE), USB, HDMI, DB9, DB25 or DC connections power ports RF ports 8 RF barrel connector ports Isolation >80 dB, fully cabled setup, up to 6 GHz Absorption >20 dB from 1.3 to 40 GHz; >15 dB down to 700 MHz CONFIDENTIAL

43 Dimensions and Weight American Metric Outside: 18”H x 26.35”W x 25.2”D (-26 model) 24” H x 38.35”W x 31.2”D (-38 model) Outside: 45.7cm H x 67cm W x 64cm D (-26) 61cm H x 97 cm W x 79cm D (-38) Inside: Inside: 13.35”H x 19.35”W x 13.35”D (-26 model) 34cm H x 49cm W x 34cm D (-26) 19.35”H x 31.5”W x 21. 5”D (-38 model) 49cm H x 80cm W x 54.6cm D (-38) Weight: 95 LBS (-26 model) 172 LBS (-38 model) CONFIDENTIAL Weight: 43 kg (-26 model) 78 kg (-38 model)

44 octoBox Stackable – Feature Summary • Robust stackable design with support for over the air RF signal coupling • Optional built-in RF combiner-attenuator module Inside and outside mounting options • Plastic (RF-transparent) mounting for test fixturing e.g. shelves, RF combiners, RF attenuators, etc. • Base with casters for easy moving – with locking breaks • • Filtered vents for cooling • Filtered high-speed data ports Power entry module with integrated filter, fuse and switch Ethernet, USB, serial Gigabit Ethernet and PoE support CONFIDENTIAL

45 • View octoBox information • • View our publications, including articles, white papers, test reports and online tutorials • • Contact +1.978.222.3114 Thank you! CONFIDENTIAL

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