讓香港學校成功找出適合的WIFI網絡品
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經過多年來和老師的接觸，我們有幸了解到學校在落實e-learning所面對的挑戰。每日面對龐大的工作，包括教學、行政、課外活動及不斷的教育改革，老師要做的還有是跟自己本科知識以外的專門工作。對於教育局於2010年開始接受學校提交e-learning報告書，讓討論多年的電子教學正式邁向一大步。
所謂電子教學，總離不開電腦，即是逃不過上網的要求。在電腦電子產品這個行業，價格每年都是往下調。反觀，香港人工每年都會上漲。所以對於安裝WiFi的成本，價格已經比以前的平宜很多。另一令老師有所懷疑的是網絡的維持費用，要支援一個課室40人同時上網，佈置的WiFi不應該考慮使用家用式技術的WiFi Router。如是者，IT技術人員或科主任可能先要對產品有一定程度的認識或專業資格。如選擇out-source，每年的維護費用也要計算在內。
一套已經證明可支援多班40人的同學同時上網的WiFi，而且已經運行了差不多２年。
學校位於住宅區之間，打開電腦作簡單scanning，不難搜尋到20個以上附近住戶的SSID。訊號干擾問題非常嚴重---- 這是其中一個令老師經常提出WiFi 能否足夠讓一班人使用問題的癥結之一。這涉及以下的幾個因素：
1. 對抗外來干擾 (external interference)
2. 同頻干擾 (self-interference)
2. 系統使用者容量 (capacity)
3. 系統提升 (scalability)
4. 移動時的穩定性 (mobility)
總結而言，讓多人同時上網的最佳方法就是要把AP安裝得密一些。正如在一所酒樓內，當每人都高聲說話，你不會聽到對方的內容。那麼何不在耳邊細細聲的說？？
Extricom Wireless 體驗及學校分享日 (School sharing on e-learning & Experiencing on Extricom Wireless)
活動：學與教博覽 2011 (Learning & Teaching Expo 2011)
地點: 香港灣仔會議展覽中心
日期：29/6/2011, S429, 1530-1630
講者: 溤耀章先生 救恩學校 助理校長
羅錦源先生 香港大學 - 電機電子工程系 互動學習項目助理經理
歐陽鎧恒先生 香港大學 - 電機電子工程系 知識交流技術主任
講題: 個案分享- 救恩學校 如何利用 資訊科技促進學習 x iClass互動教室示範
Abstract:
Kau Yan School have started e-learning and teaching since 2009. Starting from building a learning center, to deploying campus WiFi and iPads for easy internet access, the school aims at promoting self-learning through IT and the Internet. Besides, the EEE Department of HKU will demonstrate their iClass app for e-learning & m-learning. With the iClass app, students can interact with both teachers and classmates in real time. Attendants will have the opportunity to try out iClass on iPads over the Extrciom WLAN, and to learn about the advantage of the Interference-Free technology.
摘要:
救恩學校於2009 逐步實行電子教學，由建立Learning Center開始，到全校WiFi覆蓋及配備iPad等 先進設施，方便學生透過電腦及互聯網自行搜尋網上資源，鼓勵自學。另示範香港大學電機電子工程系研發程式的「互動教室」。iClass是一個融合電子學習與流動學習的教育系統 。教育工作者利用這個方便易用的軟件，通過iPhone/iPad/Android在課堂上營造互動。屆時會透過Extricom WLAN 和iPad示範iClass及了解Interference-Free 技術如何解決學校密集式上網需求。
Extricom Announces World’s First 802.11n 3-Stream Enterprise Access Point
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Extricom Continues To Lead The Way To Higher Bandwidth WLAN
October 7, 2010 - New York, NY - Extricom Ltd., a designer and manufacturer of high-performance, next generation wireless LAN (WLAN) infrastructure solutions, announced today that it will launch the world's first enterprise-grade 802.11n access point with 3 spatial streams, the EXRP-33n, at IPExpo, in London England, October 20-21.
Extricom's Channel Blanket™ is the perfect architecture to harness the power of 3x3 MIMO technology, and is particularly suited for deployments in bandwidth-intensive applications such as the education, medical, and general office verticals. The Channel BlanketTM eliminates the complex RF cell-planning normally required for 802.11n, and also eliminates the co-channel interference that can severely degrade 802.11n throughput. Consequently, Extricom customers already today realize the true potential of 802.11n technology and will continue to do so in 3-stream deployments.
Azalea Networks Is Now Part Of Aruba Networks
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ARUBA NETWORKS COMPLETES ACQUISITION OF AZALEA NETWORKS
Sunnyvale, CA, September 2, 2010 - Aruba Networks, Inc. (NASDAQ: ARUN), a global leader in distributed enterprise network solutions, today announced it has completed its acquisition of privately-held Azalea Networks, a leading supplier of outdoor mesh networks. The acquisition includes an operations center in Beijing which will complement Aruba's existing R&D centers in Bangalore and Silicon Valley.
Azalea Networks develops highly differentiated mesh products for critical outdoor industrial applications in the oil and gas, logistics, manufacturing, mining, petrochemical, public safety, smart grid and transportation sectors. These products will enable Aruba to deliver secure mobility solutions that span from indoor carpeted spaces to the outdoor industrial enterprise.
In a mesh network, data packets hop wirelessly from radio to radio. Azalea's innovative mesh technology allows it to also carry latency-sensitive video and voice traffic, with full fidelity, over long distances. The value of this capability has been field-proven in demanding applications like the 2008 Beijing Olympic Games, in which 600 mesh nodes provided voice, video, and Wi-Fi access over 19 square miles (50 square kilometers) of the city.
The Industry’s First Quad-Radio 802.11n Access Point, operating at Full Strength with Standard Power-over-Ethernet, Highlights Series of Technology Innovations
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New York and Tel Aviv, March 25, 2008 - Extricom, a leading provider of high-performance enterprise-class wireless solutions for converged voice (VoWLAN), data, video, and location-based services, today announced its new suite of 802.11n draft 2.0 compliant products. Extricom's fourth-generation solution is the only system to enable disruption-free introduction of full-performance 802.11n in the enterprise, for both the 2.4GHz and 5GHz Wi-Fi bands, at the lowest cost-per-port.
It has become clear that, in order to achieve the promise of greater bandwidth, all solutions announced to date impose three disruptive and expensive conditions on any 802.11n implementation: limit ‘N' devices to the 5GHz band, leave the 2.4GHz band only for legacy devices, and install costly non-standard power-over-Ethernet (PoE) schemes to meet the increased energy demands of 802.11n access points (APs). In stark contrast to this, the Extricom WLAN System, based on the unique Channel Blanket™ architecture, avoids the technical and deployment obstacles presented by all other vendor solutions.
EXSW-1600 Wireless Switch
The First Wireless Broadband Network with Full Network Intelligence.Azalea Networks delivers network intelligence to its broadband wireless infrastructure through an innovative wireless routing technology that sets new standards in price and performance. It’s the perfect solution for service providers, government agencies and industrial enterprises that need superior performance, scalable capacity, seamless mobility and more. It’s all made possible by intelligent network routing technology to deliver high quality wireless voice, video and data services.
Simpler. Better. Guaranteed.About Extricom Extricom is the award-winning Interference-FreeTM Wireless LAN System to deliver data, voice (VoWLAN) media and security. Unlike conventional WLAN, which is limited by its ability to adjust the channelization issues, delay-plagued AP-to-AP handoffs, and the upredictability of system brandwidth, Extricom ease these problems by inventing the concept of "Channel Blanket ". The Channel Blanket techology is based on a fully centralized WLAN artchitectures, in which the switch makes all of the decision of packet delivery on the wireless network. In this case, clients associate directly with the swtich, not with the APs. The AP acts as a "RF conduit" to rapidly funnel traffic between the clients and the switch. By deploying the APs in everywhere you need WiFi, Extricom allows the connectivity with predictable brandwidth by co-existenece of 802.11a/b/g/n channels on every APs. Application (voice, data, etc) is separated so as packet is deliveried under different physical layer.
Leapa @ICT Expo 2010
Tuesday, 16 March 2010 17:11 |
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Leapa will appear in the International ICT Expo 2010 at Hong Kong Convention and Exhibtion Center during 13-16, April. We will exhibit the most powerful wireless mesh technologies from Azalea Networks and the Interference-Freer WLAN system from Extricom. You are cordially invited to visit us at Booth No 3GC21.
INDRV 汽車保盒從即日起在全線電訊數碼門市有售
Wednesday, 28 July 2010 00:00 |
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萬眾期待的INDRV（恩達）汽車保盒從即日起在全線Telecom Digital（電訊數碼）門市有售。INDRV汽車保盒是目前最領先的行車記錄儀，其獨有前後雙鏡頭拍攝汽車內外情況，和特大雙USB儲存量。INDRV亦同時能夠監聽車廂，利用衛星定位記錄行車路徑及速度，和記錄三維重力及撞擊數據，確保駕駛行為正確和安全，避免意外後的紛爭。INDRV是唯一能夠密封記憶體的行車記錄儀，防止資料外洩或造假。 歡迎蒞臨電訊數碼各門市親身體驗（地址）：
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Azalea's Seamless Mobile Video Streaming TechnologyAzalea's innovative Active Video Transmission (AVT) solution is designed to remove impairments to video quality including jitter and packet loss, and dramatically improve the performance of video applications in a broadband wireless network infrastructure. Extricom In Action
Demo of the Extricom Wireless LAN system. Extricom delivers voice, data, video, and location services with a robust and mobile connection to any Wi-Fi client, in any environment. The Extricom system reduces wireless LAN complexity, delivers high performance with predictable service, works seamlessly with existing wired network infrastructure, and future proofs your network for tomorrow's multi-service demands. It is an IEEE 802.11-compliant solution, combined with Extricoms unique Channel Blanket™ architecture, that revolutionizes the Wi-Fi experience for both IT administrators and wireless users. Extricom product was mentioned in SMB World | |
Extricom 推出定制 802.11n 無線局域網系統Home » 中小企快訊 » Extricom 推出定制 802.11n 無線局域網系統
面向融合的語音 (VoWLAN)、資料、視頻和定位服務，提供高性能企業級無線解決方案的供應商Extricom，宣佈推出其新款符合802.11n草案2.0標準的系列產品。Extricom的第四代解決方案，標榜是唯一一個在不影響企業級802.11n全性能的前提下，以最低每埠成本推出的、面向2.4GHz 和5GHz Wi-Fi頻帶的系統。
see farther with Leapa ...Established in 2005, Leapa is a value-added distributor (VAD) of innovative wireless networking products. We pride ourselves on not being just another box-moving distributor. Leapa is an one-stop shop for products, knowledge and expert services needed to satisfy your customer's every need.
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