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July 2010 |
Many schools have deployed wireless to extend the reach of the local area network to cover open fields or playgrounds on the campus. This type of equipment is called Access Point which acts as a hub for various teachers and students in a circle of area to be connected. Can we use the same for IPVS? The blunt answer is negative. Can we use wireless for IPVS? Yes this time.
When used for an IP based video surveillance system, we deploy wireless for a similar but not the same reason. That is, we deploy wireless to extend the distance of signal forwarding but not for reception or emission of signals. Take the open playfield as an example. The far end of the playfield is about 500 metres away from the nearest school block with data cabling. We can install a camera there, connect it to a wireless bridge and use it to beam the video signals back to the school block. We need a pair of them to form a bridge. This arrangement should be more economical than laying a cable across an open space of 500M or 5KM.
Since video requires a lot of bandwidth, will wireless cope? Yes if we choose the correct equipment. Compucon is related to an international wireless consultant and this consultant has commissioned a test over a straight line spatial distance of 1.7KM in Taiwan. The test obtained 81Mbps of effective traffic which is higher than a standard LAN cable (100Mbps type gives about 60Mbps effectively). The editor has been involved in this wireless project for several months and has written a tutorial to explain the technology in very simple layman terms. Please obtain a copy of the tutorial there if you are interested.
http://www.compucon.co.nz/content/view/694/46/
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July 2010 |
This article is supplied originally by Karen of Blomfield Special and Michael of Pompallier Collage. Karen attended a seminar in Australia recently and sent an article to Michael who forwarded it to the editor of this newsletter.
The article is timely as the video surveillance industry is transitioning from an analogue technology base to a digital one. To be precise, the technology is transitioning to Internet Protocol based and thus we have the term IPVS for Internet Protocol Video Surveillance.
The Australian article is about the installation of a new IPVS system in a 1600 pupil school in Canberra which produced some intended as well as unintended results. It is the second system attempt of the school after the first one based on analogue has proven to be unfit for purpose. Intended results include a major reduction of security and misbehaviour incidences and a faster incidence resolution process. Unintended results include the silent acceptance by students of being watched. The school expressed full satisfaction with the installation.
The editor of this newsletter has noted a few things that can be improved. The school used standard resolution cameras and not megapixel that IP cameras are capable of to give clearer videos. The cameras recorded at 5 frames per second when they are capable of higher rates. Also the recordings were done in 5 different devices geographically scattered. The fact that the school is pleased, despite the 3 points above, indicates there are more advantages offered by IPVS over analogue. In short, it is the IP nature of integrating with the school LAN. All school IT administrators will concur.
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July 2010 |
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As from 20 July 2010, Joseph will become your first point of contact in TSD for technical support services. Joseph is in his early twenties and he joined us in May after emerging as the winner of 130 applicants. He showed his focus in taking 9 weeks to complete an ISO-9000 based induction and competence training program which is designed for 13 weeks. You may think he is a smart fellow. True but more true is his good work attitude. Being fresh on the horizon, Joseph does not know more than he knows, however he will learn, work hard and try his best to serve you in an efficient manner. Please be patient with Joseph in return.
Rayson will get married soon. He will take time off to look around the world and then decide what to do next. We wish Rayson happiness and all the best for his future.
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July 2010 |
We have dug deeper into our TSD service database and have identified 3 Seagate NS models with the highest failure rates of all. These 3 models accounted for 43% of all HDD failures reported to us including 14% of incidences which were confirmed to be false alarms.
We were hesitant with Western Digital as a replacement due to some recent experiences but have found comfort in its Enterprise Series designed for RAID and server use. WD claim that these drives were all pre-tested through an extended burn-in process. Such being the case, we will offer WD Caviar RE3 or RE4 models in lieu of Seagate NS for 250GB, 500GB and 1TB SATA models.
We are not abandoning Seagate or going for the full range of WD drives at this stage. This implies some systems may have a mix of Seagate and WD and this is something we have to pay attention to. The extra efforts should see a reduction of HDD failure rates and thus an improvement of life for all of us.
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July 2010 |
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Tandberg Data is a global supplier of data protection solutions for SMB that include disk-based storage, tape drives, autoloaders, libraries, media and de-duplication software. Among various products mentioned, Paul will touch on two specifically.
(a) LTO-5 drive is capable of storing up to 1.5TB of native data on a single cartridge in less than 3 hours. LTO hardware encryption provides a safe and secure means of transporting data for offsite storage.
(b) AccuGuard data protection software delivers reliable, automated backup and recovery utilizing a powerful data de-duplication engine designed to increase the effective storage capacity by as much as 20 times (we will ask Paul for substantiation). AccuGuard intelligently optimizes the data at the source resulting in drastically improved backup windows and network bandwidth.
Paul is based in Sydney and takes care of Australia and New Zealand for Tandberg Data.
See this http://www.compucon.co.nz/content/view/699/147/
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