ilk

Try the UK ICO web site. There is a code of practice document there. You also need to ensure that you have consent, so check your signage. Ilkie

Typically drop-and-insert ring topologies use 2 fibre cores, although I have seen 4 core versions. Most of the major CCTV fibre transmission manufacturers have analogue and/or IP versions of this type of system. Try TKH Security Solutions, AMG, Comnet, IFS Interlogix,Moxa etc Ilkie

Yes there is, but the secret is in the network design and hardware specification. Network speed is only one consideration. Low latency networks rely on issues such a processing power of switches and workstations, encoder specification, transmission network design and issues such as multiple streaming (multicast will help here but brings additional challenges as not all network kit is able to cope). Always start with the network design including highest quality core switches and use name brand CCTV kit (Pelco, Bosch, Avigilon etc) Ilkie

What you require is specialist transcoding kit. Bosch have transcoding in some of their kit plus some of the next release of cameras can be set for low bandwidth. For very low bandwidth utilisation look at encoders from Digital Barriers (can stream real-time video over wireless networks at under 10 kbits per second) or Vemotion. This uses similar technology as used by the Television outside broadcast guys. Both are capable of transmitting video over very low bandwidths. Ilkie

To echo what Tom has indicated, the fact that there is little user/installer reviews should raise questions. Installations in the UK need to comply with the Data Protection Act (DPA) which require considerations of Operational Requirement, Privacy Impact Assessments, fit for purpose etc. Once you have an understanding of pixels on target (DODI), this will point you in the direction of the required technical specification and thus the design. Cyber security is growing issue (see DPA and latest advice from the security agencies) so this also needs to be considered in the selection of manufacturer and network design. Hope this helps

You are correct to say that that the trade is is complex. There are several skill sets that need to be mastered to enable a CCTV to be installed that is fit for purpose. Although technical understanding is important, the skills involved in in specifying and installing cabling and associated containment systems is critical. In addition CCTV is increasingly using radio, internet, computer networking and fibre optic cabling as well, so skills in this area are also important. Additional factors such as Health & Safety, building code compliance and local licencing requirements also require consideration. The design process of CCTV systems is key to delivery of images that meet the end users requirements, so understanding of operational requirement (OR), legislation, privacy, cyber security and DORI make the difference between cameras just installed or the successful presentation of usable evidence. I would suggest that the majority of CCTV systems installed fail to be designed properly and although they record images, do not meet the end user's requirements when it's most needed. Regards Ilkie

It looks like the most of the suppliers are office or IT distributors, although it looks like shi.com has a decent range of quality CCTV kit. Ilkie

You could use Bosch DIP 3000 NVRs with Bosch 16 channel encoders. The Bosch DIP 3000 comes with 32 channel licences and can be networked together as well as providing an incremental upgrade path to IP cameras. The use of Bosch IP cameras with Bosch NVRs can provide a point to point encryption capability to maximize cyber security. Also the Bosch IP camera connected to a Bosch NVR will also record the full range of meta data allowing the later use of intelligent (forensic) review functionality. Ilkie

Public space CCTV surveillance has been installed in the United Kingdom for many years and as such work has been carried out to provide guidance and a regulation for the use of CCTV as an ongoing process. Professionally, the consideration of use of CCTV and subsequent design of surveillance systems requires the consideration, generation and documentation of an Operational Requirement. (see the UK Government document https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/378443/28_09_CCTV_OR_Manual2835.pdf) This process has gone on to become be included in National & International standards and legislation for the use of CCTV. The current version is part of the British Standards (see https://www.gov.uk/guidance/recommended-standards-for-the-cctv-industry) and will be included at the European level as well. There are a number of more technical documentation published by the BSIA – British Security Industry Association (see http://www.bsia.co.uk/publications/publications-search-results.aspx?PgrID=1206&PageID=1&PID=1206&evl=0&CategoryID=5&CategoryName=CCTV) The analogue video categorisation of screen height (1.6m) target image size of requirements to monitor (5%), detect (10%), observe (25%), recognise (50%) and identify (100%) have now being replaced for IP video with pixels on target (DORI) of Detect 25 px/m (8 px/ft), Observe 63 px/m (19 px/ft), Recognise 125 px/m (38 px/ft) and Identify 250 px/m (76 px/ft) Hope this helps Ilkie

Also consider if the kit you use will be supportable (or even available) after 7 years - that also goes for the codec used. Depending on which country you are in, there may also be regulatory issues (now or in the future). Ilkie

There are specialist systems that monitor available bandwidth in real time and dynamically adjust resolution to match via a transcoder. Vemotion is one such system. Ilkie

There are a number of strategies that can be used, including reviewing the design to reduce critical points of failure, duplication of camera views, protection of mains power, consideration (risk assessment) of internal or external attack, on-site spares holding, resident engineer, etc Ilkie resident engineer is all the time there so in case if cctv turned off? what are the best companies that can install cameras? for example if American Embassy install cameras, do they do bidding? or just only they pick one company for all their embassies?? and finally please what did you mean by duplication of camera views? if you can mention if there are other startegic ? thank you Duplication of view means that in very high risk areas (for example a front door or a safe) two cameras would be used to look at the same area or view. Each camera would be connected to a different network switch and then onto a separate recorder (that is two cameras, two network switches, two separate cable routes and two NVRs) so if one fails, the second will always maintain a recording of the area. This is called redundancy and there can be many layers depending on risk (and budget) Ilkie

Why don't you use fibre then? Guaranteed interference free (both ways). Ilkie Have been thinking about that too, but haven't researched it. A a fiber-optic cable between the camera aperture and the lens. No metal. Got any links? But I still need to find some RG59 Siamese. The fibre optic cable provides the IP connectivity from the camera to the network switch. Can buy pre-made terminated fibre cables, the use of which would depend on the cable pull. You would need to use media convertors (for example google comnet, there are other manufacturers) that offer 100BaseT or Gigabit. You many cameras can use the same circuit so you can use the fibre circuit as back bone home run. Ilkie

Why don't you use fibre then? Guaranteed interference free (both ways). Ilkie

There are a number of strategies that can be used, including reviewing the design to reduce critical points of failure, duplication of camera views, protection of mains power, consideration (risk assessment) of internal or external attack, on-site spares holding, resident engineer, etc Ilkie