Triple Play is a multimedia service offered by network providers, telecommunication companies and cable and Internet providers. It is the bundled delivery of a telephone, television and Internet service, based on the Internet Protocol (IP) and using broadband networks.
The configuration of a suitable infrastructure is an essential building block for a multimedia future. Alongside the required active Triple Play components, suitable cabinets and enclosure systems are often relegated to the bottom of the pile. But they are a vital element, as they house the components and protect them from environmental influences as well as unauthorised access.
The data provided by a service provider needs to be transported to the customer reliably and with high quality. This is usually provided via glass fibre city network rings. At a central point, usually in the data centre of the service provider, the signals are fed into the city network through which they are distributed. Via further main and sub-distribution points the signals reach the customer, eg, company buildings, hospitals, hotels and homes. For all passive transfer points as well as for the installation of the Triple Play components at the service provider, Schroff offers an extensive range of appropriate cabinet and enclosure solutions.
Flexible cabinet platform
Within Triple Play networks various cabinet types are used (distribution, data and server cabinets) whether they are used in the data centre of a service provider, as distribution cabinet in a POP or as distributor in a building, office block or hospital. The flexible cabinet platform Varistar from Schroff covers all these applications. The cabinet consists of a frame, available in two versions, a variety of cover parts as well as an extensive range of assembly fittings and accessories. An appropriate cabinet can be easily configured for each requirement.
The two frame versions offered differ in their maximum static load bearing capacity, either to 400 kg (Slim-Line) or to 800 kg (Heavy-Duty). Additionally, the Slim-Line version is suitable for an ETSI assembly. The outer dimensions of both versions conform to the ETSI standard. All cover parts, such as doors, side and rear panels, top covers and base plates can be configured across both frame versions to achieve a continuous unified appearance. Dynamic tests for earthquake stability to Bellcore 4 certify global usability and the Varistar platform has been tested by independent laboratories in important areas such as EMC, stability, shock and vibration.
Orderly cable ducting
The cable management for the Varistar cabinet is demarcated into four clearly defined zones to facilitate optimal arrangement and fastening of all cable types:
* Zone 1 is located in front of the installed components in the 19-inch plane. Here the patch cables are led horizontally between the distribution fields.
* Zone 2 is located to the right and left next to the 19-inch plane. Here the patch cables are guided by vertical channels between the individual components.
* Zone 3 is located laterally behind the 19-inch plane. The data cables entering from the top cover or base plate are directed to the rear of the distribution fields.
* Zone 4, at the rear of the cabinet, acts as an alternative to Zone 3 in 600 mm wide cabinets or if the cabinet is not accessible from the rear due to its positioning. As a rule the Zone 4 openings in the top cover are used for active cooling with fans. This also is required when active components are installed in the cabinet.
Cooling of high performance systems
With the Varistar LHX 20, Schroff has developed a complete cabinet cooling system concept. This complete cabinet system is able to deal with an installed heat loss of 20 kW. The air/water heat exchanger is inserted as a complete module on the left or right inside the cabinet. The module consists of an independent enclosure, an air/water heat exchanger, a water droplet collector, six fans, a three-way valve, as well as an electronic control unit with operating and display elements. Through the side installation of the air/water heat exchanger the entire 19-inch plane is usable to its full height. With side-by-side cabinets it is possible to cool several cabinets with one air/water heat exchanger.
The heat exchanger is situated in a closed air circuit of the cabinet with an air volume capacity of up to 3000 m³/h. Air direction elements and six fans which are distributed over the height of the cabinet provide even cooling of all the installed components. The cool water circulates through the external water circuit of the heat exchanger, heats up and returns to the chiller, where it is cooled down again to the required pre-determined temperature. The temperature in the cabinet is controlled with microprocessors.
If people have their workspace in the vicinity of such systems, the noise level is also a deciding factor. The noise level generated by the use of cooling components should not be underestimated. Varistar LHX 20 with an 80% load will reach a level of only 50,7 dB(A) and 54,8 dB(A) with a 100% load, making the system suitable for use in an office environment. The legally determined limits are set at 55 dB(A) (DIN EN ISO 11650-1).
These cabinets can be optimally configured for the specific infrastructure components required eg, for main distributors at the roadside, main and sub-distributors in a residential building and small distributors in a residential building. When configured, they offer the ideal combination of low noise generation, ease of assembly and maintenance, and environmental protection to suit the application environment.
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