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I have two devices which need to be powered up by -48V DC power. One device has two components IDU and ODU (microwave equipment) the combined power consumption is 40.5 Watt(18.5+22), the second equipment has power consumption of 60Watt (multiplexer). The rectifier also has to charge the batteries for backup.

What will be the rating of the rectifier i should use? also if i need backup of 4 hours what will be the rating of the battery?
Also it will be very helpful if someone can recommend some book or pdf for better understand the power concepts.. like what if i have to make the same calculations for AC power..
Can you mention the required rectifier without battery backup.
If we take battery backup into calculations the backup time required will be 4 hours and recharge time will be 10 hours.

Comparaison de la qualité du son avec celle de la TV par satellite

Un petit zapping

Démarrage de la STB et liste des chaînes de télévision au 29 septembre 2007

Saudi Telecom Company, STC (Arabic: شركة الاتصالات السعودية‎) is a Saudi Arabia-based telecommunications company that offers landline, mobile and Internet services. STC (Saudi Telecom) is the nati… Saudi Telecom Company, STC (Arabic: شركة الاتصالات السعودية‎) is a Saudi Arabia-based telecommunications company that offers landline, mobile and Internet services. STC (Saudi Telecom) is the national telecommunications services provider in the Kingdom of Saudi Arabia with a workforce of more than 21000 employees servicing their customers. Supported by the largest infrastructure in the Middle East. STC provides four key services: (A) Home services, which includes PSTN, broadband DSL; (B) Personal services, which includes mobile telephone services, and value added services; (C) Enterprise, which provides advanced business data solutions provider; (D) Wholesale, provides network services to other local operators. In the recent years STC grew beyond its local borders and went global forming a network of business and investments in various Gulf countries, Asia, and Africa. The Company is present in Kuwait, Bahrain, India, Indonesia, Malaysia, Turkey, and South Africa enabling it to provide services to a bigger customer base and increasing its total number of customers externally by studying and evaluating investment opportunities. Reflecting its strong financial position, Saudi Telecom Company was rated for the first time by Standard & Poor’s Ratings Service and Moody’s Investors …

www.enhancelearning.co.in Challenge: TATA Telecom required an end-user guide to explain the usage and features of their EPABX to their Definity customers. They wanted an easy-to-understand comprehensive resource which could be distributed to the users. Solution: We developed an interactive multimedia CD-ROM which was a comprehensive user guide for the EPABX. It contained precise information about operating the EPABX. We used compelling animations, click and learn graphics and step-by-step instructions to help the user master using the EPABX.

Saudi Telecom Company, STC (Arabic: شركة الاتصالات السعودية‎) is a Saudi Arabia-based telecommunications company that offers landline, mobile and Internet services. STC (Saudi Telecom) is the national telecommunications services provider in the Kingdom of Saudi Arabia with a workforce of more than 21000 employees servicing their customers. Supported by the largest infrastructure in the Middle East. STC provides four key services: (A) Home services, which includes PSTN, broadband DSL; (B) Personal services, which includes mobile telephone services, and value added services; (C) Enterprise, which provides advanced business data solutions provider; (D) Wholesale, provides network services to other local operators. In the recent years STC grew beyond its local borders and went global forming a network of business and investments in various Gulf countries, Asia, and Africa. The Company is present in Kuwait, Bahrain, India, Indonesia, Malaysia, Turkey, and South Africa enabling it to provide services to a bigger customer base and increasing its total number of customers externally by studying and evaluating investment opportunities. Reflecting its strong financial position, Saudi Telecom Company was rated for the first time by Standard & Poor’s Ratings Service and Moody’s Investors Service. The rating initiative gives STC access to international markets for its financing needs and significantly raises the level of confidence for its stakeholders, including investors and …

TITLE: Fundamentals of Telecom 1 – Overview COMPANY: Teracom Training Institute www.teracomtraining.com DATE May 15 2007 TYPE: Tutorial, DVD URL: www.teracomtraining.com It all starts with the Public Switched Telephone Network (PSTN) and Plain Ordinary Telephone Service (POTS). We’ll begin with the basics of telephony: loops, trunks, circuits, analog, the voiceband… fundamentals that are key to understanding of newer technologies and services. To complete the picture, we take a practical journey through different types of equipment. We’ll review switches, pbxs, Centrex, multiplexers and routers, as well as ancillary equipment like acds, voice mail and interactive voice response (IVR) systems. With this framework in place, we’ll review the telecommunications industry and understand the main players and competitors, how Local Exchange Carriers connect to Inter-Exchange Carriers and how clecs fit into the picture. The topics in this video course – how the telephone system and industry work, provide the essential foundation on which everything else, including digital communications, data circuits and networking are built. 2 hours 22 minutes of career- and productivity-enhancing training! Many people tell us this is training they wish they’d had years ago. Course outline – V1: Fundamentals of Telecom 1 Length 142 minutes. DVD-R NTSC format. 55-page 8.5″ x 11″ softcover bound workbook. Production year 2006. Part 1 Fundamentals of Telephony 1.03 The Public Switched Telephone …

I have been in Telecommunications for about 10 years. I have experience in several areas including PBX, Voice Switching, Voice Mail, and Telephony install and repair. I am open to suggestions. Thanks

Where will I get the Russia Federation’s telecom subscriber base figures whichever latest by Mobile, Fixed telephony and Broadband? Please send us the web site name or related info ?