Broadband Telecommunications Handbook 2nd edition 2002 by Regis "Bud" J. Bates;

By Regis "Bud" J. Bates;

Broadband telecommunications, the supply of lightning quick net entry to the house or place of work, is a box complicated, competing applied sciences: DSL, cable, instant, optical, and lots of extra. This ebook breaks down every one broadband expertise and explains it by way of functionality, asking Bates’ three Questions: what's it, what's going to it do for me, and what's it going to price me?

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We can outsource the whole network, including the VPN equipment on each site, or outsource pieces. Standard Outsourcing Issues A few points are worth making about outsourcing. One must take a realistic look at the task at hand: 29 • If the internal staff possesses the capability to implement the VPN, do they have the time? • If you outsource the whole network, how permanent will the relationship be? • To what extent will the internal staff become involved in the design and maintenance of the VPN?

Packet Level Authentication The IPSec standard provides for packet level authentication to prevent man−in−the−middle attacks. ) IPSec is a layer 3 protocol that enhances the use of the layer 2 underlying 35 protocols. An authentication header is created for each packet. The layman's version of this is that a checksum is calculated and encrypted with the data. If the checksum calculated by the recipient doesn't match the one sent by the originator, someone has tampered with the data. The IPSec standard specifies two different algorithms for doing this MD−5 and SHA−1.

Often these networks employ a mix of technologies, such as private microwaves, satellite communications, fiber optics, and infrared transmission. The convergence of the networks has further been deployed because of the mix of services that the telephone companies did not service well. Many companies with private networks have been subjected to criticisms because the networks were misunderstood. Often the networks were based on voice savings and could not be justified. Now that the telecommunications networks and systems are merging, the demand for higher speed and more availability is driving either a private network or a hybrid.

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