Optical Networks - _1_5 Transparency and All-Optical Networks_14

Optical Networks - _1_5 Transparency and All-Optical Networks_14

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22 Introduction to Optical Networks 1.5 Transparency and All-Optical Networks A major feature of the lightpath service provided by second-generation networks is that this type of service can be transparent to the actual data being sent over the lightpath once it is set up. For instance, a certain maximum and minimum bit rate might be specified, and the service may accept data at any bit rate and any protocol format within these limits. It may also be able to carry analog data. Transparency in the network provides several advantages. An operator can pro- vide a variety of different services using a single infrastructure. We can think of this as service transparency. Second, the infrastructure is future-proof in that if protocols or bit rates change, the equipment deployed in the network is still likely to be able to support the new protocols and/or bit rates without requiring a complete overhaul of the entire network. This allows new services to be deployed efficiently and rapidly, while allowing legacy services to be carried as well. An example of a transparent network of this sort is the telephone network. Once a call is established in the telephone network, it provides 4 kHz of bandwidth over which a user can send a variety of different types of traffic such as voice, data, or fax. There is no question that transparency in the telephone network today has had a far-reaching impact on our lifestyles. Transparency has become a useful feature of
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This note was uploaded on 01/15/2011 for the course ECE 6543 taught by Professor Boussert during the Spring '09 term at Georgia Institute of Technology.

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Optical Networks - _1_5 Transparency and All-Optical Networks_14

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