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2011-01-30 16:31
Today, the optical fiber is widely used in France, Europe and in the world. In France and Europe, we can mention the network that LDCOM comprises 11,000 km of fiber connecting 60 cities. By… Read More
2009-09-06 12:53
Today, the use of SONET and WDM multiply. Indeed, coupled use of these two technologies yields networks Optical integrating the strengths of SDH: transmission reliability and management band… Read More
2009-09-06 12:42
SDH allows the sky to achieve the alarm on the various equipment. These alarms correspond to different problems could exist on the equipment or connections. Major alarms are: • AU-AIS (… Read More
2009-09-02 23:55
Major equipment There are 4 main categories of equipment to make connections SDH: • Switch card: This card provides the functions of multiplexing and circulating traffic between line in… Read More
2009-09-02 01:35
The SONET frame is composed of 9 rows. The first three bytes of each row contain information synchronization and supervision. Similar to SDH, we find the principle of adaptation-related enca… Read More
2009-08-31 00:25
The hierarchy of the standard SDH corresponds to that of SONET for ATM interfaces. The hierarchy of flows is different on three continents (USA, EC, Japan) is a rate of 51.84 Mbps, which was… Read More
2009-08-31 00:23
To carry signals, using virtual containers (VC: Virtual Container). In the VC that are sections overload (POH: Path Overhead), which are used by pointers. The transport of containers on STM… Read More
2009-08-30 01:52
The arrival of SDH SDH offers significant advantages over the PDH. SDH based on a digital frame that provides high level, in addition to the top speed (higher than PDH): • Greater flexi… Read More
2009-08-23 01:23
1.To combine low-speed traffic streams onto high-capacity wavelengths 2.Improve bandwidth utilization 3.Optimize network throughput 4.Minimize the network cost (transmitter, receiver, fiber… Read More
2009-08-23 01:20
Traffic-grooming is a kind of multiplexing in optical signal by packing low speed traffic streams into higher-speed streams. There is a significant advantage to groom the traffic. 1.Reducti… Read More

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