There are many devices inside the shelter. If I specify in TOTAL E & P backbone equipment, I’ll find ALCATEL 9400 LX microwave radio, New Bridge 3600 Mainstreet (multiplexer), SAGEM multiplexer (some of them), power panel, and GSM radios.
Aproximately, inside the building, i can figure it below:
Then How do they work?
The technology that is recently utilized in TOTAL is PDH (Plesiochrounous Digital Hierarchy), with 34Mbps capacity, or you can say it, 16E1. Radio will interface in each link and work point to point.
Theoriticaly, PDH is the first standardized digital higher-order transmission hierarchy from ITU-T (CCITT, at that time). The higher-order multiplexers of PDH are allowed to operate according to their own independent clock frequencies. Then there are two versions of PDH, European and American versions. The multiplexed stage details are shown below.
TOTAL use ALCATEL 9400 LX in this system. And as long as ALCATEL devices is used for 10 years, there are no important trouble. But, because POSTEL regulation and regeneration, TOTAL has to replace its devices with new one. THen, (project still in progress), Total changes its technology from PDH to SDH.
How SDH works?
To be continued.
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