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Nothing New

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Submitted By plabishka
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After visiting form Grameenphone Ltd. we the students of the course EEE 412 (Mobile satellite communication) got the chance to visit BTCL(Bangladesh Telecommunications Company Ltd). it was arranged by our respected faculty Dr. Feroz Ahmed & IEEE student branch. Our respected faculty Dr. A K M Baki was also with us to assist. We were at Mohakhali Office (BTCL) where most of the topic covered was based on Microwave. The supervisor Engineer gives the idea as clear as possible at the given time. We only visit one connectivity room which is known as Mirroring Submarine Connectivity Room. This submarine cable is connected sequentially form Cox Bazar to Dhaka. The connectivity of this cable is shown below.

In BTCL there are 5 STM-64 are used with speed of 10GB/s for each of them. Among them four STM-64 are NORTEL-6500 company and one is KT company. DWDM scheme is used in SDH-MUX system which gives the output at 10 GB (Highest output is 100GB). Everyone have the particular wavelength with different color. Then these all wavelength are making together combine. So at last four pair cable are out from every MUX in NORTEL. The BTCL rent one extra cable from the PGC for protection of cable if any fault is creating. In this submarine connection CB4 is use which is also use by 14 countries. After Cox bazar this submarine cable is connected to Singapore in one side and UK in another side. This is also supply in different company as like as IIG (= International Internet Get way) and IGW (= Internet Get Way). The IP bandwidth is almost 25GB. In every STM-1 have 63 E1 carriers. For use E1 co-axial cable for data communication it should me make Ethernet. If it has optical port at that time it can be use directly. Two countries have the main Ethernet server. One is at Italy and another one is at Singapore. The SDH system can jump one E1 carrier to another E1 carrier. But STM cannot jump that way. It should follow a sequence 4, 8, 12, 16, 64. The internal components of NORTEL – 6500. It has E1 card (2), STM card, STM1 (2) – STM4 (2), STM16 (4), STM 64 (2). This NORTEL is also connected with an ODF HUB (NE-234). In BTCL the receiving power is 23dBm and transmission error comes after -28dBm. The selectivity of receiver is between -3dBm to -24dBm. In here there is no repeater or amplifier is needed because they use a system ADM (Add Drop MUX). There is another system known as STM – SFPL which make the optical data. It has two cables one is for transmission and another is for receiving. We also see the power meter. They also show their OTDR machine which detect the fault create in the optical fiber. By this machine we can easily detect the fiber fault. And then it can be easily replace.
The supervisor Engineer also mentioned us about the usefulness microwave, in situation when PGCB & any physical damage in submarine cable. The apparatus was pretty much up to date. We also seen some intelligent tools, which can detect the transmission power of any particular area. All In all it was a successful tour. We learnt a lot from this tour and hopefully it will help us in future. At the end I would also like to give a warm thanks to IEEE student branch for a nice treat.

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