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Kaustubh Katdare
Kaustubh Katdare • Dec 11, 2013

Submarine telecommunications cable data transfer capacities

Was reading about the i2i cable which runs 3200 km from Chennai to Singapore, owned by Airtel and will be shared by Reliance Jio. What astonished me was that the total data transfer capacity of the cable is about 8.4 Tbit per second. What allows such cables to have so big data carrying capacities? Special fibers? Or what?
The capacity of each cable depends on the planners and the company that owns the cable.If more amount of data is hoped to carry,then greater amounts of fiber is laid.Actually it depends on when they were laid,advancements in the type of cable,technology used in the amplifiers and other components installed along the path of the cable before it is laid into the ocean bed.

Such high data rates are possible because they use DWDM (Dense Wavelength Division Multiplexing ).Not all the cables supports such high rates.Theoretically since these i2i cables supports very high capacity,they are used.

For more details on DWDM here's a link https://en.m.wikipedia.org/wiki/Wavelength-division_multiplexing
Jeffrey Arulraj
Jeffrey Arulraj • Jan 10, 2014
One more thing mate. Such high speeds are delivered by cable clusters made by combining more than 8 optical cables in a single bundle,

One optical cable can't be used as a stand alone link between the two ports.

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