The cable that used by slt called SEA-ME-WE 4 (South East Asia-Middle East-West Europe 4)
http://en.wikipedia.org/wiki/SEA-ME-WE_4
has only a bandwidth of with a total capacity of 1.28 Tbit/s...
and that bandwidth from London is shared between telecommunications between Singapore, Malaysia, Thailand, Bangladesh, India, Sri Lanka, Pakistan, United Arab Emirates, Saudi Arabia, Sudan, Egypt, Italy, Tunisia, Algeria and France. as Weekipedia says..
Well Lankabell Has There Own
Majour Cable cost of US $ 27 million and a 3billion RS investment
http://www.lankanewspapers.com/news/2008/6/29165.html
and there cable is connected to the FLAG Cable System which is connected directly to 50countrys.. and Even USA and also linked to AT&T cables.. and this cable has a connection speed of 1.20 Tbit/s to Srilanka through the Lankabell network
http://en.wikipedia.org/wiki/Fiber-Optic_Link_Around_the_Globe
so simply Lankabell has More International Bandwidth Than SLT does..