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The 2010 map of MYREN seen below may help in understanding the routing. However, the UNIMAS links is here reported at 10Mbps, whereas it is 100Mbps. Also Sabah, Bintulu, Sibu don't show up in the map.
Fibre Optic cables
Sacofa (Sarawak Common Communications Facilities) is responsible for establishing the first physical communications link between peninsular Malaysia and East Malaysia with its submarine fibre-optic cable running from Mersing in Johor to Sarawak.owns & operates an extensive on-land fibre network within Sarawak as well as an optical fibre submarine cable system connecting Sarawak and Peninsular Malaysia. They have five Operation & Maintenance Centres in Kuching, Sibu, Bintulu, Miri & Mersing. More
There is (2011) a proposed link between Sarawak’s capital Kuching and Indonesia’s Pontianak . Ther Government Linked Company (GLC) of Sarcofa ,which celebrates 10 years in 2011, enjoys fibre network connectivity with Brunei and an underwater cable system to Mersing, Johor on the west coast of peninsular Malaysia.
Submarine Fiber Optic Cable which provide backbone connectivity between Labuan to Sabah, Sarawak and Peninsular Malaysia with total bandwith of 110Gbps. Two ground satellites which facilitate as a restoration during submarine cable failure. Labuan is connected to 23 countries via International Toll Free Services. More