From Johari
TM and jaring are two separate ISP in Malaysia, whereas MYREN is specifically a research network.
For example, in UNIMAS, we have all three connection:
Initailly, UNIMAS is connected through JARING (not really sure what is the connection speed, will get the info), then UNIMAS added another connection using TM. Currently both conection is still used in UNIMAS.
UNIMAS also connected to MYREN (a totally separate connection), but the MYREN connection is only applicable to specific data transfer (No Internet, etc)