how to use multipale bandwidth ?

i have a mikrotik router . i already using 10mb bandwidth from a ISP . now i took another 3mb bandwidth from a new ISP .now i want to use this bandwidth at the same time and want to serve it at office .
MY QUA: is this possible to use? if possible then then how it could be ? plz help me .

Yes. The search term you need is “bonding” . For example: http://wiki.mikrotik.com/wiki/Bonding

yes, but this is bonding between two MikroTik routers over ethernet and he is asking about bonding two DSL lines if I’m not mistaken

The LAN side of a DSL modem is an ethernet feed. Connecting two ethernet WAN feeds, through one router, to combine bandwidth, is bonding.

Now as fewi points out in another thread, bonding two dissimilar feeds can actually end up reducing the effective bandwidth below just one feed, due to out of order delivery and similar issues. You may want to do some kind of affinity setup with fall back to the other link to mitigate that, but that is a more advanced topic.

You need PCC not bonding.

http://wiki.mikrotik.com/wiki/Manual:PCC