I have a Multilink configuration which, after about 1 week, both member T1's start showing numerous errors. A simple reboot of the router resolves the problems.
On both central and remote routers, the T1's are configured to look at the provider line for the clock.
At the central site I am using a VWIC2-2MFT-T1/E1 which has both T1 ports on the card in a 2811 router.
At the remote site, I am using 2 separate WIC1DSU-T1V2 cards that each have a single T1 port in an 1841 router.
The question(s): Should I obtain clocking from the line? or internal? Should my remote site use the VWIC2-2MFT-T1/E1 card rather then two WIC1DSU-T1V2 cards?