[ns] Altering link throughput

[Ishan Mandrekar <ishan@io.ece.drexel.edu>]

Dear ns-users:

Is it possible to dynamically alter the throughput of a link during
run-time, which has been intially defined as:
$ns duplex-link $n0   $n3 1Mb        10ms    DropTail

In my script, in certain conditions are met, I would like to reduce the
throughput to 0.5Mb 

Please let me know if it's possible.

Thanks,
Ishan.