ATM virtual interface's maximum cell rate.
If bandwidth is available, the interface will
be allocated bandwidth upto this value.
The total bandwidth of connections configured over this
interface cannot exceed this value.
The value of this object can't exceed the 'ifSpeed' or
'ifHighSpeed' value in ifTable for the associated
'caviPhyIfIndex'.
ATM cell bandwidths for various physical lines are:
OC192 line : 22605280 cells/sec
OC48 line : 5651320 cells/sec
OC12 line : 1412830 cells/sec
OC3 line : 353207 cells/sec
T3 line : 96000 cells/sec
E3 line : 80000 cells/sec.