This object is instantiated only for a VPL
which is cross-connected to other VPLs
that belong to the same VPC. All such
associated VPLs have the same value of this
object, and all their cross-connections are
identified either by entries that are indexed
by the same value of atmVpCrossConnectIndex in
the atmVpCrossConnectTable of this MIB module or by
the same value of the cross-connect index in
the cross-connect table for SVCs and Soft PVCs
(defined in a separate MIB module).
At no time should entries in these respective
cross-connect tables exist simultaneously
with the same cross-connect index value.
The value of this object is initialized by the
agent after the associated entries in the
atmVpCrossConnectTable have been created.