This object is implemented only for a VCL
which is cross-connected to other VCLs
that belong to the same VCC. All such
associated VCLs have the same value of this
object, and all their cross-connections are
identified by entries in the
atmxVcCrossConnectTable for which
atmxVcCrossConnectIndex has the same value.
The value of this object is initialized by the
agent after the associated entries in the
atmxVcCrossConnectTable have been created.