An entry in cds0CrossConnectConfigTable table represents a DS0
cross connection. The two end point of the connection are:
end point 1: cds0Endpt1Ds1 cds0Endpt1Ds0Group
end point 2: cds0Endpt2Ds1 cds0Endpt2Ds0Group
The end points of this connection should be entries
of ccasGrpCfgTable and 'ccasGrpCfgServiceType' of
of the entries should be 'tdmxconn'. The ccasGrpCfgTable is
defined in CISCO-CAS-IF-MIB.