The connections for this service. Interpret this as a 16 bit
field per connection: Trunking 1, PTOP Bridging 1,
Classical IP 1..255.
For Vlan cluster, this object is interpreted as a 32 bit field
where each 32 bit represent the vci value of the Data Direct vcc
and the Multicast In vcc. Each vcc take up 16 bits. There can
be up to 32 pairs of Data Direct vcc and Mulitcast In vcc.
For 1483 Scaling Service, create it only with 1 group
and 1 vc thru this atmxServiceGroup. Adding Other group-to-vc
mapping should utilize the atmx1483ScaleGroup.