This attribute indicates the number of enabled VCCs, VPCs, and
VPTs in this AtmIf. An example of a VCC not in the enabled state is
a Vcc with a Test subcomponent where the test is not started.
Each Vcc or Vpc is counted as 1 connection. Each basic Vpt is
counted as 2 connections and each standard Vpt is counted as 3
connections.
Each connection appropriately reduces the number of connections
indicated in Arc totalConnectionPoolAvailable and increases the
number of connections indicated in Arc totalConnectionPoolUsage.