This attribute specifies the number of VCCs supported for the VPI
Zero VCC Space. The VCI values of these VCCs range from 0 to
(numVccsForVpiZero - 1).
The size of the VPI Zero VCC Space must either be 0 or a multiple
of 256. A value of 0 implies that no programmable VCCs can be
used. In this case numNonZeroVpisForVccs must also
be 0.
The values of all attributes provisioned in this group must adhere to
the guidelines laid down in the description of the Provisioned
group.