This attribute specifies the initial VPI of the optional Programmable
VCC Space.
If numNonZeroVpisForVccs is 0 then the Programmable VCC
Space does not exist and the value of this attribute is ignored. If
numNonZeroVpisForVccs is greater than 0 the Programmable VCC
Space exists and covers the VPI values ranging from
firstNonZeroVpiForVccs to (firstNonZeroVpiForVccs +
numNonZeroVpisForVccs - 1).
For Apc-based cards, this value can be any integer number between
1 and 255 for UNI applications and between 1 and 4095 for NNI
applications. For CQC-based cards the initial VPI of the
Programmable VCC Space must be no greater than 240, and either
1 or a non-zero multiple of 16. The values of all attributes
provisioned in this group must adhere to the guidelines laid down in
the description of the Provisioned group.