VPI - Virtual Path Identifier

Identifies the logical connection address between the provider’s switch and the circuit for the virtual path requested.

USAGE: This field is conditional.

NOTE 1: Required when the BSC field on the EUSA or Transport Form is “C” and the VCACT field is “D” or “R” and the CTYP field is “P”.

NOTE 2: Required when the VST field is “B” and the VCACT field is “D” or “R” and the CTYP field is “P”.

NOTE 3: Prohibited when the BSC field on the EUSA or Transport Form is “F”.

NOTE 4: Prohibited when the VST field is “A” or “C”.

NOTE 5: Prohibited when the VCACT field is “C”.

NOTE 6: Required when the VCI field is populated.

NOTE 7: Otherwise optional.

DATA CHARACTERISTICS: 4 numeric characters

EXAMPLE: 6 2 3

NOTE 1: This example illustrates a numeric value but is left justified since it is treated as text.