Identifies the logical connection address between the provider’s switch and the related circuit for the virtual circuit requested.
USAGE: This field is conditional.
NOTE 1: Prohibited when the BSC field on the EUSA or Transport Form is “F” and the VST field is not populated.
NOTE 2: Prohibited when the VST field is “B”.
NOTE 3: Otherwise optional.
DATA CHARACTERISTICS: 5 numeric characters
EXAMPLES: 6 3 0 1 1
6 3
NOTE 1: This example illustrates a numeric value but is left justified since it is treated as text.