An optional user facility in the virtual call service of CCITT X.25 protocol that allows the inclusion of user data in the call request/connected and clear indication packets. Note: Fast select is an essential feature of the CCITT X.25 (1984) protocol.
FAST SELECT
Meaning of FAST SELECT in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012