ISDN Demonstrator User’s Manual
40-400-00011, Rev. B
42
U Interface
A two-wire interface required by the FCC (not the ITU-T) between the Local
Exchange Carrier and the customer’s NT1. Specification completed during 1Q87 by
ANSI T1D1.3.
X.25
ITU-T recommendation specifying how user equipment (DTE) is to connect to a
public, packet-switched network (DCE). Specifies Layer 1, 2, and 3 Protocols.
