This standard specifies the user-network interface data link layer of the pan European Integrated Services Digital Network (ISDN) as provided by European public telecommunication operators at the T reference point or coincident S and T reference point (as defined in CCITT Recommendation I.411 [13] by means of Digital Subscriber Signalling System No. 1 (DSS1).
PUBLISHED
SSH ETS 300 125:1991
60.60
Standard published
Jun 18, 2024