Essential requirements for terminal equipment intended for connection to unstructured digital leased circuits of the public telecommunications network using a CCITT Recommendation G.703 interface at a rate of 8448 kbit/s with a 75 ohms unbalanced presentation
Edition 1994-11-15

Essential requirements for terminal equipment intended for connection to unstructured digital leased circuits of the public telecommunications network using a CCITT Recommendation G.703 interface at a rate of 34368 kbit/s with a 75 Ώ unbalanced presentation
Edition 1994-11-15

Essential requirements for terminal equipment intended for connection to digital leased circuits of the public telecommunications network using a CCITT Recommendation X.21bis interface
Edition 1995-01-15

INTEGRATED SERVICES DIGITAL NETWORK (ISDN); USER-NETWORK INTERFACE DATA LINK LAYER SPECIFICATION. APPLICATION OF CCITT RECOMMENDATIONS Q.920/I.440 AND Q.921/I.441.
Edition 2000-01-31

TERMINAL EQUIPMENT (TE). ATTACHMENT REQUIREMENTS FOR TERMINAL EQUIPMENT TO BE CONNECTED TO CIRCUIT SWITCHED DATA NETWORKS AND LEASED CIRCUITS USING A CCITT RECOMMENDATION X.21 INTERFACE, OR AT AN INTERFACE PHYSICALLY, FUNCTIONALLY AND ELECTRICALLY COMPATIBLE WITH CCITT RECOMMENDATION X.21 BUT OPERATING AT ANY DATA SIGNALLING RATE UP TO, AND INCLUDING, 1984 KBIT/S.
Edition 1999-01-11

DIGITAL TERMINALS AND ACCESS (DTA). ATTACHMENT REQUIREMENTS FOR DATA TERMINAL EQUIPMENT (DTE) TO CONNECT TO PACKET SWITCHED PUBLIC DATA NETWORKS (PSPDNS) FOR CCITT RECOMMENDATION X.25 INTERFACES AT DATA SIGNALLING RATES UP TO 1920 KBIT/S UTILIZING INTERFACES DERIVED FROM CCITT RECOMMENDATIONS X.21 AND X.21 BIS.
Edition 1999-01-25

Information processing - Conversion between the two coded character sets of ISO 646 and ISO 6937-2 and the CCITT international telegraph alphabet No. 2 (ITA 2) (ISO 6936:1988)
Edition 2000-05