European Union:
TBR 3 - Attachment requirements for terminal equipment to connect to an ISDN using ISDN basic access.
TBR 37 / 21 - Attachment requirements for pan-European approval for connection to the analogue PSTNs of TE supporting the justified case service when connected to the analogue interface of the PSTN in Europe
FCC – USA: FCC Part 68 - Part 68 of the FCC rules (47 C.F.R. Part 68) governs the direct connection of Terminal Equipment (TE) to the Public Switched Telephone Network (PSTN), and to wireline carrier-owned facilities used to provide private line services. Part 68 also contains rules concerning Hearing Aid Compatability and Volume Control (HAC/VC) for telephones, dialing frequency for automated dialing machines, source identification for fax transmissions, and technical
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