This Technical Basis for Regulation (TBR) specifies the attachment requirements and corresponding test principles for a terminal equipment interface intended for connection to the network termination points of Open Network Provision (ONP) ordinary quality or special quality voice bandwidth 4-wire analogue leased lines defined by ETS 300 451 and ETS 300 452. The term "attachment requirements" in the context of this TBR describes the essential requirements for access which have to be fulfilled under articles 4(c) to 4(f) of the Second Phase Directive (91/263/EEC).
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