Integrated Services Digital Network (ISDN); Attachment Requirements for Terminal Equipment to Connect to an ISDN Using ISDN Basic Access Layer 3 Aspects
In accordance with CCITT Recommendation I.420 [5] and ETS 300 102-1 [2] and ETS 300 102-2 [3]@ this standard specifies the layer 3 access control protocol to be offered by terminal equipment as defined in ??.1.2 at the T reference point or coincident S and T reference point at an interface to a public telecommunications network presented at an ISDN basic access point. The static attachment requirements and tests specified in this ETS are for TEs having the capability of both originating a circuit switched call and receiving an incoming circuit switched call. In addition@ certain TEs of a specialised nature may employ supplementary services as part of their default operation characteristics. The requirements and tests for these specialised terminals are also not covered in this standard. NOTE -No requirements or tests are included in this document concerning the procedures for packet communications@ user-to-user signalling or supplementary services except for the case of the terminal portability supplementary service which can be considered as an essential feature of many ISDN terminals. However@ TEs implementing packet facilities@ user-to-user signalling or supplementary services may be subject to additional and/or alternative testing by those Administrations whose ISDNs provide the support of packet calls@ user-to-user signalling and/or supplementary services.