This specification defines the interfaces and Terminal Adaptation Functions (TAF) integral to a Mobile Termination (MT) which enables the attachment of asynchronous terminals to a MT (see GSM 04.02). The general aspects of Terminal Adaptation Functions are contained in GSM 07.01. This specification covers support of these services for the following interfaces and procedures: (i) V.14 procedures (ii) V.21 DTE/DCE interface (iii) V.22bis DTE/DCE interface (iv) V.23 DTE/DCE interface (v) V.32 DTE/DCE procedures (vi) I.420 S interface (vii) V.25bis signalling procedures The asynchronous data rates between the MT and the TE2 are defined in GSM 02.02.