Fig. 12.8. Functional groupings.

Terminal Equipment 1 (TE1). TE1 are ISDN terminals like video conferencing equipment, Group-4, fax, feature telephone which are digital and can be directly connected to NT through 'S' bus interface.

Terminal Equipment 2 (TE 2). TE2 are non ISDN terminals such as analog phone, PC, G3, FAX which are non digital and can not be directly connected to NT1. They require another interface called Terminal adaptor (TA).

Terminal adapter (TA). TA enables analog to digital conversion and vice versa. Otherwise the purpose of TA is to convert the bipolar signalling from the public network to the unipolar signalling used by computers. The most prevalent use of TA is to connect a computer to an ISDN line.

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