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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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.