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3.2.4 ISDN NT and TE
NT means Network Terminal. The ISDN port in NT mode is a port that used to connect
general ISDN phones. And TE means Terminal Equipment. The ISDN port in TE mode is a
port that used to connect ISDN line or ISDN PBX.
As for the Private Branch Exchange (PBX), it is more special because it has both
ISDN-NT and ISDN-TE devices at the same time. Outside lines of the PBX are usually
connected to the ISDN line, at this case, the PBX acts as ISDN-TE equipment; inside lines of
the PBX are usually connected to telephones, so the PBX acts as ISDN-NT equipment.
Based on the characteristics described above that the ISDN-NT equipment and the ISDN-TE
equipment must connect with each other, please pay special attention when you use
ISDN-NT card and ISDN-TE card.
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