The NT1 is used as a network termination for basic access to ISDN networks and features 2-channel transmission at 64 Kbit/sec and single channel transmission at 16 Kbit/sec (2B+D) on a single line pair.
The NT1 makes it possible to connect up to 8 ISDN terminations (TE) on the S/T interface, while the terminations themselves can be powered by a 220V internal power unit connected to the mains.

The device is ETSI 300012 and CCITT I 430 compliant as concerns the technical specifications of the S/T interface (level 1), as well as TS 102 080 and CCITT G961 compliant as concerns the electrical specifications of the U interface.

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