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TOPIC: ISDN Concepts

ISDN Concepts 13 years 5 months ago #12750


Could someone please explain the difference between an NT2 device and Local Termination Equipment.

I'll explain why I ask:

R Reference Point is the point between TE2 device and TA.

S Reference Point is the point between Router and NT2.

T Reference Point is the point between NT1 and NT2.

U Reference Point is point between NT1 and Local Termination Equipment in a carrier network.

Thanks in advance


Re: ISDN Concepts 13 years 5 months ago #12780

NT2 (Network termination type 2) is the device used to direct traffic from ISDN devices (TEs) to an NT1. It provides switching and concentrating and can sometimes even be a private branch exchange (PBX).

NT1 (Network termination type 1) is the device used to convert a 4-wire ISDN connection to the 2-wire ISDN used by the local loop facility.

Local termination (LT) This is the same device as an NT1, but located at the provider’s site.

References points:

TE1----S----NT2----T----NT1----U----ISDN Switch
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