Tips and Training >> Definitions >> NT3

What is NT3?

An NT3 is a network interface that converts up to 3 Basic Rate ISDN network interfaces from a telephone provider to a form that is suitable for ISDN equipment such an ISDN capable video conferencing system. The term "NT3" is often used to describe the quantity of BRI lines that the device converts from a telco U interface to an S/T interface which is required by user equipment.

An NT3 is really three NT1's in a single box. The terms NT3 and NT4 indicate the number of connections that are available on a device to connect to the telco provider jacks.

Why do I need 3 BRI connections?

A commonly accepted business standard for ISDN video conferencing applications is to use a bandwidth of not less than 384Kbps. Generally, a single basic rate ISDN line from a telephone company can provide up to 128Kbps of bandwidth to a videoconferencing system. Three of these network lines provide the business grade 384Kbps bandwidth that users generally require as a minimum.

Prior to the development of NT3's, three separate NT1's were used in video conference applications. Conservation of both expense and space led to the development of the NT3.

If your application requires an NT3, contact TKO VideoConferencing and we can provide one from our stock.

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