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ISDN BRI S/T Port Pinouts

The table below shows the ISDN BRI S/T port pinouts (RJ-45).

8 Pin1

TE2

NT3

Polarity

3

Transmit

Receive

+

4

Receive

Transmit

+

5

Receive

Transmit

-

6

Transmit

Receive

-

1Pins 1, 2, 7, and 8 are not used.

2TE refers to terminal terminating Layer 1 aspects of TE1, TA, and NT functional groups. This applies to the Cisco 1603 and the ISDN BRI S/T WAN interface card.

3NT refers to network terminating Layer 1 aspects of NT1 and NT2 functional groups. This applies to the Cisco 1604 ISDN S/T port.

ISDN BRI U Port Pinouts (RJ-45)

The table below lists the ISDN BRI U port pinouts and their function.

8 Pin1

Function

3

No connection

4

Signal -- Tip or Ring

5

Signal -- Tip or Ring

6

No connection

1Pins 1, 2, 7, and 8 are not used.

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