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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.