Specifications

8 Port Interface Card

C613-03023-00 REV P

AT-AR021(S) BRI-S/T PIC

The AT-AR021(S) BRI-S/T PIC provides a single Basic Rate ISDN S/T WAN

port. The BRI port has an RJ-45 connector.

The front panel of the AT-AR021(S) PIC is shown in Figure 3 and the functions

of the LEDs are listed in Table 4.

Figure 3: AT-AR021(S) BRI-S/T PIC

In North America, the S/T interface must be supplied from a UL listed

network terminating device such as an NT1, and the cable length between the

AR021(S) PIC and the NT1 device must be less than 1000 metres.

Two user-configurable jumpers provide 100Ω line termination. Jumper

locations on the AT-AR021(S) V3 hardware revision are shown in Figure 4 on

page 9, and jumper functions are listed in Table 5 on page 9. The older V2

hardware revision of the AT-AR021(S) has the same jumpers and functions, but

the positions of the jumpers are reversed. The hardware revision is identified

by the label “AR021 V2” or “AR021v3” printed on the board.

The V3 hardware revision supports TE mode only. The V2 hardware revision

supports both TE and NT mode. Jumper J4, when installed, selects NT mode.

The PIC should be configured as a TE for normal operation.

Table 4: AT-AR021(S) BRI-S/T PIC LED functions

LED Function

B1, B2 For on-demand ISDN, lit when there is a call up over the respective B

channel and flashing when data is being exchanged.

For permanent circuits, lit when HDLC packets are being exchanged

between the switch or router and another TE end system device (normally

another switch or router) over the respective B (data) channel.

Active Lit when the BRI has successfully completed the exchange of INFO 1 and

INFO 2 signals, and INFO 3 and INFO 4 signals are present on the link. This

means that the ISDN interface is correctly connected to a working NT

device.

D Lit when HDLC packets are being exchanged between the switch or

router and the ISDN switch over the D (signalling) channel.

BRI S/T

Active

LEDs

ISDN BRI S/T port (RJ45 connector)

LEDs

AR021SFP