Specifications

6 Port Interface Card
C613-03023-00 REV P
AT-AR020 PRI E1/T1 PIC
The AT-AR020 PRI E1/T1 PIC provides a single G.703/Primary Rate ISDN
WAN port with an RJ-45 connector.
The front panel of the AT-AR020 PRI E1/T1 PIC is shown in Figure 1, and the
functions of the LEDs are listed in Table 2.
Figure 1: AT-AR020 PRI E1/T1 PIC
The AT-AR020 supports both E1 and T1 operation. A jumper selects the
required mode. A second jumper selects NT (Network Terminator) or TE
(Terminal Equipment) mode, and the current mode is displayed by the NT LED.
This jumper is factory set to TE mode for normal operation and should not be
changed without contacting your ISDN service provider, or authorised Allied
Telesis distributor or reseller. Earlier versions of this card also have a J3 jumper.
If present, this jumper must be installed for E1 mode and removed for T1
mode.
Jumper locations are shown in Figure 2 on page 7, and jumper functions are
listed in Table 3 on page 7.
Table 2: AT-AR020 PRI E1/T1 PIC LED functions
LED Function
D Data [ISDN mode only] Lit when HDLC packets are being exchanged between
the switch or router and the ISDN switch over the D (signalling) channel.
B Data Lit when HDLC packets are being exchanged between the switch or
router and another end system device (normally another switch or router)
over any of the B (data) channels.
Active Lit whenever operational (i.e., no RAI or AIS) frames are being received.
NT [ISDN mode only] Lit when the PRI1 is operating in NT mode. This LED
should not be lit during normal operation.
Active
LEDs
PRI E1/T1 (RJ45 connector)
D Data
B Data
LEDs
AR020FP
PRI E1/T1
NT