At-Ar021(U) Bri-U Pic - Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual

Hardware Reference
C613-03023-00 REV J
The termination jumpers (J1 and J2) are normally removed as the building
wiring will provide the correct termination for an ISDN TE-to-NT circuit.
When the BRI is connected in a point-to-point configuration, J1 and J2 may
need to be installed to terminate the line pairs with internal 100Ω resistors. For
detailed information, see the Integrated Services Digital Network (ISDN) chapter
of the Software Reference or Reference Manual for your switch or router.
If you are unsure of whether to terminate the line or not, contact your ISDN
service provider, or your authorised Allied Telesyn distributor or reseller.

AT-AR021(U) BRI-U PIC

The AT-AR021(U) BRI-U PIC provides a single Basic Rate ISDN U Interface
WAN port. The BRI port has an RJ-45 connector.
There are no user-configurable jumpers or dip switches on the AT-AR021(U)
BRI-U PIC board.
The AT-AR021(U) PIC is shown in
listed in Table 5.
Figure 5: AT-AR021(U) BRI-U PIC
Table 5: AT-AR021(U) BRI-U PIC LED functions
LED Function
B1, B2 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
For ISDN, lit when there is a call up over the respective B channel and
flashing when data is being exchanged.
Active Lit when the U interface is in the Activated state (i.e., it is fully operational
at layer 1).
D Lit when HDLC packets are being exchanged between the switch or
router and the ISDN switch over the D (signalling) channel.
Before removing this PIC, ensure that the power to the switch or router has been
disconnected and that the ISDN connection has been removed from the BRI U
interface connector. Dangerous voltages may be present on an ISDN line
interface.
Figure 5, and the functions of the LEDs are
ISDN BRI U interface (RJ45 connector)
B1
B2
9
Active
D
LEDs
PIBRI1UR