Isdn Interface Cables - Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual

Hardware Reference
C613-03023-00 REV J

ISDN Interface Cables

PICs provide two ISDN interface options. The AT-AR021(S) BRI-S/T and AT-
AR021(U) BRI-U PICs provide Basic Rate ISDN interfaces, while the AT-AR020
PRI E1/T1 provides a Primary Rate ISDN interface.
Figure 22 shows how to wire a cable to connect a Basic Rate Interface (BRI) to
the ISDN network terminating equipment (NT).
Figure 22: Pin wiring diagram for an ISDN Basic Rate straight-through Interface cable
RJ45
(to switch or router)
Not connected 1
Not connected
2
→
TX+
3
→
TX-
6
←
RX-
4
←
RX+
5
Not connected 7
Not connected
8
Notes:
→ Output from switch or router; ← Input to switch or router.
(1)
(2) Use twisted pair cable, with pairs 3 and 6, and 4 and 5.
(3) Each wire is connected to the same pins at each end.
(4) Cable version 1.0.
Figure 23 shows how to wire a cable to connect to the RJ-45 connector of a
Primary Rate Interface (PRI). Currently there is no accepted standard for the
connector at the network termination end, so only the switch end of the cable is
shown. Consult you ISDN service provider for more information.
Figure 23: Pin wiring diagram for an ISDN Primary Rate Interface (120Ω) cable
RJ45
(to switch or
router)
←
RX+ 1
←
RX- 2
Not connected 3
→
TX+ 4
→
TX- 5
Not connected 6
Not connected 7
Not connected 8
Notes:
→ Output from switch or router; ← Input to switch or router.
(1)
(2) Use Grade 5 twisted pair cable, with pairs 1 and 2, and 4 and 5.
(3) Cable version 1.0.
37
RJ45
(to NT)
Not connected
1
Not connected
2
→
RX+
3
→
RX-
6
←
TX-
4
←
TX+
5
Not connected
7
Not connected
8
BRI1NT
PRI120NT