Specifications

Hardware Reference 83
C613-03058-00 REV A
ISDN Interface Cables
AR routers support two types of ISDN interface—Primary Rate Access and
Basic Rate Access. Figure 42 on page 83 shows how to wire a cable to connect a
Basic Rate Interface (BRI) to the ISDN network terminating equipment (NT).
Figure42: Pin wiring diagram for an ISDN Basic Rate Interface cable.
For Primary Rate Access there are two cabling options. Figure 43 on page 83
shows how to wire a cable to connect to the 120Ω connector of a Primary Rate
Interface (PRI). Currently there is no accepted standard for the connector at the
network termination end, so only the cable’s router end is shown. Consult you
ISDN service provider for more information.
Figure 44 on page 84 shows how to wire a cable to connect to the 75Ω connector
of a Primary Rate Interface (PRI).
Figure43: Pin wiring diagram for an ISDN Primary Rate Interface (120Ω) cable.
RJ45
(to switch or router)
RJ45
(to NT)
1
2
3
6
4
5
7
8
→
→
←
←
Not connected
Not connected
RX+
RX-
TX-
TX+
Not connected
Not connected
Notes:
(1) → Output from switch or router; ← Input to switch or router.
(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.
1
2
3
6
4
5
7
8
Not connected
Not connected
TX+
TX-
RX-
RX+
Not connected
Not connected
→
→
←
←
BRI1NT
RJ45
(to switch or
router)
←
←
→
Notes:
(1) → Output from switch or router; ← Input to switch or router.
(2) Use Grade 5 twisted pair cable, with pairs 1 and 2, and 4 and 5.
(3) Cable version 1.0.
1
2
3
4
5
6
7
8
RX+
RX-
Not connected
→ TX+
TX-
Not connected
Not connected
Not connected
PRI120NT