C-20 Preliminary November 4, 1998 MAX 4000 Series Hardware Installation Guide
Cables and Connectors
ISDN BRI interface specifications
E1/PRI WAN ports
Table C-18 lists the pins on RJ-48C sockets on the MAX used for E1/PRI WAN interface.
Only pins 1, 2, 4, and 5 are used. The remaining pins are not connected.
Note: E1/PRI models are also equipped with BNC connectors.
ISDN BRI interface specifications
The MAX unit’s ISDN BRI interface has specifications for the Net/BRI module and the
Host/BRI module.
Warning: To reduce the risk of fire, communication cable conductors must be 26 AWG or
larger.
Avertissement: Afin de reduire les risques d'incendie, les fils conducteurs du cable de com-
munication doivent etre d'un calibre minimum de 26 AWG (American Wire Gauge),
c’est-a-dire d'un minimum de 0,404 mm.
Warnung: Um Feuerrisiken zu reduzieren, müssen die Kommunikationskabel-Anschlüße 26
AWG oder größer sein.
For the Net/BRI module
The Net/BRI module (MX-SL-8BRIN) connects to the WAN through a network termination
(NT1) device. You must install a cable from the NT1 that ends in a 100Ω termination. The
maximum distance between the NT1 and its termination is 3280 feet (1000 m). You can install
the Net/BRI module anywhere along the length of the cable. Use only cable specifically
constructed for ISDN BRI interfaces.
Note: In Belgium, install 10 m of cable between the Net/BRI module and the NT1.
Significant data errors can result from use of shorter cables.
Table C-18. Transmit and Receive pins
MAX E1/PRI interface RJ-48C DTE
Receive (input) pair, Tip (T1)
Receive (input) pair, Ring (R1)
Position 2
Position 1
Transmit (output) pair, Tip (T)
Transmit (output) pair, Ring (R)
Position 5
Position 4
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