Cisco 1603R Quick Start Manual page 9

C. Connect the router to the wide-area network (continued).
Cisco 1604 ISDN BRI U Connection
Note: You must provide a straight-through cable, either RJ-11-to-RJ-11 (standard telephone cable) or
RJ-45-to-RJ-45, for this connection.
Step 1
Connect one end of the cable to the red ISDN BRI Ø port on the rear panel.
Step 2
Connect the other end directly to the ISDN wall jack.
For instructions on connecting another ISDN device such as a fax or telephone to the ISDN PHONE port, refer
to the hardware installation guide that came with your router.
NT1 LED
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