Cisco 700 series, Installation Manual

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Connecting the ISDN Line
Cisco 700 Series Router Installation Guide 3-4
Provisioning the NT1
Outside of North America, you might need to provide an external network terminator type 1
(NT1) and the ISDN U cable that connects the NT1 to the ISDN wall jack. Contact your
telephone service provider and ask for the following information:
•
Is an external NT1 and an ISDN U cable required?
•
Does the telephone service provider provide the NT1 or must you supply it?
•
If you must supply the NT1, can the telephone service provider provide a list of NT1
vendors?
Inside North America, if you have a 761, 765, 771, or 775, you must provide an external
NT1 and the ISDN U cable that connects the NT1 to the ISDN wall jack. Contact your
telephone service provider for a list of NT1 vendors. If you have a 762, 766, 772, or 776,
you can use the internal NT1 in the router.
Note
Detailed information on provisioning your line can be found in Appendix C,
“Provisioning the ISDN BRI Line.” In addition, the Cisco 700 Quick Reference Guide
contains a form to guide you in gathering the provisioning information.
Warning Network hazardous voltages are present in the ISDN cable. If you
detach the ISDN cable, detach the end away from the router first to avoid possible
electric shock. Network hazardous voltages also are present on the system card in
the area of the ISDN port (RJ-45 connector), regardless of when power is turned
to standby.
Warning
Do not work on the system or connect or disconnect cables during
periods of lightening activity.
Warning
To reduce the risk of fire, use only No. 26 AWG or larger
telecommunications line cord.