Cisco 7940 Series

Appendix A Safety Information
Safety Notices
A-2
Cisco IP Phone 7960 and 7940 Series User Guide
78-10182-07
Warning To avoid electric shock, do not connect safety extra low voltage (SELV)
circuits to telephone network voltage (TNV) circuits. LAN ports contain
SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN
ports use RJ-45 connectors. Use caution when connecting cables.
Warning The following warnings apply when you use the external power supply with
the Cisco IP Phone:
Warning This product relies on the building's installation for short-circuit (over
current) protection. Ensure that a fuse or circuit breaker no larger than 120
VAC, 15A U.S. (240 VAC, 10A international) is used on the phase conductors
(all current-carrying conductors).
Warning The device is designed to work with TN power systems.