Installation guide

4-104 Cisco 4000 Series Installation Guide
Connecting Routers with a DC-Input Power Supply
scope of this document. For further information, refer to User-Network Interface (UNI)
Forum specifications, International Telecommunication Union Telecommunication
Standardization Sector (ITU-T) standards, and your equipment specifications.
For Further Reference
The following publications contain information on determining attenuation and the power
budget:
• T1E1.2/92-020R2 ANSI, the Draft American National Standard for
Telecommunications entitled “Broadband ISDN Customer Installation Interfaces:
Physical Layer Specification”
• Power Margin Analysis, AT&T Technical Note, TN89-004LWP, May 1989
Connecting Routers with a DC-Input Power Supply
Follow the directions in this section to wire a Cisco 4000 series router with a DC-input
power supply.
Warning Before performing any of the following procedures, ensure that power is
removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on
the panel board that services the DC circuit, switch the circuit breaker to the OFF position,
and tape the switch handle of the circuit breaker in the OFF position. (To see translated
versions of this warning, refer to the appendix “Translated Safety Warnings.”)
Warning When stranded wiring is required, use approved wiring terminations, such as
closed-loop or spade-type with upturned lugs. These terminations should be the appropriate
size for the wires and should clamp both the insulation and conductor. (To see translated
versions of this warning, refer to the appendix “Translated Safety Warnings.”)
Warning This unit is intended for installation in restricted access areas. (To see translated
versions of this warning, refer to the appendix “Translated Safety Warnings.”)