Preventing Power Loss; Power Connection Guidelines - Cisco NCS 4201 Hardware Installation Manual

Installing the Cisco NCS 4201
• DC power—-48 V/60 Vdc or 24 Vdc
The DC power supply uses 2 position terminal block-style connector. The terminal block connector is of
suitable size to carry the appropriate AWG wire size to handle the input current of the power supply. ON/OFF
switch is provided.
• AC power—100 VAC to 240 VAC
The AC power supply has an IEC 320-type power receptacle and a 15-A service connector. You can use
standard straight power cords with the AC power supply. The power supply includes a power cord retainer
clip that can only accept straight power cords. No ON/OFF switch is provided.
Each power supply provides a single primary input power connection. You can install dual-power supplies
for redundancy.
Warning Read the installation instructions before connecting the system to the power source. Statement 1004
Note
Products that have an AC power connection are required to have an external surge protective device (SPD)
provided as part of the building installation to comply with the Telcordia GR-1089 NEBS standard for
electromagnetic compatibility and safety.
Caution
Do not use interface module or power supply ejector handles to lift the chassis; using these handles to lift the
chassis can deform or damage the handles.
The following sections provide more information on the Cisco NCS 4201 power supplies:

Preventing Power Loss

Use the following guidelines to prevent power loss to the chassis:
• To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types

Power Connection Guidelines

This section provides guidelines for connecting the Cisco NCS 4201 power supplies to the site power source.
Warning This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure that
the switch functional ground lug is connected to earth ground during normal use. Statement 1064
supplies is within the current ratings of the wiring and breakers.
that use ferroresonant technology. These UPS types can become unstable with systems such as the Cisco
NCS 4201, which can have substantial current-draw fluctuations due to bursty data traffic patterns.
Cisco NCS 4201 Hardware Installation Guide
Preventing Power Loss
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