Preventing Power Loss; Power Connection Guidelines - Cisco ASR 903 Hardware Installation Manual

Preventing Power Loss

The AC power supply has an IEC 320-type power receptacle and a 15 Amp service connector. You can use
standard right angle power cords with the AC power supply. The power supply includes a power cord retainer.
No ON/OFF switch is provided.
Each power supply provides a single primary input power connection. You can install dual power supplies
for redundancy.
Read the installation instructions before connecting the system to the power source. Statement 10
Warning
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.
Do not use power supplies of different capacities together in the router for prolonged durations.
Caution
Caution Do not use interface module and power supply ejector handles to lift the chassis; using the handles to lift
the chassis can deform or damage the handles.
Preventing Power Loss
Use the following guidelines to prevent power loss to the router.
• 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
Use the information in the
heat dissipation of a Cisco ASR 903 Router based on a given configuration of the router. Determining power
requirements is useful for planning the power distribution system needed to support the router.

Power Connection Guidelines

This section provides guidelines for connecting the Cisco ASR 903 Router power supplies to the site power
source.
Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground
Warning
conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain
that suitable grounding is available. Statement 213
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
102
supplies is within the current ratings of the wiring and breakers.
that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco
ASR 903 Router, which can have substantial current draw fluctuations due to bursty data traffic patterns.
DC Power Specifications, on page 3
Installing the Cisco ASR 903 Router
to estimate the power requirements and