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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
Chapter 2 Preparing the Cisco uBR7225VXR Router for Installation
Site Requirements
• Ensure that the network processing engine is fully inserted in its chassis slot and the captive
installation screws are tightened. The captive installation screws prevent accidental removal,
provide proper grounding for the system, and help ensure that the bus connectors are seated in the
midplane.
• Ensure that each cable interface line card is fully inserted in its chassis slot and that its captive
installation screws are tightened.
Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be
between 1 and 10 megohms.
Site Requirements
To ensure normal operation and avoid unnecessary maintenance, plan your site configuration and
prepare your site before installation. Take into account the following criteria:
• Verify that your cable network meets system requirements and DOCSIS or EuroDOCSIS
downstream and upstream specifications.
• Select forward and reverse channel frequencies from the range specified in your channel plan.
• Make sure that the site maintains an ambient temperature of 32 to 104
o
F (0 to 40
o
C), and keep the
area around the chassis as free from dust as is practical.
Note To locate the most reliable channels for your downstream and upstream channel plans, we recommend
that you perform a sweep of all available channels for at least a 24-hour period to verify the presence or
absence of impulse or ingress noise.
AC Power
The AC-input power supply uses a power factor corrector that allows the Cisco uBR7225VXR router to
operate on input voltage and frequency within the ranges of 100 to 240 VAC and 50/60 Hz.
Note We recommend an uninterruptable power source to protect against power failures at your site. For the
Cisco uBR7225VXR router, the 300W AC-input power supply has an electrical input current rating of
4A with 100Vac input and the 540W AC-input power supply has an electrical input current rating of 6.5A
with 100Vac input.
See Appendix A, “Cisco uBR7225VXR Router Specifications,” for system power specifications,
including input voltage and operating frequency ranges.
Site Environment
Table 2-1 lists the operating and nonoperating environmental site requirements. The following ranges
are those within which the Cisco uBR7225VXR router continues to operate; however, a measurement
that is approaching the minimum or maximum of a range indicates a potential problem. You can maintain
normal operation by anticipating and correcting environmental anomalies before they approach the
minimum or maximum of an operating range.