Ol-1984-06; Preparing For Installation - Cisco uBR-3x10 Hardware Installation And Cabling Manual

Chapter 2

Preparing for Installation

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:
To locate the most reliable channels for your downstream and upstream channel plans, we recommend
Note
that you perform a sweep of all available channels for at least a 24 hours to verify the presence or absence
of impulse and ingress noise.
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AC Power
The AC input of the power supply module uses a power factor corrector that allows the Cisco uBR 3x10
RF Switch to operate on input voltage and frequency within the ranges of 100 to 240 VAC and
50 to 60 Hz.
We recommend an uninterruptable power source to protect against power failures at your site. An
Note
AC-input power supply has an electrical current rating of less than 1 A.
See
including input voltage and operating frequency ranges.
DC Power
The DC input of the power supply module operates at -48 VDC input voltage and supplies +12.0 VDC
power to the Cisco uBR 3x10 RF Switch's internal components through the midplane.
Each DC-input power supply has an electrical current rating of 0.7A, 20 VA. Use a minimum of 14 AWG
Note
(2.5 mm
15 A circuit breaker or fuse that is in compliance with your local electric regulations.
See
including input voltage and operating frequency ranges.

OL-1984-06

Select forward and reverse channel frequencies from the range specified in your channel plan.
Verify that your cable network meets system requirements and Data-over-Cable Service Interface
Specifications (DOCSIS) and/or EuroDOCSIS downstream and upstream specifications.
Make sure that the site maintains an ambient temperature of 32 to 104°F (0 to 40°C), and keep the
area around the chassis as free from dust as is practical.
Appendix A, "Specifications and Component Part Numbers,"
2
) wire for the input to each DC-input power supply. The power input must be protected by a
Appendix A, "Specifications and Component Part Numbers,"
Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide
Site Requirements
for system power specifications,
for system power specifications,
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