12
Planning the 7781CM Installation
Powering Options
Powering Options
The 7781CM supports both DC power or AC power over cable (POC). Normally 12 VDC
power is only used at the depot or when debugging. 45 to 90 VAC POC is only used when
the 7781CM is mounted on a cable strand and powered via an F-type coaxial cable
connected to the HFC cable plant.
The customer-ordered 1.5A 12 VDC power supply part number is 902-0169-xxyy, where
xx = Country and yy = revision.
NOTE:
The 7781CM does not provide PoE output when powered by 12 VDC.
CM Heater
The 7781CM includes a built-in heater for the cable modem that permits operation at
extremely low temperatures. The heater is typically on below 0° C (32° F).
The heater is powered by POC only. When the 7781CM is powered by 12 VDC, the heater
is disabled.
Positioning the GPS Antenna
The 7781CM AP includes an internal GPS antenna. If the AP is to be used with the optional
GPS feature enabled, then the GPS antenna must be mounted outdoors and have as clear
a view of the sky as possible (as close as possible to 360 degrees, and with no obstructing
trees or buildings). The GPS antenna must not be installed where it can be covered with
snow buildup to avoid attenuating the GPS signal. These requirements must be met to
ensure that the GPS module can obtain lock and provide accurate GPS time and position.
If the GPS antenna has less than a clear 360-degree view of the sky, then the GPS module
may experience degraded performance.
shows the GPS antenna location in the 7781CM, and
7781CM dome-down mounting to maximize GPS antenna effectiveness.
Содержание ZoneFlex series
Страница 2: ......
Страница 6: ...iv ...
Страница 62: ...56 What to Do Next Reading Related Documentation ...
Страница 67: ...61 Appendix B Rebooting and Resetting the 7781CM ...
Страница 68: ...Copyright 2006 2013 Ruckus Wireless Inc 350 West Java Dr Sunnyvale CA 94089 USA www ruckuswireless com ...