| Steve & Susan 2005-05-22, 8:52 am |
| On Fri, 20 May 2005 11:58:42 GMT, DonS@InSee.rr.com (Don S) wrote:
>Typically, the nominal -48Vdc power for the MTSO/CO is provided by a power
>system that converts AC to DC. The batteries are only used in the event of a
>power outage. They are connected via busbar so there is no transfer time.
>Most critical sites also have one or more backup gen-sets to provide power
>beyond the battery capacity.
>
>You also need this in the remote/DLC cabinets and cell sites that may be
>serving the end user. If the cell site or DLC dies, the end sub has no
>service, regardless of the condition of the upstream MTSO or CO.
The problem with wireless sites are connectivity and keeping systems
within tolerance. If something along the route from the MTSO is
disrupted, the site is isolated. As far as battery power, if HVAC is
not continued, the equipment will fail out even if the batteries have
remaining capacity.
Some of the sites out here have generator connections and manual
transfer switches. The batteries float volatile settings, but when the
power is out, so is the system.
As an emergency manager, my perennial question to wireless providers -
especially to those who purport to be "interoperability solutions" is:
Since the sites have a jack and a manual transfer switch, when a
technological emergency happens and there is no power, who gets the
resources??? What guarantee is there that they will support my
operation and not run with their resources to the "big" city 45 miles
away?
From my side of the fence, every site is a critical site, particularly
when a company is marketing itself to be of service to public safety
providers.
Steve
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