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From: "ADRIAN QUINCY LABOR"
To: firstname.lastname@example.org, email@example.com
Date: Wed, 25 Oct 1995 19:55:01 EST5EDT
A SierraNet Program
Uninterrupted Power Supply for CABECA gateway and dedicated local
nodes within the network
Early this year, 1995, the CABECA project visited Sierra Leone. A
computer was set up as a dedicated node within the Institute of Public
Adminstration and Management(IPAM), of the University of Sierra
Leone. This gateway is polled twice a week by GreenNet in London.
This is referred to as the IPAM/GreenNet or (CABECA) gateway in this
program brief. The project also donated a number of modems to the
university of Sierra Leone to distribute to the Libraries
and selected faculties. SierraNet and HealthNet (Boston) jointly
assessed the suitability of another gateway. This is referred to as
the SierraNet/HealthNet or (SierraNet) gateway. Both these gateway
will form the external (Internet) gateways within the
fidonet network conceived for university research. SierraNet has a
standby generator to serve the dedicated computer used.
Despite IPAM's proximity to State House, the CABECA gateway is
hampered by frequent power outages. This raises concerns for reliable
polling session. The dedicated computer at IPAM needs to be
operational during the period the GreenNet computer dials it.
There are three possible ways to solve this problem. One way is to
purchase an Uninterrupted Power Supply (UPS). These cost $1000 US and
can be obtained from local vendors in Freetown. It costs a lot less in
NorthAmerica. Another option is to invest in a solar panel and deep
cycle battery storage units. These are expensive. However $4000US
should provide a modest unit that can serve other computers. One such
unit is used by the Holron Computing LTD, in Freetown, to serve their
local area network. The National petroleum (NP) is suppose to be a
local agent for a London based company the sells these units.
The third option is to build uninterrupted power supply units using
(1) A set of normal cycle 12volt batteries (or Truck batteries)
(2) The AC supply from the National Power Authority
(3) An inverter, the main components of UPS. This will have to be
procured. The advantage here, is that UPS are created from less
expensive components and this can be duplicated for all the dedicated
nodes within the network being developed. Further more, load cycles
can be customized for each nodes according to the additional task it
performs. The load cycles ensure that battery units are replenished
and remain above a threshold value. This idea pieces together
suggestions from Dr Redwood Sawyerr, Engineering Department USL and Mr
Victor thomas of FT electronics. It is a viable option.
The CABECA committee estimates that Le10,000 (minimum)/month by each
connected department will be able to maintain the gateway and cover
international polling costs. SierraNet budgets $50 a month to cover
international polling costs.
Individuals, association and interested organizations interested in
1) Improving the CABECA gateway should contact
D. T. Chaytor
C/O Computer Studies Department
I.P.A.M Tower Hill
Freetown, Sierra Leone.
The lastest update on the IPAM gateway from D. T. Chaytor will be
follows this mail.
2) Interested in sponsoring the third option can contact
Adrian Q. Labor
3550 University Street
Montreal, Quebec H3A 2A7
We welcome your support
Adrian Q. Labor
SierraNet Project Coordinator
M.Eng Student, McGill University