[LINK] VDSL/FTTN alternative to NBN-GPON - variation in temperature and reliability

[Paul Brooks]

On 23/04/2013 11:17 AM, Nick Ross wrote:
> Hi Robin,
>
> Did anyone follow up on this? It's a very interesting point. I've asked the
> question of some FTTN cabinet specialists.
>
> I've heard enough about datacenters to know that some flavours of the newer
> ones are designed to run very hot indeed - the electronics can cope with it.
>
> However, I asked about cooling i cabinets before and was told that they
> have several fans in them. But that's surely not going to cut it in an
> Australian summer? Or any perma-hot parts of Australia???

Nick -
The brochure for Alcatel-Lucent's gear (7330 ISAM) indicates it is tolerant to
extended temperature range - -40C to +65C.
Hottest recorded air temperature in Australia is +50.7C (Oodnadatta, 1960).

A cabinet in the direct sun will rise in temperature beyond that and start to radiate
heat internally, but with a layer of insulation wool against the inner skin of the
cabinet, and sufficient fans to draw in outside air and keep the air temp inside close
to the outside air temp, the equipment should be OK.
Mitigation in very hot climate areas could be to locate the cabinets on the southern
side of buildings or trees, so that they are in the shade during the hottest parts of
the day - that helps a lot in keeping the internal temps down.

Too many days like that might shorten the lifetime of the batteries, but its not as if
anything is likely to catastrophically break if the temp rises above a certain
threshold - the lifetime might be a few years shorter than at more temperate climes,
but thems the breaks.

P.