Alastair Johnson wrote:
As Matthew pointed out, most of Vector's edges
*used to be* Cisco
Cat 2900/3500/3750, which typically consume more in the 250W-750W
Usually quite a bit less than that, unless you're running PoE. Cisco
make the Metro Ethernet Equiv that can run on 48v.
Interestingly, telcos that deploy SDH mux equipment to
tend to install them with a full 48V DC plant, including rectifiers and
often inverters. Perhaps the MetroE guys need to take a look at how the
telcos have done it in the past, if they are wanting to meet that 'five
nines' of telco-land?
SDH equipment typically has some nice things for
mananging dry contact
alarms. This means you can have a relatively dumb rectifier whereas in
an ethernet world you need to move up to a managed 48v rectifier system
to get an ethernet port. There's quite a price difference. It's also
noticable that low end SDH gear has plumeted in price. So the total
cost maybe lower than expected. Our experience with 48v rectifier
systems (same box but in different locations, including remote microwave
towers and cabinets) has been very good - very reliable but there aren't
cheap ones (AU$2k+ plus batteries).
GEPON used with low amounts of splitting allows quite cost effective,
low fibre utilization passive solution - only CPE is at the customer
end. There are some very cool systems out there to do this and even run
E1s across them for voice.
Matthew Moyle-Croft Internode/Agile Peering and Core Networks
Level 4, 150 Grenfell Street, Adelaide, SA 5000 Australia
Email: mmc(a)internode.com.au Web: http://www.on.net
Direct: +61-8-8228-2909 Mobile: +61-419-900-366
Reception: +61-8-8228-2999 Fax: +61-8-8235-6909