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 region. Usually quite a bit less than that, unless you're running PoE. Cisco do make the Metro Ethernet Equiv that can run on 48v. Interestingly, telcos that deploy SDH mux equipment to customer sites 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. MMC -- 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