Hi,
I talked to Dan Stanzione in ASU about their long range IB switches.
Apparently the product is close to becoming a real product, sounds like
they are beta testing as have units 0 and 1 !! They are using it for 1.5
miles at 10Gb presently and seeing latency <12us and feels
theoretically there is no distance limit. On my next trip to the US I
would like to visit them.
Pricing hasn't been nailed down completely but he thinks $15K per unit
should get us in the ballpark. Given that, ~$60K (4 units) for a fully
redundant LSST data link seems the perfect solution, should it be in
Chile. Obsedian are sending me a real quote soon, I guess they are still
finalising it thus the tardiness.
On the SPM side you would need something like a Cisco ONS switch to push
IP data down the fibre. The Longbow are not recommended for WAN IP
switched circuits. So I think you would be looking at ~$300K for a 10Gb
dwdm piece of hardware, less for 1Gb ccts but as the circuit is going to
be regened then you may as well go the 1 X 10Gb option, provided the
link provides that OC-192 bandwidth. And then of course you need spares.
Seems to me its going to be a tremendous cost to install the regened cct
across Baja and up the west coast, in wild country. Just hope they are
serious and the cost "guaranteed" to LSST.
In my mind the Chile option is best as we have control of the fibre and
the end equipment, and get what we need at a one time cost. (But I may
be biased)! There may also be ways to cut the cost of the fibre
installation, like getting a local Telecom to share and/or having AOSS
install the cable from Penyon to the road (~20Km) as they are our posts
already erected for power use.
Considering that we should, from above, have a 10Gb pair for LSST then
we could scale up pairs for Gemini, SOAR and CTIO keeping them all
separate, and still end up with a fibre bundle of <20 which is
comfortably spliceable in the rare event of a cut.
In fact given the price of the WAN longbow I would be all for,
converting Tololo and SOAR to IB networks. HCA prices should be down to
some acceptable level by 2010. <$200. Melanox is revising the cost every
quarter.
ron
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