Re: rack power question

A close second might be liquid cooled air tight cabinets with the air/water heat exchangers (redundant pair) at the bottom where leaks are less of an issue (drip tray, anyone? :) )... Something like what you suggest has been around for a year or two now, though using liquid CO2 as the

Re: History of the EPO (Emergency Power Off)

Many years ago when we were much, much smaller, the EPO was wired to a special EPO circuit breaker on the main panel which fed the subpanel for the datacenter room. A short on that breaker was like pressing the test switch on a GFCI breaker. Do most people who do have functional (as opposed

Re: Telecom Convertors for DS1/DS3 signals

I am looking for recommendations for devices that can take a DS3 signal from a carrier via coax, convert it to optical so I can use fiber across buildings to transport the signal, www.mrv.com/dl.php?prod=FD type=A4PDF72file=MRV-FD-SF will do a T3 on a single fiber, but many similar

Re: Routers for CO OOB management network

I need to select a router to install in each of our CO's to bring together a network of T-1 between our colos. Look to Ebay or similar for 2500's with dual V.35. Either find them with DC supplies or buy DC supplies as spares. The DC version has only one inlet, but it is trivial to bridge an

Re: Black box that allows just an A or B DC feed

You just need two suitably large diodes. Big ones need heatsinks. You will find some of the rack-top fuse panel makers that include diode OR-ing their main A and B feeds. No switchover time at all. The power is just there. Pretty sure Telect has some. Beware of Hendry. Good stuff, but savagely

Re: DWDM interconnects

DWDM comes in many flavors, and I doubt it makes much sense to hand another carrier a fiber with a lot of different lambdas on it (if that is what you were asking). There are way too many variables. OTOH, if you were simply refering to buying the use of one wave (or lambda) that is a normal

Re: DC power versus AC power

A few points: Below 50 volts, anyone can do the wiring. No licensed electrician is needed im most jurisdictions. Total fault current available determines the damage that will be done when something like a wrench falls across bus bars. Time, too, counts. If you can't vaporize the whole wrench

Re: How do you stop outgoing spam?

A twist we saw spammers using on dialup accounts in Miami could come to cyber cafes and could be ugly. They were dialing in and then using the IP address to send spam out some other connection elsewhere where RPF wasn't in use. The return packets all came back on their dialup into us, but

Re: Sheilded Cat-5E Ground Loop - Myth or Reality?

None of his is specific to Cat-5e installations but is common to ALL electrical installations. This does NOT apply to telco cables run outside, often run on the same poles parallel to power wires for miles, grounded at many points in a MGN (Multi Grounded Neutral) environment where, like it

Re: long distance gigabit ethernet

The Cerent 454 (now cisco 15454) has 2 port Gig-E cards that cost a little more than a PA-GE card. The pair of ports shares OC-12 available to that slot (I'm assuming this is NOT an OC-192 equipped shelf) and the bandwidth can be split in certain multiples of STSes (OC-1), or used totally for