Re: rack rails

[Baldur Norddahl <baldur.norddahl () gmail com>]

I have to deal with the slightly annoying ETSI racks also sometimes called
21 inch racks. As a french invention it is naturally not actually 21 inches
but 500 mm between inside of rails and 535 mm outside, with 535 mm being
very close to 21 inches.

Although I love the idea of using metric all I ever do is installing
adapters, so I can mount 19 inch rack equipment. A waste really.

Regards

Baldur


man. 30. mar. 2020 23.49 skrev Shawn L via NANOG <nanog () nanog org>:

> That's a tough one.  In the telco space, the common sizes are 19" and
> 23".  19" for gear, 23" for fiber patch panels, etc.  There are also some
> 25" floating around (Nortel, I'm looking at you).
>
>
>
> Unfortunately, 19" gear fits in 19" racks.  It fits in 23" sometimes -- if
> the manufacture makes both size ears, or you have to use an adapter plate,
> which can be a pain, and expensive (for 25" you may as well find a local
> machine shop to make them for you, or it's cheaper to remove them and start
> over).
>
>
>
> Sometimes you can do 19" gear and 23" cable management in a 23" rack,
> which is nice.  There is also the telco proclivity to attach stand-offs on
> the back side of the rack for vertical cabling, which can take up even more
> space.
>
>
>
> The one thing you really can't do is take servers, etc. designed for a
> cabinet or 4-post style rack and put them in a 2-post neatly.  There's
> adapters and things, but they're a pain as well.  At least with a 4-post
> square-hole rack you can get 80% of what you want to fit.
>
>
> -----Original Message-----
> From: "Coy Hile" <coy.hile () coyhile com>
> Sent: Monday, March 30, 2020 5:31pm
> To: "Karsten Elfenbein" <karsten.elfenbein () gmail com>
> Cc: "NANOG" <nanog () nanog org>
> Subject: Re: rack rails
>
>
>
> > On Mar 30, 2020, at 5:24 PM, Karsten Elfenbein <
> karsten.elfenbein () gmail com> wrote:
> > Hi,
> >
> > something like https://www.opencompute.org/projects/rack-and-power
> > comes into my mind for that.
> > Mounting on 4 posts should be the default. It is insane what some
> > vendors want to mount on 2 posts only.
>
> That brings up an interesting question. As I understand it, the penchant
> for two-post mounts come from what are at least colloquially termed telco
> racks that are or were common when you had tons of modem banks and such.
> Are such mounts — much like DC power — still quite common in the service
> provider space, or do most use more or less normal racks? (That said, the
> 750mm wide (29.5in) racks that actually have room for high density cables
> inside the rack seem much more useful for a networking application than the
> 600mm wide version.)
>
>
>
> --
> Coy Hile
> coy.hile () coyhile com