Re: POE networking, what's the range?
> > The garage and the house are over 1/10 of a mile apart? > > yeah. it's not a car garage. ... > I don't plan to string cable at all. Cable is already in place > for all the electric stuff. IOW the cat5 between the buildings is already in place? In that case, and supposing whoever put it in knew what s/he was doing, the safety issues should have been taken care of. There's still the matter of the 100m distance spec, but as others have mentioned that is not a hard and fast rule in practice. I have personally seen 10Base-2 (RG58 coax) work very well on a segment that was well over twice the 200m maximum length specified for that technology. If 10/100Base-T are equally robust, you might get by with a 200m run (esp. if you run only 10Mb over cat5, which is capable of handling 100Mb, and/or if nothing else in the same collision domain has anywhere near a maximum-length run). I would guess that POE might still have problems, separate from the Ethernet signal-distance limits, due to power loss in the wiring. The POE-powered device would likely have been designed to allow for the loss in 100m of the cat 5 pair that's being used to supply the power. You've got about twice that distance, thus about twice the voltage drop at any given current consumption. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
On 10/7/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > ... does anyone know the range of Power Over Ethernet? I want > > something to go from my house to my garage apartment then hook > > a wireless access point in to the POE box. The garage and the > > house are on their own power circuit but where the lines split > > is in between the house and the garage. I'm thinking it'll be > > around 600ft plus all the wiring in the house and garage. The garage and the house are over 1/10 of a mile apart? yeah. it's not a car garage. > If your garage has power, why not just plug the access point into > an outlet in the garage instead of pulling power all the way from > the house? There can be some significant safety issues in stringing copper between buildings, especially over significant distances and if the building grounds are not interbonded. I'd encourage the O.P. to first consult a local electrical inspector, or an electrician who is familiar with the local conditions and safety codes. Yes, I know this is not mains power, but hazards exist with signal wiring as well. I don't plan to string cable at all. Cable is already in place for all the electric stuff. One alternative would be to track down a couple of fiber adapters, and string (non-conductive) fiber instead of copper. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
[EMAIL PROTECTED] wrote: >>> ... does anyone know the range of Power Over Ethernet? I want >>> something to go from my house to my garage apartment then hook >>> a wireless access point in to the POE box. The garage and the >>> house are on their own power circuit but where the lines split >>> is in between the house and the garage. I'm thinking it'll be >>> around 600ft plus all the wiring in the house and garage. >>> > > The garage and the house are over 1/10 of a mile apart? > > >> If your garage has power, why not just plug the access point into >> an outlet in the garage instead of pulling power all the way from >> the house? >> > > There can be some significant safety issues in stringing copper > between buildings, especially over significant distances and if > the building grounds are not interbonded. I'd encourage the O.P. > to first consult a local electrical inspector, or an electrician > who is familiar with the local conditions and safety codes. Yes, > I know this is not mains power, but hazards exist with signal > wiring as well. > > I don't know the numbers either, but you should let him know the basic facts of the Ethernet environment: it's not power limited, it's TIME limited. The signal power goes down at a relatively low rate over distance, but the time that the ethernet signal takes to transit, that's a key limiter. You see, Ethernet is a protocol that relies on a bunch of time-relationships, both to support stuff like direct error control, but of most importance, in supporting the detection of collision occurrence (Ethernet allows signal collisions by being VERY good at detecting and handling such items). The way you figure limitations on ethernet is, you get tables of how fast your signal propagates over the cable you've chosen, and see if your cable allows your signal to get that far in that much time. It's the time that's key. If (now that I've probably embarrassed some of the walking encyclopedias we have around here) you come up with the kind of cable you have, we could very easily look into a table and tell you how much your setup will allow you. If you don't get an answer by tomorrow, I think I could probably find it here somewhere, with enough of a lookup. Don't bother the fellows with power numbers, that will only confuse the issue, believe me, power has nothing to do with it. > One alternative would be to track down a couple of fiber > adapters, and string (non-conductive) fiber instead of copper. > ___ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "[EMAIL PROTECTED]" > > ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
> > ... does anyone know the range of Power Over Ethernet? I want > > something to go from my house to my garage apartment then hook > > a wireless access point in to the POE box. The garage and the > > house are on their own power circuit but where the lines split > > is in between the house and the garage. I'm thinking it'll be > > around 600ft plus all the wiring in the house and garage. The garage and the house are over 1/10 of a mile apart? > If your garage has power, why not just plug the access point into > an outlet in the garage instead of pulling power all the way from > the house? There can be some significant safety issues in stringing copper between buildings, especially over significant distances and if the building grounds are not interbonded. I'd encourage the O.P. to first consult a local electrical inspector, or an electrician who is familiar with the local conditions and safety codes. Yes, I know this is not mains power, but hazards exist with signal wiring as well. One alternative would be to track down a couple of fiber adapters, and string (non-conductive) fiber instead of copper. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
In the last episode (Oct 07), Michael Johnson said: > This isn't really a FreeBSD-specific question but does anyone know > the range of Power Over Ethernet? I want something to go from my > house to my garage apartment then hook a wireless access point in to > the POE box. The garage and the house are on their own power circuit > but where the lines split is in between the house and the garage. I'm > thinking it'll be around 600ft plus all the wiring in the house and > garage. I'm kinda hesitant to buy one and try it before I *think* it > may work. If your garage has power, why not just plug the access point into an outlet in the garage instead of pulling power all the way from the house? As for your 600ft limit, the cable length everyone says Ethernet has is 300 feet, but that's really to allow collision detection to work. All the documents I have found explicitly say "half-duplex segment length is 100m". They then go on to mention full-duplex links but never give a length for them :) With everything being switched nowadays, maybe the limit is really determined by signal loss. At least one person has reported success at 850 feet at 10mbit: http://groups.google.com/[EMAIL PROTECTED] http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ethernet.htm -- Dan Nelson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
On 10/7/06, Joe Marcus Clarke <[EMAIL PROTECTED]> wrote: On Sat, 2006-10-07 at 13:40 -0400, Michael Johnson wrote: > This isn't really a FreeBSD-specific question but does > anyone know the range of Power Over Ethernet? I want > something to go from my house to my garage apartment > then hook a wireless access point in to the POE box. The > garage and the house are on their own power circuit but > where the lines split is in between the house and the garage. > I'm thinking it'll be around 600ft plus all the wiring in the house > and garage. I'm kinda hesitant to buy one and try it before > I *think* it may work. 600 ft will be too much. POE (802.3af) works over Cat 5 which limits you to 328 feet or 100 meters. What about a good wireless access point? I have 2 linksys wrt54g's in the house now and one has the 7db gain antennas (which really doesn't do much) on it. I'd want at least 700ft+ range and it be able to go through multi-walls, trees, etc. I know there's lots of access points out there that could do this, but which one? I've looked at outdoor antennas, wireless access point that also works as a wireless bridge (can't find many of these) also. There is too many different options to go with and I don't know which one to go with. Michael Joe -- PGP Key : http://www.marcuscom.com/pgp.asc ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
On Sat, Oct 07, 2006 at 01:40:37PM -0400, Michael Johnson wrote: > This isn't really a FreeBSD-specific question but does > anyone know the range of Power Over Ethernet? I want > something to go from my house to my garage apartment > then hook a wireless access point in to the POE box. The > garage and the house are on their own power circuit but > where the lines split is in between the house and the garage. > I'm thinking it'll be around 600ft plus all the wiring in the house > and garage. I'm kinda hesitant to buy one and try it before > I *think* it may work. For normal Ethernet cables (carrying data) the maximum length of a cable is 100 meters (328 ft.) I would not count on PoE working over longer distances than that. -- Erik Trulsson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: POE networking, what's the range?
On Sat, 2006-10-07 at 13:40 -0400, Michael Johnson wrote: > This isn't really a FreeBSD-specific question but does > anyone know the range of Power Over Ethernet? I want > something to go from my house to my garage apartment > then hook a wireless access point in to the POE box. The > garage and the house are on their own power circuit but > where the lines split is in between the house and the garage. > I'm thinking it'll be around 600ft plus all the wiring in the house > and garage. I'm kinda hesitant to buy one and try it before > I *think* it may work. 600 ft will be too much. POE (802.3af) works over Cat 5 which limits you to 328 feet or 100 meters. Joe -- PGP Key : http://www.marcuscom.com/pgp.asc signature.asc Description: This is a digitally signed message part
