http://forum.mikrotik.com/viewtopic.php ... 78#p408078
Small improvements are always necessary (if possible). And soldering poe-out is one of them.
I wonder, why are there such rumours about poe-out devices when every device can be poe-out right from manufacturing.
The ability to distribute power to other devices is good; the abilities to:
- turn power on & off remotely for individual ports;
- disable PoE for devices that are damaged by it; and
- isolate devices so that one shorted line doesn't cause a voltage drop that takes down all the other devices; all while
- maintaining product warranty
are sometimes useful too.
Its nice when an Omnitik can all do this, but sometimes it is the omnitik itself that needs a powercycle. Off course this would also count for a rb750UP but usually the omnitik plays a more important role in a network than a rb750UP would. An omnitik usually sits in top of a mast or tower where the 750 can be in a more reachable position. An Omnitik in need of a power cycle because it crashed or stalled would be more a network nightmare (since it probably has wireless clients associated, access-list, wireless settings etc.) than a simple remote powercycle of a rb750UP. I use these 750's only to power devices and pass traffic to them. No wireless, no client lists etc. If the 750 has gone, its simple to replace, even a basic configured unit can be used. Where the omnitik most probably needs a full mirror config from the one it has to replace. (Who is actually keeping a fully up-to-date backup copy of each AP to use in case of an emergency.... ?
I thougth so.)
I'll bet, in most network setups, a malfuncioning Omnitik is more a distaster than a malfunctioning 750. And the latter is probably faster to replace too.
I usually use a separate backhaul antenna to connect uplink and than the AP's and other units. If now the omnitik would supply power to the backhaul antenna, and the omnitik develops a problem, my backhaul probably is also going down and I need to go to the tower myself to do a power cycle. Not a desirable option....
In using a 750UP performing the power supply the change a malfuntioning omnitik bringing down the link towards that tower is gone. As long as the rb750 is up I can still remote power cycle the Omnitik and any other units. I can even have a fully automated powercycle script to manage the backhaul unit! (You can't have a script make the omnitik powercycle itself. Thats impossible. It just switches itself off. Total disaster!)
And because the 750UP has simpler tasks to perform the change it goes down is also smaller. (What about interferences or 'radio attacks' on the omnitik to disrupt it? The rb750 has no problems with that.)
Second big advantage of using a 750UP over an Omnitik for a 'do-it-all' solution; - Dual power input.... Use both the power plug and the PoE-in port for power supply. Use one as main and the other with an emergency backup powersource, and the change the 750UP goes down due a power supply issue is 50% less thant the single power intake option of the omnitik.
The use of a rb750UP (or better rb780UP with better voltage and overall consumption monitoring) would make it a much more versatile device than the omnitik for the same purpose...
Show your appreciation of this post by giving me Karma! Thanks.
Rudy R. Puister
WISP operator based on MT routerboard & ROS.