GLC
04-18-2008, 03:44 PM
hi again
who tested the POE of NS on 60meters or more cat5 cable ??
i have some problem on this ...
who tested the POE of NS on 60meters or more cat5 cable ??
i have some problem on this ...
View Full Version : POE
nemecio
04-18-2008, 07:41 PM
You better get ready to get your power closer to the NS....
Remember cat 5 is 24 gauge cable and the voltage drop over 60 mts of cable is significant...
Saludos,
Nemecio
Remember cat 5 is 24 gauge cable and the voltage drop over 60 mts of cable is significant...
Saludos,
Nemecio
cz_ranger
04-18-2008, 11:59 PM
We have done POE over 200m of CAT5 UTP, but that is done using 48V and stabilizing the output to 12V at the end....
Tom
Tom
Kameil
04-24-2008, 04:01 AM
what is the maximum cable length with the defult POE??
i am NEW with NS2, using CAT5 length 40mtrs its shows the ping result absolutly fine.but when i click on any tab it reboots???
kindly suggest.
Kameil
i am NEW with NS2, using CAT5 length 40mtrs its shows the ping result absolutly fine.but when i click on any tab it reboots???
kindly suggest.
Kameil
zygut
12-26-2008, 01:13 PM
Yeah, I'm wanting to try 100 feet of cat5e for the PoE, I am now wondering if this will work.
I found online some info that said that things depend on the device and the type of cable, but that the general range that passive PoE can transfer power is about 30-40 meters/100-130 feet.
Another site says that at 200M, you lose maybe 4 or 6 volts. At 48VDC, that leaves you with 42 volts. You can determine the amount of voltage drop over a distance by finding the resistance of the cable for a specific temperature (given in ohms/1000ft) from the cable manufacturer or electrical wholesaler. If you know the largest amount of current that will flow in the cable, when use the formula: Vdrop = Current X Distance (Ft) X 2 X Ohms per 1000Ft.
As a rule of thumb you will loose 6V per every 100′ - 200′ of wiring, depending on the gauge. Lower power also means more amperage means more heat and perhaps issues with the 24 gauge wires in CAT5. You may need to use 18 gauge wiring. For all intensive purposes anything greater than 400′ use a 48V POE.
I cannot vouch for this information, I just found it through searching online.
I found online some info that said that things depend on the device and the type of cable, but that the general range that passive PoE can transfer power is about 30-40 meters/100-130 feet.
Another site says that at 200M, you lose maybe 4 or 6 volts. At 48VDC, that leaves you with 42 volts. You can determine the amount of voltage drop over a distance by finding the resistance of the cable for a specific temperature (given in ohms/1000ft) from the cable manufacturer or electrical wholesaler. If you know the largest amount of current that will flow in the cable, when use the formula: Vdrop = Current X Distance (Ft) X 2 X Ohms per 1000Ft.
As a rule of thumb you will loose 6V per every 100′ - 200′ of wiring, depending on the gauge. Lower power also means more amperage means more heat and perhaps issues with the 24 gauge wires in CAT5. You may need to use 18 gauge wiring. For all intensive purposes anything greater than 400′ use a 48V POE.
I cannot vouch for this information, I just found it through searching online.
WHT
12-26-2008, 01:35 PM
"As a rule of thumb you will loose 6V per every 100′ - 200′ of wiring, depending on the gauge."
Taken at face value, that would be incorrect as the device's loading isn't specified.
For example..and I just tried it on my bench...I connected a 12 volt UNBT power supply to a new box of 1,000 foot CAT5e's white/brown pair. At the power supply end, I measured 12.3 volts and at the end of the cable I measured 12.3 volts also. Since the voltmeter has a 20,000 ohm per volt sensitivity, its current load is only 50 microamps, not 1 amp like a Nanostation.
The general consensus here is you can use the UBNT supplied 12 volt adapter up to 100 to 150 feet, but past that people are using an after market 18 to 24 volt supply.
[Edited - link added: http://www.ubnt.com/support/poe.php]
Taken at face value, that would be incorrect as the device's loading isn't specified.
For example..and I just tried it on my bench...I connected a 12 volt UNBT power supply to a new box of 1,000 foot CAT5e's white/brown pair. At the power supply end, I measured 12.3 volts and at the end of the cable I measured 12.3 volts also. Since the voltmeter has a 20,000 ohm per volt sensitivity, its current load is only 50 microamps, not 1 amp like a Nanostation.
The general consensus here is you can use the UBNT supplied 12 volt adapter up to 100 to 150 feet, but past that people are using an after market 18 to 24 volt supply.
[Edited - link added: http://www.ubnt.com/support/poe.php]
