Yes, the first place to start is to determine the Alvarion specs. 1) Max
power or amperage draw from the Alvarion VLs, and 2) min and max Voltage
tolerance. I don;t have that answer for you. But please share it, when you
find out :-)
The general rule is, you can make a combine POE system to serve identical
distances as standalone POE systems. But you still ahve to do the math for
stnadalone POE system. For example, You can take a 48V POE up 500 feet
easilly, to deliver JUST POWER. But data will never go that high. If you
had to serve height beyond Ethernet POE specs, you'd then need to do the
Power extraction up in a NEMA box on the tower.
Again, we did not do it with Alvarion, but the way we did it was....
We took standard standalone POE injectors (ones without integrated PS).
Valemount Injectors that are black, square, one led, and sell for about
$5-$7.
This allowed us to have circuit board connecting both Ether jacks for
reliability.
These models allowed a wiretie to fit between the PS jack and the CAT5 plug,
so it could be asilly secured and easilly individually untied in the field.
We put one extra one inline for hot spare.
Now, we were doing 24v, so You need to confirm the injectors that you
selected allowed voltage level for Alvarion.
I know the little white half moons, can do 48V no problem.
If the standard 802.11 pin-out isn;t what Alvarion uses, then compensate
with the pin-out of the Plug crimping on.
We then laid them side by side mounted flat to a plywood strip.
We actually just screwed the Strip to the rack, because we cut it to reach
19" rack.
It could also be glued to a Nema Box back, with construction plywood roof
glue.
We cut the height of the strip about 6 inches, so we had 2 inched on top and
bottom to Staple patch cable in place, with it still having room to unplug.
IN one case we used screw in eye hooks, and then just strapped the cable to
the eye hook for strain relief.
We then took standard two strand wire and soldered the round plugs to them
(the kind that the standard POE required).
We then took two of those standard screw down DC bus bars (can be ordered
from any electrician or electronic store) with like 8-12 screws on thems,
and labeled them - and +. Then of course screwed down the wires to them.
(Just as easilly we could have soldered the eight wires togeather, so all
the cables were like a 8 cable bundled single unit.)
We then Used a thicker guage wire, I think it was 16-18 guage and ran that
from the Bud Bar to our dedicated power supply.
(Many power supply types available).
Whether it works is just doing the math of cable Voltage loss, and how much
amperage the cable can take. See AWG chart attached.
Also see POE calculater at
http://www.demarctech.com/techsupport/poecalculate.htm
Its importnat to remember that the Voltage loss is different based on the
amperage that is occuring at the time, so you don;t want to over power
voltage to compensate for the loss, to the extent that an inactive radio
would be delviered voltage greater than the radio could accept.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Cameron Kilton" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <[email protected]>
Sent: Thursday, October 09, 2008 1:18 PM
Subject: Re: [WISPA] Alvarion VL Rackmount
All of your questions Tom are important and have taken those into
consideration.
Right now, I just want to figure out if anybody has done it and how.
We have made a POE system that puts out 48volt and it works on the bench
with VL units, but when there is a significant cable run it stops
working, I guess the important thing to find out is what is the minimum
and maximum voltage that can be sent to a Alvarion VL or B radio?
-Cameron
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Randy Cosby
Sent: Thursday, October 09, 2008 1:07 PM
To: WISPA General List
Subject: Re: [WISPA] Alvarion VL Rackmount
I have got to put a plug in for the "SuperRMS". We just installed our
second unit. Just a great box for doing DC power control (or AC if you
want). Pricey, but very flexibile and powerful. Also has temperature,
voltage measurent, alarm contact monitoring, USB port with camera
drivers, alert and relay scripting, linux shell and on and on....
http://www.remotemonitoringsystems.ca/rms2/
Tom DeReggi wrote:
There are three questions that come up...
1) Redundancy
2) minimizing impact of failure
3) Ability to remote reboot.
We had chosen to stay with individual AC Adapter POE systems, for the
above
reasons.
The individual AC PS adapter plugged into the AC style Digital Logger
reboot
device.
If a PS fails, only one radio dies, and quick to replace the one PS
for $15.
And if a radio locks up, we can reboot the port via Digital logger.
Whether or not our device is located in the Closet, mid-way on tower,
or way
up the tower, its one standard method to remote access the devices,
and
power them.
So to run one cetnral power supply to power all radios.... How will
you
remote reboot them? And what will you do if the main Power supply
fails?
I'd only recommend doing a shared power supply if it was redundant
with a
ready to go spare (two units onsite). As well, you then need to
convert to
a DC based reboot device, and put the relays (or it) inline with the
power
to the POE.
Digital logger also makes a DC based model, with screw down panels.
This
device could be your method to combine the DC power. However not
positive
but this model might be 24V.
http://www.digital-loggers.com/din.html
.
I think Alvarions are 54-56V. Side note some of the old MEtrocom
installs
had used 54V powersupply power plants. You might be able to find them
used
cheap. I know we had picked up a few. (but didn;t have 54V gear)
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Cameron Kilton" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, October 09, 2008 8:29 AM
Subject: [WISPA] Alvarion VL Rackmount
I have a bunch of Stand Alone 5.8 VL AU gear, I want to make a 12
port
rack mount power supply for it. Has anybody tried this?
Thank You,
Cameron Kilton
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--
Randy Cosby
Vice President
InfoWest, Inc
office: 435-773-6071
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From: Thomas McGahee [SMTP:[EMAIL PROTECTED]
Sent: Wednesday, April 08, 1998 10:40 AM
To: Tesla-2; [EMAIL PROTECTED]
Subject: AWG WIRE TABLE for Coilers
Fellow Coilers,
Attached is a plain ASCII text file AWG2.TXT
This file contains a Wire Chart for AWG Gauge
wire from #0000 to #40. It has extra goodies that I
thought coilers would enjoy, such as Turns Per Inch
and Feet Per Pound as well as resistance values.
I do not usually send attachments with my posts to the
TESLA and TESLA-2 lists, but I decided to send this as
an attachment to ensure that it gets through intact,
as it is a table that is more than 120 characters wide.
To print it on paper you may need to print it in a small font
or in landscape mode.
As it is, you should print it using a monospaced font, such
as Courier. Otherwise It may not print out in columns properly.
I hope that this Table of wire info is useful to many of
you. If there is enough demand for it, I could modify
the program I wrote so that it would produce also a
metric table. But I wanted to get the inch-based version
out to all of you as soon as it was finished.
Hope this helps,
Fr. Tom McGahee
AWG AMERICAN WIRE GAUGE TABLE FOR BARE COPPER WIRE
Compiled by Fr. Thomas McGahee [EMAIL PROTECTED]
This Table may be copied freely so long as credit is given to the author.
Originally compiled for use by those building Tesla coils on the TESLA and
TESLA-2 internet mailing lists.
Compiled in April 1998 based on information derived from various sources.
Since there were some discrepancies between data sources, the author has chosen
not to just copy the numbers found in those sources, but rather to write a
program that would generate the data based on a Best Fit mathematical model.
The author has checked the Diameter in mils results against the data contained
in the
MACHINERY'S HANDBOOK, Twenty-First Edition, 1982, published by Industrial Press
Inc.
All numbers shown are accurate to +/- 1 in the least significant digit position.
Column headings have been repeated to make the list more readable
AWG = American Wire Gauge size from 0000 to 40
Dia-mils = Diameter in mils (1 mil = .001 inch)
TPI = Turns Per Inch [Note that this is for BARE WIRE. Insulation thickness
varies]
Dia-mm = Diameter in millimeters. This was included to help when dealing with
metric Coilers.
Circ-mils = Cross sectional Area in Circular Mils. ( circular mils = diameter
in mils squared )
Ohms/Kft = Ohms Per 1,000 ft.
Ft/Ohm = Number of feet required for 1 Ohm of resistance
Ft/Lb = Feet Per Pound
Ohms/Lb = Ohms Per Pound
Lb/Kft = Pounds Per 1,000 feet
*AMPS = Conservative Amp Rating based on 750 circulare mils per Amp
MaxAmps = Maximum allowable current based on 500 circular mils per Amp. Do NOT
exceed this rating.
AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb
Ohms/Lb Lb/Kft *Amps MaxAmps
0000 459.99 2.1740 11.684 211592 0.0490 20402 1.5613
0.0001 640.48 282.12 423.18
000 409.63 2.4412 10.405 167800 0.0618 16180 1.9688
0.0001 507.93 223.73 335.60
00 364.79 2.7413 9.2657 133072 0.0779 12831 2.4826
0.0002 402.80 177.43 266.14
AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb
Ohms/Lb Lb/Kft *Amps MaxAmps
0 324.85 3.0783 8.2513 105531 0.0983 10175 3.1305
0.0003 319.44 140.71 211.06
1 289.29 3.4567 7.3480 83690 0.1239 8069.5 3.9475
0.0005 253.33 111.59 167.38
2 257.62 3.8817 6.5436 66369 0.1563 6399.4 4.9777
0.0008 200.90 88.492 132.74
3 229.42 4.3588 5.8272 52633 0.1970 5075.0 6.2767
0.0012 159.32 70.177 105.27
4 204.30 4.8947 5.1893 41740 0.2485 4024.7 7.9148
0.0020 126.35 55.653 83.480
5 181.94 5.4964 4.6212 33101 0.3133 3191.7 9.9804
0.0031 100.20 44.135 66.203
6 162.02 6.1721 4.1153 26251 0.3951 2531.1 12.585
0.0050 79.460 35.001 52.501
7 144.28 6.9308 3.6648 20818 0.4982 2007.3 15.869
0.0079 63.014 27.757 41.635
8 128.49 7.7828 3.2636 16509 0.6282 1591.8 20.011
0.0126 49.973 22.012 33.018
9 114.42 8.7396 2.9063 13092 0.7921 1262.4 25.233
0.0200 39.630 17.456 26.185
AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb
Ohms/Lb Lb/Kft *Amps MaxAmps
10 101.90 9.8140 2.5881 10383 0.9989 1001.1 31.819
0.0318 31.428 13.844 20.765
11 90.741 11.020 2.3048 8233.9 1.2596 793.93 40.122
0.0505 24.924 10.978 16.468
12 80.807 12.375 2.0525 6529.8 1.5883 629.61 50.593
0.0804 19.765 8.7064 13.060
13 71.961 13.896 1.8278 5178.3 2.0028 499.31 63.797
0.1278 15.675 6.9045 10.357
14 64.083 15.605 1.6277 4106.6 2.5255 395.97 80.447
0.2031 12.431 5.4755 8.2132
15 57.067 17.523 1.4495 3256.7 3.1845 314.02 101.44
0.3230 9.8579 4.3423 6.5134
16 50.820 19.677 1.2908 2582.7 4.0156 249.03 127.91
0.5136 7.8177 3.4436 5.1654
17 45.257 22.096 1.1495 2048.2 5.0636 197.49 161.30
0.8167 6.1997 2.7309 4.0963
18 40.302 24.813 1.0237 1624.3 6.3851 156.62 203.39
1.2986 4.9166 2.1657 3.2485
19 35.890 27.863 0.9116 1288.1 8.0514 124.20 256.47
2.0648 3.8991 1.7175 2.5762
AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb
Ohms/Lb Lb/Kft *Amps MaxAmps
20 31.961 31.288 0.8118 1021.5 10.153 98.496 323.41
3.2832 3.0921 1.3620 2.0430
21 28.462 35.134 0.7229 810.10 12.802 78.111 407.81
5.2205 2.4521 1.0801 1.6202
22 25.346 39.453 0.6438 642.44 16.143 61.945 514.23
8.3009 1.9446 0.8566 1.2849
23 22.572 44.304 0.5733 509.48 20.356 49.125 648.44
13.199 1.5422 0.6793 1.0190
24 20.101 49.750 0.5106 404.03 25.669 38.958 817.66
20.987 1.2230 0.5387 0.8081
25 17.900 55.866 0.4547 320.41 32.368 30.895 1031.1
33.371 0.9699 0.4272 0.6408
26 15.940 62.733 0.4049 254.10 40.815 24.501 1300.1
53.061 0.7692 0.3388 0.5082
27 14.195 70.445 0.3606 201.51 51.467 19.430 1639.4
84.371 0.6100 0.2687 0.4030
28 12.641 79.105 0.3211 159.80 64.898 15.409 2067.3
134.15 0.4837 0.2131 0.3196
29 11.257 88.830 0.2859 126.73 81.835 12.220 2606.8
213.31 0.3836 0.1690 0.2535
AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb
Ohms/Lb Lb/Kft *Amps MaxAmps
30 10.025 99.750 0.2546 100.50 103.19 9.6906 3287.1
339.18 0.3042 0.1340 0.2010
31 8.9276 112.01 0.2268 79.702 130.12 7.6850 4145.0
539.32 0.2413 0.1063 0.1594
32 7.9503 125.78 0.2019 63.207 164.08 6.0945 5226.7
857.55 0.1913 0.0843 0.1264
33 7.0799 141.24 0.1798 50.125 206.90 4.8332 6590.8
1363.6 0.1517 0.0668 0.1003
34 6.3048 158.61 0.1601 39.751 260.90 3.8329 8310.8
2168.1 0.1203 0.0530 0.0795
35 5.6146 178.11 0.1426 31.524 328.99 3.0396 10480
3447.5 0.0954 0.0420 0.0630
36 5.0000 200.00 0.1270 25.000 414.85 2.4105 13215
5481.7 0.0757 0.0333 0.0500
37 4.4526 224.59 0.1131 19.826 523.11 1.9116 16663
8716.2 0.0600 0.0264 0.0397
38 3.9652 252.20 0.1007 15.723 659.63 1.5160 21012
13859 0.0476 0.0210 0.0314
39 3.5311 283.20 0.0897 12.469 831.78 1.2022 26496
22037 0.0377 0.0166 0.0249
AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb
Ohms/Lb Lb/Kft *Amps MaxAmps
40 3.1445 318.01 0.0799 9.8880 1048.9 0.9534 33410
35040 0.0299 0.0132 0.0198
------------------------
From [EMAIL PROTECTED] Sep 2 13:01:29 1995
Date: Mon, 28 Aug 1995 22:24:22 -0600
From: Richard Quick <[EMAIL PROTECTED]>
Reply to: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: AWG Wire Chart
AWG D.C. OHMS WIRE DIAM APPROX. TURNS PER FEET PER
SIZE PER 1000 FT INCHES INCH, SOLID ENAMEL POUND
COVERED
1 .1264 .2893 X 3.947
2 .1593 .2576 X 4.977
3 .2009 .2294 X 6.276
4 .2533 .2043 X 7.914
5 .3195 .1819 X 9.980
6 .4028 .1620 X 12.58
7 .5080 .1443 X 15.87
8 .6405 .1286 7.6 20.01
9 .8077 .1144 8.6 25.23
10 1.018 .1019 9.6 31.82
11 1.284 .0907 10.7 40.12
12 1.619 .0808 12.0 50.59
13 2.042 .0720 13.5 63.80
14 2.524 .0641 15 80.44
15 3.181 .0571 16.8 101.40
16 4.018 .0508 18.9 127.90
17 5.054 .0453 21.2 161.3
18 6.386 .0403 23.6 203.4
19 8.046 .0359 26.4 256.5
20 10.13 .0320 29.4 323.4
21 12.77 .0285 33.1 407.8
22 16.20 .0253 37.0 514.2
23 20.30 .0226 41.3 648.4
24 25.67 .0201 46.3 817.7
25 32.37 .0179 51.7 1031
26 41.02 .0159 58.0 1300
27 51.44 .0142 64.9 1639
28 65.31 .0126 72.7 2067
29 81.21 .0113 81.6 2607
30 103.7 .0100 90.5 3287
31 130.9 .0089 101 4145
32 162.0 .0080 113 5227
33 205.7 .0071 127 6591
34 261.3 .0063 143 8310
35 330.7 .0056 158 10480
36 414.8 .0050 175 13210
37 512.1 .0045 198 16660
38 648.2 .0040 224 21010
39 846.6 .0036 248 26500
40 1079 .0031 282 33410
41 1323 .0028
42 1659 .0025
43 2143 .0022
44 2593 .0020
45 3348 .00176
46 4207 .00157
47 5291 .00140
************************************************************************
For winding Tesla secondary coils the general consensus is to use
number 22 AWG, or larger diameter, double Formvar Magnet wire. Often
surplus partial spools of odd wire sizes are found, so I took time to
post a more complete chart of AWG numbers and fractional diameters
than is usually available. All information above is approximate
despite the decimal places. Wire diameter, turns per inch, resistance,
feet per pound, etc. all vary slightly from one manufacturer to another.
Insulation thicknesses will vary depending upon type and the supplier.
Turns per inch will also vary with the quality of the winding. In
practice, Tesla coil windings are not perfect (nor do they need to be)
so expect some slight variations from the specification table above.
Richard Quick
.. If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12
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