1524, how many Lightning Arrestors?

We want - based on customer requirements - to protect the outdoor APs and the infrastructure behind them from transient voltage surges and near-miss lightning.
I read in this forum that it is better to protect the infrastructure behind the APs by inserting a fiber link in between but we have to meet our customer requirements and protect the AP itself, which makes more sense.
The questions I have are the following:
Our APs are 1524SB's with two 5GHz antennas and 3 2.4GHz antennas. How many lightning arrestors should we use?
The connector type for the AP and antenna is N-type. The only lightning arrestor from Cisco is AIR-ACC245LA-R and it has an RP-TNC connector which is incompatible. Any recommended 3rd party item like Cushcraft or PolyPhaser? What is the part number to be used?

When I had to use external antennas connected back to the ap via lmr cable, we used one per antenna connection. Bridge requirements vary from manufacture. Some require arrestors outside and at times another one located inside.
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I have properly managed to connect to my database and executa a query which returns a ResultSet object. By using the next() method I would like to populate an array with the results of my query using a while loop. All of this works fine. One problem persists however. I would like to know how many rows my query has so I can creat my array with the correct number , i.e if the query has 10 rows then the array should be String[] Array = new String[10].
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Thanks

Darn, just after I posted this I was struck by lightning and found an answer. The ResultSet isnt destroyed its just that the marker is at the end efter looping through a while loop, so if you want to loop again you have to the the marker to move to the absolute beginning.. thsi can be done using ResultSet.beforeFirst() which nice and neatly pops the marker back to its initial state.
Sorry for bothering everyone.

Lightning Arrestors for 3G Antennas

CSC,
I have a question on the lightning arrestors for 3G antennas. I think I may have found a typing error in the technical data. We have purchased a 3G-ANTM-OUT-COMBO which comes with a 3G-ANTM-OUT-OM outdoor omni-directional antenna and a lightning arrestor. The lightning arrestor in the COMBO is a AIR-ACC245LA-R, as shown in the link below:
http://www.cisco.com/en/US/docs/wireless/lightning_arrestor/installation/guide/hslar.html
On inspection of figure 1 in the link, it shows that the protected side is the TNC male end, the one with the thread for the ground lug. The one I have received, although it has the same part number, has the thread for the ground lug on the TNC female end.
When searching cisco.com for further information on the correct installation of the lightning arrestor, I found the following 3G-ACC-OUT-LA product. See link below:
http://www.cisco.com/en/US/docs/routers/access/wireless/hardware/notes/3glar.html
Looking at figure 1 on the above link, the lightning arrestor looks like the one I have received. The table for figure 1 indicates that the protected side is labelled as 4, the TNC female end, but the technical specifications state that the protected side is the TNC male.
Can someone please clarify if this is a potential error and what the correct orientation should be. I am assuming that the TNC male end should be the protected side, so that you can either attach it to the 3G device e.g. router or use an interconnection cable e.g. 3G-CAB-ULL-20. The cable comes with a TNC male and TNC female at either end.
Kind regards,
Ian

From an electrical engineering perspective assume we have 3 points of entry to the 1522, power, data and antenna. Each of these can transmit a lightning surge to downstream devices ie a switch or an upstream device the ap.
Generally the antenna will be the most vulnerable point of the installation to lightning strikes. If there is no surge suppression between the antenna and the ap then the ap can be damaged, also it can potentially transmit that surge down the data cabling, assuming the power cabling is protected as you say it should protect in both directions on the power side, but not always.
This probably means it can manage surges into the ap from the power side from a strike to transmission equipment and the transient overvoltages that may be caused.
Worst cast scenario your antenna gets a direct hit, the ap fails, the voltage is transmitted down the data cabling and takes out the 6500 its directly connected to! Nobodies going to say you done a great job and were just unlucky and you wont be winning any popularity contests
Its a question of risk, with an inline arrestor on the antenna cable you are protecting your ap etc. If its on a building and not the highest point its unlikely to get a direct hit. If its on a lighting column and the antenna is the highest point its possible. How much lightning do you get?
Not sure thats any help!

Lightning arrestor / fiber segment

Does anyone know?
I'm mounting patch antennas on an outside wall, drilling a small hole in wall, and connecting the antennas to a 1200AP on the inside wall. I plan on setuping up a fiber segment on the cable run to the switch. My questions, 1) Should I install lightning arrestors between the antenna cable and RP-TNC connectors? 2) How long distance should the fiber segment be? Thank you.

Nope, I missed that point. The (so-called)lightning arrestors should preferably be kept outside on the antenna-side of the fiber link, with the grounding system also outside, if at all possible.
The idea is to bleed static and surface charges to ground before they can call their biggest bestest friend, lightning, to come over to visit.
Especially in dryer climates with wind, static charges build up to a point where they can whack the equipment, lightning or not.
The fiber link will isolate the charges and the most significant power zaps from lightning, but a near strike can still pulse any nearby equipment into containers of useless components.
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LAN--SWITCH--[fiber xceiver]===Fiber Link===[fiber xceiver]---AP:::::"Lightning Arrestor":::Antenna
If your switch has a fiber port, you can just get a single compatible fiber xceiver and take the fiber link directly to the switch.
The non-coax connection on the lightning arrestor shold go directly to a grounding system (buried rod, cold water pipe ...)on large guage copper wire (I believe 6ga copper is typical for a direct system)
It is critical that the connections be well-bonded, clean, and as direct as possible with no sharp bends.
If you are interested in reading up on lightning protection (a nice thing to know if you're installing stuff outdoors & on rooftops)), PolyPhaser (.com) has a very good book on the subject that explains the details of a good lightning protection system.
Post up any additional questions. This is one of those things that just has to be right or the whole system is at risk.
Good Luck
Scott

Lightning Arrestors for Aironet 1522

Hi,
In ordering guide, 1522 are designed to withstand power surges on the AC power cord up to 4 kV as per EN61000-4-5 Level 4 & lightning arrestors are not required.
What does it means? I've install the AP outdoor & using ant58g10ssa antenna. I'm afraid the AP will struck by lightning

From an electrical engineering perspective assume we have 3 points of entry to the 1522, power, data and antenna. Each of these can transmit a lightning surge to downstream devices ie a switch or an upstream device the ap.
Generally the antenna will be the most vulnerable point of the installation to lightning strikes. If there is no surge suppression between the antenna and the ap then the ap can be damaged, also it can potentially transmit that surge down the data cabling, assuming the power cabling is protected as you say it should protect in both directions on the power side, but not always.
This probably means it can manage surges into the ap from the power side from a strike to transmission equipment and the transient overvoltages that may be caused.
Worst cast scenario your antenna gets a direct hit, the ap fails, the voltage is transmitted down the data cabling and takes out the 6500 its directly connected to! Nobodies going to say you done a great job and were just unlucky and you wont be winning any popularity contests
Its a question of risk, with an inline arrestor on the antenna cable you are protecting your ap etc. If its on a building and not the highest point its unlikely to get a direct hit. If its on a lighting column and the antenna is the highest point its possible. How much lightning do you get?
Not sure thats any help!

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1524, how many Lightning Arrestors?

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