I've read this in the WISP forums.

The FCC limits power to like 36db for PtMP links. That is an AP to several clients. The CLIENT to the AP is considered a PtP link and thus the client can be up to 40db. (I belive 40 is the correct db value.)

Again, AP can be 36db and the client can be 40db. (See previous assumption.)

Just in case some people are wondering.

Tron Of Borg

Was looking for info like this.....

isp-wireless@isp-wireless.com

Tron Of Borg


Here is the message:


---------------------------------------------------
I called and asked about that.

The client is NOT ptmp so he falls under the 3 for 1 rule.

You can stay in the eirp rules for ptp (client side of a ptmp is also ptp) at 60 watts (24db tx and 24db antenna).

<DELETED>

----- Original Message -----
From: <DELETED>
To: <isp-wireless@isp-wireless.com>
Sent: Saturday, March 30, 2002 4:23 PM
Subject: Cisco says Multipoint Clients can't exceed 36dB EIRP ?


>
> Now that FCC blather is cooled down, let me fire it back up..
>
> Was on the Cisco site looking for some information on their dual
> antennas (Can you hook up two different directional antennas to
> increase coverage?
> many people ask me, I think not, but some have said it works,
> has anyone actually tried and verified it??)
>
> Anyway, I ran across this Q/A, which if you believe Cisco's
> interpretation, then basically ALL ISPs are in violation of FCC rules,
> as a client-side 24dBi antenna w/15dbm output (lucent) radio
> exceeds 4 watts (36dbm) EIRP, not to mention those 100mw cards, or 250mw
> amps..
>
> I have asked the FCC about this a year ago, and was told clients are
> considered point-to-point, but they would not give it to me in
> writing.. Cisco seems to believe differently.
>
> http://www.cisco.com/warp/public/102/wlan/radio-faq.html#Q6
>
>
> Q. The FCC limits the maximum system power to 4 watts Effective
> Isotropically Radiated Power (EIRP) for non point-to-point systems.
> However, a properly tested and certified system is allowed to exceed
> the 4W EIRP for a point-to-point system. I have two parabolic dishes
> aimed at an Omni. Can I exceed the 4W EIRP limit if I consider each
> leg point-to-point?
>
> A. No. The FCC defines the system using directional gain antennas
> as only part of the complete system. You cannot
> exceed the 4W EIRP for any of the legs of this system since the
> whole system is a point to multipoint. This topic is defined
> in FCC docket 96-8, which covers the spread spectrum transmitter.
>



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