Wifi Access Point Configuration

Anyone know AIR-AP1042N-A-K9 and AIR-AP1231G-A-K9 (Cisco APs) can support maximum how many concurrent connections?

What is the default password for cisco APs

Any recommended new model (stand alone) that can support more than 40 concurrent connection

Is it possible to configure same SSID in two different stand alone APs close by. will its get conflict?
sumod_jacobSenior IT ManagerAsked:
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Fred MarshallPrincipalCommented:
From the data sheet:
Maximum Number of
2.4 GHz
¿ 802.11b/g:
20 MHz: 3 channels

¿ 802.11n:
¿ 20 MHz: 3 channes

5 GHz
¿ 802.11a:
20 MHz: 21 channels

¿ 802.11n:
20 MHz: 21channels

¿ 40 MHz: 9 channels

So, the number of channels is equivalent to the number of INDEPENDENT users/clients.
If you can stand lower bandwidth, then you might allow more channels but that likely means more access points.  A typical access point will support one channel and some perhaps two.
I say INDEPENDENT because the users have to share the bandwidth.  So this is really the crux of the question you've asked.   They don't have to be independent but then the bandwidth is going to be shared... this is the typical single-AP situation.  So, can you support 40 in that mode?  It depends on their bandwidth demands .. among other things no doubt like interference, etc.

Login: Cisco / Cisco

You can use the same SSID if the units are completely separated for sure.
If they aren't completed isolated one from the other then at least you would want to use different channels.
Experience in doing this may well vary according to the behavior of the client machines.
This is a very useful approach so you won't want to reject it out of hand.
Craig BeckCommented:
In theory the APs can support up-to 2048 connections based on the number of MAC addresses it can store.  However, realistically the radio would only allow ~255 clients to connect.

In the real world though those numbers would be impossible.

Usually the rule of thumb is (for Cisco's APs) no more than around 25-30 clients per AP at most for general usage (web-browsing, etc).

Channels don't have anything to do with how many clients the AP can support.
Craig BeckCommented:
...you can configure multiple APs with the same SSID, but as fmarshall explained you have limited non-overlapping channels, so planning which AP has which channel is important if you want to deploy APs which don't interfere with each-other.
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Fred MarshallPrincipalCommented:
Some access points allow multiple channels so, in effect, are multiple access points in one box.  That's what I was referring to about channels.   So, if one access point will support 25 clients or so, then two (using different channels) will support 25 more and perhaps out of the same box.  You still have to be concerned about spectral utilization and overlap.

As you may have figured out, all this entails a number of parameters.
Craig BeckCommented:
Sorry for sounding pedantic, but that's not exactly true... using multiple channels aids to increase bandwidth and range, not concurrent connections.

If you're referring to frequency bands, then that's different and in that respect you are correct (even if the terminology was incorrect).  Channels are discreet sections of the frequency band so no matter how many channels you have, that has no positive or negative effect on the number of clients the AP could support.  If you have two radios in an AP though which can be used simultaneously (one 2.4GHz and one 5GHz) you 'could' (in theory) have 25 clients on the 2.4GHz radio and 25 clients on the 5GHz radio.

However, in my example I mentioned that around 25-30 clients is the most that Cisco recommend per AP (not per radio).  That is ~15 clients on the 2.4GHz radio and ~12 clients on the 5GHz radio.
Fred MarshallPrincipalCommented:
I'm not at all sure about the distinction in terminology.  I was using "channel" and "frequency band" as meaning the same thing.  That they may overlap is one of the issues under discussion.

But, OK, I suppose being pedantic we can say that a "numbered channel" has but a "center frequency" and it's useful bandwidth is determined by whether other such channels are in use at the same time.  In this case the "frequency band" is determined by the center frequency (the nominal channel center freq) and the usable bandwidth.  And, one could "use up" multiple numbered channels by defining the bandwidth that one is going to be using.  Can we agree on this?

So, you are correct that multiple channels may or may not be usable without consideration for bandwidth and separation being taken into consideration.  But, once that's been done and is satisfactory then one could have 12-15 clients on one and 12-15 clients on another.  That takes separate access points or, at least, radios within.  Can we agree on this?

I surely don't want to confuse or be misleading and would hope to respond to the question as best possible for the asker.  So, I stand ready to be corrected.
Well, 802.11b/g actually used 22MHz-wide channels...  but 802.11n's channels are only 20MHz-wide... so if you restrict the 2.4GHz band to 802.11n, you can make four non-overlapping channels in Europe - 1 (2.402-2.422 GHz), 5 (2.422-2.442 GHz), 9 (2.442-2.462 GHz) and 13 (2.462-2.482 GHz).

Or two non-overlapping 40MHz-wide channels (1+5 and 9+13).

But it will be a long time before doing that won't be interfering with legacy 11b/11g devices.

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