54mbps (IEEE 802.11g) with 11mbps & 54mbps clients

Hi group.

Someone told me that if I introduce a 54Mbps AP with
11Mbps & 54Mbps PCMCIA clients accessing it simultaneously, then every client will be dropped to the
speed of 11Mbps. That means the 54Mbps clients will also access the AP at 11Mbps.
Unless all clients are 54Mbps, then they will access the AP @ 54Mbps.
If even one of the client is 11Mbps. then all will drop to that speed.

Is this true?

I'm looking at purchasing this AP: http://www.dlink.com/products/resour...?pid=10&rid=27


It says it is a 'IEEE 802.11g-Draft'.

To e-mail, remove the obvious

1. D-Link equipment is definitely less than the best. Stick with Linksys.

2. Most 802.11b equipment was designed before 802.11g was around, and
hence chokes on incompatible 802.11g signals. There are some notable
exceptions, but I recommend not going there. This usually forces mixed
installations into going with only 802.11b. Hence, in answer to your
question, YES, you would probably be stuck at 11MBPS or less.

3. 802.11b/g equipment doesn't usually work in residential areas,
because there is always a neighbor with a 2.4GHz cordless phone. I
recommend going with 802.11a unless you KNOW that neighboring cordless
phones won't be a problem. I prefer mixed 802.11a/802.11g with automatic
band switching, so when you get hit with aircraft radar on 802.11a, you
just switch to 802.11g until you get hit with a neighbor's cordless
phone, whereupon you switch back, all automatically.

I explain all this in greater detail in my book. Email me off-forum for
more information if you are interested.

Steve Richfield, N7VCG
======================
AcCeSsDeNiEd wrote:

> Hi group.
>
> Someone told me that if I introduce a 54Mbps AP with
> 11Mbps & 54Mbps PCMCIA clients accessing it simultaneously, then every client will be dropped to the
> speed of 11Mbps. That means the 54Mbps clients will also access the AP at 11Mbps.
> Unless all clients are 54Mbps, then they will access the AP @ 54Mbps.
> If even one of the client is 11Mbps. then all will drop to that speed.
>
> Is this true?
>
> I'm looking at purchasing this AP: http://www.dlink.com/products/resour...?pid=10&rid=27
>
>
> It says it is a 'IEEE 802.11g-Draft'.
>
> To e-mail, remove the obvious

> 3. 802.11b/g equipment doesn't usually work in residential areas,
> because there is always a neighbor with a 2.4GHz cordless phone. I

I have:

1 Logitech wireless desktop (don't know which frequency)
1 Senheiser cordless headphone (2.4 Ghz)
1 microwave ( 2.45 Ghz)
1 Accesspoint (11 mbit)
1 54mbit wireless networkcard .


all work together without problem.
But network at 11 mbit, not 54 :-)



--
Treat your password like your toothbrush.
Don't let anybody else use it,
and get a new one every six months

"Steve" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> 3. 802.11b/g equipment doesn't usually work in residential areas,
> because there is always a neighbor with a 2.4GHz cordless phone.

DECT, the modern technology of cordless phones in many countries, is around
1.9GHz. Older analogue phones usually use a frequency much lower than that,
e.g. around 40MHz in the UK. I therefore disagree with the above statement.

Nicholas,

The problem isn't with YOUR phone, it would be with your neighbor's
phone. When I got my network, I tossed my 2.4GHz phone and replaced it
with a $20 900MHz phone. Now, if I could just convince my neighbors to
do the same, then 802.11b/g would be a LOT more useful.

If you live in an apartment building, then it is pretty hard to tell
just who has an offending phone.

Steve Richfield
========================
Nicholas F Hodder wrote:

> "Steve" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>
>>3. 802.11b/g equipment doesn't usually work in residential areas,
>>because there is always a neighbor with a 2.4GHz cordless phone.
>
>
> DECT, the modern technology of cordless phones in many countries, is around
> 1.9GHz. Older analogue phones usually use a frequency much lower than that,
> e.g. around 40MHz in the UK. I therefore disagree with the above statement.
>
>

Verstrooid,

My experience was that a 2.4GHz cordless phone has to be at least 2-3
times as far away as the node that I was trying to work. If you want to
work 100 ft to the other end of your yard, then your neighbor's phone
must be 200-300 feet away.

In your case, I presume that your two systems are close together, while
your cordless phone is at the other end of your home?

Of course, if you have discovered some great secret for living with 2.4
GHz cordless phones, then PLEASE let us in on it.

BTW, the secret to living with microwave ovens is to use Channel 11.

Steve Richfield
========================
Verstrooid Profke wrote:

>
>> 3. 802.11b/g equipment doesn't usually work in residential areas,
>> because there is always a neighbor with a 2.4GHz cordless phone. I
>
>
> I have:
>
> 1 Logitech wireless desktop (don't know which frequency)
> 1 Senheiser cordless headphone (2.4 Ghz)
> 1 microwave ( 2.45 Ghz)
> 1 Accesspoint (11 mbit)
> 1 54mbit wireless networkcard .
>
>
> all work together without problem.
> But network at 11 mbit, not 54 :-)
>
>
>

Steve wrote:
>
> Verstrooid,
>
> My experience was that a 2.4GHz cordless phone has to be at least 2-3
> times as far away as the node that I was trying to work. If you want to
> work 100 ft to the other end of your yard, then your neighbor's phone
> must be 200-300 feet away.

cordless HEADphones. it is a sennheiser T30
distance between the basestation of the headphones and my PC-case (with
wirless card) is about 1 meter. Case is below, on the ground, base
station is on the table.


> BTW, the secret to living with microwave ovens is to use Channel 11.

Indeed, i use channel #11


(not chanel #4 ) ;-)


>
> Steve Richfield
> ========================
> Verstrooid Profke wrote:
>
>>
>>> 3. 802.11b/g equipment doesn't usually work in residential areas,
>>> because there is always a neighbor with a 2.4GHz cordless phone. I
>>
>>
>>
>> I have:
>>
>> 1 Logitech wireless desktop (don't know which frequency)
>> 1 Senheiser cordless headphone (2.4 Ghz)
>> 1 microwave ( 2.45 Ghz)
>> 1 Accesspoint (11 mbit)
>> 1 54mbit wireless networkcard .
>>
>>
>> all work together without problem.
>> But network at 11 mbit, not 54 :-)
>>
>>
>>
>
>



--
Treat your password like your toothbrush.
Don't let anybody else use it,
and get a new one every six months

It doesn't matter whether it's you or your neighbour who has a cordless
phone. My point is that in many countries, 2.4GHz phones do not exist, so
the problem would not arise. As I pointed out, DECT (the most popular
global standard for cordless phones) uses 1.9GHz, not 2.4GHz. That's why I
disagree with your statement "802.11b/g equipment doesn't usually work in
residential areas, because there is always a neighbor with a 2.4GHz cordless
phone".

For example, I live in central London where plenty of my neighbours have
cordless phones. As cordless phones in the UK (and many other countries) do
not use 2.4GHz, they do not interfere with my 802.11b/g network.

"Steve" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Nicholas,
>
> The problem isn't with YOUR phone, it would be with your neighbor's
> phone. When I got my network, I tossed my 2.4GHz phone and replaced it
> with a $20 900MHz phone. Now, if I could just convince my neighbors to
> do the same, then 802.11b/g would be a LOT more useful.
>
> If you live in an apartment building, then it is pretty hard to tell
> just who has an offending phone.
>
> Steve Richfield
> ========================
> Nicholas F Hodder wrote:
>
> > "Steve" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> >
> >>3. 802.11b/g equipment doesn't usually work in residential areas,
> >>because there is always a neighbor with a 2.4GHz cordless phone.
> >
> >
> > DECT, the modern technology of cordless phones in many countries, is
around
> > 1.9GHz. Older analogue phones usually use a frequency much lower than
that,
> > e.g. around 40MHz in the UK. I therefore disagree with the above
statement.
> >
> >
>

"Steve" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> 1. D-Link equipment is definitely less than the best. Stick with Linksys.

I like my D-Link AG650 card, and I get 54g at about 20mbs with my Linksys
AP. I have the linksys locked to 54g only. Be careful about recommending
Linksys in all cases. For example there are no drivers that I am aware of
for Linux or BSD users for 54g Linksys/Broadcom products. Hopefully this
will change but all indications from Linksys and Broadcom are that their
products are M$ windows only. If I am not mistaken, Cisco now owns Linksys.
This has some long term implications.

> 3. 802.11b/g equipment doesn't usually work in residential areas,
> because there is always a neighbor with a 2.4GHz cordless phone. I
> recommend going with 802.11a unless you KNOW that neighboring cordless
> phones won't be a problem. I prefer mixed 802.11a/802.11g with automatic
> band switching, so when you get hit with aircraft radar on 802.11a, you
> just switch to 802.11g until you get hit with a neighbor's cordless
> phone, whereupon you switch back, all automatically.

True about the neighbour's phone, or your own. But by moving from channel 6
to either 1 or 11 I now don't have problems. I live in an townhouse complex
and would get the degraded signals on channel 6. But it works for me as
does at least two other APs I can see.

For the extra $5, I recommend people get 802.11a/b/g equipment and using g
as g has the range but at a higher throughput. And if their portable hits a
b only zone, it will connect on b, but in a g zone they get the benefits.
If they hit a g only zone with a b only card they will only see the beacon.
g cards also usually support week IV filtering (not all, most) and have 128
bit or higher WEP. Alot of older b cards only support 40 bit wep which can
be brute forced cracked.

In a nutshell, 54g/b equipment works just fine in residential areas.

OK, I see what is happening here.

Good cordless phones use spread spectrum, that tends to trash most/all
of the 2.4 GHZ band. However, there are lots of cheap short-range
cordless phones, along with other short-range devices like cordless
headphones that use a single frequency. Spread spectrum WiFi equipment
works pretty well in the presence on non-spread interference, and if you
DO run into a problem, you can always change channels.

Steve Richfield, N7VCG
==========================
(verstrooid) profke wrote:
> Steve wrote:
>
>>
>> Verstrooid,
>>
>> My experience was that a 2.4GHz cordless phone has to be at least 2-3
>> times as far away as the node that I was trying to work. If you want
>> to work 100 ft to the other end of your yard, then your neighbor's
>> phone must be 200-300 feet away.
>
>
> cordless HEADphones. it is a sennheiser T30
> distance between the basestation of the headphones and my PC-case (with
> wirless card) is about 1 meter. Case is below, on the ground, base
> station is on the table.
>
>
>> BTW, the secret to living with microwave ovens is to use Channel 11.
>
>
> Indeed, i use channel #11
>
>
> (not chanel #4 ) ;-)
>
>
>>
>> Steve Richfield
>> ========================
>> Verstrooid Profke wrote:
>>
>>>
>>>> 3. 802.11b/g equipment doesn't usually work in residential areas,
>>>> because there is always a neighbor with a 2.4GHz cordless phone. I
>>>
>>>
>>>
>>>
>>> I have:
>>>
>>> 1 Logitech wireless desktop (don't know which frequency)
>>> 1 Senheiser cordless headphone (2.4 Ghz)
>>> 1 microwave ( 2.45 Ghz)
>>> 1 Accesspoint (11 mbit)
>>> 1 54mbit wireless networkcard .
>>>
>>>
>>> all work together without problem.
>>> But network at 11 mbit, not 54 :-)
>>>
>>>
>>>
>>
>>
>
>
>