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TidBITS 
TidBITS TidBITS Talk
802.11g-n mixed network question
![[swyant]](/webx/?30@@1)
swyant (apparently)
- 05:01am Jul 5, 2008 PSTvia emailHello Tidbits --
I've researched this, but am not quite clear on the answer. So I turn
to Tidbits for help.
I have a client with a very large property. Currently, the main house
has 5 Airport Extremes (802.11n) and the two outbuildings each have an
Airport Express (802.11g). They are all on the same network (SSID),
all wired via ethernet to the main Extreme and then to the modem, set
to different channels (per the instructions of Apple).
When all the computers in the house are upgraded to 802.11n, do I need
to remove/replace the Express 802.11g units to allow full 802.11n
speeds throughout the network, even though the 802.11g Expresses are
rarely used? In other words, does the "slowest unit determines the
speed" rule apply in the network described above, even if nothing is
ever (or rarely) using the Expresses, and if they connect to the
network only through Ethernet? Or should I just create two little
separate networks (SSIDs), one each for the Expresses?
Thanks for any help you all can render.
Scott Wyant
Neil Laubenthal
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Jul 5, 2008 1:25 pm
(#1 Total: 3)
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| Posts: 1 |
Re: 802.11g-n mixed network question
I'm pretty sure that the speed of a g/n network is determined by
clients alone and not the Airports themselves. If all the workstations
are upgraded to n then I'm pretty sure that you can leave the g's
installed at the outbuildings. Taking an n client out there will
connect through the Express at g speed which will put the entire
network at g speed temporarily.
If not . . . then you could create two networks; a g one and an n only
one.
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Alan Forkosh (apparently)
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Jul 7, 2008 3:10 am
(#2 Total: 3)
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| Posts: 82 |
Re: 802.11g-n mixed network question
When considering whether to have an 802.11n-only network, remember
that the iPhone only understands 802.11g and 802.11b. I have set up a
dual network at home with 802.11n using the 5Ghz and 802.11g at the
traditional 2.4 GHz. I am using earlier generation Airport Extreme
(the pointy dome) to service the 802.11g network while the square
Airport Extreme functions as the router for the whole system and
services the 802.11n network.
Actually, I do have a question about the possibilities at 5GHz. You
may choose to make a make a 802.11n 5GHz network 802,11a compatible.
My work Windows PC speaks 802.11a, b, and g, but not 802.11n. Does
making the 5GHz 802.11a network have any throughput implications when
no 802.11a device is attached? How does attaching the 802.11a device
affect it?
Alan Forkosh Oakland, CA
aforkosh  mac.com
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Alexander Hoffman (apparently)
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Jul 9, 2008 1:00 am
(#3 Total: 3)
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Re: 802.11g-n mixed network question
Unlike g and b 802.11, Apple's 802.11n routers (i.e. TimeCapsule,
Airport Express and Airport Extreme Basestations) had lots of extra
ways to run and n-network.
Of course, there is the compatibility with older networks
question. But with n-networks there is also the possibility of
switching to a different band (i.e. 5MHz, instead of the conventional
2.4MHz). There is also the option of doing dual-band 5MHz for even
faster throughput.
AppleInsider did a review of these options in the context of
looking at TimeCapsure/TimeMachine speeds.
If you want the fastest network, you need to set the it to the
n-only 5MHz and the wide/dual channels. This has less range/wall
penetrating power, but it is much faster than the the default setup,
or even any of the other possibilities.
(This is how my network is set up, with an old Express doing
802.11g for the TiVo, iPhone and visitors).
Of course, none of this matters for Internet access. g is likely
already as fast as your Internet connection. The extra speed only
matters for activity entirely within your own network.
=Alex Hoffman
Leadership, Policy &
Politics
Teachers College, Columbia
University
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TidBITS TidBITS TidBITS Talk 802.11g-n mixed network question
