On Wed, 15 Nov 2006 22:38:23 +0100, hlexa@hotmail.com (Axel
Hammerschmidt) wrote in <1hov6zm.e6hqn5odi4owN%hlexa@hotmail.com>:

>John Navas <spamfilter0@navasgroup.com> wrote:

>> What I mean is that a simple repeater cuts the available wireless
>> bandwidth for all wireless devices (including the router) in half.
>
>Because the Wi-Fi router has to wait for the repeater while it repeats
>the packet.

Correct -- only one device can be transmitting at any one time.

>> Per my earlier post, what actually happens is:
>>
>> Transmit packet 1
>> Repeat packet 1
>> Transmit packet 2
>> Repeat packet 2
>> ...
>> Instead of:
>>
>> Transmit packet 1
>> Transmit packet 2
>> Transmit packet 3
>> Transmit packet 4
>> ...
>> When the repeater is transmitting a repeat packet, the wireless network
>> is unavailable to any other wireless transmitter, including the wireless
>> router. That's why I recommended a remote wireless Ethernet bridge
>> cabled to a wireless access point on a different non-overlapping
>> channel, which avoids have the available wireless bandwidth cut in half.
>
>OK. So the router runs at 27 Mbps with the repeater - is that constant
>or only when the repeater is active?

The router, just like the repeater and all other wireless devices, still
runs at a maximum of 54 Mbps, but only 1/2 as often (because of
bandwidth taken for repeating).

>Anyway! The router shares the available bandwidth with the station that
>connects directly to the router and the repeater. The station then gets
>13.5 Mbps and not 27 Mbps.

1. All devices (router, local station, repeater, remote station) are
sharing the same channel.

2. Only one device can be transmitting at a time.

3. The repeater doubles the amount of wireless traffic (for all devices
it can "hear"), thereby cutting effective network speed in half.

>So two stations, one connected directly to the router and the other
>using the repeater, each achieve 13.5 Mbps.

No, a repeater turns a maximum 54 Mbps network into a 27 Mbps network
for all devices on that network. (Actual speeds will typically be much
less.)

Consider a network with access point AP, local wireless device LW,
repeater WR, and remote device RW. When LW is talking to AP, WR is
still repeating:
Packet 1 from LW to AP
Repeat of packet 1 by WR
Packet 2 from AP to LW
Repeat of packet 2 by WR

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>