FHSS and OFDM APs co-existing

Hello,

A customer of ours with a warehouse currently has legacy 802.11 Symbol
APs using FHSS modulation. The clients are hand-held terminals used
to scan (optically) products picked off the shelves.

We are upgrading their current WLAN with two Cisco Aironet 1231 APs.
(802.11g) These will be setup on channels 1 & 6. The new clients
will also be 802.11g hand-held terminals. New SSID etc..

We'll be running the old APs and new in the same warehouse while we
test it's all working OK.

Would you expect the FHSS and OFDM modulations on these APs to
interfere enough to cause major problems? ie: users getting
dis-associated?
I can see there will be occasional interference caused when FHSS hops
in to the same frequency that the Cisco APs are transmitting on, and
the Cisco is sending a frame - resulting in a collision &
retransmission.
I anticipate the load on each WLAN to be very low.

Many thanks!

Emlynfluff wrote:
> Hello,
>
> A customer of ours with a warehouse currently has legacy 802.11 Symbol
> APs using FHSS modulation. The clients are hand-held terminals used
> to scan (optically) products picked off the shelves.
>
> We are upgrading their current WLAN with two Cisco Aironet 1231 APs.
> (802.11g) These will be setup on channels 1 & 6. The new clients
> will also be 802.11g hand-held terminals. New SSID etc..
>
> We'll be running the old APs and new in the same warehouse while we
> test it's all working OK.
>
> Would you expect the FHSS and OFDM modulations on these APs to
> interfere enough to cause major problems? ie: users getting
> dis-associated?
> I can see there will be occasional interference caused when FHSS hops
> in to the same frequency that the Cisco APs are transmitting on, and
> the Cisco is sending a frame - resulting in a collision &
> retransmission.
> I anticipate the load on each WLAN to be very low.
>
> Many thanks!
>


We successfully use Proxim Rangelan2 XR (500mw) FHSS gear alongside
Industrial Wifi (200mw) DSSS gear and have not experienced any
association or throughput problems, on either network segment.

Thanks for the info.