Click to See Complete Forum and Search --> : CRC errors, retransmits, and bears - oh my!
antinym
08-31-2003, 03:20 PM
I have a cisco AP 350 and a workgroup bridge 350 with directional patch antennas about 150' from each other. They are the only devices in this WLAN. aligning the antennas I get signal strength about 40% and quality around 80%. I run VoIP so there's alot of packet transmissions. Unfortunatly I'm getting around 30-70 CRC errors and retransmits a minute. (retransmits are obviously very bad for VoIP). I've changed channels - no help. I'm not sure what else I can do except move to .11a or another technology. Help me!!!
Signal Str seems very low for directional antennas, whats the gain on them ? How long and what type of cable is the patch ?
antinym
09-04-2003, 11:39 PM
the AP has just the four foot cable that comes with the antenna, the bridge has a 20' low loss cable with some cisco part number on it. the gains were at 100mw, but i've played with them as low as 30mw on both sides. - no help. The installation is only about 8' above ground. there's a new traffic signal about 30' to the right of line of sight.
100mw is output power of the device not the gain on the antenna. By default the bridge comes with a 2.2db omni antenna.
1. Try swapping the antenna's
2. Just removing the bridge and hooking the 20' antenna cable directly to a pci wireless nic, just for a test. (I think this will most likely work best)
antinym
09-05-2003, 09:16 AM
Sorry, The gain on the antenna's are 13.5 db
antinym
09-05-2003, 03:50 PM
sorry, 8.5dbi hemispherical patch antenna's.
If you have two 8.5db antenna at 150' with line of sight(even omni antenna) you should be getting 100/100 most of the time.
Is a transformer or some other high power electrical equipent near by, I know you mentioned the traffic light anything else ?
1. Try swapping the antenna's
2. Remove the bridge and hooking the 20' antenna cable directly to a pci wireless nic, just for a test. (I think this will most likely work best).