Cisco 1310 Bandwidth Throughput

[razvanpaic]

I have two Cisco 1310 devices that I configured for Point-to-Point conection. One is configured as a route-bridge and the other as a non-root-bridge. I calibrated the radio signal using the "led calibration method" in install mode. The ap's are configured for best throughput.

My problems are:

1. I tested the bandwidth with the two bridges positioned at 10m distance facing each other. The result was 19 Mbs (about 2.4 MB/sec brut speed). From the device specification results that these ap's should operate at 54Mbs. Why this speed is not reached?

2. I anchored them to two pillars at 700m distance facing each other. Between them we have several trees (imposible to cut). I used the 30m coaxial cable provided by CISCO from the AP to the power injector. The actual bandwith reached was 5.5 MBs. Is this normal to?

Thank you...

[Aaron Harrison]

Your mileage may vary, as they say...

Remember that the 54mb doesn't translate into real throughput - you have the radio overhead to deal with, interference etc...

The trees will definately have a negative effect on the signal... I believe it's to do with the high water content..

See this link:

http://www.wirelessnetworkproducts.com/index.asp?PageAction=Custom&ID=21

Regards

Aaron

Please rate helpful posts...

[mcorliss]

Remember that the greater distance you move the bridges apart the less the bandwidth. Same as with an AP. Here's a great bridge calcuation tool provided by Cisco that I refer to often: http://www.cisco.com/application/vnd.ms-excel/en/us/guest/products/ps5861/c1225/cdccont_0900aecd800f9155.xls

Also, if you look at the specs on the 1310 you'll see the range for point-to-point application with the integrated antennas:

Table 6 at the is link: http://www.cisco.com/en/US/products/ps5861/products_data_sheet09186a00802252e1.html

[straman]

1. 54Mbps is the bitrate at which data is transferred, not the actual throughput that can be reached. There's losses due to overhead inherent to the 802.11 protocol that limit the throughput-bandwidth to a max of approx 22Mbps.

2. The trees will probably penetrate the so-called Fresnel-zone. The signal-energy is traveling in a rugby-shped area from antenna to antenna. Blocking this area (partly) will impact the bandwidth and so will the distance. I assume you meant 5.5Mbps.