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What is the normal PER (Packet Error Rate) for the DWL-1800B/DWL-1800R?
The error rate will be about 4%-6% (transmitted fragments vs. retry count). This is typical
when operating in a non-interference environment at maximum range for bi-directional traffic
loads. If the traffic load is more uni-directional, then the PER will be less.
What is the best value for the CW min parameter on the DWL-1800?
Setting the CW min parameter to 31 for heavy bi-directional traffic loads will minimize the
PER. Setting the CW min to 15 will improve performance for more uni-directional traffic loads.
CW min 7 should only be used for short-range point-to-point links, and 63 should be used for
large, long-range multi-point links.
Is the D-Link AirPremier DWL-1800 compatible with other D-Link wireless equipment from
other vendors?
Yes. However, for the outdoor bridges, interoperability can vary from vendor to vendor and in
some cases it may not operate if the manufacturer's implementation is not pure 802.11b. The
DWL-1800B/DWL-1800R can operate at 1, 2Mbps 5.5Mbps and 11Mbps with D-Link Air and
Air Plus wireless family products. D-Link Air Premier DWL-1800 units are fully WI-FI
compliant.
How many DWL-1800B or DWL-1800R units can be collocated on the same building or
tower?
You can collocate up to 3 DWL-1800B or DWL-1800R units on the same structure. Each
unit is assigned to one of the non-overlapping channels, 1, 6, or 11.
Can a Frequency Hopping network operate in the same area as the D-Link Air Premier
DWL-1800?
Yes, but in a collocated network both products will suffer some a decrease in performance. The
degree of performance loss depends on network utilization. For example, the higher the utilization
of the Frequency Hopping network, the higher the level of impact on the Direct Sequence (DWL-
1800) network, and vice versa. Typically, in light to moderately utilized networks, the performance
loss is not significant.
Can I use D-Link Air Premier DWL-1800 Bridges to feed a Frequency Hopping
distribution point?
Yes, bandwidth sharing between the Direct Sequence and Frequency Hopping products can
be minimized if the network is designed using cross-polarized directional antennas with as
much spatial separation as possible. Contact technical support for more information.
Performance
What is the throughput of the D-Link Air Premier DWL-1800?
The DWL-1800B/DWL-1800R bridge link typical performance is 4.2Mbps using TCP and
6.2Mbps using UDP. For long-range links, the performance drops by about 5%.
What if the D-Link Air Premier DWL-1800 link experiences interference?
If interference is affecting the DWL-1800 link, one of the other channels may be selected to
operate away from the frequency of the interference. Also, physically re-locating the antennas
may help.
What is the typical latency of a DWL-1800B/DWL-1800R?
A point-to-point link would realize about 3mS latency.
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