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How to
reset the MAP to defaults? |
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On the MAP you
will see to white buttons above the LEDs, push and hold the one closest
to the LEDs for until the LEDs turn of and then back on. The MAP is
now reset back to defaults. |
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What
are the updates from 1.0 to 1.1? |
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- watchdog
and brownout enabled
- leds assignment
changed, starting from board edge: power on, wlan error, wlan
link & traffic, eth link & traffic.
- web firmware
upgrade (TFTP server is gone)
- spanning
tree protocol enabled
- Inter Access
Point protocol enabled
-
Upgrade from AP v1.0.0 may reset configuration settings
to factory defaults
- Factory
default settings are: no user/passwd for web auth., 192.168.1.90/24,
SSID: 802.11b AP, channel: 1, no WEP
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On the RWB-MAP wireless configuration, what are the differences
between "Basic Rates", "Supported Rates" and "Transmission Rate"?
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The "Basic Rates" are used only for management frames, broadcast
and multicast frames, and NOT for data frames. The highest rate
specified is the rate the AP uses to transmit such frames. The "Supported
Rates" allows an 802.11 network to specify the data rate it supports.
When a station attempts to join the network, it checks the data
rate used on the network. The "Transmission Rate" is used to control
the current transmit rate of a data packet. This setting basically
provides a means to set a Fixed or Auto rate value when the AP and
a station are enabled to communicate at the current rate. Starting
from the highest rate of the association, the fallback algorithm
is triggered by the transmit failure of a frame (i.e. all retries
have been sent without acknowledgement). The fallback rate will
last for an internally fixed time or until a number of successful
transmissions controls upgrade back to the highest rate. |
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Should
I use a lower RTS Threshold in my AP? |
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For WISP applications, an AP should NEVER ask clients for permission
to speak. Set your RTS threshold high on the AP, between 1500 and
2347. |
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Is Shared
Key Authentication better than Open Key in WEP? |
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Shared Key Authentication is not considered secure, because a hacker
who detects both the clear-text challenge and the same challenge
encrypted with a WEP key can decipher the WEP key. With Open Key
Authentication, even if a client can complete authentication and
associate with an AP, the use of WEP prevents the client from sending
data to and receiving data from the AP, unless the client has the
correct WEP key. |
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My AP
was working fine at first, but now locks-up and doesn't pass packets.
What might cause this? |
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Look for physical damage to the CPE from wind, rain, hail, lightning,
etc. Although the AP has built-in surge suppression, a direct or
nearby lightning hit is likely to cause damage in any electrical
circuit. Power-cycle the AP to reset the configuration if required.
If several power-cycles are needed within a week, then there may
be component damage. Also check to make sure that the antenna is
still pointing in the right direction after strong winds. Check
the CAT-5 cable to ensure that it is not stressed or damaged. All
8 wires need to be connected at each end, otherwise the PoE voltage
may be reduced on long cable runs. |
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My system tray shows an Ethernet connection and the green
LED on the AP/CPE indicates an Ethernet connection but the login
screen doesn't load when attempting to access the AP/CPE's web configuration.
What are the possible problems? |
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First, make sure the Proxy Server box is unchecked in your browser.
Secondly, a few Network Interface Cards (NICs) with auto-negotiate
features must be manually set to 10 Mbps half-duplex. The AP/CPE's
Ethernet is 10baseT and may not function properly without the NIC
set to a fixed connection. Radio card failure may also cause intermittent
problems of this type. |
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What
are the surge ratings of the CPE? |
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For the 2
power lines (PoE):
Peak Pulse Power (tp=8/20us) = 500 watts
Maximum Clamping Voltage (@Ip=1A) = 43 volts
Maximum Clamping Voltage (@8/20us) = 49 volts @ 12A
IEC 61000-4-2 (ESD): Air = 15 kV, Contact = 8 kV
IEC 61000-4-4 (EFT): 40A - 5/50ns
IEC 61000-4-5 (Surge): 24A, 8/20us - Level 2
(Line-Ground) & Level 3 (Line-Line)
For the data lines:
Peak Pulse Power (tp=8/20us) = 500 watts
Maximum Clamping Voltage (@Ip=1A) = 13.4 volts
Maximum Clamping Voltage (@8/20us) = 16.9 volts @ 34A
IEC 61000-4-2 (ESD): Air = 15 kV, Contact = 8 kV
IEC 61000-4-4 (EFT): 40A - 5/50ns
IEC 61000-4-5 (Surge): 12A, 8/20us - Level 1
(Line-Ground) & Level 2 (Line-Line)
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What
is the DTIM Interval? |
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The DTIM Interval determines the number of AP beacons between each
Delivery Traffic Indication Message (DTIM). This informs clients
of the next window for listening to broadcast and multicast messages.
When the AP has buffered broadcast or multicast messages for associated
clients, it sends the next DTIM with a DTIM Interval value. Clients
for that AP hear beacons and awaken to receive the broadcast and
multicast messages |
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What
is the maximum distance to an 802.11b Access Point or another CPE?
|
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Timing issues
in 802.11b transmissions limit the distance to 12 miles for full rate
transmissions but link up to 18 miles are possible with lower transmission
rates. |
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What
steps can I take to enhance security? |
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Enable 128 bit WEP with open key authentication. Deny unencrypted
data in WEP. Change the WEP keys at least weekly. Disallow administrative
access over wireless. Use secure protocols such as VPN connections
or SSH (secure shell) or SSL (secure sockets layer). |
