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How to
reset the MCPE to defaults? |
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On the MCPE 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 MCPE
is now reset back to defaults. |
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Firmware
Change Log? |
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Firmware 1.2.5
- Fixed a problem
with TCP deadlocking when receiving data from a remote host but
being unable to make progress re-transmitting a lost segment
- Cleaned up
web server’s error recovery on aborted requests
- Added BSSID
and RSSI to syslog mark messages
- Improved
RSSI and noise level dBm readings
- Fixed wrong
MAC address displayed by Locator
- Now show
the device the bridge is associated with on the Scan List page
- Changed the
bandwidth control: now account for protocol headers (Ethernet,
IP, TCP and UDP) in the bandwidth calculation. Also, ICMP and
IGMP packets are not bandwidth limited anymore
Firmware 1.2.2
- Fixed typos
in help pages
- Fixed web
server port problem
- Fixed a
bunch of small items
Firmware 1.2.1
- Fixed self-programming
LED’s
- Fixed typo
in WEP help page
- Fixed scan
list signal level
Firmware 1.2.0
- Added syslog
client
- Added ability
to deny access to the web UI from Ethernet or WLAN
- TFTP server
disabled by default
- Added support
for Locator Utility Tool
- Changed
default settings for SSID to “none"
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Can
I use two CPE's in a Point-to-Point (PtP) application? |
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Yes you can place each CPE in Ad-Hoc mode and set each to the same
SSID and Channel. Another option for PtP is to flash one of the
RWB-MCPE with the RWB-MAP firmware and enter CPE's MAC address in
the AP's MAC filter to ensure only PtP is used. The second CPE would
be used in infrastructure mode, associating with the AP/CPE. |
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How
does Fragmentation Threshold work in the CPE? |
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Fragmentation
Threshold adjustment may be required to increase the reliability
of frame transmissions. This value determines the size at which
packets are fragmented. (sending the packet as several pieces rather
than one block) The RWB-MCPE has a default value of 2346, which
will work most of the time. Occasionally, when there is interference,
this value should be lowered to improve efficiency and reduce packet
loss. You can read more about this subject here: Fragmentation
Threshold |
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How
does RTS Threshold work in the CPE? |
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RTS/CTS adjustment may be required to minimize collisions among
hidden nodes. This value determines the packet size at which the
CPE issues the request to send (RTS) before sending a packet. The
default value of RWB-MCPE works most of the time, however a low
RTS setting may improve the throughput when many client devices
are associating with an AP or when the clients are far from each
other and can only detect the AP and not each other. This setting
should be adjusted before trying to change the fragmentation threshold.
For more information: RTS
Threshold and RTS
FAQ |
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If the
AP that I am associated with goes down, will my CPE associate with
a new AP? |
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If the Access Point SSID is saved to the CPE, it will only associate
with that specific SSID. If that SSID is not available or if the
AP signal is weaker than other nearby AP's, the CPE will NOT establish
a new association. However, if the SSID field is left blank in the
CPE configuration, it will associate with any AP that is broadcasting
it's SSID. |
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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 CPE
shows a 35% link quality on an long link. Should I set the CPE transmission
rate lower or leave it on Automatic? |
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If the link quality shown in either the Summary Screen or in the
Magnify screen is consistently better than 35%, we recommend leaving
the rate on "Automatic". If your link quality is between 20% and
35%, you should set the rate to 5.5. At less than 20% LQ, you should
set the rate to either "1 or 2" or 1 Mbits/s. |
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My CPE
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 CPE has built-in surge suppression, a direct or
nearby lightning hit is likely to cause damage in any electrical
circuit. Power-cycle the CPE 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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The web pages don't appear to load properly or the CPE does
not appear to be operating correctly. Could it be my web browser
that is causing the problem? |
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Yes. Make sure you are operating Microsoft Internet Explorer version
5.5 or higher or Netscape version 7.0 or higher. The CPE may operate
with other browsers but it has only been certified to work with
the versions of Internet Explorer and Netscape referenced above. |
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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
does the AP Density selection do? |
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The CPE firmware uses the Link Quality in conjunction with the AP
Density configuration to initiate a scan for an AP offering better
communications quality. If the AP Density is set to "High", this
causes the CPE to scan for an AP that will support 11 Mbps whenever
the CPE decides that the current associated AP can no longer support
this rate. This assumes that in a system with many AP's, one or
more AP's should be in range to support this rate. If the AP Density
is set to "Medium", this causes the CPE to scan whenever it decides
that the current AP can no longer support rates between 2 and 5.5
Mbps. If the AP Density is set to "Low", this causes the CPE to
scan whenever it decides that the current AP can no longer support
rates between 1 and 2 Mbps. |
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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). |
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When I associate with an Access Point, my signal and noise
level look very good but my transmission rate only shows 1 or 2
Mb/s, not 11 Mb/s as expected. Is this normal? |
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This is a normal occurrence. Once some data has been passed through
the CPE, try refreshing the screen. The transmission rate displayed
will usually jump up to 11 Mb/s as expected. If not, check to make
sure that the CPE's transmission rate is set to 11 Mbps or Auto.
Also check to make sure that the AP supports 11 Mbps. In addition,
the throughput will always be less than the raw transmission rate.
For a raw rate of 11 Mbps, the throughput is typically 4.5-5.5 Mbps.
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When I power up the CPE and launch my Web browser, why don't
any Access Points show up in the scan results? |
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The firmware running the radio needs approximately 10 seconds to
perform its internal scan before it can report its results to the
Web browser. Try waiting, and then refresh the page. Also, the Access
Points must have their SSID set to "visible" to show up in the scan
results. |
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When I "Click to Associate" with an Access Point on the
Status page, why doesn't the CPE appear to be associated? |
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Make sure you are operating Microsoft Internet Explorer version
5.5 or higher or Netscape version 7.0 or higher. There are known
problems of this type when not operating certified browsers with
the CPE. |
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Why
is there a difference in signal levels reported by the Summary and
Scan screens? |
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There may be as much as 6 dB difference between the signal levels
displayed in the System Summary and Wireless Scan screens. This
is normal and is due to slightly different algorithms used to obtain
these readings. The levels reported in the System Summary screen
are more accurate. These levels may change slightly after a screen
refresh. This is also normal and is due to signal fluctuations due
to wind motion and reflections. Obtain an average level by refreshing
the Summary screen several times. |
