Oki Data CONFIDENTIAL
42930511TH Rev. 2 220 /
Cannot communicate only when going through certain access points/Cannot
communicate occasionally/Communication is disrupted occasionally/Communication
speed is extremely slow
Phenomenon:
Despite the same wireless LAN setting, wireless communication becomes erratic only when going
through certain access point(s). Wireless communication is fine when going through other access
points. (C9600 can be discovered by AdminManager when going through other access points.)
Possible cause What to do
LAN cable connection at access point is
inappropriate.
Network setting of the access point is
inappropriate.
MAC Address Filtering function of the
access point is running.
Access point has been set to “High Speed
Mode (Frame bursting)”.
Access point malfunctions
Access point problems/characteristics
unique to particular product
The maximum connectable number has
been exceeded due to many wireless
terminals (Note PC, etc) that are simultane-
ously connected.
Check if the LAN cable at the access point is connected correctly.
Check the type of cable (straight/cross), connectors, etc.
Pay special attention to the connection if the LAN port at the access point
has distinctions such as ‘WAN’ side, ‘LAN’ side, etc.
Replace the LAN cable connected to the access point and the hub of the
connection destination, by a different LAN cable and a different hub.
Check if the router function is set properly to match the network that is
connected if the access point has the router function.
When the MAC Address Filtering function of the access point is set to
ENABLE, add the C9600 to the connection permitted list.
* Register the MAC address of the C9600’s wireless LAN card to the
access point. Pay extra attention not to register the MAC address of the
wired I/F by mistake.
* MAC address of the wireless LAN card will be described in the Network
Summary. For how to print Network Summary, see Printing Information /
Network Summary (p.65).
If the access point is set to High Speed Mode such as ‘Frame bursting’, it
may cause a communication problem with C9600.
Set the High Speed Mode (Frame bursting) of the access point to OFF.
Perform wireless communication via the access point used from the
wireless computer and check if normal communication takes place. If the
phenomenon occurs in a device other than C9600, it is more likely that
the problem lies in the access point itself.
Look for a similar phenomenon in the technical support information of the
vendor’s home page, etc., and implement the solution offered there.
Upgrade the F/W of the access point to the latest version.
Replace the access point by a different model.
Change the C9600 setting to connect to a different access point.
Turn off the wireless terminals (Note PC, etc) not in use.
* Even if it is in standby state, the wireless terminal is connected to the
access point.
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