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9 Installing the EUM
122
APCD-LM043-4.0
A: There are two conditions that might prevent or compromise Internet access by the end-user
through the EUM, even when the network is operating properly and the radio signal strength is
adequate:
Improper PC configuration
If the PC IP address set is incorrect, then communications between the PC and the
EUM will not be possible. If the DHCP function does not provide a valid IP address to
the PC, then the PC IP address will have to be entered manually. More advanced
troubleshooting may be required to find out why DHCP is not working properly in this
case. As well, if the Ethernet card in the PC is not properly configured, you will not be
able to communicate through the EUM.
A quick, simple test for confirming that there is a radio link between the EUM and the
WISP network, which does not rely on having the correct configuration in the end-
user’s PC, is to ping the CCU (or some other destination in the WISP network) through
the EUM console port, using HyperTerminal and the EUM command-line interface. If
this test is successful, then the problem is either the PC connection to the EUM, or the
PC configuration.
Interference
If there is a strong radio interferer in the vicinity of the end-user’s premises or, more
specifically, to the EUM installation, this may impact the ability of the EUM to
communicate over the radio link, either preventing communications, or at least,
causing a higher than expected error rate.
If the interference originates from inside the end-user’s premises, then it can be
controlled by relocating either the EUM antenna or the source of the interference.
If the interference originates from outside the end-user’s premises, the problem may
be addressed by relocating the indoor antenna or, if an outdoor antenna is being
used, by carefully siting the antenna to provide adequate isolation from the interferer.
Without the use of special test equipment, such as a spectrum analyzer, interference
problems may be difficult to positively diagnose and resolve.
Содержание LMS4000
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