JBM electronic C-130 - Manual (Page 13)

Page -13-
Copyright
©2007 JBM Electronics, Inc.
Note: Depending on the provisioning of your card, particularly in corporate
applications in which the JBM Gateway is providing cellular backup connectivity
to wired circuits, your card may be restricted from Internet access. If this is the
case, you may want to instead test to insure that you are able to access your
corporate network. If you have any question as to your configuration please
check with your network administration.
If you were able to successfully access you’re the Internet, or your corporate network,
then congratulations, your JBM Gateway is up and running and you have successfully
completed the Quick Start. You may skip the troubleshooting section that follows.
If you were unable to access the Internet, or your corporate network, the section that
follows will help you to determine the cause of your difficulties.
Cellular Connectivity Troubleshooting
If you are reading this section, you have followed all of our instructions so far and your
JBM Gateway is not communicating. This section is intended to give you some
additional things to check in order to isolate the cause of your difficulties.
Cellular Reception
Before we get into specifics regarding how to identify and address specific problems that
can be encountered, it is important that we spend a moment talking about cellular signal
reception, and appropriate expectations.
All of the major cellular carriers expend significant sums insuring that we have excellent
signal coverage within their coverage areas. However, they have no control over the
environments in which we attempt to place or use our cellular devices.
The principles behind cellular data reception are similar to cellular phone reception.
Therefore, our environment has the potential to significantly impact our ability to receive
a good quality cellular signal.
You should be aware that it is possible to stand in the parking lot of a building and have
perfect reception, but walk just 10 feet inside a concrete and steel building and have
absolutely no reception at all.
The important thing to understand here is that in many, many instances it is not the
cellular network that causes us reception problems, but the environment in which we
place our cellular devices.
For this reason, JBM Electronics strongly recommends the use of external antennas
when implementing cellular data. It can make the difference between an implementation
that works and one that doesn’t.