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Software Manual 18

Cellular Configuration

NOTE: Depending on the provisioning of your module/SIM, particularly in corporate applications in which the unit is pro-

viding cellular backup connectivity to wired circuits, your module/SIM may be restricted from Internet access. If this is the

case, you may want to test to ensure that you are able to access your corporate network. If you have any questions about

your configuration, please check with your network administrator.

If you were able to successfully access the Internet, or your corporate network, your Red Lion unit is up and running. You

have successfully completed the Quick Start and you may skip the troubleshooting section.

2.1.5 Cellular Connectivity Troubleshooting

NOTE: 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.

If you are reading this section, you have followed all previous instructions and your Red Lion router is not communicating,

this section will provide additional information to isolate the cause of difficulties.

2.1.5.1 Cellular Reception

Before we get into specifics regarding how to identify and address specific problems that can be encountered, it is impor-

tant 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 cover-

age 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 is that in many, many instances it is not the cellular network that causes reception

problems, but the environment in which we place our cellular devices.

Important Note about Cellular Antennas

For this reason, Red Lion strongly recommends the use of external antennas when implementing cellular data. It is often

the key to a successful implementation. Consult your Red Lion representative if you have questions about the appropriate

use of external antennas.

Diversity/MIMO

This port is used for RX diversity on 3G connections and MIMO for LTE connections. Receive Diversity or MIMO is a trans-

mission technique that consists of using two separate antennas to achieve the most robust cellular signal possible. Diver-

sity will help achieve fast, reliable data throughput in applications that require a high amount of bandwidth. This antenna

is not mandatory for 3G, however it will improve throughput in low signal and fringe areas. This antenna is required for

compliance with LTE MIMO operation.

To get the best performance, this second antenna should be placed at a minimum of 5/8 of a wave length away from the

other antenna. Therefore, the minimum spacing for antennas in the 800 MHz frequency is 5/8 * 13.5” = 8.5”. The diversity

antenna can be spaced further away than this, ideally in increments of 13.5”, 22”, 35”, etc. For a 1900 MHz only network,

the optimal distance would be 5/8 * 6.2” = 4”. Orienting the antennas differently from one another may also improve per-

formance, particularly when the antennas are close together.

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RAM 6000 Información técnica Pagina 18