Appendix D: Troubleshooting Guide; Debug Interface - AT&T metrocell 9962 Installation Manual

In the absence of such a custom design, the following
guidelines are provided.
1. Install the first MetroCell and activate it. If possible,
allow some flexibility to be able to move it to adjust the
coverage area in step 5.
2. Map out the effective coverage area of the first MetroCell
by walking around while looking at the number of "bars"
of signal strength on a handset. Identify the edge of the
area covered by the 1st MetroCell where signal strength
is between 1 and 2 bars. This is as far away from the first
MetroCell as a user could be and still be properly served
by that MetroCell.
3. Find a site for the 2nd MetroCell that is as far away from
the edge of the coverage area identified in step 2 as that
edge is away from the first MetroCell. Map the coverage
area as in step 2.
4. Install and activate the 2nd MetroCell. If possible, allow
some flexibility to move it to adjust the coverage area in
the next step.
5. Place test calls from points throughout the combined
coverage area, especially in the overlap area, where
interference between the two may adversely affect call
quality. Test for the ability to place calls, the ability to
maintain calls without dropping, and voice quality. Adjust
the locations of the MetroCells if necessary to achieve
the best performance.
AT&T MetroCell 9962 installation guide • April 2016

Appendix D: Troubleshooting guide

If you are not able to make a voice call or use data applica-
tions, follow the troubleshooting steps in this appendix.
If you have multiple small cells at the same site and are ex-
periencing poor voice quality, slow data speeds, or dropped
calls, the cause may be interference between the cells. It
may be necessary to increase the separation between cells
or otherwise shield the cells from each other. If you are ex-
periencing poor voice quality, check that the recommended
Internet access bandwidth is provided and available.
Preliminary steps
• Power down the MetroCell and wait 10 minutes.
• Power up the MetroCell and wait at least 15 minutes.
• Ensure that an appropriate mobile device is available.
If the handset is connected to the public or "macro"
network, it may be necessary to power it off and on or put
it in and out of airplane mode in order to have it connect to
the MetroCell.
• If the MetroCell has been configured to operate in
"Closed" mode, either change to Open mode or ensure
that any device being used to make test calls is on the
Approved User List (see the AT&T MetroCell 9962 User
Guide available at att.com/metrocell).
• Check that an Internet router is connected and that
Internet access is working properly.
• Ensure that administrative access to the router and
MetroCell is available.
• Verify that the Local Transport Requirements in Appendix
A are met. This may require adjustment of certain router
parameters.

Debug interface

Four LED indicator lights are visible on the front face of the
MetroCell. LEDs provide status indication for:
• Power • WCDMA (also known as 3G)
• LTE • GPS
These LEDs can be used to help diagnose problems –
see the troubleshooting steps below.
The various LEDs can take one or more of these states:
• Off • Flashing red
• Flashing green • Solid red
• Solid green • Toggling between red and green
8