U.M. Android v5.1.1
Table Of Contents
- Revision History
- Table of Contents
- About This Guide
- Chapter 1 Getting Started
- Chapter 2 Using the Tablet
- Introduction
- Google Mobile Services
- Home Screen
- Applications
- Suspend Mode
- Rebooting the ET5X
- Chapter 3 Applications
- Chapter 4 Wireless
- Chapter 5 Data Capture
- Chapter 6 Accessories
- Chapter 7 Maintenance and Troubleshooting
- Appendix A Specifications
- Index
4 - 16 ET5X User Guide
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Power Save - The device can be configured to work in different power save modes:
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Active - Keeps the WLAN radio always in active mode (i.e. power save mode disabled).
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Power save using WMM-PS - This is the default power save mode. Device uses WMM-PS power save
method if the AP is configured to use this. If the AP is not supporting WMM-PS, the device will use PS-Poll
power save method.
•
Power save using PS-Poll - In this method, the device will use PS-Poll frames to retrieve buffered frames
from the AP.
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Null Data Power Save - In Null Data Power Save (NDP), the device will stay awake for 100 ms after the
last frame is sent or received. The device will send a Null Data packet with power management bit cleared
to retrieve buffered frames from the AP.
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802.11k - Using 802.11k, the device can discover neighbor APs and adds support for different types of radio
resource measurements. Default: enabled.
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Band Preference - The device can be configured to prefer one band over another. By default, device prefers
5 GHz frequency band over 2.4 GHz.
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Subnet Roaming - When the device roams between different sub networks, if it detects that it is roaming to
a different subnet, the device will request a fresh IP address. Default: disabled.
Zebra Mobility Extensions
Zebra Mobility Extensions make use 802.11 specifications and Zebra proprietary extensions to achieve the highest
level of performance, efficiency and reliability. The ET5X adds support for the following Zebra Mobility Extensions.
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Coverage Hole Detection - The ET5X includes enhancements to the IEEE 802.11k standard. These
improvements will report gaps in signal coverage to the Zebra wireless LAN infrastructure. Network
administrators can detect and mitigate coverage gaps present in the network for greater reliability. Default:
enabled.
•
Aggregated Fast Transition - Aggregated FT improves on IEEE 802.11r, Over-the-DS fast roaming. In
conjunction with Zebra wireless LAN infrastructure, the ET5X will achieve more reliable and consistent fast
roaming. Default: enabled.
•
Scan Assist - The ET5X monitors neighbor access points and retrieves roaming related information from the
Zebra wireless LAN infrastructure without doing scans. Using this Scan Assist feature, the ET5X improves
roaming. Default: enabled.
Bluetooth
Bluetooth-equipped devices can communicate without wires, using frequency-hopping spread spectrum (FHSS)
radio frequency (RF) to transmit and receive data in the 2.4 GHz Industry Scientific and Medical (ISM) band
(802.15.1). Bluetooth wireless technology is specifically designed for short-range (10 meters (32.8 feet))
communication and low power consumption.
Devices with Bluetooth capabilities can exchange information (e.g., files, appointments, and tasks) with other
Bluetooth enabled devices such as printers, access points, and other mobile devices.
Adaptive Frequency Hopping
Adaptive Frequency Hopping (AFH) is a method of avoiding fixed frequency interferers, and can be used with
Bluetooth voice. All devices in the piconet (Bluetooth network) must be AFH-capable in order for AFH to work.