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123 and Symbols


         

UART

Universal Asychronous Receiver / Transmitter. The UART is the controller for the serial devices attached to a host device, such as a wireless module. "Universal" refers to the fact that the device's baud rate and other specifics are configurable through the controller in order to facilitate communication with other devices as is required. In asynchronous operation, devices use start and stop bits to signal to each other when to talk and when to listen, and never speak at the same time.

 


 

UART Buffer

In a Universal Asynchronous Receiver / Transmitter, a buffer is used to store a small volume of data before it is processed. This means that both devices have a slight delay in processing each other's data, but allows a safe interval to prevent lost data in case of interference or bad packets. In addition, it gives each device lead time to process an interrupt command from the other device. The UART buffer is somewhat analogous to a tape delay in live television broadcasts.

 


 

UDP

User Datagram Protocol. A communications protocol like TCP. Unlike TCP, UDP sends messages as a whole and not as packets. UDP does not ensure all of a message has been sent and has arrived in the correct order. Widely used for streaming audio or video.

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UNII Bands

In the United States and other countries that adhere to FCC policy, the 5 GHz band is divided into the following four sub-bands referred to as Unlicensed National Information Infrastructure (UNII) bands:

  • UNII-1: 36, 40, 44, 48
  • UNII-2: 52, 56, 60, 64
  • Intermediate: 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
  • UNII-3: 149, 154, 159, 165

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Unipole Antenna

A type of antenna very similar to the monopole. It consists of a single conducting rod mounted to a conductive surface. The unipole also has a series of wires attached to the top of the rod and the base. This design is meant to alleviate issues with AM broadcast antenna installations.

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Using Scan to Create a Profile

When you tap Scan on the Profile window, SCU displays a list of radios that are broadcasting their SSIDs.

Each row shows an AP's SSID its received signal strength indication (RSSI), and whether or not data encryption is in use (true or false). You can sort the list by tapping on the column headers. If the scan finds more than one AP with the same SSID, the list displays the AP with the same SSID, the list displays the AP with the strongest RSSI and the least security. Every five seconds, the Scan window updates the RSSI value for each of the APs in the list. TO scan for new APs and view an updated list, tap Refresh.

 Scan-List 

If you are authorized as an administrator in SCU, you can create a profile for any SSID in the list. To create and profile, double-tap the row for the SSID, or tap the row and then tap Configure.

If you tap Yes on the dialog box, then SCU creates a profile for that SSID, with the profile name being the same as the SSID (or the SSID with a suffix such as "_1" if a profile with the SSID as its name exists already). If the AP is using WEP, then SCU opens a dialog box in which you can specify WEP keys. If the AP is using EAP, then SCU opens a dialog box in which you can specify login credentials for the EAP type (which SCU assumes is LEAP).

 Scan-Create 

After you enter information on a dialog box, you return to the SCU Profile window, where you can view and edit profile settings. If you make any changes, then you must tap Commit to save the changes.

Note: SCU Admin use only. See the "Summit Software Administrator's Guide" for more information.

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