Users Manual Part 1

2x2 UBR user manual using GUI Revision: A0-07

CONFIDENTIAL

11.5 TDMA Configuration

Time-division multiple access (TDMA) is a channel access method for shared-medium networks. It

allows several users to share the same frequency channel by dividing the signal into different time slots.

The users transmit in rapid succession, one after the other, each using its own time slot. This allows

multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only a

part of its channel capacity.

Slot width is a feature in TDMA communication to provide equal opportunity of communication for

devices in TDMA. Each TDMA slot width consists of data transfer time and guard time. During the data

transfer time, data will be exchanged between the master and slave. Guard time is to ensure that data is

received by the receiver.

The master device allocates the slot width for the slave devices. This slot width information broadcasted

to all the slaves by beacons. After receiving beacons, the scheduler in the slave devices schedules TX and

RX times in the slot for the slave device. The slot width is configured to 8ms.

The TDMA configuration screen has following options:

1. Link Settings

2. Link Security Settings

3. Advanced Settings

4. Redundant Link Switching

11.5.1 Link Settings

The UBR radio supports 2x2 MIMO (Multiple-Input and Multiple-Output) and TDMA up to 256QAM.

MIMO refers to a practical technique for sending and receiving more than one data signal simultaneously

over the same radio channel by exploiting multipath propagation.

The UBR can be configured for P2P and P2MP communication links. The term point-to-point

communications (P2P) means a wireless data link between two fixed points. Point-to-multipoint

communication (P2MP) is accomplished via a distinct type of one-to-many connection, providing

multiple paths from a single location to multiple locations.

Link established between participating devices depends on the selected link type (P2P or P2MP) and

mode type (master or slave). The link configuration for the master can be configured from the GUI and

the slave device receives the link configuration from the respective master device. The various scenarios

are discussed separately in below sections.