ACRS 2.
FCC Regulatory Information This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Introduction ACRS 2.0 is the second generation Adaptrum cognitive radio system covering spectrum bands from 400 MHz to 1 GHz. Although capable to operate in other spectrum bands below 1 GHz, Adaptrum ACRS 2.0 is specifically designed to operate in the UHF TV Band (470 MHz – 698 MHz), as TV Band Devices compliant to the rules specified in CFR 47 Part 15 Subpart H. To be rules-compliant, ACRS 2.0 systems must operate as Fixed TV Band Devices and must be professionally installed. ACRS 2.
ACRS 2.0 radio has a fully enclosed weather-proof aluminum construction as shown in the following pictures. There are status 4 LEDs on the front and an SMA antenna port and an Ethernet port on the back. The unit is powered through Ethernet and there is no separate power connector. The last picture below shows an example pole-mount installation. Both the base and the client stations use the same radio unit.
ACRS 2.0 system must be professionally installed. Please refer to “ACRS 2.0 Professional Installer Manual” for detailed discussion on hardware installation. After installation, the base station and client station system configurations are illustrated in the following figures. Internet Antenna Feed Cable ACRS 2.0 Base Radio Ethernet Ethernet Switch Ethernet Base Control PC Base station installation diagram.
Client Control PC Antenna Feed Cable ACRS 2.0 Client Radio Ethernet Ethernet Switch Ethernet Broadband Router Ethernet/WiFi Client Devices Client station installation diagram. A whitespace communication link is established between the base station and client station allowing the client side networking devices to connect to the Internet. Multiple client units may connect to the same base station.
GUI Control Interface Base station GUI control panel "Link" pane in the “User” mode. The GUI control panel is shown in the above figure. The GUI panel has a main frame body and 6 panes: Log, Link, System Information, Diagnostics, Database and Installation. Among them, the “Link” and “Database” panes are most useful in terms of monitoring system performance and interacting with TVWS database. The figure above and figure below show the base station “Link” and “Database” panes respectively.
Base station GUI control panel “Database” pane. The base and client control panels are only slightly different. The following two figures show the client station “Link” and “Database” panes. Again, the client software will operate in the “User” mode and the information entries for device registration and channel list request are disabled and loaded directly from system registry.
Client station GUI control "Link" pane. Client station GUI control "Database" pane.
. Base Station Operation The base station operation is discussed in the following. 1) When the software launches on the base control PC, it will prompt connection IP address at 169.254.0.9 which is a fixed IP address used to communicate with Adaptrum ACRS 2.0 radio. Click “Connect” button to continue. 2) The software will automatically contact the database to retrieve the available channels which are shown after “BASE MAC…”.
4) After the channel selection, the link pane is shown as following. Click “Start Service” to start transmission on the base station. 5) After the client station successfully connects to the base station, the “Link” pane will show uplink and downlink data rates, modulation schemes, BERs, PERs and signal power estimations as shown in the following figure. Note once connected to the base station, the client station will also send periodical channel list request to the database through the base station.
Client Station Operation The client station operation is discussed in the following. 1) When the software first launches on the client station control PC in the “User” mode, the client will automatically scan all channels specified in the scan channel list.
2) Once the client successfully connects to the base station, it will enter the normal operation mode. During normal operation, the client will send channel list request periodically to the base station. When the current base station operating channel is no long in the client channel list, the base station will terminate the connection session with the client. Subsequently, the client will enter scanning mode again and rescan all the channels in the scan channel set.
