Analog Voice Adapter -- FXS, FXO, E&M, or Raw Audio Over serial or Ethernet Links

• Analog voice over serial or ethernet
• Voice over Ethernet using the -E ethernet model
• Serial network port may be synchronous or asynchronous
• Multi-drop transport auto-VOX feature supports audio broadcast to five remotes (50 remotes with the PR-6606)
• User serial port plus voice
• Simple, low cost analog phone device
• FXS/FXO, 4-wire E&M or Push-to-Talk interface
• Very high quality low bit rate voice
• ADPCM or PCM for highest quality voice rates
• One to one or one to many configuration
• Industrial temperature -40 to +70 C
• DC power options: 12, 24, 48 VDC
• USB serial port, RS232, or web browser for configuration
• Easy to setup and maintain

DESCRIPTION

The AVA-01 is a one voice port adapter available with FXS, FXO, 4-wire E&M or a push-to-talk interface (for a radio or speaker-microphone). The AVA-01 is designed for simplicity and ease of setup. The unit can be setup using a serial terminal interface, via an RS-232, USB connection, or web browser.

The AVA-01 provides exceptional compressed voice quality at speeds ranging from 2400 to 9600 bps. The compressed voice is based on the same chip set used for Project 25 (P25) radio interoperability. This is a voice chip set that has a very long market life, which translates to a long market life for the AVA. AVA voice choices also includes 56K PCM or ADPCM. The choice of PCM make the AVA-01 suitable for applications that require tone control, such as links to radio transmitters or broadcast audio.

The AVA-01 may be ordered with FXS/ FXO/4-wire E&M/PTT or only push-to-talk (PTT) audio interfaces. PTT is included with the FXS/FXO/E&M units as well. The electrical interface is specified at the time the unit is ordered. The PTT audio interface may be supplied with a microphone and speaker for PTT only orders, and as an add-on item for FXS/FXO/E&M units. The speaker circuit includes a .25 watt amplifier.

The AVA-01 can also operate over Ethernet networks using IP. For Ethernet operation, order the "-E" Ethernet option.

All versions include an additional asynchronous RS-232 user port. Via this asynchronous user port, AVA supports both SCADA polling and compressed voice on multidrop networks of 9600 bps and faster. AVA resolves the contention between the polling and the voice. Voice with polling on multidrop circuits uses the push-to-talk mode or auto-VOX for multi-drop modems. Voice is broadcast from the host to all remote AVAs, and from one remote at a time to the host. This mode allows control room to substation conversations without the need for cell phones or substation voice phone lines. The RS-232 interface may be used to manage remote equipment.

A feature unique to the AVA-E is the abillity to replace multi-drop analog modem lines. Even if the existing terminal equipment has built-in modems with no RS-232 interface for control signals, the AVA's auto-VOX circuitry allows multi-drop modem circuits to be built over IP connections.

Applications for the AVA-01

• Utility substations
• Office to home analog extensions
• Audio over data links for remote voice logging
• Two-way radio audio over slow speed data links or IP
• Gas and oil production, pipelines
• Replacement of analog point-to-point or multi-drop private circuits with IP based networks
• Phone extensions over wireless links
• "Hoot 'n Holler" remote public address intercom systems using data connections