Chapter 1
Introduction
This chapter provides an overview of features and capabilities.
The DCB Analog Voice Adapter-Ethernet (AVA-E) is used in pairs to provide a high quality compressed
voice channel plus an asynchronous serial data channel through a single composite serial or ethernet data
link. The serial network may be synchronous or asynchronous, using leased line modems, radio links, or
digital data service. Asynchronous terminal devices may be terminals, printers, computer ports or other
asynchronous devices. The voice channel may be connected to standard analog telephone sets, PBXs, key
systems, radios, etc. The ethernet network link may be any IP connection, including the Internet, satellite,
wireless, and broadband connections.
The asynchronous data port is configurable for speeds up to 57,600 bps. Serial network speeds may be as
high as 230.4 Kbps asynchronous or 256 Kbps synchronous. Depending upon the voice quality desired, the
voice channel can be configured for bit rates between 2250 and 9600 bps or ADPCM (32K), PCM (64K).
The AVA-E is configured via a USB Setup port using a PC with terminal emulation software or using a
web browser connection. Configuration settings are maintained in non-volatile memory.
Additional features of the AVA-E include:
User configurable voice rate and jitter delay.
Available with an optional built-in 12 VDC, 24 VDC or 48 VDC power supply.
Industrial temperature rating of –40C to +85C
Ethernet IP connectivity over any Internet connection.
Rack mount options.
FXS/FXO, 4-wire E&M, or Push-to-Talk interfaces
Applications
The AVA-E provides quality voice links at minimum bandwidth. While low-bit-rate voice is adequate for
many uses, some audio applications require PCM or ADPCM encoding. AVA-E is the rare product that
provides both low-bit-rate as well as high quality ADPCM/PCM options.
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Utility substations
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Office to home analog extensions
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High quality Audio over data links for remote voice logging and transmitter control
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Two-way radio audio over slow speed data links
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Gas and oil production, pipelines
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Remote radio dispatch operations
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Phone extensions over wireless and satellite links
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"Hoot 'n Holler" remote public address/ intercom systems using data connections
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