Zephyr is specifically designed for use with one ISDN circuit and other low bit-rate transmission paths. Each Zephyr unit serves as both a transmitter and a receiver. It is the premier product in a complete range of ISDN audio products that includes the  Zephyr Express™ which has an ISDN transceiver and audio mixer in a compact, road-rugged chassis.

• Full duplex stereo operation with up to 20kHz audio can be transmitted on one ISDN line or two Switched 56 lines using Layer 3 coding.

• Broadcast quality, mono 15kHz or 20kHz audio is possible on a single ISDN “B” channel or other 56/64kbps channel.

• Telos’ advanced digital signal processing (DSP) experience harnesses the power of Layer 3 efficiently and economically. Our sophisticated hardware platform allows future software upgrades to be quickly installed.

• Zephyr is compatible with the widest range of codecs (digital audio coder/decoders) from other manufacturers.

With Zephyr, you are in touch with the world.

• The front panel has a clean, uncluttered design for simple operation with full metering, call-duration timer, headphone jack, and straightforward controls.

• The ISDN terminal adapter is built-in. Everything required for the ISDN connection is included, and connection to the telephone network is via a single modular cable. Models are available without the terminal adapter for lower cost when used for non-ISDN applications.

• An available V.35/X.21 port allows Zephyr to be connected to one or two Switched 56 lines, satellite links, and other data paths. You select V.35/X.21 merely by connecting the appropriate cable.

• The ISDN Telephone feature (G.711) allows Zephyr to dial any standard analog telephone line for low-grade voice communications.

• The split channel mode allows individual mono Layer 3 signals to be transmitted to separate sites. This feature

is ideal for bilingual programming as the audio on each channel is completely separate.

• Auto-dial sets include the codec section settings (such as bit rates and transmit and receive coding choices) and the numbers of the remote location you wish to dial. Fifty complete auto-dial sets can be rapidly accessed.

• Bi-directional, RS-232 serial data at 9600bps for communications and control are transmitted simultaneously with the audio. The communications mode is used to transmit data between the two connected locations, while the control mode is used to operate either a local Zephyr using a computer or a remote unit via modem.

• AES/EBU digital input/output interface module provides maximum flexibility for connection with digital studio equipment. Sample rate conversion is available on both input and output paths. Sample rates of 32, 44.1 and 48kHz are supported. The module accept external clock or may generate clock when required.

• Four end-to-end parallel “contact-closures” can be used to control recorders and other devices. Any of the inputs can be used as a “panic dialer” to automatically connect to frequently called or emergency numbers.

• A fifth output serves as an in-use indicator when an ISDN line is connected and as an alarm when the ISDN connection is terminated. This closure can also be used at either the time of connection or the time of disconnection to start or stop an audio recorder or other device.

• Zephyr’s careful analog design helps to ensure superior sound.

• The selectable input audio limiter prevents overload of the analog-to-digital converter when the program signal peaks instantaneously. The limiter is very fast and tight and does not assert itself during times of normal audio levels.

• A comprehensive self-diagnostic routine is performed when the unit is turned on. Problems in the unit, or with

the ISDN line, have associated error messages that can be used for troubleshooting.

• Zephyr is the ideal solution for remote broadcasts, ad hoc networks, voiceovers, commercial distribution, backup to microwave and satellite links, and many other applications.