Telos ZEPHYR XSTREAM RM ISDN DIGITAL AUDIO TRANSCEIVER

Technical Details

General 

• Full duplex, high-fidelity codec using MPEG-2 AAC, MPEG-4 AAC-LD MPEG-2 Layer-3, MPEG-2 Layer-2, AACPlus, and G.722; fully compliant with international standards.

Frequency Response 

• 20 - 20kHz @ 48kHz fs (+0/-1dB, swept sine tone procedure)
• AAC all modes except Stereo 64: 20-19,800Hz at 48kHz fs., 20-15,000Hz at 32kHz fs.
• AAC Stereo 64: 20-10,000Hz at 48kHz fs., 20-7,000Hz at 32kHz fs
• AACPlus mono (for use reception from the Xport): 20-15,000 Hz 48kHz fs
• Layer 3 all modes: 20-16,000Hz at 48kHz fs., 20-15,000Hz at 32kHz fs
• Layer 2 mono, dual mono: 20-7.8kHz/9.8kHz
• Layer 2 mono 20-8.6 kHz at 24 kHz fs.
• Layer 2 joint stereo: 20-20,000Hz at 48kHz fs. 20-15 kHz at 32kHz fs
• G.722: 20-7,500Hz.

THD+N

• Audio loopback, 48kHz fs, analog I/O, input at 1kHz +20dBu: 0.004%

Dynamic Range 

• A Weighting, AAC, Layer-3 or 2 end-to-end: 101dB typical

Send Input

• Active balanced with RF protection.

Zephyr Xstream:

• LINE: Settable to -11 or +4dBu (or -15 to 0 dBu) nominal level
• Clip point: 18 dB above chosen nominal level.
• Impedance: > 10K Ohms (x2)
• Connector: XLR female/quarter-inch TRS combo connector.

Zephyr Xstream MX and MXP:

• LINE: -11 or +4dBu nominal level (switchable).
• MIC: Accepts -65 to -24 dBu in 2 ranges (switchable). Mic impedance </= 1000 Ohms
• Clip point: 15 dB above chosen nominal level.
• Impedance: Line > 10K Ohms (x2)
• Connector: XLR female/quarter-inch TRS combo connector.

Limiter

Zephyr Xstream MXP

• Internal DSP-based AGC/limiter with Omnia® audio processing. Includes presets for music & voice, selectable per channel.

Zephyr Xstream

• Analog soft-clipper prevents A/D converter overload without loss of dynamic range

Line Bit Rates (ISDN)

• 56 or 64kbps per channel, front panel selectable

Bit Rates (V.35/X.21)

• 56, 64, 112 (imuxed), 128 (imuxed), 96, 128, 256, 384 kbps front panel selectable

Receive Output

• Active differential.
• Level: Front panel selectable for -10 or +4dBu, nominal.
• Impedance: < 33 Ohms (x2)
• XLR male

AES/EBU Digital I/O (rackmount version only)

• Sample rates supported: 32, 44.1 and 48kHz
• Rate conversion: Input and output independently selectable. Can be bypassed.
• Input clock: From external source or Telco clock.
• Output clock: From transmission sample rate, external source, or AES/EBU input.

Inverse Multiplex/Demultiplex

Internal channel splitting/combining of two network channels for stereo modes.

• AAC: Telos Zephyr™ protocol.
• AAC-LD: Telos Zephyr™ protocol.
• Layer-3: FHG/Telos Zephyr™ (Buchta) protocol.
• Layer-2: CCS CDQ™ protocol compatible.

Optional V.35/X.21 Direct Digital Interface

• Two ports, both V.35/X.21. Automatically selected when the appropriate cable is connected.

ISDN Interface

• Compatible with National ISDN, AT&T 5ESS custom, Northern Telecom DMS-100 custom, Siemens EWSD, INS 64(Japan) and EURO-ISDN (ETS-300). Compatibility and approval pending in some countries; contact Telos for current status.

LAN Interface 

• 100Base-T Ethernet port using RJ-45 connector. Full Duplex Supports TCP/IP (HTML, Telnet and FTP).

ISDN Voice Telephone Mode

• Two channels using G.711 standard, μ-Law or A-Law. 300–3,400Hz. DTMF signaling provided (CCITT standard).
• Remote Control and Ancillary Data
• RS-232 9-pin D-Sub female (DCE): Asynchronous; 8 data, no parity, 1/2 stop, 2400-57,600 bps.
• 100Base-T Ethernet port using RJ-45-style connector using Telnet or web browser (HTML).