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ZEPHYR
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USER’S GUIDE
42 CHAPTER 6 - T ECHNICAL & INSTALLATION IFNORMATION
7 Specifications & Warranty
All specifications subject to change without notice
GENERAL
• Full Duplex field terminal supports analog
(POTS) telephone lines and ISDN circuits
(optional).
• Full duplex high fidelity
operation using aacPlus
coding.
• Fallback to digital
adaptive hybrid mode if line is unable to
support reliable data connections.
• MPEG AAC-LD coding over optional ISDN
interface.
• Auxiliary connector allows use over cellular
handset.
FREQUENCY RESPONSE
• Mixer:
• Line input to Mix output: ± 0.5 dB 20 Hz to
20 kHz
• Mic input to Mix output: + 0.1/-0.75 dB 20 Hz
to 20 kHz
• Codec (Line in to Direct Rcv Out):
• End to end connection at 24 kbps: +0/- 3
dB @ 20 Hz - 15 kHz
• End to end connection (ISDN) at 56 or 64
Kbps: +0/- 3 dB @ 20 Hz – 15 kHz
THD + NOISE
• Mixer - From line input to Mix output (adjusted
fully to send) loop mode: 0.0043% @ 1 kHz,
22Hz – 22 kHz
• Codec - End to end connection at 24 kbps (Line
in to Direct Rcv Out): 0.04% @ 1 kHz 22Hz –
22 kHz
DELAY (round trip)
• aacPlus (POTS) <700 msec
• AAC-LD (ISDN) <90 msec
MICROPHONE INPUT (balanced XLR-3
female)
• Clip point
• Gain High: -37 dBu
• Gain Low: -27 dBu
• Available Gain:
• Gain High: 50 dB
• Gain Low: 60 dB
• Impedance: ≥ 3.8 K Ω
• CMRR @ 1 kHz: 75 dB
• Phantom power: 12 volt @ 10 mA
LINE INPUT (balanced; ¼” TRS)
• Level: +4 dBu (+20 clip)
• Impedance: ≥ 19 K Ω
• CMMR @ 1 kHz ≥ 62 dB
AUXILARY JACK (unbalanced input and output
on ¼” jack: Tip output, Ring input)
• Input:
• Level: Unity gain to Mix Out, 20 dBu clip
point
• Impedance: ≥ 9 K Ω
• Output:
• Level: -26 dBu (nom.)
• Impedance: ≤ 12 Ω
RECEIVE DIRECT OUT (Balanced XLR-3 male
jack)
• Level: +4 dBu (20 dBu clip)
• Digital nominal operating level: -18dBfs
• Impedance: ≤ 50 Ω
• Noise floor ( no decoder lock): -75.5 dBu