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Comrex > Nexus
NEXUS ISDN Digital Audio Codec
Nexus Portable

 
Features & Benefits
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56/64 kb/s¿¡¼­ Bidirectional 7.5kHz audio
112/128 kb/s¿¡¼­ Bidirectional 15kHz audio
Ancillary data capability
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ISDN¶Ç´Â DATA LineÀÇ ¿î¿ëÀÌ °¡´ÉÇÏ´Ù.
Line ¶Ç´Â MIC ÀÔ·ÂÀÌ °¡´ÉÇϸç Level Á¶Á¤ÀÌ °¡´ÉÇÏ´Ù.
Turbo G.722 ¹æ½ÄÀ¸·Î Àü¼Û Áö¿¬ÀÌ ¾ø´Ù.
LCD Menu drive ¹æ½ÄÀ¸·Î Á¶ÀÛÀÌ °£´ÜÇϸç, ´ÜÃà ´ÙÀ̾ó ±â´ÉÀÌ ÀÖ´Ù.
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Applications
The Nexus provides a cost saving alternative to satellite feeds or dedicated circuits.
  It is ideal for applications requiring high quality (7.5 or 15 kHz) mono audio.
  This codec is the best choice for remotes involving live programming such as talk, news, and sports,
  where real-time cueback is essential.
  Also, since G.722 is an international telephony standard, the Nexus provides compatibility with a
  large established base of users worldwide including the DXR.1 and DXP.1 made by Comrex.
About the Algorithm
  The G.722 algorithm is an international ITU standard which uses Adaptive Pulse Code Modulation (ADPCM) to achieve a 4:1 data reduction, allowing more audio information (or wider bandwidth) to be sent along a voice grade digital channel.
  The Nexus incorporates 64X oversampled Sigma Delta A to D and D to A converters. The algorithm is run on a single ADSP-2181 DSP and uses a statistical synchronization technique which is continually updated by the decoder. When used in ancillary data mode, H.221 synchronization is used. Audio is sampled and reconstructed at 16 kHz (7.5 kHz mode) or 32 kHz (15 kHz mode) with 16 bit quantization. The Nexus automatically adapts to 56, 64, 112, or 128 kb/s.

Specifications
< All specifications are subject to change >

Matrix Portable
Connections

Audio In : 3-pin XLR female
Tape in : 1/8" 2 conductor mini jack
Audio out : 3-pin XLR male
Tape out : 1/4" stereo phone jack
Suitable for direct headphone connection.
Data in/out : EIA-530 on DB25 connector
Adaptable to V.35 or X.21 via external cable.
4800 baud ancillary data : DB9 connector
ISDN line : RJ11 connector
Levels

Audio Input :
Mic Input : -85 to -40 dBu @20K ohms
Line Input : -10 to +10 dBu @100K ohms
Audio Output :
Impedance : 100 Ohms
Max output : +12 dBu
Ancillary Data :
RS232 electrical signals
Data in/out : EIA530 (RS422 electrical signals)
Audio Frequency Response :

At 112/128 kb/s : 20Hz - 15kHz
At 56/64 kb/s : 20Hz - 7.5 kHz
IMUX Protocol : Bonding
Switch Protocols supported

For North American "U" interface :
National ISDN 1, AT&T 5ESS (Point to Point or Multipoint), Northern Telecom DMS100
Power : External Supply : 120/240 VAC 60/50 Hz
Size : Portable : 6.25" W x 9.5" D x 2" H / Rack : 19"W x 8"D x 3.5"H
Weight : 3 lbs