Comrex Matrix rack for ISDN codec  etc

The Comrex Matrix in its basic form is a digital audio transmission device for analog telephone lines. The Matrix allows wideband, broadcast quality audio over normal “toll quality” telephone circuits. Here’s a short list of the Matrix’s POTS Codec features:

♦ Full duplex FM quality (15 kHz) audio bandwidth at connect rates of 24 kb/s and above.

♦ Full duplex audio scales from 12.7 kHz to 4.7 kHz at connect rates of 21.6 kb/s to 9.6 kb/s.

♦ Separate “Voice Mode” allows 7 kHz audio with a 300 BAUD ancillary data channel and extra forward error correction.

♦ Easy to use dialing and configuring interface. ♦ Available in portable or rackmount chassis.

♦ Automatically connects at highest possible rate supported by telephone connection.

♦ Monitors line quality and renegotiates should line degrade.

♦ Ability to “store and forward” 9 3/4 minutes of audio. A full fidelity feed may be recorded and sent over a low bitrate circuit to be played later in non-real time.

♦ Two tally closures (one on connection, one triggered by the user).

♦ Ability to work with a Comrex BlueBox, HotLine or Vector. ♦ Ability to store 19 telephone numbers and last number dialed in nonvolatile memory.

♦ Short coding delay (100 mS) allows seamless two-way conversation.

♦ Accessory slot allows insertion of optional modules, adapting the Matrix for use on other circuits such as ISDN and GSM.

♦ Optional battery runs Matrix for up to 7 hours.