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DHS- L Gener al D esc riptio n
2-11
Chapter 2 - Description a nd Installation
Figure 2-5
displays the MISB board.
Figure 2-5: MISB Layout
All connections to the MISB are made through a 24-pin champ amphenol-type connector
on the front of the MISB.
The MISB can accommodate an optional piggyback DTMF receiver for an additional eight
receivers and eight dial tone detectors for use in configurations containing many analog
telephone ports. It also has a proprietary CMOS device which handles the conference
clocking function of the system. The device contains eight identical circuits, each capable
of conferencing up to four parties; it operates on an internal 8.192 MHz clock and outputs
three frequencies used by the system: 2.048, 4.096, and 8.192 MHz.
The MISB has a red LED indicator that flashes to indicate that the card is functional.
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