Technical Manual Issue 2.1 4000 Digital Series II
Page 74 STA0381
4.3 PDE4631 - 16 Channel Audio Input / Output CODEC Card
The PDE4631 CODEC Card is a 16-channel analogue-to-digital and digital-to-analogue converter.
Either the PDE4622 CODEC RCU or the PDE4628 Serial Communications RCU can be used in
conjunction with this card.
Each input to the card incorporates voice detection (VOX) with a threshold which can be adjusted in
CMAPSi.
The PDE4631 board is illustrated below:
Figure 69 - PDE4631 16 Channel CODEC Card
The following table details the function of the PDE4631 card LEDs:
4.3.1 Card Location
These cards may be located in any slot from 3 to 20 in the 4920 matrix, or any slot from 2 to 7 in the
4420 matrix.
Table 2: PDE4631 LEDs
Callout LED Colour Name Notes
1 Green +5 Volts On if +5 Volts present.
2 Green -5 Volts On if -5 Volts present.
3 Green Configured On if the card is recognised by the system as
valid for this position