A line detection card is included in these digital audio matrices:
- PC2001 'Digital audio matrix (4/4/4)'
- PC2002 'Digital audio matrix (0/4/4)'
- PC2003 'Digital audio matrix (4/4/16)'
- PC1001 'Voice alarm panel Compact 400'
- PC1002 'Voice alarm panel Compact 1000'
The following digital audio matrices do not support a line detection card:
- PC2005 'Digital audio matrix no supervision (4/4/0)'
- PC2006 'Digital audio matrix no supervision (0/4/0)'