5
List of Figures
Figure 1 5556 Component diagram.................................................................................8
Figure 2 5556 Card orientation.....................................................................................10
List of Tables
Table 1 Interrupt request lines: W1.............................................................................9
Table 2 Base port address: W1......................................................................................9
Table 3 Prefix, repeat, and escape commands..........................................................13
Table 4 Set 300/1200 BPS protocol .............................................................................13
Table 5 Dialing options................................................................................................13
Table 6 Echo commands ..............................................................................................14
Table 7 Hook control....................................................................................................14
Table 8 Volume control................................................................................................14
Table 9 Speaker on/off .................................................................................................14
Table 10 Enable/disable result codes ...........................................................................14
Table 11 Read/write to S registers...............................................................................15
Table 12 Result code and dialing options....................................................................15
Table 13 Long space disconnect...................................................................................15
Table 14 Carrier detect (DCD) options.........................................................................15
Table 15 Data terminal ready (DTR) options ..............................................................15
Table 16 Guard tone ......................................................................................................16
Table 17 Make/break pulse ratio ..................................................................................16
Table 18 Other commands.............................................................................................16
Table 19 Result code summary ....................................................................................17
Table 20 S–Register summary......................................................................................18
Table 21 Performance specifications ............................................................................21
Table 22 Telephone line interface specifications .........................................................22
Table 23 Interrupt request lines: W1..........................................................................22
Table 24 Base port address: W1...................................................................................22
