$ ffado-dbus-server  -v 7 2>/dev/null
Summary
-------

Nr | AddressType     | Direction | SubUnitType | SubUnitId | FunctionBlockType | FunctionBlockId | Id   | Type         |Name
---+-----------------+-----------+-------------+-----------+-------------------+-----------------+------+--------------+------
 0 |         subunit |     Input |       Audio |      0x00 |              0xff |            0xff | 0x00 |       Analog | ASU Audio Input Ext 1/2
 1 |         subunit |    Output |       Audio |      0x00 |              0xff |            0xff | 0x00 |       Analog | ASU Audio Output Ext 1/2
 2 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x00 |    IsoStream | MSU Compound Input
 3 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x01 |       Analog | MSU Audio Input 1/2
 4 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x02 |       Analog | MSU Audio Input 3/4
 5 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x03 |      Digital | MSU Audio Input SPDIF
 6 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x04 |         MIDI | MSU Midi Input
 7 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x05 |         Sync | MSU Sync Input
 8 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x00 |    IsoStream | MSU Compound Output
 9 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x01 |       Analog | MSU Audio Output 1/2
10 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x02 |       Analog | MSU Audio Output 3/4
11 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x03 |       Analog | MSU Audio Output 5/6
12 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x04 |       Analog | MSU Audio Output 7/8
13 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x05 |      Digital | MSU Audio Output SPDIF
14 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x06 |         MIDI | MSU Midi Output
15 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x07 |         Sync | Firewire Bus
16 |             PCR |     Input |        Unit |      0xff |              0xff |            0xff | 0x00 |    IsoStream | Slave to Audio Clock Master
17 |             PCR |     Input |        Unit |      0xff |              0xff |            0xff | 0x01 |         Sync | PCR Sync Input
18 |             PCR |    Output |        Unit |      0xff |              0xff |            0xff | 0x00 |    IsoStream | PCR Compound Output
19 |             PCR |    Output |        Unit |      0xff |              0xff |            0xff | 0x01 |         Sync | PCR Sync Output
20 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x00 |         MIDI | Ext Midi Input
21 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x01 |       Analog | Ext Audio Input 1/2
22 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x02 |       Analog | Ext Audio Input 3/4
23 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x03 |      Digital | SPDIF Input
24 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x04 |      Unknown | Device Internal Clock
25 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x05 |      Unknown | Firewire Bus
26 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x00 |         MIDI | Ext Midi Output
27 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x01 |       Analog | Ext Audio Output 1/2
28 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x02 |       Analog | Ext Audio Output 3/4
29 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x03 |       Analog | Ext Audio Output 5/6
30 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x04 |       Analog | Ext Audio Output 7/8
31 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x05 |      Digital | Ext SPDIF Output

Connections
-----------
digraph avcconnections {
	"(21) Ext Audio Input 1/2" -> "(0) ASU Audio Input Ext 1/2"
	"(0) ASU Audio Input Ext 1/2" -> "(1) ASU Audio Output Ext 1/2"
	"(1) ASU Audio Output Ext 1/2" -> "(3) MSU Audio Input 1/2"
	"(16) Slave to Audio Clock Master" -> "(2) MSU Compound Input"
	"(22) Ext Audio Input 3/4" -> "(4) MSU Audio Input 3/4"
	"(23) SPDIF Input" -> "(5) MSU Audio Input SPDIF"
	"(20) Ext Midi Input" -> "(6) MSU Midi Input"
	"(24) Device Internal Clock" -> "(7) MSU Sync Input"
	"(8) MSU Compound Output" -> "(18) PCR Compound Output"
	"(9) MSU Audio Output 1/2" -> "(27) Ext Audio Output 1/2"
	"(10) MSU Audio Output 3/4" -> "(28) Ext Audio Output 3/4"
	"(11) MSU Audio Output 5/6" -> "(29) Ext Audio Output 5/6"
	"(12) MSU Audio Output 7/8" -> "(30) Ext Audio Output 7/8"
	"(13) MSU Audio Output SPDIF" -> "(31) Ext SPDIF Output"
	"(14) MSU Midi Output" -> "(26) Ext Midi Output"
	"(15) Firewire Bus" -> "(19) PCR Sync Output"
	"(0) ASU Audio Input Ext 1/2" [color=green,style=filled];
	"(1) ASU Audio Output Ext 1/2" [color=green,style=filled];
	"(2) MSU Compound Input" [color=green,style=filled];
	"(3) MSU Audio Input 1/2" [color=green,style=filled];
	"(4) MSU Audio Input 3/4" [color=green,style=filled];
	"(5) MSU Audio Input SPDIF" [color=green,style=filled];
	"(6) MSU Midi Input" [color=green,style=filled];
	"(7) MSU Sync Input" [color=green,style=filled];
	"(8) MSU Compound Output" [color=green,style=filled];
	"(9) MSU Audio Output 1/2" [color=green,style=filled];
	"(10) MSU Audio Output 3/4" [color=green,style=filled];
	"(11) MSU Audio Output 5/6" [color=green,style=filled];
	"(12) MSU Audio Output 7/8" [color=green,style=filled];
	"(13) MSU Audio Output SPDIF" [color=green,style=filled];
	"(14) MSU Midi Output" [color=green,style=filled];
	"(15) Firewire Bus" [color=green,style=filled];
	"(16) Slave to Audio Clock Master" [color=coral,style=filled];
	"(17) PCR Sync Input" [color=coral,style=filled];
	"(18) PCR Compound Output" [color=coral,style=filled];
	"(19) PCR Sync Output" [color=coral,style=filled];
	"(20) Ext Midi Input" [color=slateblue,style=filled];
	"(21) Ext Audio Input 1/2" [color=slateblue,style=filled];
	"(22) Ext Audio Input 3/4" [color=slateblue,style=filled];
	"(23) SPDIF Input" [color=slateblue,style=filled];
	"(24) Device Internal Clock" [color=slateblue,style=filled];
	"(25) Firewire Bus" [color=slateblue,style=filled];
	"(26) Ext Midi Output" [color=slateblue,style=filled];
	"(27) Ext Audio Output 1/2" [color=slateblue,style=filled];
	"(28) Ext Audio Output 3/4" [color=slateblue,style=filled];
	"(29) Ext Audio Output 5/6" [color=slateblue,style=filled];
	"(30) Ext Audio Output 7/8" [color=slateblue,style=filled];
	"(31) Ext SPDIF Output" [color=slateblue,style=filled];
}
Use "dot -Tps FILENAME.dot -o FILENAME.ps" to generate graph