Wikipedia
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
D-subminiature connectors are used to carry balanced analog or digital audio on many multichannel professional audio equipment, where the use of XLR connectors is impractical, for example due to space constraints. The most common usage is the DB25, using TASCAM's pinout (now standardised in AES59). To avoid the possibility of bent pins on fixed equipment, the male connector is generally fitted to the cabling and the female connector to the equipment. The DD50 connector usage is described in AES-2id.
DA15
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DB25
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Lynx AES16(e) Digital I/O Pinout using HD26
Pin
1
2
3
4
5
6
7
8
9
DD50 — AES-2id "High-density AES connections"
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DD50 — Quartz
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17