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AES/EBU DIO OPTION
UNIT•Y cards with AES/EBU input/output option
An 8 channel AES/EBU digital input/output option may be bought with the UNIT•Y card, or
added later on. The industry standard of digital audio transmission, AES3, normally referred
to as AES/EBU, is found on most professional audio equipment. Two channels of up to 24
bit audio is transmitted over one balanced cable. XLR type of connectors are specified.
On the AES/EBU extension of the UNIT•Y card, space has prevented us from utilizing 8
XLR connectors. Instead we have used a 25-pin SubD connector of the same type and with
the same pin assignment as on Yamaha's single slot AES/EBU card, but the electrical
format is true AES/EBU with all inputs and outputs being transformer balanced. The robust
AES/EBU signal may be transmitted over a long distance and travel through patch-bays
etc, but the timing reference signal should be kept separately.
If you use an AES/EBU router or mechanical patch-bay, you might consider making your
own multiway cable with the terminations you need. For AES/EBU signals, relatively thin
and cheap twisted pair computer cable with a common screen is a good solution. If you use
twisted pair cable with 90-120ž impedance, the results are normally better than with more
expensive AES/EBU cable.
Remember to observe the twisting for pair identification.
Pin assignment, AES/EBU 25-pin SubD connector
Pin number
1
2
3
4
5
6
7
8
9, 11
10, 12, 13
14
15
16
17
18
19
20
21
22, 23, 24
25
Assignment
Cable pair number
Input 1/2 +
Input 3/4 +
Input 5/6 +
Input 7/8 +
Output 1/2 +
Output 3/4 +
Output 5/6 +
Output 7/8 +
No connection
Common
Input 1/2 -
Input 3/4 -
Input 5/6 -
Input 7/8 -
Output 1/2 -
Output 3/4 -
Output 5/6 -
Output 7/8 -
Common
Common
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Shield
36
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