I hope this question is in scope for this site.

While I was just about to throw away my very old internal CD Writer (PATA Interface) in E-Waste, I saw two pins on its extreme left back panel interface mentioning DIG ( D G being Pinouts) on it.

See the snapshot, the next one right to it is a 4 Pin Audio interface and next to that is Master/Slave/Cable Select pins.

Does anyone know what was this DIG? There’s absolutely no reference of it on the internet.

enter image description here

  • 5
    pure guess... S/PDIF? 'dig'...ital? That would make D, G digital & ground.
    – Tetsujin
    Dec 7, 2017 at 17:30
  • @Tetsujin your guess is right. I searched with reference of SPDIF and finally found the relevant reference here co-bw.com/DIY_SPDIF_Connection.htm
    – rajeev
    Dec 7, 2017 at 17:58
  • Oh man I miss CD burning...
    – user541686
    Dec 7, 2017 at 18:58

4 Answers 4


It is digital out. The digital auto out has both channels encoded and passed along one wire pair.

Not sure why it is labeled D/G--perhaps so you don't think you can connect it to an analog receiver--but it is signal and ground. The analog audio connector requires a pair for each channel, and it is labeled Right, Ground, Ground, Left. In reality, most analog audio connectors I have seen use a shared wire for ground so the connectors usually only have 3 wires.

  • 1
    "D" for "data"? Dec 7, 2017 at 17:55
  • 1
    @KamilMaciorowski: probably. And also "D" for "Don't connect directly to a powered speaker?
    – Yorik
    Dec 7, 2017 at 17:56
  • 6
    D for Dance and G for Groove since it is audio output :)
    – Eric F
    Dec 7, 2017 at 17:58
  • 7
    it's DIG for DIG(ital) Dec 7, 2017 at 18:47
  • 6
    Data and Ground. Because getting them backwards could do Bad Things. Dec 7, 2017 at 23:14

Digital Out. This is how it's labeled on my CD writer:


Google "cd spdif 2-pin" and you'll find suitable cables.


Digital audio output for connecting to a sound card. Back in the day it (or the analogue equivalent) was required to play CD audio through computer speakers


DIG = digital (audio output). D = data G = ground. Protocol should be compatible with S/PDIF standard, however electrical interface cannot be directly connected to any standard equipment. Signal output from CD have TTL or TTL-3v3 standard. This signal can be attached directly to any standard TOSLINK emitter but You need to add 5V supply or amplifier. This signal can be also converted to coax S/PDIF connector (signal level +/- 0.7V). Minimal set of parts include only two resistors and capacitor. Recommended set includes buffer (any logic gate).

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