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Digital Coaxial cable Wiki

Coaxial vs

RG-142 Coaxial cable

Your Squeezebox has two digital outputs - a coaxial one and an optical one. Which should you use?

Coaxial digital

Coaxial digital refers to converting the digital S/PDIF signal to a voltage level and transmitting it electrically. Coaxial digital connectors are coloured orange. The cables look like conventional analog left/right RCA cables. However these cables have to have an impedance of 75 ohms.

What does that mean? It means you can use a cable specifically designed as a coaxial digital cable as it meets this specification. Analog video cables will also meet this specification, the plugs are usually coloured yellow. Regular audio cables whose connectors are usually coloured white and red may or may not work - they do not have to meet the 75-ohm criteria, although some do.

Optical digital

Optical digital refers to converting the digital S/PDIF signal to light and transmitting it through a fibre optic cable that conducts light. Specifically, the S/PDIF signal is used to modulate (vary the intensity) of a red LED. A light receiver on the other end receives the light and decodes the signal from it based on the light modulation. As long as the Squeezebox is powered there should always be a red light illuminated in the optical digital output, even when it's not playing any music. You should be able to see this light coming through the edges of the door of the Squeezebox's optical digital output, and if you insert an optical digital cable into this output, red light should come out the opposite end of the cable.

Since Toshiba developed this technology, you may see it referred to as "Toslink".

Optical digital jacks are squarish inset connectors covered by a small hinged door. The optical digital cable has a connector that pushes the door out of the way and locks in place. The end of the optical digital cable has a tiny lens that contacts the LED. Take great care not to scratch this lens! Many optical cables come with covers to protect the lens when the cable is not connected. Use these covers and do not lose them. Some covers even come attached to the cable.

Optical digital cables can be made internally out of glass or plastic. Glass is known to transmit light better and some state that this will lead to better sound. However the needs of S/PDIF are well-met by plastic cables since the demands of S/PDIF are quite modest for fibre optic technology. You may not hear any difference in your equipment. This is a subject of considerable controversy and if you feel this is important, you should do further research, ask questions or conduct listening tests.



TNP Products TNP Premium Dual 1/4 Inch To Dual RCA Audio Cable (3FT) - Male 6.35mm 1/4" Phono Mono to RCA Connector Wire Cord Plug Jack
Home (TNP Products)
  • This cable is designed to connect gear with stereo unbalanced phone jacks to gear with stereo phono jacks; Delivers high performance and versatile full range bass...
  • Built with heavy duty thick shielding, high-quality polished metal connectors and corrosion-resistant gold-plated RCA connectors; protection against radio frequency...
  • Balanced solid conductors for enhanced internal noise rejection and clearer, deeper bass and eliminate strand-interaction distortion; Solid-core bass conductor optimizes...
  • Oxygen Free Copper Lines combined with a double shielding allow for a maximum audio quality; reduce distortion and signal loss; minimizes return loss, so music...
  • Connects audio devices with the 6.35 mm (1/4 in) plugs audio port to AV receiver, amplifier, Hi Fi stereo audio system, home theater system, computer sound, recording...
TNP Products TNP Premium Dual 1/4 Inch To Dual RCA Audio Cable (3FT) - Male 6.35mm 1/4" Phono Mono to RCA Connector Wire Cord Plug Jack
Home (TNP Products)
  • This cable is designed to connect gear with stereo unbalanced phone jacks to gear with stereo phono jacks; Delivers high performance and versatile full range bass...
  • Built with heavy duty thick shielding, high-quality polished metal connectors and corrosion-resistant gold-plated RCA connectors; protection against radio frequency...
  • Balanced solid conductors for enhanced internal noise rejection and clearer, deeper bass and eliminate strand-interaction distortion; Solid-core bass conductor optimizes...
  • Oxygen Free Copper Lines combined with a double shielding allow for a maximum audio quality; reduce distortion and signal loss; minimizes return loss, so music...
  • Connects audio devices with the 6.35 mm (1/4 in) plugs audio port to AV receiver, amplifier, Hi Fi stereo audio system, home theater system, computer sound, recording...
Gefen Gefen Digital Audio To Analog Audio Adapter/Converter (GTV-DIGAUD-2-AAUD)
CE (Gefen)
  • Takes a coaxial/optical (S/PDIF or TOSLink) digital audio source and converts it to standard analog left/right audio, available for connection to an external device...
  • Bridge your legacy sound system with digital sources such as DVD and CD players that don t have RCA-style analog outputs.
  • Accepts uncompressed digital audio as input with 32, 44.1, 48 and 96 KHz sample rates
  • Supports 2-channel LPCM (Linear Pulse Code Modulation) and 24-bit S/PDIF incoming bitstream on left and right channels.
  • Compact and easy to install.
Shanhai Shanhai® 105360 75 Ohm Quad Shielded Cl2 F-type Coaxial Rf Cable
Speakers (Shanhai)
  • Quad-shielded RG6 video cable with two layers of copper braid and two layers of aluminum foil shielding
  • 75 ohm impedance
  • CL2 rated for safe use inside the walls of residential buildings
  • Molded connector heads and strain relief boots
  • Gold plated male F-Type connectors
MXtechnic MXtechnic 90 Degree Right Angle HDMI Female to Male Adapter for HDTV and Monitors Supports 4K UHD resolution and 3D (5 of Pack)
Wireless (MXtechnic)
  • HDMI Male to Female Right Angled Adapter 90 Degrees
  • Fully compliant with the latest HDMI standard, these right angle and left angle HDMI adapters are capable of carrying the increased bandwidth of HDMI 2.0 at 18 Gbps
  • Support resolutions up to 4Kx2K (UHD) including 4096x2160, 3840x2160, 2560x1600, 2560x1440, 1920x1200, and 1080p
  • Support Audio Return Channel (ARC), HDMI Ethernet Channel (HEC), 48 Bit Deep Color, 32 channel audio, HDCP, Dolby True HD 7.1 audio, and 3D video
  • 5 x 90 degree hdmi adapter



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