MSB Fiber Connections - Stock SFP Transceivers and AOC Cables
This technology can get complicated fast, so please watch the entire video or read this entire guide all the way through before experimenting with your MSB equipment. Your DAC could be permanently damaged if the wrong cabling is used. There are a lot of names and technical configurations we will be discussing, so please check the “Cable Specifications” portion of this guide before purchasing any cabling to ensure it will be compatible.
Our ProISL and Cascade fiber link is not Ethernet. It is not based on fiber ethernet protocols in any way. And it runs at much lower power levels than fiber ethernet interfaces. Plugging ethernet fiber into an MSB product can burn out the optical receivers and will require replacing the SFP modules.
We use SFP fiber technology as a physical platform, but the data and the way we use it is completely unique to MSB. Pro ISL protocols are entirely different from the link between Digital Directors and their Analog Converters. There is absolutely no room for experimentation on gear configurations. Only use as intended and labeled.
Benefits of AOC
At MSB, we’re always exploring ways to reliably push performance through technology advancements. As it turns out, AOC connections show a lot of promise. Our DACs rely on fiber because it gives us total galvanic isolation with seemingly infinite cable lengths all while providing extreme data bandwidths.
The stock setup we ship with works very well as a reliable reference. But, like many of you, we’re curious — is there a way to get just a bit more out of an MSB DAC?
That’s where Active Optical Cables come in. An AOC combines the fiber cable and the transceivers into one closed system. No separate modules. No separate cable. A closed and perfectly matched system.
The simplicity of this system is key. You remove extra junctions with no mismatched parts, no dirty fiber ends, no half-seated connectors. This matched system can run at twenty percent reduced power consumption achieving further benefits with a lower noise floor. The cable itself is tuned for the specific laser light wave length and cable length and doesn’t need to overcome any air gaps.
While the results may vary somewhat by a listener’s system, the overwhelming response of our beta testers have consistently reported significant improvements using AOC on the Cascade DAC and Digital Directors alike.
Stock SFP Modules and Cables
Fiber SFP modules are hot swappable. That means you can experiment without powering off equipment, but you must exercise basic ESD precautions. Before touching the SFP module, always ground yourself to the chassis with your other hand.
Let’s first explain the stock configuration. Every DAC ships with two matched single-mode SFP optical modules, already installed. There will be a single-mode duplex LC fiber patch cable to connect them. This is a tried-and-true reliable system. You can plug and unplug this fiber cable almost indefinitely, and if any part wears out, it’s easy and inexpensive to replace.
But it does require some care.
When handling SFP modules and fiber cables:
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Make sure the connectors are clean and free of dust.
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Always push the cable in until you feel the click.
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And double-check the latch on the module is closed. Leaving it open can cause grounding issues.
We recommend using this configuration for those of you who like to A/B test cables, gear, or swap connections often. It’s durable, modular, and designed for frequent changes.
For removing these fiber cables, depress the plastic locking clip and pull the cable. When inserting the cable, make sure the lock audible clicks into place. Make sure it is firmly seated.
To change out the SFP modules, swing the removal lever out. This will disengage the locking mechanism and allow the SFP module to be pulled free. Pull the module out by the lever arm itself, not the body. If the SFP module is unlocked correctly the module should slide out easily with little to no effort. If it seems stuck… DO NOT force it. It is likely still locked in place.
When inserting a new SFP module, make sure it is firmly inserted, then close the lever arm into its stored position. If this lever is left open, it can short the isolated connection to the chassis and will prevent the DAC from working.
DO NOT LEAVE THE RELEASE LEVER IN THE OPEN POSITION AS SHOWN BELOW
AOC Cables
Every time you remove and insert the cabling, you are wearing out a direct connection on the PCB motherboard itself. That means the wear point shifts from the removable and replaceable SFP modules to the motherboard. If worn out to an unreliable state, the motherboard will need to be replaced on both the Digital Director and Analog Converter. This will NOT be a warranty repair.
The sockets are only rated for a few hundred plug cycles. Depending on the SFP module, it could be as few as 200 to 300 insertions. For any home installation, this will not be a concern. If the system is installed and infrequently moved you will never run into this issue.
This is a severe warning for dealers, demos, and the enthusiast who wants to constantly experiment and A/B cabling in their system. It is a lot of insertions, but we want to make sure you are very aware of the potential cost when and if there is a related failure due to excessive insertions. We don’t want to scare you off from trying AOC, as the sonic benefits are well worth it for long term use.
To change out the AOC cable, simply pull on the integrated release tab. This will disengage the locking mechanism while the SFP module pulls free.
When inserting a new AOC cable, simply make sure it is firmly inserted and latched in place.
DO NOT Use the Following Cables - DACs and Passive Cables
Do not use Direct Attach Copper cables — often called “DAC” cables.
They may look similar to AOCs, but they bypass isolation, can carry electrical noise, and will damage your DAC’s motherboard.
Another cable to avoid is called a “passive” cable. This is a hardwired version and will similarly damage the product.
MSB products are designed specifically for optical cables/transceivers only.
Fiber Buying Guide
Tips for choosing replacement SFP modules and cables.
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SFP modules need to be ordered as a set, and have the same module at both ends.
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The ideal SFP module will be single mode, which has the lowest jitter possible.
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Maximum power consumption must be under 2 watts, Ideally 1 watt or less for best performance
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The cable ordered must match whatever SFP module type is ordered.
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For example, a Single Mode SFP module should have a single mode Fiber patch cable
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The cable length needs to be a minimum of 2 meters or longer in length.
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We will have some recommended options included in the written guide.
Stock SFP Module - https://www.fs.com/products/75326.html?attribute=5939&id=4610587
Specifications:
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Transceiver Model: SFP1G-LX-31
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Compatible Brand: Generic
Stock Fiber Cable - https://www.fs.com/products/50147.html?now_cid=2866
Specifications:
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Length: 2M or Greater
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Connector A: LC UPC
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Connector B: LC UPC
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Fiber Grade: G.567.A1
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Cable Jacket: LZSH
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Cable Diameter: 3mm
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Polarity: A (Tx) to B(Rx)
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Color: Any
Tips for choosing AOC modules/cables.
If you want to try an AOC cable, here’s what to look for:
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It must be 10 Gigabit SFP+ architecture.
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Higher-speed cables like 25G or 100G may work, but they’re not optimized for audio use and can sometimes reduce performance. They will use additional power and add more noise to the system. More isn’t always better.
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Maximum power consumption must be under 2 watts, Ideally 1 watt or less for best performance
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Length doesn’t matter for AOC cables — pick whatever fits your setup.
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Color doesn’t matter either — the orange and teal jacket colors are the same performance, it’s just an indicator for different manufacturing standards.
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And remember, any brand of 10G AOC should work. This is a standardized platform, so anyone manufacturing to the spec should be a compatible option.
Recommended AOC Cable - https://www.fs.com/products/74607.html?attribute=10633&id=2101152
Specifications:
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Length: Any
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Compatible Brand: Any
