# What are the limits on USB devices, hubs, and DIN interfaces?

**URL:** <https://forum.bome.com/t/what-are-the-limits-on-usb-devices-hubs-and-din-interfaces/1332>\
**Category:** Bome Products\
**Created:** [January 30, 2020, 11:27pm UTC](https://forum.bome.com/t/what-are-the-limits-on-usb-devices-hubs-and-din-interfaces/1332 "2020-01-30T23:27:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![celoranta](https://forum.bome.com/letter_avatar_proxy/v4/letter/c/dec6dc/32.png) [@celoranta](https://forum.bome.com/u/celoranta)\
**Post date:** [January 30, 2020, 11:27pm UTC](https://forum.bome.com/t/what-are-the-limits-on-usb-devices-hubs-and-din-interfaces/1332/1 "2020-01-30T23:27:03Z")

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Hi Guys.

I'm building a dual-tier keyboard setup with pedal board. Each of my three levels requires a few USB-A midi ports and a few DIN ports; all ultimately connected to my Bome Box. I'm trying to keep pre-show cabling to a minimum.

Given my setup, is it possible to create a single-wire connection from tier to tier? (I mean without purchasing more Bome Boxes. ;-) ). For example, can I put a USB hub on each tier and feed them from a master hub without fouling the BomeBox's USB-MIDI porting? (Obviously there is a power restriction... but otherwise?)

I could build [this device](https://github.com/TheKikGen/USBMidiKliK4x4) and add some shielded and buffered I2C jumper cables to solve the DIN problem... but I would still need to address the USB separately. It seems cleaner to build USB distribution (with its phantom power) and convert to DIN wherever necessary.

Suggestions?

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**Author:** ![SteveC](https://forum.bome.com/user_avatar/forum.bome.com/stevec/32/8250_2.png) [@SteveC](https://forum.bome.com/u/SteveC)\
**Post date:** [January 31, 2020, 2:32am UTC](https://forum.bome.com/t/what-are-the-limits-on-usb-devices-hubs-and-din-interfaces/1332/2 "2020-01-31T02:32:06Z")

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I can't give you a definitive answer as I believe the USB spec has a maximum number of layers/devices. I've stacked 2 layers with no trouble. Layer 1 as a Master Hub and then a few hubs attached from there. Make sure you use powered USB hubs to ensure enough current. For MIDI DIN, I attach something like [this](https://www.amazon.com/dp/B00VHL5HOA/ref=dp_prsubs_3).

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Steve Caldwell  
Bome Q and A Moderator and  
Independent Bome Consultant/Specialist  
bome@sniz.biz

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