Lecture Room Setup 2.0

In 2025, we finally updated our lecture room sets (aka. “cases”) to a new concept.See Case 2.0 for motivation and design decisions.

Each room setup now consist of two TRANSflex road cases with rack modules for key components.Both road cases fit on a euro pallet when tipped on their short side.So during transport each lecture room will occupy 120×80 cm (height approx. 140 cm) and during operation 2x 120x60cm are needed (height approx. 80cm).

TODO: Image of pallet

Usage

TODO: Revise signal diagram and add buildup instructions:

Assembly

FOH Module

TODO: Add images of front and back

Custom builds:

2x 0.75m cable 6.3mm Jack (stereo) → angled XLR (m): For Audio De-Embedder

6x 0.5m cable 6.3mm Jack (stereo) → d-norm XLR (m): For additional CQ18-T outputs

Steps:

Put cage nuts in rack rails:

4U on the back

4U on the front

3U on the top at (from the back side) + 2 nuts per side for CQ-18T rack mount

Mount PoE-Switch and SDI Audio De-Embedder on short rack shelf

Modify d-norm rack panel to fit TRUE1 connector (add additional hole)

Connect power distribution panel to TRUE1 connector (solder or crimp connectors)

Place remaining items on back and front

Connect ethernet and SDI cables

Connect 6.3mm jack cables to audio outputs 1 and 2 of the SDI Audio De-Embedder

Connect 1m XLR (f) to angled XLR (m) cables to the 4 audio outputs of the wireless receiver

Place audio mixer on the top, connect 4 microphone and 2 SDI channels to inputs 1-6

Connect 6.3mm jacks (from the d-norm XLR outputs) to aux channels 1-6 of the audio mxier

Screw down remaining rack panels

Items:

TODO

Lectern Module

TODO: Add pictures

Custom builds:

Solder 2 Cinch d-norm sockets to the ends of an 1.5m 3.5mm jack → 2x Cinch cable (for ATEM audio input)

TODO: Build 12V power distribution

Steps:

Preparation:

Put 16 cage nuts in the rack rails (2 rack units at the front and back)

Mount ethernet switch on rack shelf (double-sided tape) leaving 1 cm to the left side

Connect ethernet cables (to I/O panel) and dress them into a wire harness (TODO: upload picture):

3x 1.0m ethernet running in 1cm gap between switch and rack tray wall

TODO: Mount power supply on rack tray and connect to ethernet switch

Remove rack drawer from its rails and put devices on it using double-sided tape:

Mount ATEM Mini centered on right at the front edge

Mount Raspberry Pi on the left so that HDMI still goes past the ATEM mini

Mount Up-Down-Cross on right side with SDI pointing to the front and bottom side up (this way the DIP switches will still be accessible)

Place HDMI-Splitter at the back in a way that cables run fine

Connect cables running on the sliding tray:

0.5m HDMI from Raspberry Pi to ATEM Mini, Input 4

0.5m HDMI from ATEM Mini Output to HDMI splitter

0.5m HDMI from HDMI splitter to Up-Down-Cross

Connect cables running from drawer to I/O panel and dress them into a wire harness

3x 1.5m HDMI to ATEM inputs 1-3

1x 1.5m HDMI from HDMI splitter

1x 1.5m Ethernet from Raspberry Pi

1x 1.5m Ethernet from ATEM Mini

1x 1.0m SDI from Up-Down-Cross

1x 1.5m 3.5mm Jack to Cinch (d-norm, see above)

TODO: Power (don't connect to power supply yet)

Connect wire harness to I/O d-norm panel (but don't connect ethernet to the switch yet)

Now you'll have two parts: The drawer connected to the I/O panel with HDMI, SDI and audio as well as the rack tray with the ethernet switch

Assembly:

Adjust the length of the rack drawer rails and mount them in the top rack unit

Slide in the drawer:

connect with the rails

grab ethernet cables (coming from drawer) and let them hang out the back of the module

place I/O panel in front of the rack module (don't screw down yet!)

Slide in the rack tray with the switch:

screw down at lower rack unit at the back of the rack module

make sure, that the wire harness coming from the rack drawer is fully at the right side of the switch (when looking from the back of the rack module)

connect 12V power cable from wire harness to power supply

Connect I/O panel

connect 220V-side of power supply to TRUE1 socket of the I/O panel

connect the 3 ethernet cables to their respective sockets

screw down I/O panel