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Please also see the Buildup Plan for detailed instructions and what to consider when setting up a lecture room.
The 2 main components of the lecture hall setup are the lectern module on the stage and the FOH module and camera at some "front of house" location. They are connected by: 1 SDI cable and 1 ethernet cable. Depending on the location of the audio inputs to the hall, one or two XLR cables may also be laid to the stage or some other location in the hall. Considerations regarding network connection can be found in the Network Setup chapter.
This cabling diagram contains all connections between modules and devices (but not the inner workings of the modules): 
Note: This cabling diagram doesn't show the option to connect lectern and FOH modules via fiber yet.
Network Setup
A VOC lecture hall setup needs some internal VOC network (commonly named VOC-VLAN, even though it may not always be a VLAN technically) and a way to have internet access. Depending on the number of rooms and the network provided by the location or event there are multiple ways to connect rooms. This needs to be designed by the VOC responsible person.
The easiest setup is a single room (or multiple fully independent rooms). Since the Lectern and FOH modules both have network ports for public and VOC network and a VLAN trunk between them, it doesn't matter where the public network is connected.
Recommended Single-Room Network Setup
- Put the WRT router near the FOH module
- If the room's public network (uplink) is located at the stage:
- Connect the public network (uplink) to the "public" port of the lectern module
- Connect the WAN port of the WRT to some "public" port of the FOH module's network switch
- If the room's public network (uplink) is located near the FOH:
- Connect the WAN port of the WRT to the public network (uplink)
- Connect one LAN port of the WRT to some "VOC" port of the FOH module's network switch
- Power on the WRT router
See https://c3voc.de/wiki/hardware:wrts how to enable DHCP in the VOC-(V)LAN if needed.
Multi-Room Network Setup
Ideally there's a private VLAN between all rooms which can be used to interconnect all room setups and the office. In that case, each hall setup just needs to be connected to the venue VLAN with one "VOC" port (either at the lectern or at the FOH module -- whatever is more convenient).
When the server case is used, the router VM will provide uplink to the whole VOC network. If not, deploy one WRT router in a lecture hall or the VOC office providing a connection between public and VOC network. (Remember to enable all hall networks which are reachable via this router so that the remote access VPN works. TODO: Where is this documented?)
Fiber between FOH and Lectern
We prepared the option to use a fiber run between lectern and FOH module in 2026-11 (but the fiber is not available yet). Both sides use E2000/ LSH connectors, but you can also unplug the patch cables from the switch and SDI fiber converters and plug in a twin fiber with LC connectors instead.
Both sides use fiber core A for SDI and fiber core B for the network trunk. Both links use bi-directional optics for the links, so that we only need a twin fiber for both connections.
- The SDI link uses a 1270/1330 nm (lavender) SFP module for on the lectern side and TODO (blue) on the FOH side
- The network link uses a 1330/1270 nm (blue) SFP module for on the lectern side and TODO (lavender) on the FOH side
FOH Module
See the netbox for detailed port configuration: Case 1, Case 2, Case 3, Case 4, Case 5, Case 6
Lectern Module
Use ethernet connections at the front unless a fiber trunk is needed via the SFP slots.
Otherwise see the netbox for detailed port configuration: Case 1, Case 2, Case 3, Case 4, Case 5, Case 6