(The following diagram is available as an 8.5" x 11" page in DjVu format. Click it to go to the downloadable image page and click that to get a full-size image)
Diagram of classroom network devices and cables,
traced and documented by Bobby circa 2019.03.18
The following text is almost verbatim from Bobby's e-mail message. I have attempted basic formatting but it could use more reformatting work (probably as a wiki table) to make it readable.
On floor below clock: Netgear ProSAFE 16-Port Gigabit Click Switch 1 - gray - TP-Link Router 2 2 - gray - Printer (paper) computer 14 - white - open (by laser cutter) 16 - orange - renderadmin computer others - no connection On bottom shelf over sink: LinkSys VOIP Voice Phone - phone cable - Uniden EX18560 phone Internet - blue - LinkSys switch 6 C7 TP-Link AC1750 Wireless Dual-Band Gigabit Router Internet - blue - D-Link switch Ethernet 1 - gray - open 2 - yellow - TP-Link switch 7 On middle shelf over sink: D-Link Wireless AC750 Dual-Band Router DIR-817LW LAN 4 - blue - TP-Link switch 8 Internet - gray - LinkSys switch 5 TP-Link TL-SG1008D Gigabit Switch (Numbering from left to right) 1 - yellow - wall socket 2 - gray - Netgear switch 1 3 - blue - 3D printer computer 4 - no connection 5 - black - Linksys switch 1 6 - no connection 7 - yellow - TP-Link router Ethernet 2 8 - blue - D-Link router LAN 4 Linksys Gigabit 8-Port Workgroup Switch (Numbering from right to left) 1 - black - TP-Link switch 5 2 - no connection 3 - gray - open (below HARC) 4 - black - open (below HARC) 5 - gray - D-Link router Internet 6 - blue - Linksys VOIP Voice Internet 7 - blue - open (below HARC) 8 - no connection On table below TV screen: D-Link igreen DGS-1005D switch 1 - blue - TP-Link router Internet 2 - gray - open 3 - no connection 4 - no connection 5 - yellow - TV computer If I read this right 3 of the 4 switches are unnecessary!