After updating to the latest version (1.12.4), the cable no longer connects to terminals, servers, or chests.
(I tested this in an environment running only this mod.)

I listened to your explanation.
Perhaps you still don't fully understand this mod.
I'll give you a simple explanation of the steps.
1: Prepare a [Network Cable] and a [Network Connector] and place them on the ground.
2: Place a [Network Server] over the connector. This will create a simple network.
3: Place a connector near the server, craft a [Network Terminal], and place it on top of the connector. The network inventory will then be displayed. You can retrieve items from there.
*By the way, a blue connector means it's not connected, and a green connector means it's connected.
------Optional from here-----
- Placing chests or assembly machines on top of the connector will provide crafting support.
- Network buffer chests are similar to [Active Supply Chests] and [Passive Supply Chests] in this game. However, research is required to start supplying.

Oh, I had misunderstood and was still thinking in terms of the old specifications from before the update.
Thank you for clearing up the misunderstanding.