If it doesn't appear on your router as a device, you're not going to access it.
I had such a problem once and I tried a different ethernet cable. Low and behold the router recognized the miner.
These cables are generally cheap, and it's not unreasonable to be 'suspect' of them.
Unless the network lights aren't lit when the miner is powered on, this shouldn't be necessary.
The most common problem here is that some people have trouble understanding how Antminers are connected to their network.
I think OP should be able to fix his problem with what's been posted above.