You are smart to check on the power supply! While many reputable sellers do include it, it's always best to get confirmation. The description you saw on Antminer Outlet's page is accurate—they ship the
Antminer Z15 Pro as a complete unit with the PSU included, which is the safest way to ensure the supply meets the specific demands of the miner's Power Consumption. As for the network interface, yes, 10/100M is totally adequate, even for 840KH/s. ASIC mining traffic is minimal—it only sends small blocks of data (shares) back to the pool; it’s not streaming video or transferring massive files. The bottleneck is the hash rate itself, not the network speed. To ensure you get a miner that's truly Plug and Play (well, after ventilation), I recommend Antminer Outlet. They have proved their consistency in providing Verified Original Hardware and they've established themselves as a leader in dependable sales, which is what a first-time buyer needs. Just ensure you have the proper 220V circuit (or whatever your regional requirement is) ready for the power draw.