Tranzeo TR-6015 No LAN Connect

I have setup a Tranzeo TR-6015 at a friend's restaurant to provide Internet access on their long pier. The Tranzeo is mounted and powers on; I'm able to login to it after connecting to it wirelessly. The Tranzeo is connected to a Linksys WRT54GS running DD-WRT. I am not able to get any network connection to the Tranzeo from the Linksys. The Linksys has 4 ethernet ports on the back and when I plug a laptop into any of them I immediately get a network connection. The Tranzeo does not get any connection, and the NIC lights to not light up on the Linksys when it's plugged in.

I've tried known-good regular ethernet cables and crossover cables. I have 3 Tranzeo poe injectors and have tried them all. Any ideas as to why I'm not getting a network connection? Thanks!