Extending wifi to remote garage

 currently have a Cox modem/router PW7 in the house and I have ran a Cat6 cable from it to the remote garage. In the garage I have a new RAX54S but cannot get it to have internet access.....any suggestions on hold to get it to connect? I have an external access point device and it works fine when connected to the cable in the remote garage so its something to do with the setup either in the cox router or the RAX54S. Should I be looking at setting up this second router as a bridge? The RAX will mostly be used with wireless devices but it will also have the wired access point. Thanks in advance