Panoramic Modem Admin Username and Password

I recently upgraded to the Panoramic modem/wifi device (model CGM4141). Unfortunately the Cox wifi extender (model WCB6200Q) that used to work with the prior Cox modem/wifi device (model TG2472G) doesn't work with the Panoramic modem (per Cox). So I bought a NetGear EX8000 wifi extender to provide service to a couple of dead spots in my house. To properly set the switches and the interface between the devices does anyone know the admin username and password for the Panoramic modem?

P.S. I'm not asking for the SSID and password that's on the modem. I am specifically asking for the administrator's username and password.