sonic-buildimage/device/alphanetworks/x86_64-alphanetworks_bes2348t-r0/media_settings.json

{
    "GLOBAL_MEDIA_SETTINGS": {
        "49-52": {
            "Default": {
                "preemphasis": {
                    "lane0": "0x0a3205"
                }
            }
        }
    }
}