sonic-buildimage/device/quanta/x86_64-quanta_ix8a_bwde-r0/media_settings.json

{
    "GLOBAL_MEDIA_SETTINGS": {
        "1-48": {
            "Default": {
                "preemphasis": {
                    "lane0": "0x063203"
                }
            }
        },
        "49-56": {
            "Default": {
                "preemphasis": {
                    "lane0": "0x0a500a",
                    "lane1": "0x0a500a",
                    "lane2": "0x0a500a",
                    "lane3": "0x0a500a"
                }
            }
        }
    }
}