This is currently defined as a connection delivering at least 10 Mbps download speed and 1 Mbps upload speed.
Mae hyn yn cael ei ddiffinio ar hyn o bryd fel cysylltiad sy’n darparu cyflymder llwytho i lawr o 10 Mbps o leiaf a chyflymder llwytho i fyny o 1 Mbps.