What is the fine-grained topic of the following text: Lu also noted that Ubee, under the Ambit trade name[PB1] , was in the first group of companies to be awarded DOCSIS 3.0 certification by CableLabs® in 2008, and is again in the first group of vendors to receive DOCSIS 3.1 certification from CableLabs®. Only return the topic.
Ubee's DOCSIS 3.0 and 3.1 certifications by CableLabs®