Chinese cable operator Guangzhou Digital Media Group has selected Casa Systems' C10G CMTS for a network expansion intended to more than triple the capacity of the Casa C3Ks currently installed in Guangzhou's network.Under the terms of the agreement, Guangzhou Digital Media Group will significantly increase its Casa CMTS network and expand its coverage in the city of Guangzhou, China's sixth-largest city with an estimated population of 12.7 million.