In Hay 1978, the Broadband Communications Section of the EIA Communications Division authorized the formation of sub-committee TR 40.1 to develop industrial standards for data modems that would be used on broadband cable networks. A subcommittee comprising industrial end-user representatives and modem manufacturers was formed in late 1918. Three smaller groups were established to provide the initial recommendations on 1) channel allocation, 2) ca&le system parameters, and 3) modem parameters. The paper presents the current status of the committee's work which used, as a guideline, present CATV technical standards.