Advanced network equipment

Dallas-based DSC Communications Corp. and MCI Communications Corp. have signed a three-year contract for DSC`s advanced network equipment. The $300 million agreement calls for the delivery of DSC`s switching and transmission products and includes an option to purchase its access and broadband system products. DSC Communications and General Datacomm Inc., Dallas, have also signed an agreement that provides for the integration of asynchronous transfer mode technology into DSC`s product line.