Cascade Communications Selected To Provide Frame Relay Backbone for Pacific Bell, and Nevada's First Frame Relay Service Implementation; Cascade Substantially Increases Capacity of Pacific Bell's Switch Trunking Capabilities.

WESTFORD, Mass.--(BUSINESS WIRE)--June 20, 1995--Cascade Communications Corp. (NASDAQ:CSCC) today announced that it has been selected to provide Pacific Bell's FasTrak Frame Relay service backbone for its greater San Francisco Bay and Los Angeles areas.

The telecommunications giant will purchase Cascade Communications products to scale Frame Relay deployment beyond Pacific Bell's original plans. Today's announcement establishes Cascade as a Frame Relay WAN switch vendor for five out of seven RBOCs (Regional Bell Operating Companies).

In a separate RFP, Pacific Telesis' subsidiary Nevada Bell also has awarded Cascade a contract to provide the first Frame Relay service implementation in Nevada Bell's territory. Cascade B-STDX switches will provide high speed trunking to ATM services.

"Pacific Bell is experiencing tremendous growth in deployment of FasTrak Frame Relay services as more and more customers seek the economic, performance and reliability benefits of Frame Relay for consolidating their legacy and LAN internetworking traffic," said Joe Simone, Pacific Bell's executive director of Advanced Digital Services. "To meet this soaring demand, Pacific Bell must continue to enhance its Frame Relay network with its existing multi-vendor strategy to better support customers' needs. We chose Cascade for our Frame Relay backbones due to its high port density, high-speed trunking and interoperability with our installed-base, multi-vendor network. We wanted to add efficiency to the backbone of our Frame Relay network, making it better but without changing the service or impact to existing customers."

The Pacific Bell fast packet agreement calls for the initial deployment of numerous Cascade B-STDX 9000 multiservice switches, one of the industry's first multiservice wide area network switches. The 16-slot, fully-redundant platform provides a solution for trunking at T3 speeds between switches. Cascade's solution will exponentially increase Pacific Bell's Frame Relay trunking capabilities, enabling the telecommunications company to keep pace with the exploding demand for Frame Relay services.

"California is one of the fastest growth areas for Frame Relay services and has benefited significantly from Pacific Bell's early recognition of the technology's benefits and the company's rapid deployment of Frame Relay services," said Daniel E. Smith, president and CEO for Cascade Communications Corp. "We are pleased that Cascade's B-STDX switches have been selected as a key component of Pacific Bell's future growth strategy, enabling the telecommunications company to sustain its impressive rate of success in Frame Relay deployment."

The Nevada Bell contract includes the initial deployment of B-STDX 9000 switches with T1 interfaces.

Pacific Bell and Nevada Bell are subsidiaries of Pacific Telesis Group, a diversified telecommunications corporation based in San Francisco.

One of the world's fastest growing data communications companies and price/performance leader in Frame Relay, Cascade Communications of Westford, Mass. is a global provider of wide are networking products for the enterprise and public carrier network markets. The pioneer of multiservice WAN switches, Cascade delivers enterprise-ready switches and network management solutions that enable customers to seamlessly integrate existing technologies with ATM for cost-effective network expansion and investment protection. Cascade's STDX and B-STDX multiservice switches and the recently introduced Cascade 500 ATM switch offer the highest scalability and network capacity in the industry. Worldwide, private and public networks such as BellSouth, Bridge Information Systems, GTE, Pacific Bell, US West, WilTel, and British Telecom rely on Cascade products for unparalleled quality of service and high-performance WAN services.

CONTACT: Neva Group Inc.

Maureen Liberty/Patty Anderson, 617/441-4000

or

Cascade Communications Corp.

Investor Relations, 508/952-2552

or

Pacific Bell

Scott Smith, 415/542-0597