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AT&T Network Systems, BELL ATLANTIC NYNEX Mobile, and PCSI Complete CDPD Specification 1.1 Field Trials Business Editors & Computer Writers.

SAN DIEGO--(BUSINESS WIRE)--July 17, 1995--AT&T Network Systems, BELL ATLANTIC NYNEX Mobile and PCSI(r), a wholly owned subsidiary of Cirrus Logic, Inc. (NASDAQ: CRUS), jointly announced the successful completion of the first Cellular Digital Packet Data (CDPD) specification 1.1 field trials.

The latest specification provides for improved CDPD systems performance and efficiency with the existing analog Advanced Mobile Phone Systems (AMPS). The field trials, conducted on BELL ATLANTIC NYNEX Mobile's system in Atlantic City, are a significant advancement in the deployment of CDPD networks nationwide.

CDPD is a packet data technology that builds on existing cellular infrastructure and enables mobile users to transmit data digitally at rates up to 19.2 kbps. CDPD works by transmitting data packets over existing cellular frequencies, making it a flexible and economical way to send and receive wireless data. CDPD adds packet data capability to cellular networks that already support circuit-switched data and voice. CDPD is currently available in 32 cities nationwide. Rand Baldwin, executive director for the CDPD Forum, commented on the specification 1.1 trials stating, "These trials underscore the industry's commitment to the rapid deployment of CDPD throughout the United States. CDPD's momentum is building, and these trials are excellent examples of how vendors, integrators and carriers are working together to bring the benefits of CDPD technology to users nationwide."

The field trials were conducted using both CDPD specification 1.1-compatible infrastructure and subscriber (end-user) products. Among the capabilities confirmed was the coexistence between CDPD and AMPS operations without any call interference. Additionally, the trials verified that CDPD coverage in each cell replicates the AMPS footprint.

AT&T Network Systems acted as the systems integrator, providing a complete CDPD specification 1.1 network using PCSI hardware and BELL ATLANTIC NYNEX Mobile cell sites for service. AT&T Network Systems was instrumental in supporting the entire field trials and ensuring network interoperability.

BELL ATLANTIC NYNEX Mobile plans to implement specification 1.1 to its CDPD systems this year while continuing the support of specification 1.0 customers for as long as necessary.

AT&T Network Systems is one of the world's largest manufacturers of network telecommunications equipment. It offers communications service providers virtually everything they need to build and operate their landline and wireless networks.

BELL ATLANTIC NYNEX Mobile, headquartered in Bedminister, New Jersey, is the largest wireless service provider on the East Coast and the second largest provider in the United States. The company offers a full range of wireless voice, data, and paging communications solutions to its three million customers in the Northeast, mid-Atlantic, Southeast, and, through a separate subsidiary, in the Southwest. The company was formed in July 1995 through the combination of Bell Atlantic Mobile's and NYNEX Mobile's cellular operations.

PCSI has been a CDPD pioneer since 1991, and field trials of the CDPD specification 1.1 represent yet another in a string of CDPD firsts for PCSI.

Since 1991, PCSI has developed a number of CDPD products including multi-mode modems, infrastructure equipment and a range of OEM products. PCSI is also a member of the CDPD Forum, the association responsible for establishing CDPD specifications and certification processes.

PCSI is a leader in the supply of products and technology for advanced wireless communications and telecommunications around the world. It is the world's leading supplier of infrastructure and end-user products supporting CDPD and holds the ISO 9001 Quality System Certification.

CONTACT: PCSI

Gwen Carlson, 619/535-9500, ext. 2071

glc@pcsi.cirrus.com
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Publication:Business Wire
Date:Jul 17, 1995
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