ADTRAN Introduces Second Generation ISDN Range Extension Equipment Allowing ISDN Service without Switch Upgrades, Units to be Shown at SUPERCOMM.

ANAHEIM, Calif.--(BUSINESS WIRE)--March 20, 1995--ADTRAN, Inc. (NASDAQ:ADTN), a leading supplier of voice and data communications products, will introduce at SUPERCOMM a new generation of ISDN range extension products, allowing increased availability of ISDN.

"The ISDN Basic Rate Digital Subscriber Loop was designed to utilize the telcos' existing copper cables. In practical terms, Basic Rate ISDN can be delivered across most two-wire circuits at distances of up to 18,000 ft," Product Manager Wayne Cranford said. "ADTRAN has developed a suite of range extension products to assist the telcos in the delivery of highly-sought Basic Rate ISDN to customers outside the limits of an ISDN equipped central office."

ADTRAN U-BRITE II

The U-BRITE II, the next generation of the highly successful U-BRITE, is designed for use in the AT&T D4, SLC(R)-96 and WECO(R) mechanically-equivalent channel banks. The U-BRITE II converts the two-wire U-interface signal into a three DS0 format for transport across T1 carrier facilities, permitting the delivery of BRI services to non-ISDN central offices and across digital loop carrier systems. Test features allow for circuit segmentation and trouble isolation that can be initiated from either an ISDN switch or from the faceplate of the U-BRITE II.

The U-BRITE II offers improved test and diagnostic capabilities from the faceplate of the unit. LEDs located on the faceplate provide immediate loop and carrier synchronization status, Layer 1 activation status, CRC status for quality monitoring of the loop and carrier data paths, and a remote loopback indication confirming successful loopback of a downstream device. A test rotary switch is used to select the desired test and location of downstream units. The U-BRITE II will be available in standard and mechanized loop testing (MLT) versions in April 1995 with pricing beginning with a list price of $473.

ADTRAN SLC-5 U-BRITE

The SLC-5 U-BRITE is designed for use in AT&T SLC Series 5 Feature Package C (FPC) central office terminals (COTs). It may also be used in SLC Series 5 Feature Package C with AutoCut (FPC/AC) or enhanced Feature Package B (FPB) remote terminals (RTs). The operation and features of the SLC-5 U-BRITE are comparable to the ADTRAN D4 U-BRITE II with MLT. The faceplate allows for loopbacks in the network-to-customer direction and provides immediate indications of the loop, carrier and synchronization status. When used in conjunction with the ADTRAN SLC-5 NULL card, the SLC-5 U-BRITE can operate in a SLC Series 5 channel bank without the common equipment upgrades that support ISDN.

ADTRAN has obtained the necessary license that grants the rights to develop a SLC-5 U-BRITE. The SLC-5 U-BRITE, NULL card and Associate Blank card are currently available with a list price of $636 for the SLC-5.

ADTRAN ISDN U-Repeater III

The U-Repeater III leading ISDN U-Interface Loop Repeater extends the ISDN Digital Subscriber Loop (DSL) by recovering and regenerating the ISDN 2B1Q signal. Enhancements incorporated in the U-Repeater III include: 18,000 ft capability on either side of the repeater for a maximum extension of 36,000 ft; an LED power indicator, net-work side synchronization, and customer side synchronization; low power dissipation (less than 1.4 watt); and performance monitoring in accordance with TR-NTW-000829. The U-Repeater III is powered from the CO by the ADTRAN U-RPM II or U-RPM III, available in D4 and Type 400 form factors.

The U-Repeater III is available in four types of enclosures that include a dual circuit package for use in an ADTRAN repeater housing, a single circuit package for use in either an ADTRAN repeater housing or standard T1 housing, a single circuit package for use in standard T1 housing only, and an encapsulated single circuit package that is weatherproof and can be mounted in a pedestal, manhole, pole, or any other suitable locations. All versions of the ADTRAN U-Repeater III will be available in April 1995 with a list price of $650.

Corporate Overview

ADTRAN was established in 1985 to design, develop and manufacture advanced transmission products for high-speed digital communications. In addition to its HDSL products, ADTRAN is the primary provider of DDS and ISDN digital loop products to Regional Bell Operating Companies and many well known OEMs. The broad selection of customer premise products offered by ADTRAN includes a complete line of DSU/CSUs, a variety of ISDN extension and network terminating products and flexible T1 multiplexers. For more information regarding ADTRAN and its products, call 1-800-326-3700, fax [phone] or e-mail: [e-mail].

CONTACT: ADTRAN, Inc., Huntsville

Media Relations: Stacy Thomas, 205/971-8488

Product Manager: Wayne Cranford, 205/971-8737