June 30, 2005 San Jose, CA -- Integrated Device Technology (IDT) has introduced a line of high-density T1/E1/J1 line interface units (LIUs). The products, which include 28-, 21- and 16-channel options in ultra-small packages, are designed to enable tributary aggregation in applications such as multi-service provisioning platforms (MSPPs), optical multiplexers, edge routers, and wireless transport systems.

The company says the high-density LIU devices offer nearly four times the density of other LIU platforms on a single chip, reducing board space by 20%. The company says the devices also offer flexible line and system interface configuration options to address a wide range of applications. An industry-standard system interface ensures support for both commercial and custom framing and mapping circuits with standard TDM interfaces.

According to the company, each channel of the device can be selected to operate independently in T1, J1, or E1 (75/120-ohm) mode. Fully integrated and software-programmable internal impedance circuits enable designers to save external components and address multiple markets with a single bill of materials. The devices also offer various line termination configuration options, including single-ended termination for E1 applications on the primary and secondary side of the transformer. The company says up to 63 backplane traces can be saved when routing lines from the I/O panel to the LIU. Transformer-less operation and single-ended termination mode for differential T1/J1 and E1 lines also enable additional space and cost savings in intra-building applications, according to the company.

The company says the LIU devices' optimized architecture supports 1+1 and 1:1 hitless protection switching without external relays, thereby enabling redundancy in high-availability systems. The devices also feature the provision of two output clocks derived from any of the recovered line clocks. An integrated clock synthesizer is available as an option to scale these clocks to a wide range of frequencies from 8 kHz to 32.768 MHz. A cascading feature is also provided to select a single reference clock from multiple devices without the need for any external logic.

The devices ensure standards compliance by meeting or exceeding ANSI, ITU, ETSI, and AT&T specifications. Dedicated monitor channels that meet the ITU G.772 requirements for in-service monitoring are available on every device option (i.e. 28(+1), 21(+1), 16(+1) channel).

"IDT LIU solutions have achieved prodigious success with top vendors in the metro optical transport market, and today we're giving our customers a powerful new set of products to enhance the next generation of these systems. Multi-service provisioning platforms are a great example of this," remarks Sean Fan, director of marketing for the telecommunications products division at IDT. "By integrating up to 28 ports with software impedance matching, termination components, and frequency synthesizers, the IDT high-density LIUs reduce power, board space, and cost - three crucial considerations in these compact systems. Moreover, key features such as per-channel control of T1, E1, or J1 formatting and in-service testing translate into system-level functionality that ultimately benefits our customers' customers."

Pricing for the high-density LIU family ranges from $28.00 to $45.00 each in high-volume OEM quantities. The devices are currently sampling with production quantities available in July. IDT Green and RoHS compliant versions will be available in Q4 of 2005.