PMC-Sierra Rolls Out Single-Chip Add/Drop Multiplexer Devices

6/15/2004 - PMC-Sierra (Nasdaq:PMCS - News) introduced the PM5337 ADM 622 and PM5338 ADM 622 PDH optical access devices for use in remotely deployed SONET/SDH Add/Drop Multiplexers (ADMs) and Terminal Multiplexers. The highly integrated ADM 622 devices enable system designers to build robust, small footprint carrier-class equipment which extends legacy and next-generation services to small and mid-sized enterprises. As a result, networking OEMs can achieve a faster return on investment and meet time-to-market demands.

"The PMC-Sierra ADM 622 targets the access and metro-edge markets which will be the highest growth segments in the telecommunications carrier space over the next five years," said Steve Rago, principal analyst, networking and optical communications for iSuppli Corporation. "Telecommunications carriers are seeking value-added services they can offer to enterprises such as Ethernet Virtual LANs (VLANs). PMC-Sierra's ADM 622 supports such services. As market demand for Ethernet and PDH traffic grows, cost-effective switching of T1/E1 and virtually concatenated GFP traffic at VT/TU levels is critical for service providers."

"By integrating all the features necessary to build a complete ADM or Terminal Multiplexer in a single device, PMC-Sierra continues to drive down the cost of developing and deploying carrier-class equipment," said Greg Aasen, vice president and general manager, Service Provider Division at PMC-Sierra. "The ADM 622 product family facilitates the deployment of traditional PDH and new services like Ethernet while maintaining the standards of availability and reliability required by carriers."

Advanced Features for Optical Networking Equipment
The ADM 622 devices are the industry's first single-chip ADMs to be cost-optimized for OC-3/STM-1 and OC-12/STM-4 applications. The ADM 622 devices' advanced feature set and high integration are ideal for compact optical networking equipment deployed in remote terminals or customer premises equipment where service density does not justify deployment of larger, more expensive MSPPs (see Figure 2). In addition, the industry standard Scalable Bandwidth Interconnect Transport (SBI(TM) TR) bus connects directly to PMC-Sierra's PM4329 HDLIU 32 device and PDH client interfaces. Both the ADM 622 and ADM 622 PDH devices integrate SONET/SDH framers and pointer processors, PDH mappers, expansion interfaces, and a cross-connect; the ADM 622 device also integrates Ethernet-over-SONET/SDH interfaces with Layer 2 processing (see Figure 3). The combination of these key features enable optical equipment OEMs to provide the important features carriers are looking for: reliable transport of client services through the carriers' existing infrastructure, flexible client interface support for current and next-generation services, and scalability.

Reliable Network and Equipment Redundancy Strategies
The ADM 622 devices offer a variety of network and equipment protection strategies to support carriers' diverse redundancy needs. The dual multi-rate OC-3/12 or STM-1/4 network interface integrates support for 1+1 automatic protection switching; in combination with the 2.5G memory based VT/TU/STS/AU cross-connect, the network interface helps to support other network protection schemes, such as UPSR/SNCP, BLSR/MS-SPRING, and 1:n. Additionally, the devices may operate in an equipment protected mode with a mate device which allows full equipment and client interface redundancy. These features provide OEMs the flexibility to offer a single platform that can easily be configured to interoperate with carriers' deployed networks.

Flexible Client Interface Support
The ADM 622 devices support a broad array of client interface signals to support legacy PDH-based services as well as new services based on Ethernet.

Next-Generation Services
The Layer 2 processor in the ADM 622 provides aggregation, grooming, policing, and Ethernet Operations, Administration and Maintenance (OAM) capabilities to enable next-generation services without the need for an external Ethernet switch or network processor. Using the standards-based policing mechanism, carriers may now provide service granularity in 1 Mbit/s increments rather than the 1.5 Mbit/s, 2 Mbit/s, or 51.84 Mbit/s granularity associated with virtual concatenation. The ADM 622 supports Ethernet OAM using a flexible packet insert and extract mechanism enabling Ethernet link monitoring and fault isolation capabilities that are required for carrier grade network access services. In addition, the ADM 622 provides packet grooming and aggregation capabilities which enable virtual private line connections or multiple private line connections from a single Ethernet client interface.

System Expansion and Scalability
The ADM 622 devices provide multiple methods for system expansion and scalability allowing carriers to grow services incrementally without up front costs. Four serial interfaces are provided, each capable of independent operation at 622 Mbit/s or 2488 Mbit/s. This allows additional client interfaces to be added to the system in the future. An 8-bit, 77.76 MHz telecombus interface is also provided which offers system designers additional flexibility.

Pricing, Availability and Customer Support
The PM5337 ADM 622 and PM5338 ADM 622 PDH devices are designed in 0.13 micron CMOS technology and packaged in an 896-ball, 31x31mm Flip Chip Ball Grid Array package. Pricing is available upon request. A comprehensive support product package including datasheets, application notes, device models, reference design, and software is available. Please contact PMC-Sierra applications support for more information at or visit

About PMC-Sierra
PMC-Sierra(TM) is a leading provider of high-speed broadband communications and storage semiconductors and MIPS-based(TM) processors for Enterprise, Access, Metro Optical Transport, Storage Area Networking and Wireless network equipment. The company offers worldwide technical and sales support, including a network of offices throughout North America, Europe and Asia. The company is publicly traded on the NASDAQ Stock Market under the PMCS symbol and is included in the S&P 500 Index. For more information, visit

PMC, PMCS, PMC-Sierra and "Thinking you can build on" are trademarks of PMC-Sierra, Inc.

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