Ethernet-over-SONET/SDH Mappers Deliver New Ethernet Services

They are the industry's first monolithic SONET/SDH mapping ICs to support the Ethernet-over-PDH (EoPDH) protocol over optical networks. The DS33M31 and DS33M33 both have a 17mm x 17mm footprint, with the DS33M33 including three additional DS3/E3 add/drop interfaces. The DS33M30 lacks the DS3/E3 functionality, but is the industry's smallest EoS mapper at a mere 10mm x 10mm. All three devices require only a minimal number of external components to implement a complete Gigabit Ethernet to OC-3/STM-1 solution, and provide an ideal solution for Ethernet access equipment, multiservice provisioning platforms, microwave radios, and IP DSLAM uplinks.

The DS33M31/DS33M33 perform EoPDH mapping of Ethernet frames from a Gigabit Ethernet interface into a DS3/E3 frame format, then use traditional SONET/SDH mapping techniques to place the DS3/E3 tributaries into an optical OC-3/STM-1. This merger of new and old protocols results in a technology known as Ethernet-over-PDH-over-SONET/SDH (EoPoS). When EoPoS technology is used, the optical transport network can manage a link as if it carried traditional PDH traffic. This results in the reuse of optical network equipment, provisioning systems, monitoring systems, and test equipment.

The DS33M31/DS33M33 support not only EoPoS mapping, but also the more traditional EoS mapping in virtually concatenated high-order containers, as does the DS33M30. The supported frame encapsulations include GFP-F, HDLC, cHDLC, and X.86 (LAPS). These mappers have Ethernet OAM insert/extract capability, QoS priority scheduling, VLAN processing, and CIR policers for the delivery of variable-rate Carrier Ethernet services. They also have a 1000Mbps GMII Ethernet port, an Ethernet MAC, dual protected STS-3/STM-1 SerDes ports with LVDS/LVPECL interfaces, a GFP-F/HDLC/cHDLC/X.86 protocol encapsulator, a SONET/SDH mapper, a DDR SDRAM interface, and a local bus port for host control. The SerDes interfaces can be seamlessly connected to commercially available optical transceivers.

The DS33M30 is available in a 10mm x 10mm, 144-pin CSBGA package and the DS33M31/DS33M33 are available in a 17mm x 17mm, 256-pin CSBGA package, all specified over the -40 degrees Celsius to +85 degrees Celsius extended-industrial temperature range. Prices start at $55.77 for the DS33M30, $65.25 for the DS33M31, and $72.50 for the DS33M33 (5000-up, FOB USA). Design kits and software drivers are available to reduce design time.