Optical Internetworking Forum Promotes Multiple Very Short Reach (VSR) Interface Specifications
Source: Optical Internetworking Forum (OIF)
FREMONT, Calif. Industry Forum Continues to Address Cost Effective Solutions for Central Office OC-192/STM-64 Equipment Links
The Optical Internetworking Forum (OIF) today announced the adoption of two Very Short Reach (VSR) OC-192 interface Implementation Agreements.
These VSR interfaces are intended to help reduce the cost of OC-192/STM-64 links between equipment in a single central office (CO). The OIF-VSR-03.0 (VSR-3), titled Very Short Reach (VSR) OC-192 Four Fiber Interface Based on Parallel Optics, utilizes four fibers each way at 2.5 Gb/s on a single 12-fiber Multimode ribbon using 850 nanometer lasers using vertical cavity surface-emitting laser (VCSEL) technology. The OIF-VSR-04.0 (VSR-4), titled Serial Shortwave Very Short Reach (VSR) OC-192 Interface for Multimode Fiber, utilizes a single 850 nanometer VCSEL for the transmitter optical element, and a single PIN PD for the receiver.
"Providing lowest cost interface specifications for different applications has been the focus of the PLL working group," said Adam Dunstan, president of OIF. "The choice of four different specifications reflects the different maturity levels of the technology and the differing needs of carriers."
VSR-3: VSR OC-192 Four Fiber Interface Based on Parallel Optics
The target performance of the four fiber VSR interface is to transmit the OC-192 data over 300 meters of 50 micrometer core multimode ribbon fiber cable. VSR-3 utilizes four 2.5 Gb/s vertical cavity surface emitting lasers (VCSELs) in each direction on a single 12-fiber ribbon (with 4 unused fibers). It has a reach of up to 300 meters. The four fiber solution leverages the low cost parallel fiber VCSEL base technology currently being deployed in many optical backplane applications for digital crossconnect systems, terabit routers and terabit switches.
Four fiber solutions are also being specified in the ANSI Fiber Channel standard and the Infiniband Industrial consortium. These applications and the VSR OC-192 applications have very similar optical power and jitter link budgets. The four fiber VSR OC-192 solution will map the OC-192 frame onto the parallel optical link with no bandwidth expansion and no overwriting of the SONET overhead bytes.
VSR-4: Serial Shortwave VSR OC-192 Interface for Multimode Fiber
The target performance of VSR-4 is to transmit a SONET/SDH OC-192 data stream over 50 micrometer multimode fiber at distances up to 85 meters, or up to 300 meters with 2000 MHz.km high bandwidth multimode fiber. VSR-4 utilizes a single 850 nanometer vertical cavity surface emitting laser (VCSEL) for the transmitter optical element, and a single PIN PD for the receiver. A similar 10Gbs serial 850nm optical interface is under consideration by IEEE 802.3ae for inclusion in the 10 Gigabit Ethernet standard.
About the OIF Physical & Link Layer Working Group
The OIF Physical and Link Layer (PLL) Working Group creates Implementation Agreements (IAs) for critical interfaces between and within optical internetworking equipment. This helps increase interoperability and reduce costs. Last year, the OIF PLL WG created IAs for the interfaces on both sides of OC-192 framers. It recently began work on OC-768 VSR and framer interfaces. Earlier this year the OIF membership voted to approve VSR-1 Very Short Reach (VSR) OC-192 Interface for Parallel Optics and VSR-2 Serial OC-192 1310nm Very Short Reach (VSR) Interfaces.
The OIF Implementation Agreements, including VSR-3 and VSR-4, are available at http://www.oiforum.com/public/technical.html.
About the OIF
Launched in April of 1998, the OIF is a rapidly growing, non-profit organization with 333 member companies to date, including many of the world s leading carriers and vendors. As the only industry group uniting representatives from packet and voice networks, the OIF helps advance the standards and methods of optical networks. OIF s purpose is to accelerate the deployment of interoperable, cost-effective and robust optical internetworks and their associated technologies. Optical internetworks are data networks composed of routers and data switches interconnected by optical networking elements.
With the goal of promoting worldwide compatibility of optical internetworking products, the OIF actively supports and extends the work of national and international standards bodies. Formal liaisons have been established with The ATM Forum, IEEE 802.3 HSSG and the IETF. More information on the OIF can be found at www.oiforum.com.
CONTACT: Porchivina and Associates Kendra Gross, 415/893-9138, kendra@papr.com
Porchivina and Associates
Kendra Gross, 415/893-9138, kendra@papr.com
E-mail: kendra@papr.com
Web site: http://www.oiforum.com
