VSR1 VSR2 Very Short Reach OC192 Interfaces Russ

VSR-1 & VSR-2: Very Short Reach OC-192 Interfaces Russ Tuck tuck@pluris. com OIF: PLL WG chair Pluris: Systems Architect

Outline Background VSR-1: parallel optics, 300 m, likely lowest cost VSR-2: reduced-cost SR-1, 600 m, SMF Multi-vendor Interoperability Testing

VSR-1 & VSR-2 are OIF IA’s OIF: Optical Internetworking Forum • • 300+ member companies Carriers, Equipment Vendors, & Component Vendors Routing and optical transport vendors IA’s: Implementation Agreements (not standards) PLL: Physical and Link Layer Working Group • VSR: Very Short Reach SONET (POS) Interfaces • • Framer interfaces • • Lower cost OC-192 IA’s are in products now: SFI-4, SPI-4 (phase 1 & 2) Busy with OC-768 UNI: User Network Interface (In Development) • Router to optical transport network

Potential VSR links (in red) DWDM OXC WAN Router Core Router Access Router Host Router/switch Customers Peering partners Internet exchange Web Server

OIF-VSR 4 -01. 0: VSR-1 12 fibers @ 1. 25 Gb/s (Gig. E speed) 850 nm VCSEL lasers 2 multi-mode fiber (MMF) ribbons (Tx, Rx) 300 m with 4 connectors (1 patch panel) Patch Panel VSR IF 62. 5μm core MMF, same as guaranteed for 500 m Gig. E • VSR IF 400 MHz. km modal bandwidth MTP™ (MPO) connectors

Built-in Forward Error Correction (FEC) Data: encoded & striped over 10 fibers Protection: parity (xor) of 10 data fibers Error Detection Channel (EDC): CRC of each fiber Error on any data channel is detected by CRC check. Bad channel’s data block is reconstructed from Protection (parity) channel and good channels If channels are reversed (ribbon flipped), logic detects and compensates automatically. FEC included because easy – probably not needed

OIF-VSR 4 -02. 0: VSR-2 1 fiber at 10 Gb/s 1310 nm edge-emitting FP lasers • Eventually also VCSELs 2 single-mode fibers (SMF) (Tx, Rx) 600 m – dispersion limited, 4 d. B loss budget Based on ITU-T G. 691 • Allows more dispersion than SR-1 • • Shorter reach Easier to manufacture

VSR-1 Transponder Module TX Optics VSRC ASIC MTP™ (MPO) connectors 300 pin Connector 2. 5” 4” RX Optics • Compatible with OIF SFI-4 electrical interface to framer. • Parallel optics are available from multiple suppliers: pin compatible & interoperable. • Field termination kits are being developed for ribbon fiber.

MSA Compatible Mounting Holes 300 pin connector OC-192 VSR OC-192 SR Back side of transponders. • Compatible with 300 -pin MSA modules for 2 -80 km: connector, pinout, size, mounting, etc.

Multiple System Vendor Interoperability VSR-1 testing at the maximum link distance (300 m) Ribbon fiber routed same as SMF 300 meter ribbon fiber spools ~ 28 hour test Zero errors BER < 1 E-16 6 fiber segments CIENA Core Director Cisco GSR router

Multiple System Vendor Interoperability 12 x 1. 25 G VSR Interface was tested at max link length • 300 m over 6 sections of fiber and five connectors Results: • Demonstrated compliance with OIF spec • Optical performance verified • Link protection capability verified • Demonstrated router to switch link with zero errors • ~ 28 hour test, BER < 1 E-16 • Demonstrated multiple vendor system interoperability • Demonstrated multi-component vendor interoperability • parallel optics from multiple vendors

Link Protection Testing Link Protection was demonstrated by breaking individual fibers, simulating single element failures - zero bit errors reported

Selection criteria VSR-1 • < 100 m • • • VSR-2 • Spec: 0 - 300 m Install patch cable Lowest cost interface > 300 m • • • Spec: 0 - 600 m Use existing SMF Most like SR-1