LAN and WAN Rate 10 GigE
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1 LAN and WAN Rate 10 GigE IEEE Sept. 27, 1999 Paul A. Bottorff Nortel Networks 1
2 Agenda A 2 PHYs Solution is the Way To Go LAN PHY compatible with LAN market LAN PHY provides connections up to 40 Km for extended campus networks WAN PHY needs short reach optics WAN PHY does not need a SONET clock 2
3 LAN and WAN Rate Ethernet LAN Rate WAN Rate A G MAC clock allows a single clock for selecting 1 GigE or 10 GigE Users, test labs, and sales people expect the performance metrics for 10 GigE to be exactly 10X 1 Gbps Ethernet LAN a simple management system Allow Ethernet TM multiplexer product to carry exactly 10 1 Gbps signals Carrying 10 GigE over existing WAN networks requires reducing the data rate to fit in the payload capacity of OC-192c/VC-4-64c ( Gbps) Carrying 10 GigE directly over DWDM networks requires matching the transmission technique, timing, and management requirements of the regenerator network Wide area networks demand enhanced management to support unmanned offices 3
4 A Bridge Connects 2 Rates BRIDGE MGMT BRIDGE MAC MGMT MAC MAC MAC MGMT PHY MGMT LAN PHY WAN PHY PHY MGMT PMD MGMT PMD PMD PMD MGMT Gbps LAN Rate Network LRGigE OC-192c/ VC-4-64c ( G) WAN Rate Network WRGigE 4
5 WAN Rate Network 160 IEEE OC-192c/VC-4-64c ( Gbps) WRGigE DWDM Photonic Network 3R 3R 160 IEEE OC-192c/VC-4-64c ( Gbps) WRGigE Signal Regenerators L2/L3 Switch 3R 3R L2/L3 Switch L1 Demarcation Point Transponders L1 Demarcation Point Transponders serve as a demarcation point between the IEEE L1 and the DWDM photonic network Transponders perform mapping to DWDM wavelengths plus signal regeneration and retiming 5
6 LAN/WAN Rate Matching IEEE DWDM IEEE Photonic Network LAN Rate Ethernet 160 IEEE OC-192c/VC-4-64c Rate GigE 160 IEEE OC-192c/VC-4-64c Rate GigE LAN Rate Ethernet L2/L3 Switch Signal Regenerators L2/L3 Switch L2/L3 Switch L2/L3 Switch LAN Rate Ethernet L2/L3 Switch L1 Demarcation Point Transponders L1 Demarcation Point L2/L3 Switch LAN Rate Ethernet LAN Switches de-couple the LAN Rate and WAN Rate PHYs by buffering 6
7 A Single MAC For Both Rates Use a clock rate of Gbps on the MAC/PLS interface MAC pacing mechanism reduces data rate to fit in Gbps OC-192c/VC-4-64c Word-by-word HOLD over XGMII IPG stretch system Highly desirable to send frame length over the XGMII Supports bufferless length/type encode systems 7
8 Have Many MAC Pacing Methods A word-by-word HOLD signal at the MAC/PLS boundary A MAC modification for IPG gap stretching IPG gap stretching based on the Deference signal at the MAC/PLS boundary An IPG HOLD signal at the MAC/PLS boundary An IPG stretching shim located between the MAC and the MAC-Control layers 8
9 WAN Rate Matches OC-192c/VC-4-64c WAN OC-192c/VC-4-64c Rates: Line Transmission Rate: Gbps Synchronous Envelope Rate: Gbps Payload Rate: Gbps To operate in all WAN applications the MAC must pace the data to a rate which will fit in an encoded payload If the encode overhead is zero then the MAC data rate will equal the OC-192c/VC-4-64c payload rate the scrambled encode proposals provide zero overhead byte stuffing used for delimiting in PoS results in a variable MAC rate depending on the data pattern 8b/10b direct on OC-192c results in 25% data rate reduction other encoding systems exist with higher and lower encode efficiencies 9
10 LAN/WAN Rate PMDs Same Many WAN Rate GigE (WRGigE) links are used to connect switching equipment inside the Point-of-Presence (POP) Intra-POP links are typically confined to a single building and frequently connect between racks The applications for these links demand low cost short reach optics Intra-POP fibers carry a single 10 WRGigE signals Access to the DWDM transmission facility is through a transponder/translator Each DWDM wavelength is demultiplexed onto a single 10 WGigE fiber Access between MAN POPs may be carried on dark fibers supporting 10 WRGigE All 10 GigE distances are important for 10 WRGigE including MMF and SMF at 100 m, 300 m, 2 Km, 10 Km, and 40 Km 10 WRGigE links provide single hop transmission between buffered devices 10
11 LAN to WAN Ethernet to DWDM BRIDGE MGMT BRIDGE CARRIER DWDM NETWORK MAC MGMT MAC MAC MAC MGMT PHY MGMT PMD MGMT LAN PHY LAN PMD WAN PHY WAN PMD PHY MGMT PMD MGMT PMD SONET CLOCK SONET OPTICS LAN Ethernet G WAN Ethernet G DWDM WAN Ethernet may use phase locked clock to transmit to DWDM network 11
12 WAN Rate Ethernet < 2 Km Link Link Seg 1 Link Seg 2 Link Seg 3 MAC MAC PHY TRN TRN PHY 4 m Any Distance 40 Km DWDM Network IEEE IEEE TRN = Transponder 12
13 Recommended Objectives Support both LAN and a WAN rate PHYs Same MAC supports LAN and WAN rates Add a pacing mechanism to the MAC Deliver frame length over the XGMII All PMD objectives should be the same for LAN and WAN rates 13
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