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Fast Ethernet and Gigabit Ethernet Fiber-optic Interfaces Fiber MMF MMF MMF SMF Type Serial Serial Serial Serial Freq 1310 nm 850 nm 1310 nm 1310 nm Reach 2 km 2 220 m 2 550 m 5 10 km Applications Data center Intraoffice cabling, data center Intraoffice cabling, data center Data center, campus LAN
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100 Base-FX2 1000 Base-SX 1000 Base-LX 1000 Base-LX
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CWDM systems require opto-electronic conversion in order to interface with larger metro/regional DWDM networks, ie, signal relaunch on DWDM This technology is best suited for smaller isolated networks with simple point-to-point or static OADM setups such as low-cost interconnection routers/switches in large campus settings
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Another crucial area that has seen much progress is Ethernet interface designs Here, the most remarkable outcome has been Ethernet s continual ability to adapt and expand over multiple physical media dependent (PMD) sublayers Most notably, optical Ethernet interfaces have played a vital role in propelling the technology into a converged LAN-MAN-WAN solution Current standards support a full range of speeds 10 Mbps 10 Gbps and retain crucial interoperability with a vast installed Ethernet base (the interfaces are summarized in Tables 8-3 and 8-4) More importantly, the recent specification of SMF- and DWDM-based interfaces has paved the way for genuine interoperability across DWDM optical networks
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10 Gigabit Ethernet Fiber-optic Interfaces Fiber MMF MMF MMF SMF SMF SMF SMF MMF SMF Type Serial Serial, OC-192c Serial Serial Serial, OC-192c Serial Serial, OC-192c Parallel Parallel Frequency 850 nm 850 nm 850 nm 1310 nm 1310 nm 1550 nm 1550 nm 1310 nm 1310 nm Reach 26 300 m 26 300 m 300 m 2 10 km 2 10 km 2 40 km 2 40 km 30 300 m 240 m 10 km Applications Campus, data center Campus, data center Campus, data center Metro, storage networks Metro, storage networks Metro, storage networks Metro, storage networks LAN, data center LAN, data center, metro
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10G Base-SR 10G Base-SW 10G Base-LRM 10G Base-LR 10G Base-LW 10G Base-ER 10G Base-EW 10G Base-LX4 10G Base-LX4 Nomenclature 10 G-Base xyz
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x- S (short, 850 nm) y - R (LAN serial) z - # channels L (long, 1310 nm) W (WAN, OC-192c) E (extra long, 1550 nm) X (LAN)
8
Early Renditions for Fast Ethernet and Gigabit Ethernet The first 10 Mbps fiber-optic Ethernet interface was standardized in 1996 via the ISO/IEC 10 Base-F specification This interface was defined over two MMF spans and supported distances up to 2 km (50 or 625 m core) At about the same time, the IEEE introduced the first Fast Ethernet 100 Base-F standard for MMF by adapting proven transceiver and encoding schemes from Fiber Distributed Data Interface (FDDI) technology Nevertheless, no formal standard has been developed for Fast Ethernet over SMF, although many vendors have proprietary solutions on the market (1310/1550 nm, 10 100 km reach) Ethernet s entry into the gigabit-fiber realm came in 1998 with the approval of the IEEE 8023z 1000 Base-F standard This interface preserved the minimum/maximum Ethernet frame sizes and used 8b/10b encoding Again, the interface leveraged transceiver design and 8b/10b encoding formats from existing 10 Gbps Fibre Channel technology The only difference was a slightly higher clocking rate to support full gigabit data transfers (ie, 125 Gbps versus 106 Gbps) Specifically, two interface types were defined Namely, the 1000 Base-SX standard was targeted for intra-building/data-center MMF cabling (550 m reach), whereas the 1000 Base-LX standard was targeted for larger campus networks (MMF and 1310 nm SMF) with a range of 10 km (see Table 83) These were also the first Ethernet interfaces to use laser optics with associated low-loss frequencies of 850 nm (MMF) and 1310 nm (SMF) In addition, mode condition path (MCP) solutions were developed to overcome modal dispersion effects over MMF, yielding improved reach up to 2 3 km Nevertheless, all official Gigabit Ethernet fiber interfaces were restricted to campus/enterprise applications such as aggregating Fast Ethernet ports To resolve this limitation, many vendors have developed proprietary SMF interfaces with extended reach up to 150 km 10 Gigabit Ethernet Work on the 10 Gbps Ethernet interface started in late 1990s and was driven by improvements in high-speed electronics and lasers A major goal of this effort was to scale to ten times the aggregation of Gigabit Ethernet for a small multiple of its price (two to three times) Another aim was to project Ethernet well out of the LAN as a genuine carrier-grade solution, ie, LAN-MAN-WAN convergence The first 10 Gigabit Ethernet specifications (IEEE 8023ae) emerged in 2002 and defined full-duplex operation without carrier-sensing multiple-access with collision detection (CSMA/CD) operation However, Ethernet frame formats were maintained to ensure interoperability and protect existing investments Given many potential applications, 10 Gigabit Ethernet interfaces support a wide range of distances and fiber types, as detailed in Table 84 In particular, the standards define two physical interface layers, one for LAN and the other for MAN/WAN The former supports full 10 Gbps bit rates (103 Gbps clock rate) and runs over SMF (1300 nm) or DWDM (1550 nm) Meanwhile, the latter defines a new WAN interface sublayer (WIS), ie, WAN PHY, which is based on a simplified concatenated SONET STS-192c/ SDH-4-64c frame with a 958464 Gbps data rate (10G-Base-SW/LW/EW) [6] This facilitates seamless interconnection across extensive SONET/SDH infrastructures such as add-drop multiplexer (ADM) rings, DCS meshes, DWDM networks, regenerators, and so on In order to reduce cost, however, full SONET functionality is not supported in
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