how enterprises are solving evolving network challenges with optical lan

8/3/2019 How Enterprises Are Solving Evolving Network Challenges with Optical LAN

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How Enterprises Are Solving Evolving NetworkChallenges with Optical LAN

APPLICATION NOTE

See tellabs.com or more inormation about Tellabs Solutions

Executive Summary

Enterprise businesses that need to upgrade or replace existingtelecommunications networks are looking or ways to improve energyeciency and reduce capital and operating expenses. Technologymanagers are looking or solutions that urnish high bandwidth whileincreasing the security and reliability o their networks.

To meet these requirements, enterprises are turning to GigabitPassive Optical Networks (GPON) Optical LANs. Optical LANsprovide enormous value to enterprises without orcing them to alterhow they do business, while existing services provided by theirnetworks remain the same with no change to core and user devices.

Additionally, enterprises are saving up to 70% o CapEx, 80% onpower requirements and 90% o the rack space while exceedingtheir environmental “green” goals. Plus, businesses deployingOptical LANs experience long-term savings by uture-proong theirnetwork inrastructure while realizing all o the benets o convergingtheir networked services, including Voice over IP (VoIP), with orwithout Power over Ethernet (PoE).

This application note explains how Optical LANs work and how theycan benet your organization. It also highlights why enterpriseslooking to deploy Optical LANs are turning to Tellabs. Tellabs oers aull line o Optical LAN solutions that are environmentally responsible

and solve evolving network challenges while signicantly cutting

CapEx and OpEx, power consumption and space requirements.

Optical LAN vs. Traditional Active Ethernet LAN

An Optical LAN is a Layer-2 transport medium, built with PassiveOptical Network (PON) technology, that provides converged video,data and voice services at gigabit speeds over a single strand o berto the user’s location. Comparing the congurations o a TraditionalActive Ethernet LAN and a GPON architecture helps to illustratemore clearly the similarities between the two technologies (Figure 1)

In a Traditional Active Ethernet LAN, a router in the top-most layer(Core Layer) links to the campus or building aggregation switches(Distribution Layer) below. The distribution switches connect downto the Access Layer switches in the communications closets. Copper

cables extend rom the communications closets to the users.

In an Optical LAN solution, the router is retained in the top-mostlayer and the Optical Line Terminal (OLT) serves the same purposeas the campus aggregation switches. The building aggregationswitching is accomplished by the 1x32 optical splitter, which is apassive device so there are no power requirements. Optical NetworkTerminals (ONTs) provide connectivity to the users.

It is important to note that both solutions provide data access via1000Base-T Ethernet connections to the user. Thereore, no clientor PC reconguration is required when upgrading rom active-Ethernet to a GPON inrastructure.

Campus Aggregation

Building Aggregation

Communication Closet

Passive

Network

Tellabs OLT

Tellabs ONT

Traditional Active Ethernet LAN Optical LAN Solution

User

PON

Splitter

Figure 1. Comparing Traditional Active Ethernet LAN and Optical LAN network architectures



2 HOW ENTERPRISES ARE SOLVING EVOLVING NETWORK CHALLENGES WITH OPTICAL LAN


Enterprises also have the fexibility to deploy an Optical LANin a Fiber-to-the-Desktop (FTTD) topology or a Fiber-to-the-Communications (FTTC) room. A splitter-equipped ber distributionhub (FDH) on each foor routes the ber to the desktop ONTs

throughout the building. The FTTC closet topology allows or thereuse o existing copper cables between the Communicationsclosets and the desks.

An Optical LAN’s ONT has all o the required Layer-2 unctionalitybuilt in. The Optical LAN provides integrated Ethernet bridging,VLAN capability required or network segmentation and userauthentication and security ltering. The ONT, which unctions

much like an Ethernet switch, makes it possible or an enterprise toseamlessly replace an Ethernet-switched LAN.

Deliver Signicant CapEx and OpEx Savings

When upgrading your network inrastructure, it is important to look

at both the near-term and long-term expenses. Today’s enterpriserequires solutions that not only lower initial capital expenses, butalso reduce the total cost o ownership (TCO) or the network.Forward-looking managers insist that new systems address more otheir telecommunications requirements while minimizing ongoingoperational expenses.

GPON technology enables the enterprise to signicantly reducethe cabling inrastructure costs rom the data center to the userby signicantly reducing the number o cable runs. The result is adecrease in overall operational costs and network complexity.

Each ONT model supports multiple densities o Gigabit Ethernet,ast Ethernet, POTS and RF video. This integrated approach

provides the ability to connect building automation systems, security

cameras and building sensors all on the same inrastructure,thereby removing the requirement and expense o separatetransport systems across the campus or each technology. The PON

inrastructure also eliminates costly hardware within a network, suchas remote switches, as well as their associated provisioning cost,annual maintenance and sotware licensing ees.

An Optical LAN extends the network liecycle to 10 years or more.This approach enables:

n Gradual, more predictable costs or bandwidth upgrades overthe ull 10-year period

n Modest ongoing maintenance costs associated with ber

n Seamless addition o more technology-based capabilities, suchas wave-division multiplexing 40- and 100-Gbps transport and

terabyte switching

Developed or low-cost ber-based converged network servicedelivery, GPON standards were nalized by the ITU in 2003 (ITUG984.x). Tellabs rst publicly demonstrated standards-based GPONOLTs and ONTs to the North American service provider consortiumled by Verizon, AT&T and BellSouth in May 2006. Today, thegrowing market acceptance refects GPON’s ability to support criticaenterprise applications with greater eciency than Active Ethernet.Figure 2 shows an overview o the connectivity and bandwidthconguration o a typical GPON connection.

GPON attains up to 95% bandwidth utilization eciency, whereActive Ethernet suers rom eciency as low as 69%. Coupled withstrong encryption support, GPON delivers the most ecient and

secure technology available.

Figure 2. Connectivity and bandwidth conguration o a typical GPON connection

OpticalSplitter

Optical NetworkTerminals (ONT)

Optical LineTerminal (OLT)

1490nm

1310nm

1G or 10GNetworkUplinks

30km





Typically, the cable plant is the most expensive part o a technologyupgrade. Installing SMF removes the requirement or additionalupgrades to your cable plant in the oreseeable uture. Additionally,recent advances in ber connector technology have reduced the

cost o installing ber signicantly and in most cases the installationo ber is now less labor intensive than installation o a copper cableplant.

Finally, in a direct comparison to CATx copper cable plant, SMFis smaller, lighter, and stronger; has a tighter bend radius, higherbandwidth capacity, and longer reach; is less susceptible to EMIintererence; has aster connector solutions and longer lie; and

entails less material expense than CATx.

Converge All Services

Converging all network services is the oremost eature o theOptical LAN. It will converge all services into a single Optical LAN,

eliminating the need or multiple platorms while providing highlyscalable high-speed data services to all users. Additionally, voice(analog POTS and VoIP w/PoE), video, video conerencing servicesand monitoring services (such as building automation systemsecurity cameras and building sensors) are all supported on theOptical LAN.

About Tellabs® Optical LAN

Tellabs is the leading North American PON vendor with more than3,000+ OLTs deployed in the United States and is dedicated tohelping our customers succeed by providing enterprise businesseswith next-generation Optical LAN solutions. Tellabs® Optical LANprovides highly secure networks, combined with carrier-classreliability o 99.999%. Additionally, Tellabs Optical LAN will greatly

improve the energy eciency o your enterprise network and reduceHVAC requirements.

Businesses using Tellabs Optical LAN have reduced capital andoperating expenses signicantly. Tellabs Optical LAN has beenproven to provide savings o up to 70% on CapEx, 80% o space,and 90% o power, resulting in the lowest TCO in the LAN.

Tellabs Optical LAN also helps you meet tangible environmentalgoals through LEED certication and Energy Star qualication.LEED is the internationally recognized green building certication.Corporations seeking LEED certication or new construction orexisting buildings will receive maximum operational eciency withthe Tellabs Optical LAN. Reduced power and HVAC requirements

reduce the environmental impacts o new and upgraded networksystems.

Energy Star is an international standard or energy-ecientconsumer products that originated in the United States. Tellabsis a major contributor to Energy Star, establishing criteria or PONequipment. Energy Star certication is pending or the TellabsOptical LAN solution.

Lower Space Requirements

Cutting back on foor, rack and closet space is also extremelyimportant to organizations looking to save. Reduction in foor space

lowers operating expenses by reducing overhead costs, such asspace and HVAC. In addition, the smaller ootprint associatedwith GPON technology enables next-generation perormance andservices in smaller communication closets not originally designedor advanced communications equipment.

A typical Active Ethernet LAN serving up to 2,016 users requires90 rack units o space. Active Ethernet LAN switches require oneull rack or the switches and two additional racks or terminatingthe large bundles o copper cables associated with the switches.The total solution would require a total o 18 seven-oot-tallequipment racks.

Comparatively, an Optical LAN serves up to 7,700 users. Due to theOLT’s 90% greater density, this solution requires only 1 equipmentrack and a total o 9 rack units within the rack.

Additionally, an Optical LAN requires ewer communications closetsand, in some cases, eliminates them altogether. As a result, abusiness may recover physical space and cut expenses. The single-mode ber in the Optical LAN, however, can reach up to30 kilometers. This enables an enterprise to:

n Reduce or eliminate repeaters, switchesand communications closets

n Deploy an OLT in a single, central location

Meet Green Objectives

Optical LAN oers power savings o up to 80% over Active Ethernetsolutions supporting green initiatives and reducing total cost oownership. GPON is a passive architecture, thereore it requires nopower within the Optical Distribution Network (ODN), which removesall power requirements rom the building aggregation portion o thenetwork. Not only does less equipment require less power, it has aripple eect on many other areas, including power distribution andswitchgear, power conversion and cooling. One in ve companiesnow has a dedicated budget allocated or green IT initiatives, and44 percent say they are moving toward doing so.

Deploy a Future-Proo Inrastructure

Installing a Single Mode Fiber (SMF) inrastructure virtually uture-proos your network. Since SMF has been demonstrated to carry69 Tbps o ull duplex bandwidth, the next-generation networkupgrade will not impact the installed ber distribution network,and you will only need to upgrade the electronics. UtilizingSMF extends the LAN reach out to 30 kilometers without signalregeneration.





Smooth Upgrade Path to Next-Generation Services

Tellabs Optical LAN supports legacy voice, including SessionInitiation Protocol (SIP); video, including IPTV and RF over Glass(RFoG); high-speed data; and business services. The ITU createdthe GPON standard with the ability to support multiple services, andTellabs Optical LAN takes advantage o this capability by providing asmooth upgrade path rom existing to next-generation services. TheGPON network easily scales as the campus network expands andevolves, providing a simple and cost-eective migration path.

To understand how it works, see Figure 3. Figure 3 is a networkdiagram o a typical VoIP installation. On the let is the Router, VoiceGateway and either an IP-enabled PBX or a Sot-switch. The networkis then connected to the Tellabs OLT in the center (Distribution Area)o the network. A PON port on the OLT is then connected to thesplitter that eeds a series o ONTs in either the closet or work area.The Ethernet ports on the ONTs are then connected to either a PC

or VoIP telephone instrument. Enterprises also have the option toconnect POTS analog telephone sets to selected ONT ports.

Improve Security and Reliability

Tellabs Optical LAN is highly secure and produces no EMI radiationthat is typically associated with traditional copper-wired acilities.Utilizing ber optic cable or the transport mechanism eectivelyremoves all TEMPEST concerns. In addition, Tellabs Optical LANprovides powerul security measures at the physical layer, data layerand at the user port to greatly reduce the potential or Denial oService (DoS), redirects or other malicious attacks.

Tellabs Optical LAN provides Access Control Lists (ACLs),Broadcast Datagram Rate Limiting at each user device and strongauthentication. Authentication based on 802.1x allows multipledevices per user port along with advanced intrusion detection— eectively locking down the physical port upon detection oan untrusted device. ACLs provide fexibility to statically and/ordynamically permit/deny datagrams based on Layer 2 (Ethernet)rules, Layer 3 (IP) rules, Layer 4 (TCP/UDP) rules and NetworkAccess Control (NAC).

Figure 3. Network diagram o a typical VoIP installation

Voice-over-IP (VoIP)

Converged Services NetworkNetwork Is Enabled for Soft-Switch Migration

Access AreaDistribution Area

TellabsMulti-Desk

Unit

VoIP

Tellabs ® 1100 OLT

Network Core/Data Center

L3 Router

Tellabs Voice Gateway

GR-303TR-08

TransportAggregation

Network

GE

GE

POTS

POTS

VoIP

PBX orSoft-Switch

TellabsDesktop Unit

Integrated Voice Services on Tellabs Voice GatewaySupport for POTS or VoIP

ToNetwork

Core




North America

Tellabs1415 West Diehl RoadNaperville, IL 60563U.S.A.+1 630 798 8800Fax: +1 630 798 2000

Asia Pacifc

Tellabs3 Anson Road#14–01 Springleaf TowerSingapore 079909

Republic o Singapore

+65 6215 6411

Fax: +65 6215 6422

Europe, Middle East & Arica

TellabsAbbey Place24–28 Easton StreetHigh Wycombe, BucksHP11 1NTUnited Kingdom+44 871 574 7000Fax: +44 871 574 7151

Latin America & Caribbean

TellabsRua James Joule No. 92EDIFÍCIO PLAZA ISão Paulo – SP04576-080Brasil+55 11 3572 6200Fax: +55 11 3572 6225

The ollowing trademarks and service marks are owned by Tellabs Operations, Inc., or its aliates in the United States and/or in other countries: TELLABS ®, TELLABS and T symbol®, and T symbol®. Statements herein may contain projections or otherorward-looking statements regarding uture events, products, eatures, technology and resulting commercial or technological benets and advantages. These statements are or discussion purposes only, are subject to change and are not to be construedas instructions, product specications, guarantees or warranties. Actual results may dier materially. The inormation contained herein is not a commitment, promise or legal obligation to deliver any material, code, eature or unctionality. It is intended tooutline Tellabs’ general product direction. The development, release and timing o any material, code, eature or unctionality described herein remains at Tellabs’ sole discretion.

© 2011 Tellabs. All rights reserved. 74.2428E Rev. A 11/11

Seamlessly Upgrade to VoIP

Typically, upgrading to VoIP requires not only the installation o asot-switch, but also the upgrade o each user’s handset to a VoIP

phone, which can cost $300 to $700 per set. It is estimated that in anormal oce environment only 5% to 20% o users actually requireadvanced VoIP eatures. Tellabs Optical LAN enables the enterpriseto continue using the existing analog handsets or users that do notrequire the advanced VoIP eatures, eliminating the need or costlyhandset upgrades.

Time-Saving Tellabs Optical LAN Training

Getting an Optical LAN up and running is easy with Tellabs training,which is available either at the Tellabs training acility or at yourlocation. The amount o training required to Test and Turn-up theTellabs Optical LAN is ar less than with an Active Ethernet network.Simplied training is possible due to the central management o theEMS system combined with the central intelligence provided by theOLT, which simplies and reduces the amount o training required tosupport an Optical LAN network. The Tellabs Test and Turn-up classincludes the Optical LAN and EMS system and is only 3½ days long,compared to the several weeks o training that is typically requiredor an Active Ethernet network.

Summary

Enterprises looking to upgrade or replace their networkinrastructure are realizing the value o Optical LAN. Optical LAN

provides signicant benets without orcing enterprises to alterwhat they are already doing or changing out the core and userdevices. Businesses are saving up to 70% o CapEx, 80% on powerrequirements and 90% o the rack space while exceeding greengoals and gaining assistance in acquiring LEED acility certication.

Deploying an Optical LAN helps an enterprise uture-proo theirnetwork inrastructure while realizing all o the benets o convergednetwork services. The Tellabs Optical LAN provides solutions thaturnish high bandwidth while increasing the security and reliabilityo existing networks.

Next Step:

Visit www.tellabs.com to learn more about how Tellabs OpticalLAN solutions are solving enterprise network challenges whilesignicantly reducing CapEx and OpEx, power consumption,and space requirements. I you have a question, please email

[email protected].

http://www.tellabs.com/

http://[email protected]/

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http://www.tellabs.com/

how enterprises are solving evolving network challenges with optical lan

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