Tài liệu Media Conversion Myths about Media Converters pptx

Media converters are a tactical element that facilitate the fiber network evolution.. Likewise, there are media converters for most types of networks: Ethernet, Fast Ethernet, Gigabit Et

Based on growing bandwidth and service demands, the ideal network would

be founded on an all fiber cable infrastructure The expensive electronics located along this high-speed network would be equipped with fiber interfaces to take advantage of the medium’s bandwidth, resistance to EMI, better security, and freedom from confining distance limitations

That’s probably not your current network, however The day may come when fiber is strung end-to-end and all your networking gear is equipped with fiber interfaces, but the copper-to-fiber transition is truly an evolutionary process that won’t come all at once It’s simply too expensive to abruptly replace all the copper and all the old equipment—just because some parts of the network require fiber Planned migration is a better and more practical idea, using your current copper infrastructure to maximize profits, while selectively deploying fiber and fiber gear as needs arise and funds are available

Media converters are a tactical element that facilitate the fiber network evolution Deploying media converters makes it possible to connect networks that use dissimilar cabling They are physical-layer devices that straddle two types of media In their most common application, they receive electrical signals

on one port and transmit optical signals out the other Most often this involves unshielded twisted pair (UTP) and fiber, although there are media converters for almost every type of cabling: twisted pair, coaxial, multimode and singlemode fiber Likewise, there are media converters for most types of networks: Ethernet, Fast Ethernet, Gigabit Ethernet, ATM, T1/E1, Fibre Channel, and SONET There are many preconceived notions and beliefs about media converters and

their usefulness Myths about Media Converters will address the value they

provide

Media Conversion

Myths about Media Converters

The Myths…

Media converters don’t belong in my

network…

Media conversion is prolific in every fiber network Once

you add fiber to your network, media conversion is

inevitable The real question is where should the media

conversion occur The switches, router and multiplexers

that populate the network produce electrical signals that

need to be converted before they can be transmitted on

fiber optic cabling Media conversion can take place on the

network element, optical line card or blade within the

device or by an external media converter So which

method offers the best value? The answer depends on the

current network infrastructure, capital budget, anticipated

network growth, deployment scale and maintenance

strategy Often the most economical solution is the

external media converters

Media converters add cost to my network…

Media converters can save you money It’s not uncommon

for network equipment with fiber interfaces to cost more

than three times as much as similar gear with copper

interfaces One network equipment manufacturer, for

example, charges six times as much for a fiber gigabit

network interface card (NIC) as for a copper one Similar

markups are common for fiber switches and routers, too

The optical component costs in reduced volumes drive a

majority of the cost increases With media converters, you

can hang on to the copper equipment and still get the

benefits of deploying fiber Additionally, optical line cards

also reduce the port density within a network element

Therefore the high-density solutions touted by equipment

vendors are lost when optical interfaces are deployed

Often not all of the interfaces require optics for distance

concerns The required optical extensions may vary from

500 meter to 40 km These requirements drive differing

optical components Optical line cards or blades nail up a

set of circuits in a specific configuration, potentially

stranding capacity Media converters allow you to manage

the diversity of the network and save capital costs

Media converters are non-standards compliant

elements…

Media converters comply with IEEE802.3 physical layer

standards This means that the media converter will work

with compliant equipment, including hubs, switches,

routers, and other media converters from any

manufacturer

The benefit of external media converters is the flexibility

to add functionality to the network as standards evolve,

as well as flexibility in the speed and scope of

implementation Equipment manufacturers will migrate

to these emerging standards at different rates External

media converters can provide a faster evolutionary

migration path because of their focus For instance, the

IEEE 80.3ah™ Ethernet in the First Mile standard has just been released Within the standard, a new Operation, Administration and Maintenance sublayer has be been defined to support loopback functionality and performance management data All major media converter vendors have announced implementation plans

or products, while network equipment vendors are delaying their decisions This new functionality will enable network engineers to more proactively monitor their network performance and ultimately reduce operational expenses External media converters are the only current pathway for this solution

Types of Media Converters

Media converters can be categorized into the following groups, all of which provide standards-compliant media transitions and are likely to be equipped with LEDs that provide power and status information:

• Workstation units

• Unintelligent data center units

• Intelligent data center units The distinction between workstation and data center models is the number of transitions supported Workstation models, which are commonly used to affordably bring fiber to the desk top, provide transitions for a single pair of cables Data center models provide conversion for multiple cable pairs Robust management capability is the key difference between intelligent and unintelligent data center models Intelligent models provide significant management features, such as those described earlier An attribute more commonly found in intelligent models is modularity These devices support line card diversity within the same modular chassis, which makes them highly scalable They allow you to add conversion line cards of different types as required

Media converters add a point-of-failure in my

network and are not reliable…

Introducing any new device, active or passive, in the

network creates a new potential point-of-failure The

critical question is how reliable is the new element and

can it be managed or monitored Media conversion is a

mature, well-tested technology, having proven its

reliability for over a decade in millions of installations The

introduction of managed multi-port systems provides

intelligence to the media conversion solution The

platforms offer remote management and monitoring

tools via SNMP, RMON, TL1, and Telnet The network

engineer is no longer blind to the operation of the media

converter device and can integrate its management into

the network-wide support system

Media converters clutter up the workstation…

Traditional workstation media converter can create a

cable mess at the desktop Often, fiber interfaces at the

wall plate require fiber optic cable to lie on the floor

where it can be stepped on or rolled over by a chair The

converter may be inadvertently kicked or damaged

These devices are not ideal in any environment The best

solution is to have the media conversion take place

behind the wall plate where the optical interfaces and

cabling can be protected Only the copper Ethernet,

which connects to the PC, is exposed This media

conversion solution is available today and protects the

optical infrastructure better then a stand-alone unit or

fiber NIC

There are no applications for media converters

in my network…

Media converters can be deployed in multiple applications whenever the network employs mixed media Let's look at the most common applications

Fiber to the Desktop (FTTD)

Gigabit Ethernet to the desktop is a reality Fiber to the desktop is no longer deployed simply to support the bandwidth-hungry applications of the future It’s required now, to meet current challenges For example, fiber can be required because the distance between the switch and the desktop is too great for copper cabling or because the cable has to be routed through areas with high EMI levels There are two options in these cases; each requires you to lay new fiber, but that’s where the similarities end You can start over by replacing the copper switch and NICs with pricey fiber optic gear Or you can keep the existing infrastructure and augment it with a more cost-effective solution utilizing media converters to provide the transitions between UTP and fiber This is particularly true if only some connections are too distant for copper or deployed in areas of high EMI

MAINFRAME COMPUTER CONTROLLER PBX

FIBER

Media Conver ters

Media Converte r

COPPER

FIBER MDF

COPPER MDF

SERVER FARM

ENTRANCE CABINET

WORKGROUP HUB

FIBER CABLE

CAT 5+

CABLE

MULTIMEDIA OUTLET

PATCH CORD

Media Converter

FTTD with media converters

Intra-Office and Inter-Office Extensions

Connecting legacy electronics positioned greater than

100 meters apart is a prime application for the use of

cost-effective media converters to achieve the benefits of

fiber and extend the life of existing capital investments

These optical extension can be within a single office,

spanning multiple floors or from one office location to another The ability to deploy multimode and singlemode fiber solutions with the same platform provides flexibility

in extending signal a variety of distances The alternative

to this configuration is to replace the Ethernet switches with much more expensive optic models

Network Element A RJ45 Patch Panel

Network Element B Ethernet Distribution Frame

RJ45 Patch Panel

Media Converter Fiber Panel

Media Converter

Router

Ethernet Switch

Intra-Office Optical Ethernet Extensions

Media Converter

Media Converter

Media Converter

Media Converter

Media Converter

MC Switch PBX

OSP Access Product

WA TC

WA TC

WA TC

WA TC

WA TC

WA TC

WA TC

WA TC

WA TC

Campus B

Campus C

MC – Main Cross-Connect

IC – Intermediate Cross-Connect

WA – Work Area

Main Building

Sports Complex

Library

Housing Complex

Student Union

Administration Building

Lecture Hall

WA TC

WA TC

WA TC

WA TC

WA TC

WA TC

Media Converter

Media Converter

Campus Area Network

The distance spanned by a campus area network is likely

to exceed the limitations of copper-based Ethernet

Serving multiple locations from a centrally managed site

often requires multiple point-to-point Ethernet

extensions Fiber media converters at one or both ends are an ideal, cost-effective solution which preserves the investment in legacy infrastructure

High Rise Apartment Buildings

In a high-rise apartment, Ethernet services are typically

delivered to the basement of the building through an

ADM, switch or router Some of the customer hand-offs

may be in the basement while other are required to be in

the end user’s telecom closet Media converters can extend the Ethernet signals up the riser to the customer’s demarcation point New standards within the Ethernet domain now allow one to manage the customer demarcation

Singlemode Fiber Singlemode Fiber

Ethernet Switch Media

Converter

Carrier Services

End-User Media

Converter

End-User Media

Converter

End-User Media

Converter

High-Rise Apartment Application

ADC Media Conversion Solutions

Work Area Solution

ADC’s solution for work area media conversion supports

10Base-T and TX UTP and 10Base-FX,

100Base-SX, and 100Base-FX multimode fiber with auto

negotiation It is an uncluttered and cost-effective

solution, consisting of two simple components:

• An integrated media converter with conversion

circuitry behind the faceplate Tx and Rx fiber cables

connect on the rear of the media converter – behind

the faceplate and protected from the office

environment Each single port media converter fits

into any ADC 6000 multimedia outlet with a 2-port

opening

• Local power supply through a compact power

adapter that mounts behind the PC or on the desk,

obtaining power through a standard PS/2 mouse

interface with a RJ45 patch cord The media converter

can also be powered through the USB port of the PC

by means of a simple patch cord or through a

conventional AC/DC wall outlet power adapter

OptEnet™ Optical Extension Platform

The ADC OptEnet media converter platform is a

carrier-class, intelligent, scalable platform capable of handling

any network’s Ethernet or SONET media transitions

Integrated intelligence allows you to remotely monitor

system performance and transmit alarm conditions to

upstream operational support systems A variety of

solutions are supported ranging from 10Mb/s Ethernet,

OC-12 and Gigabit Ethernet

Key OptEnet features include:

• Modular design enables line card diversity within the same chassis

• Auto-negotiation eliminates the need for optical line card upgrade in network elements

• Redundant -48Vdc and AC power supplies

• SNMP, TLI and Telnet support

• Daisy-chain communication interfaces

• 10Base-T, 100Base-TX and 1000Base-T UTP conversion to singlemode fiber

• Multimode to singlemode fiber conversions

• Medium Dependent Interface Cross-over (MDI-X), which eliminates network collisions

• NEBS Level 3, UL and FCC standards compliant

Summary

Fiber cabling isn’t an all or nothing proposition With media converters there is a cost-effective, standards-compliant, highly-reliable alternative that allows you to deploy fiber where it’s required while maximizing your investment in the existing copper infrastructure

OptEnet Optical Extension Platform

Work Area Media Conversion

ADC Telecommunications, Inc., P.O Box 1101, Minneapolis, Minnesota USA 55440-1101 Specifications published here are current as of the date of publication of this document Because we are continuously improving our products, ADC reserves the right to change specifications without prior notice At any time, you may verify product specifications by contacting our headquarters office in Minneapolis ADC Telecommunications, Inc views its patent portfolio as an important corporate asset and vigorously enforces its patents Products or features contained herein may be covered by one or more U.S or foreign patents An Equal Opportunity Employer

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