Many companies today are showing a growing interest in the choice of Ethernet applications as part of their network infrastructure. But too often they do not arm themselves with enough information to make an intelligent business decision. Word of warning .... Get smart before.
Ethernet is a multiple access technology, in which the entire bandwidth is available to each user on a contention. T1/DS3 other side is a (time-division) multiplexing technology.Where in the form fractionilized allow users seamless access to their individual time slots 56K/64K.
Now, we can discuss during the intervals of time or group has the full range available, there is one aspect of argument T1/DS3 and affirmation - as well as the allocation of bandwidth to multiple users. Ethernet is this design. But I expect T1/DS3 an additional resource to implement this .... especially for speech applicationAspect. Well, I think that is an argument for using a real-TDMA technology. But we come now to the cost. Ethernet is pretty damn cheap, and offer flexibility in design / installation. Where the traditional TDMA is based on fairly precise timing of many hosts on the network and is therefore more expensive.
Today, companies are Ethernet-based Internet networks to move, because:
- Speed are available: for example, Time Warner Telecom2 Mbit / s - GigE offers.
- Scalability to easily update and speed can be used on copper or fiber optic T1, DS3 or OC3 - OC192.
- Cost of hardware cheaper and easier to maintain. A 10/100 Ethernet card in each device level 2 (eg firewall) or Layer 3 device (router, for example) is all you need to cancel the service.
- Simple network: Instead of using a router and a firewall, you only need a piece of hardware and companies using firewalls,have routing functions (which eliminated the purchase and maintenance of a router). This helps your IT budget, maintenance of equipment (Ethernet LAN already) and you have less points of failure in the network (the hardware you have, the more points of failure in the network).
- Is to develop optical fibers: ISP, rather than letting her DS3 fiber optic networks or local RBOC ILEC's. Carriers to expand its fiber optic fingerprint and ISP areimplemented with optical fibers faster and better Internet for business. For example, the Ethernet connection.
Total Ethernet is ideal for companies in three points:
1) Price Point - the cost of Ethernet equipment and interfaces is much less Than the cost to others, as you said, mean Among other things, market penetration of Ethernet economies of scale come into play, the costs go down. Moreover, Ethernet is not usually a service charge, soCompetition in the market allows the price to come down as well (as opposed to telephone companies for qualified services delivered) were compared.
to figure 2) More engineers - is much easier to manage and maintain, as a significantly greater number of technicians / administrators to understand and comfortable with Ethernet. With an optical engineer or an engineer telco staff costs much more than an Ethernet network "engineer".
3) Ubiquity - it appears that the major players are the driving force of the market (orpulled from the market) is towards Ethernet. This means that the technological innovations towards Ethernet, not T-1, DS-3, etc. Direct
That said, I do not think optical Ethernet is available, especially to move on DWDM long-distance market. error correction and synchronization are critical for long distances and Ethernet do not really have either. So, I see Ethernet as an ideal technology for last mile, which is carried on optical services.
A limit whenYour business model needs to legacy applications may Telco (not VoIP) supported with the range outside, then channeled T services most appropriate. That if you have 15 channels of a T-1 for 9 channels for voice and data, the sense of two separate ports, one for voice and wants to make one for data.
I doubt anyone will disagree with the Ethernet protocol absolute best for a company's internal LAN. But I tried more and more ISPstheir data are already providing Ethernet encapsulated. Instead of offering air conditioning on a standard DSL, T1, DS3 ..... You want to encapsulate the data already Ethernet transport. This is usually done to allow them to offer additional services, such as a firewall on your NOC, instead of your website. But much damage from it, convert the data into Ethernet packets to their NOC.
Before bandwidth. They still have to carry your data on their linesLocation using any form of encapsulation of this traffic (DSL, T1, DS3, etc.) is necessary. But there are additional layers for Ethernet, which is now required to carry the added layers. In other words, data from the file are wider and levels for the same amount of data. A certain size it will take longer because of the additional data required for the capsules.
Lose the ability to solve problems. If a company is connected with the standardtransport law, an ISP can ping the router in its facilities. If you are forced to surrender PPPoE, not their ISP to verify the link between the NOC and their location. Often this is a last mile lines (construction) problem and there is no way to check, they know that
I could go on, but the answer is that a corporate LAN, Ethernet is the way. But not for the Internet connection for your ISP.
Now here are some other tidbits, often overlooked by business association, ifWhereas Ethernet as the backbone of their network infrastructure ......
Ethernet is cheaper than any other protocol layer-2, which is not in WAN bandwidth. Order a 100 Mbit / s from your neighborhood and ask specifically that you want a sustainable information rate of 100%. You will be shocked to learn that there are almost as expensive as a bandwidth OC3. And 'cheap because Ethernet is often without provider tells you that overbooking.
Yes Ethernethas its advantages. But certainly not the advantage that you need CPE equipment. On virgin can use Ethernet Layer 2 (VPLS). In this case, obtain the switch on the WAN side. Or you can layer 3 VLAN services. In this case, your provider will probably administer the router.
Be aware that the VLANs that are interesting. They are somewhat similar to MPLS classes of service. This means that you can have a VLAN managementdifferent applications with different service parameters. A supplier that would be two of its infrastructure properly Ethernet backbone, offering high quality IP telephony on a TLAN with a decent quality of service parameters (ultra-low jitter).
Note that if you were to purchase a fully managed MPLS VPNs for almost all companies around the world, Ethernet is not bring much more flexibility. But if you need a lot more bandwidth to burstCharacter, you should target an Ethernet Layer 3 Managed Network. No matter if a 100 Mbps Ethernet connection is overbooked, usually cost even more bandwidth and congestion that the SDH / SONET parameters of bandwidth anyway.
An important point is that currently there is no native Ethernet coverage is a myth in most of the world. In most cases, some electric 155Mbps simply pushed up to 100 Mbps, fiber because it is not simply a point yet. 1 Gbps or 10 Gbpsin this case is unavailable or incredibly expensive.
At Level 3 the grinding of bandwidth SONET is not a disadvantage. Because level 2 is still close to the potty, and a hybrid network in order. You can easily connect classes of service over MPLS with VLAN. Level 2, there are many suppliers that can offer a hybrid VPLS on any network infrastructure.
Now here is understood in the bottom line (pun ).......
In terms of quality and price / performance, theSuppliers and specific applications are much more important than technology. Currently, however, for Internet applications ..... and pure as the price difference from overbooking of bandwidth ..... Ethernet is, for most companies prefer.
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