Optical Ethernet Connections To The World

Fiber optic connections are becoming common for network operations. How about for WAN (Wide Area Network) connections? Are you limited to what’s available on Ethernet over Copper or forced to abandon Ethernet for an unrelated telecom protocol?

Not any more. Ethernet connections have become established and far more common than you might think. This does include the lower bandwidth options over twisted pair copper, but it also includes high speed services over fiber optic connections. With fiber, you can pretty much have all the bandwidth you care to pay for. That payment may also be a lot less than you think.

Ethernet over FIber or EoF offers a set of high bandwidth services that meet the specifications of the Metro Ethernet Forum (MEF). All together, these standardized services are referred to as Carrier Ethernet as distinguished from Ethernet that runs on a local area network. These two types of Ethernet are highly compatible. Carrier Ethernet runs in the switched configuration only. There is no CSMA/CD capability. This is actually the way most networks run today. Nearly all use switching and routing to gain full duplex performance. Carrier Ethernet also has provisions for OAM or Operations, Administration and Maintenance that is needed by carriers to ensure that the link keeps working reliably.

There are some real advantages in having standardized services available that meet the MEF requirements. Like standardized equipment, you know what you are getting and that it will interoperate or work with similar services from other vendors. Part of the rapid expansion of Carrier Ethernet is due to the ability of exchanging traffic between service providers through an Ethernet NNI or Network to Network Interface. All carriers have limited fiber optic assets and would be constrained by their own service footprints if they couldn’t interconnect with other carriers. By entering into traffic sharing arrangements, it is possible for carriers to span the nation and the globe.

Two of the standard Ethernet services you may be interested in are E-Line or Ethernet Line and E-LAN or Ethernet LAN service. E-Line is the equivalent of the point to point private line available with T-Carrier and SONET telecom services. E-LAN is something different. This is a multipoint connection that can be used to network multiple business locations as if they were on the same bridged LAN. Everything operates at layer 2 so that switched Ethernet is available across town or to the other side of the globe.

Carrier Ethernet connections are through ports on a UNI or User Network Interface. Typical fiber optic port speeds mirror standard LAN speeds of 100 Mbps Fast Ethernet, 1000 Mbps GigE and 10,000 Mbps 10GigE. This differs a bit from standard telecom services that have unique circuit interfaces for T1, DS3, OC-3, OC-12, OC-48, etc. Many carriers find it easy to install Gigabit Ethernet ports as a standard practice and then rate limit the bandwidth to the amount ordered by the customer.

The port itself will accept traffic at any speed up to the limit of the port capability. Let’s say that’s 1 Gbps. Since you have only ordered and are paying for 150 Mbps bandwidth, that’s what you’ll have on your Ethernet Line or LAN service. The real beauty of this system becomes apparent when you need to upgrade from 150 to 500 Mbps. All you need to do is call your service provider and notify them of the change. They’ll adjust the rate limit to increase your bandwidth up to the 500 Mbps level. There is no physical change to any of the equipment in the signal path. That means the change can be implemented in a matter of days or hours rather than weeks or months.

Ethernet bandwidth services often have many bandwidth increments available. You don’t have to jump from 150 to 500 Mbps. You may be able to get 200, 250, 300, 400 or some other increment offered by the carrier. Most carriers have a fine layer of granularity available because it’s all done in software.

Can you make good use of fiber optic Ethernet connections to the Internet or other business locations? If so, get prices, features and bandwidth levels available for optical Ethernet connections to your business location.



Note: Photo of Earth from space at night courtesy of NASA on Wikimedia Commons.

1 Gbps Point to Point Ethernet Connection

With WAN bandwidth requirements increasing as businesses move to the cloud and become more involved with bandwidth intensive activities such as video and big data, it is not uncommon anymore to be requesting 1,000 Mbps connections. A popular match for this requirement is a 1 Gbps Ethernet or GigE point to point connection. Let’s take a look at what’s involved and your options for Gigabit Ethernet service.

Ethernet is the standard protocol of the LAN. Most network interfaces run at 10 Mbps, 100 Mbps, 1000 Mbps or 10 Gbps. Many standard network devices support multiple speeds, typically 10/100/1000 Mbps. It is only logical to want to extend the LAN through the WAN and to another LAN somewhere else. The way to avoid speed bumps that cause network congestion while avoiding over-provisioning and overpaying for WAN bandwidth is to match your LAN to your WAN. That means standard LAN speeds and protocol.

Fortunately, this has all been figured out by the Metro Ethernet Forum (MEF), an industry group that sets standards for interoperability among vendors. They have created the standards necessary to take LAN Ethernet and transport it through WAN connections. In the WAN, this is called Carrier Ethernet.

It all starts and ends with a User Network Interface or UNI. This is a “port” provided by the carrier or service provider and installed at the user location or locations. The UNI is designed to run at standard LAN operating speeds of 10 Mbps, 100 Mbps, 1 Gbps or 10 Gbps. That doesn’t mean that you are limited to one of those service speeds. The installed UNI defines the upper limit to the bandwidth it will support. The carrier rate limits the actual speed of the service to match the bandwidth you are paying for. That could be 20 Mbps, 75 Mbps, 450 Mbps or some other value. There are typically many increments to choose from so you only have to pay for the bandwidth you really need.

There is a big advantage to this arrangement. Not only are you not stuck with a service that is too big or too small for your needs, but all the hardware is set up to support the port speed of the UNI. The rate limiting is a software function that can be changed quickly by the service provider with a few keystrokes into their system. That means that you can call up and request a bandwidth increase at any time and have it available in days, maybe hours of your request. The carrier will enter the change and adjust your billing to match. Compare that to traditional telecom service that require truck rolls to install new equipment and perhaps pull new wiring. If your UNI supports 1 Gbps, you won’t need any hardware changes until you want to go above that speed.

The actual transportation takes place on an Ethernet Virtual Connection or EVC. The EVC provides point to point connectivity between designated UNIs and prevents data transfer between sites that aren’t part of the same EVC. The popular Ethernet point to point service is known as EPL or Ethernet Private Line. It is a direct replacement for TDM private lines.

Another interesting feature of Ethernet UNIs is that they can handle multiple EVCs. That may seem a little strange compared to typical telecom UNIs that connect physical wires and transport a single Point to Point (PTP) line service. Each EVC can be considered a separate private line. Multiple EVCs delivered over a single UNI is called EVPL or Ethernet Virtual Private Line service. One popular topology is a hub and spoke arrangement where a headquarters location is connected to multiple branch offices using EVPL. Only a single physical UNI is needed at HQ to support all the private line spoke connections.

Is your operation ready for higher bandwidth WAN service? Find out how little it now costs to support 1 Gbps Point to Point Ethernet Connections using EPL and EVPL.

What is Metro Ethernet?

We’re all familiar with Ethernet, the packet switched network standard that runs on our LANs. But what is Metro Ethernet and how does it differ from Carrier Ethernet? Is Metro Ethernet the same protocol running on local networks but just going longer distances?

From a users standpoint, Metro Ethernet really is just like local Ethernet. In fact, the connection to the Metro Ethernet Network is a standard Ethernet connector. There are no special interface modules needed to convert protocols or establish signal levels. You simply plug one network into the local Metro Ethernet connection and another network into the Metro Ethernet connection across town and they are connected together.

Actually, it has taken quite a bit of effort to make Metro Ethernet so simple. That work has been done by the Metro Ethernet Forum (MEF), a industry standards group. The beauty of standards is that both providers and users know exactly what they are dealing with. There aren’t the ugly surprises that come from trying to engineer basically incompatible products and services.

The terms Metro Ethernet and Carrier Ethernet tend to be used interchangeably. Carrier Ethernet is meant to describe standard switched Ethernet adapted for use over much longer spans than within a building or corporate campus. Carrier Ethernet can be deployed on IP core networks, over SONET/SDH, or over MPLS networks. The end user isn’t generally aware of the transport mechanism. From the customer’s standpoint, it’s just Ethernet ports at each location.

Metro Ethernet is the term that is used to refer to Ethernet services limited to a particular city or metropolitan area of city and suburbs. It’s a popular service for companies that have two or more separate business locations locally. Medical groups consisting of several hospitals, diagnostic centers and clinics are also find Metro Ethernet attractive because of its high bandwidths, ease of connection and lower costs compared to traditional telecom line services.

The customer service connection is made at a User-Network Interface (UNI) installed by the service provider. On one side is the Customer Equipment (CE) and on the other side is the Metro Ethernet Network (MEN). The path between UNIs is made through an Ethernet Virtual Connection (EVC). The EVC maintains the Ethernet MAC address and frame contents unaltered, so it is possible to establish Layer 2 connectivity between locations. It also ensures that traffic goes between the proper UNIs and nowhere else. Think of an EVC as similar in function to a “wired” network connection between two locations.

There are two Metro Ethernet services you’ll be interested in. One is Ethernet Line or E-Line service. This is the equivalent of point to point private line service using T1 or DS3. The other is Ethernet LAN or E-LAN service. This is a multipoint to multipoint service that can be used in place of private proprietary networks, Frame Relay, or MPLS networks to connect multiple locations in a mesh network. Both of these services are suitable for linking offices, factories, warehouses, data centers and other sites within a metropolitan area.

Could your organization benefit from Metro Ethernet? If you have need to connect two or more locations within a city or small geographical area, you may be able to get more bandwidth for less money than you can with other connectivity solutions. To find out, check Metro Ethernet Network availability and pricing for your business locations.