Choosing Dark Fiber vs Lit Fiber Service

When your applications are demanding enough to require fiber optic transmission, you’re faced with a choice. Do you order one of the lit fiber services available for your business location or do you buy or rent dark fiber and create your own transport services?

The tradeoffs can be tricky, so you’ll probably want to set up a spreadsheet to compare the performance, cost and installation time for all the services you are interested in.

Installation time? By focusing strictly on cost, you can get caught in a situation where you’ll have the best deal possible... whenever they can get it installed. That can be weeks or even months if you have a particularly difficult situation. Will that meet your needs? If you do your planning well in advance, it just might. If circumstances conspire to demand an order of magnitude bandwidth increase immediately, availability may trump lease cost.

The dark vs lit fiber tradeoff is the classic own vs rent situation. Most companies choose to survey the marketplace for bandwidth services and pick the least cost solution that meets their needs. That process is made easy by using a telecom broker, like Telarus, Inc., that represents dozens of service providers. If you have enough competition for your business, you can get much better pricing than if you are eye to eye with the only telecom sales person for a hundred miles.

One characteristic of both dark and lit fiber services is that they are extremely location sensitive. There may well be accessible fiber running on your side of the turnpike and nothing on the other side, or vice versa. Some buildings have already been “lit” by a particular carrier while others remain dark. Those dark buildings may or may not justify the construction costs of bringing in new fiber connections depending on location and how much service is needed by the tenants.

Lit fiber falls into several major categories. The traditional telecom service is SONET/SDH with OC-3 as the lowest bandwidth of 156 Mbps. An OC-3 can also carry 3 multiplexed DS3 circuits at 45 Mbps each. It’s common for companies to order DS3 and have it delivered by fiber optic cables of much higher capacity. Other SONET levels are OC-12 at 622 Mbps, OC-24 at 1.2 Gbps, OC-48 at 2.5 Gbps and OC-192 at 10 Gbps.

The hot competition for fiber optic bandwidth is Carrier Ethernet. Ethernet tends to be both more scalable and lower cost than SONET where it is available. That availability is becoming more and more common, thanks to aggressive build-outs by competitive carriers and business demand for higher bandwidths at lower costs.

Typical fiber optic Ethernet service levels are 100 Mbps Fast Ethernet, 250 Mbps, 500 Mbps, 1 Gbps Gigabit Ethernet and 10 Gbps 10GigE. Lower bandwidth such as 50 Mbps Ethernet that competes directly with DS3 may be provisioned on either copper or fiber, depending on the carrier’s available equipment.

Coming on strong for higher bandwidth fiber optic connections is wavelength services. When you order a wavelength, you are getting a virtual fiber all to yourself. Of course, there are many wavelengths on the same physical glass fiber strand, but they differ in color and do not interact. Wavelength services may sense for 10 Gbps requirements, with the added advantages of low latency and high security. With an entire wavelength dedicated to your use, you can use a different protocol than other customers on the fiber. You may be running Ethernet while others are running SONET.

The ultimate in flexibility is dark fiber. By leasing a dark fiber run, you have all the wavelengths at your disposal. You’ll have to buy the termination equipment for each end, but then you’ll have the option to light up as few or many wavelengths as you want. You can run a different protocol on each wavelength and even operate with something non-standard or experimental. Usually it is the largest companies with the most complex IT requirements that go the dark fiber route.

What type of fiber optic service makes the most sense for your operation? Don’t jump to any conclusions until you get a complete set of prices and install times for fiber optic options available for your business location or locations.



Note: Light bulb photo courtesy of Ulfbastel on Wikimedia Commons.

Gigabit Ethernet vs SONET

With the expansion of video content and moves to cloud services, business bandwidth now easily pushes the Gigabit per second level. This certainly means a move from copper to fiber optic services. But did you know that there are two types of fiber optic bandwidth to choose from? They are SONET and Gigabit Ethernet.

SONET is the original fiber protocol developed by the telephone companies to transport large numbers of simultaneous telephone calls between switching centers and internationally. SONET stands for Synchronous Optical NETwork. There is an international version of this protocol called SDH for Synchronous Digital Hierarchy. Together they are often referred to a SONET/SDH.

SONET’s origins go back to the initial development of digitized telephone conversations and the transmission of these a groups using trunks known as T1 lines. The larger T3 lines can carry the equivalent of 28 T1 lines or a data bandwidth of 45 Mbps. There are no faster copper telco standards. The next step up is OC-3 at 155 Mbps. That’s enough to transport 3 DS3 circuits and, indeed, the protocol is designed to easily multiplex and demultiplex lower level services. When you order a DS3 today, it will be transported most if not all of the way multiplexed into a OC service. A device called an ADM or Add-Drop Multiplexer gets the service on and off the optical network.

You’ve probably guessed that OC stands for Optical Carrier. There are a number of optical carrier levels that include OC-3 at 155 Mbps, OC-12 at 622 Mbps, OC-24 at 1.24 Gbps, OC-48 at 2.49 Gbps, OC-192 at 9.95 Gbps and OC-768 at 39.8 Gbps. When you hear about 10 Gbps SONET, it is an OC-192 service. The 40 Gbps that many carriers use for long haul transmission is OC-768.

What about intermediate rates? Not all levels between 1 and 768 are defined. Others, such as OC-9, OC-18, OC-36 and OC-96 are standardized but not generally offered in service.

SONET/SDH is set up in ring arrangements with two separate fiber strands for each ring. They are redundant circuits, so if one fails the other can pick up the load within 50 mSec.

Ethernet is a completely different protocol developed by the computer industry rather than the telephone companies. It is based on packets rather than telephone channels. Most LAN connected devices have a NIC or Network Interface Card that supports 10/100/1000 Ethernet. That means the device can run at 10 Mbps, 100 Mbps or 1,000 Mbps (1 Gbps). Corporate LANs may now run at 1 Gbps with some parts of the network using 10 Gbps or 10 GigE.

The equivalent of Ethernet in the LAN for local networks is Ethernet WAN or Wide Area Network. Switched Ethernet used for WAN applications is also called Carrier Ethernet. If the service is local to a particular city or metro area, it is often called Metro Ethernet or Metropolitan Ethernet and the network is referred to as a MAN or Metro Area Network.

Like telco services, Ethernet may be delivered over copper or fiber. Twisted pair copper telephone line can be used up to 100 Mbps. That speed is also available over coaxial copper cable through Cable systems. Beyond that, fiber optic connections can deliver 1 Gbps or 10 Gbps for business applications.

Ethernet is designed to be far more scalable than SONET. Instead of ordering a particular service level, such as OC-24, you order an Ethernet port capable of handling a maximum speed, say 1 Gbps. With the port in place, you can pay for Gigabit Ethernet if you need that much, or you can order 250 Mbps or 500 Mbps Ethernet and upgrade quickly and easily when the need arises.

Which fiber optic service should you order? In general, Ethernet is less expensive per Mbps than SONET. Sometimes the price savings can be dramatic. The one sticking point is that you need to have the service installed in your building. You may have one or the other services now or nothing at all. The cost of construction to bring in the right fiber from the right carrier can outweigh the monthly lease costs. You should know, though, that Ethernet can often be carried on SONET and that competitive carriers are hungry to get new buildings on their networks. These factors can affect the availability and pricing of fiber optic services to your building.

Fiber optic build-outs are progressing rapidly and the demand for high speed bandwidth increases. Even if you went out for bids a year ago, the situation may have changed for the better since then. The best thing to do is get new prices and availability for fiber optic bandwidth services for your particular business location.



Note: Photo of data center servers courtesy of WikimediaCommons

Broadband Ethernet Connections

When we think of Ethernet, it’s probably in regard to the protocol that runs on our LANs. Broadband? That’s something else entirely. Or is it?

Ethernet has moved from the LAN to the MAN to the WAN. That gives companies the opportunity to extend their networks across town, across the country and even internationally. But what about the Internet? What does Ethernet have to do with the Internet?

Ethernet and the Internet have been closely coupled from the beginning. The Internet is based on IP routing, not legacy telco circuit switching. But the Internet would have gone nowhere without telco technologies such as T1, DS3, and SONET/SDH (OC3, OC12, OC48, etc.) That’s because the telephone companies owned the digital lines and their mature technologies. The sensible and cost effective approach has been to do what is necessary to use these existing services to transport IP packets as well as other voice and data traffic.

That brings us to access. What do you have to connect with the Internet? It’s likely a T1 line, DS3 connection or a fiber optic service based on SONET. Very small businesses may be using DSL, Cable broadband, two-satellite or 3G & 4G cellular wireless. Why not use Ethernet as your last mile connection?

That’s a good question. In fact, it makes more sense now to install a broadband Ethernet connection to the Internet than ever before. The technology is proven and already deployed to most major cities and suburbs. What’s more, it will probably save you money.

The most popular and lowest cost Ethernet broadband services use Ethernet over Copper or EoC technology. This appears to be similar to T1 technology in that it is based on using twisted pair copper wires to bring the service into your building. Chances are that you have the wiring in place already for multi-line telephone service and perhaps a T1 line or two.

Ethernet over Copper offers dedicated Internet access, just like T1, where you have a committed bandwidth level that does not vary and is not shared with other users. The technologies are a bit different in that the EoC interface to your LAN is a simple Ethernet connector. If you are already using a managed T1 router, that may not be important because the interface is already handled by the service provider and you simply connect your edge router to the T1 router.

You’ll notice a difference in bandwidth scalability. T1 lines are designed around a fixed bandwidth of 1.5 Mbps. If you want more, you bond additional T1 lines in 1.5 Mbps increments. This is practical up to around 10 Mbps before it become too expensive for most applications. Ethernet over Copper bandwidth typically starts at 2 Mbps, with 3 Mbps a popular speed for about the same price as a single 1.5 Mbps T1 line. But EoC can easily deliver 5 Mbps, 10 Mbps, 15 Mbps and even 20 Mbps. If you order a port with enough capacity, you can often just call your service provider and have them increase your Ethernet bandwidth at will.

What about higher bandwidths? Above 20 Mbps, perhaps as high as 50 Mbps, you’ll need to switch to a fiber optic connection that offers almost unlimited bandwidth expansion. Once again, Ethernet over Fiber is as scalable as Ethernet over Copper. A Fast Ethernet speed of 100 Mbps is very popular because it is also a standard LAN speed. Larger organizations or more demanding applications will want 1 Gbps or Gigabit Ethernet speed. If you need it, 10 Gbps and even 40 Gbps or more is available.

Broadband Ethernet is not available for residential or home office users. For businesses with their own business addresses, you can get pricing and availability on broadband Ethernet services for whatever bandwidths you are interested in. Costs are very attractive, although Ethernet is a metro service and not readily available in rural areas. For those locations, you’ll need to stick with T1 and bonded T1 solutions.

Low Latency Fiber Network For Orange County

Businesses are demanding more bandwidth at lower latencies to support demanding applications such as financial trading, business process automation, cloud computing & storage and medical image transmission. This is creating an opportunity for new fiber buildout, like the one underway in the Los Angeles Metro area.

AboveNet, a major provider of fiber optic networking services in the US and Europe, is launching what they call a large “feeder ring” to connect office buildings, data centers, and carrier hotels to an existing fiber optic backbone that now serves the business districts of Irvine and Costa Mesa in Orange County, California.

Fiber optic connectivity has become the new battleground for competitive service providers as well as incumbent telcos. A major push has been the transition from legacy SONET/SDH to Gigabit Ethernet, 10 GigE and 40 GigE, MPLS networks, dark fiber and wavelength services. Networks are becoming more IP oriented, at the expense of traditional switched circuit TDM technologies. This plays well with the dominance of Ethernet networks in business and the move to converged voice, data and video networks.

Cloud services have opened up a further need for increased bandwidth. When companies had on-site data centers for their servers and storage, most traffic was contained within the building or campus LAN. Special links served overnight tape backup at offsite storage centers. Once computing and disk resources move to a colocation facility or a cloud services provider, there is a corresponding increase in WAN bandwidth requirements. With everything “out there,” a much higher portion of traffic leaves the company LAN.

AboveNet and other carriers are in a major push right now to expand their fiber optic network footprints in the US and abroad. Especially important are low latency networks to Europe and Asia to interconnect financial markets and major international businesses. Private networks require an enormous capital investment and the Internet is unsuitable for high performance, secure connections. That’s creating an opportunity for companies that specialize in metro and long haul fiber optic networks to jump in and fill the need.

Some services that are seeing more demand are IP transit to connect with the Internet backbone for companies that don’t have networks large enough to do their own peering, Ethernet Private Line and LAN services, global MPLS networking, and wavelength services that offer both very high bandwidth capacity along with flexibility of protocols.

Competitive pressures have also reduced the cost per Mbps for nearly all leased line services. This is true for even the ubiquitous T1 lines, but even more so for Ethernet connections of all types. Ethernet availability has expanded to such an extent that it is often far less expensive than T-Carrier or SONET in most metro areas. Gigabit Ethernet and 10 GigE WAN connections are now routinely ordered by larger business and organizations.

Is your company bandwidth starved or simply looking for better prices on existing network services? See if you can do better by checking prices and availability for fiber optic bandwidth.



Note: Orange County, CA photo courtesy of Wikipedia Commons.

Metro Ethernet MPLS Combo

Two of the hottest networking technologies now are Metro Ethernet and MPLS networks. We normally think of using one or the other. But what advantages are gained when you combine the two?

Metro Ethernet is the familiar Ethernet protocol that we’ve come to know and love on our LAN networks. It’s not exactly the same, because it needs to be adapted to work over longer distances than typical building and campus runs.

This, and other service enhancements, have been standardized by the Metro Ethernet Forum (MEF), an industry group comprised of over 170 companies and more than 75 service providers. The MEF has defined five attributes that distinguish what they call Carrier Ethernet from the familiar LAN based Ethernet. These are standardized services, scalability, reliability, service management and quality of service.

What carriers get is a set of certified network elements that work to connect users on a local or worldwide basis. They also have services that can be transported over whatever physical networks they have available, including legacy TDM networks originally designed for telephony.

Metro Ethernet is Carrier Ethernet implemented within a city or metropolitan area. Two of the popular standardized services are Ethernet Line Service, a point to point connection, and Ethernet LAN Service, a multipoint connection. Companies use Metro Ethernet to link branch office buildings, factories, warehouses, data centers and other locations in the area.

Ethernet can also be used as a last mile access connection to larger private networks or the public Internet. These links have traditionally been T1 lines, DS3 connections, or SONET/SDH fiber optic services. Ethernet is growing in popularity as a network access service because it is lower in cost and more scalable than legacy telecom services.

At the same time that Carrier Ethernet has soared in popularity, MPLS networks have seen a similar growth in demand. Most networks have a defined protocol that they run. This can be TDM, IP, Frame Relay, or something else. The beauty of MPLS networks is that they are designed to support all protocols. Hence, the name Multi-Protocol Label Switching. The label switching part has to do with a tagging system that is used to encapsulate and route packets while they are on the network. Since the MPLS network doesn’t need to use the internal packet structure for routing, it doesn’t matter what those labels are attached to.

Most new large scale networks are based on MPLS. It doesn’t matter what’s running as the core network. It might be IP. It might be SONET. What the user sees is a privately run network that can securely transport voice, data, video or converged network traffic within a city, between cities or around the world. MPLS networks have all but completely replaced the older Frame Relay networks that were once used to link computers over wide areas.

What you probably have guessed is that Ethernet and MPLS are very compatible. Many carriers have nationwide or international MPLS network service footprints. You can combine Ethernet access with a large MPLS network and create a very cost effective way to link your geographically diverse business locations.

Large scale Carrier Ethernet networks are also on the ascendency. A new interconnection standard called ENNI or Ethernet Network to Network Interface connects Carrier Ethernet service providers so they can share traffic and effectively increase their service footprints. The underlying transport networks may or may not be MPLS networks themselves.

What’s combination of Ethernet and MPLS offers the highest performance at the lowest cost for your applications? There are network consultants available right now to provide you with Metro Ethernet and MPLS service options and pricing at no charge for serious business and organizational users.

Moving on From SONET To Ethernet

Technology change is something we’re all familiar with. Every year, there’s a new bevy of cell phone models that make the old ones look tired and obsolete. Tablets are moving into to take over from netbooks even before netbooks completed taking over from laptop computers. It’s only in the staid world of telecommunications that technology time stands still... or does it?

Actually, there’s been a revolution brewing in telecom for decades. It’s all about move from circuit switching to packet switching technologies. Circuit switching got established from the days of Alexander Graham Bell and only became more entrenched as capital investment in central office switches and digital transmission equipment accumulated.

So, what’s wrong with circuit switching? Technically, nothing. It’s a mature technology honed by a century of refinement. So what’s the motivation to move away from a sure thing?

It’s all about computer networks and especially the Internet. While once there were many architectures and protocols, now the lion’s share is Ethernet. Except for a few special situations that still benefit from non-IP network designs, everything is supporting Ethernet. The economy of scale in manufacturing has operated as a positive feedback loop to ensure that you need a very good reason and deep pockets to select anything but off-the-shelf Ethernet interfaces.

The battlefront is at the interface between LANs and the outside world. It’s Ethernet inside and something else outside. That something else is telecom standardized circuit switched wireline and fiber optics. The need to succeed has made the two compatible through specialized interface hardware and software. But how long will this standoff continue?

Not much longer by the looks of things. Competitive carriers have build their new networks with IP cores rather than adapting traditional SONET fiber optic switched circuit services to transport their Ethernet offerings. SONET/SDH is the high end of circuit switching development and likely the end of the line for this technology path. It has a maturity level and deployment that far exceeds the upstart Carrier Ethernet. Ethernet is the future, SONET is the present and, more and more, the past. At some point, the momentum will switch and the Ethernet takeover will ensue en-masse.

That point may be sooner than any of us think. As evidence, a major competitive carrier, XO Communications, has announced that they are not planning to buy any more SONET moving forward. That’s especially significant since XO is rolling out a major network upgrade over the next few years. This should put a smile on the face of product managers in charge of Ethernet switches, routers, multiplexers and the like. It should have the opposite effect on those planning development and production of SONET equipment. If more carriers follow suit, you’ll see Ethernet lines becoming more robust and SONET heading for end-of-life management.

You can see the handwriting on the wall by comparing Carrier Ethernet line services with their SONET equivalents. On a Mbps and Gbps basis, Ethernet is getting cheaper faster than SONET in most areas. As the price gap widens, IT managers will need more and more justification for choosing SONET over Ethernet. Even if there’s capital investment involved in switching over to all-Ethernet networking, it will increasingly be seen as a smart move.

How about your high bandwidth connections? Could you be benefiting from Carrier Ethernet right now and not realize it? Time is money, so don’t wait any longer to find out. Get Carrier Ethernet service prices and availability now. You, too, may become part of the stampede from SONET to Ethernet.



Note: Fisheye photo of data center courtesy of Wikimedia Commons

Switch to Switched Ethernet Service

Are you still living in the world of telecom past? Those are the days when you had one network protocol inside and something completely different outside. Switch to switched Ethernet service and your network has more options and easier interfacing.

What constitutes telecom past? It’s the legacy transport services developed as telephone technologies and later pressed into service to connect data networks through the public switched telephone network. That includes such favorites as Frame Relay, T1, DS3 and SONET/SDH.

What’s so bad about these venerable telecom services? Nothing at all. They are time-tested solutions to business connectivity. All of these services are readily available, perhaps with the exception of Frame Relay which is being rapidly replaced by MPLS networks. They offer high reliability and dedicated bandwidth suitable for business operations. The only real question is whether these are the BEST options available for your connectivity needs.

There’s a newer networking technology being deployed nationwide, indeed worldwide, right now. What it does is simplify the LAN to MAN to WAN connection. Everything is standardized on the Ethernet protocol. Connectivity is seamless, since outside network connections simply plug into your network edge Ethernet switch and become an extension of your LAN.

Contrast this approach to having to install a CSU/DSU interface card into a router to make the networks compatible. Inside your company, everything is packet based. Outside, those packets have to be shuttled into and out of TDM channels that transport them between locations or to and from the Internet.

With an all-Ethernet system, you also gain some service options you didn’t have before. Ethernet line service gives you a point to point connection between two LANs at different locations. Ethernet LAN service creates a multi-point to multipoint network that links 3 or more locations. All of these locations will appear to be on one large bridged network with switched Ethernet service. The engineer at the desk across town is effectively right next door to the marketing manager a couple of states away and the warehouse on the other side of the globe.

Just to add icing to the cake, Ethernet services also tend to be lower in cost per Mbps than equivalent legacy telecom services. It’s not uncommon to get 3 Mbps Ethernet at the same price as 1.5 Mbps T1 service. The distinction gets even larger as you go up in speed and include multiple locations.

Are you missing out by still depending on yesterday’s telecom technology to support today’s business needs? Check pricing and availability of switched Ethernet service to see if you can get better service for less money? There’s a good chance you can.

AboveNet Core Wave Makes Dedicated Wavelength Bandwidth Available

What do you do when ordinary bandwidth is no longer up to the task? You go above and beyond with AboveNet’s Core Wave service. For demanding financial services, media, health care, retail and government applications, you really do have to get to the core of fiber optic transport. The very core.

Most telecom services are electrically multiplexed somewhere along the way. What multiplexing does is combine your bandwidth service with dozens, hundreds or thousands of others to fill the capacity of a fiber optic core network. But what if you have enough demand on your own to take all the bandwidth a service provider can deliver?

One answer is to become your own service provider. You do this buy building-out or buying fiber strands or even entire fiber optic cables. That’s what Cable TV MSOs do. So do major telecom service providers. But bandwidth is their business. It’s what they do to generate income. You aren’t really in the business of bandwidth. You simply want to use large amounts of bandwidth to enable your business processes. Does investing large amounts of capital in fiber infrastructure really make sense for your corporate mission?

Of course it doesn’t. What does make sense is to partner with a service provider that has already made the investment and has enough bandwidth capacity at their disposal to meet your current and future needs. AboveNet has that capability and now they are making it available to large organizations in major markets.

Let’s take a look at AboveNet Core Wave. It’s a high capacity bandwidth service for point to point connectivity in metro areas, like New York City. Right now you can get 1 Gbps, 2.5 Gbps and 10 Gbps service. The platform is scalable, so that when demand justifies it AboveNet can also offer 40 Gbps and 100 Gbps bandwidth services.

How are they doing this? The platform is built on a fiber optic network managed by ROADMs. A ROADM is a Reconfigurable Optical Add Drop Multiplexer. This is the cutting edge of fiber optic networking. What a ROADM does is manage the traffic on the network optically. Each fiber transports not one, but many different light beams known as Lambdas or wavelengths. Each wavelength is said to have a different color, although these are in the infrared spectrum and not visible like the colors from a prism. A ROADM can manage dozens or hundreds of wavelengths in a process known as DWDM or Dense Wavelength Division Multiplexing.

Normally wavelengths have such high carrying capacity that they transport traffic for many companies. But Core Wave gives you the option of having your own dedicated wavelength. The wavelength is like a blank slate to be written on, so you are not forced into the protocol of the core network. AboveNet gives you the choice of Ethernet, SONET/SDH, or Fibre Channel for storage networking.

Are your bandwidth needs pressing the limits of conventional telecom services? If so, perhaps it is time you moved up to fiber optic wavelength services, like AboveNet Core Wave. Why not check pricing and availability now? There is likely more capacity available than you think.