Data Network
One of the most important aspects of colocation service is the quality and stability of the colocation provider's data network. You are going to want fast, highly-available internet connections, with record-setting uptime from your colocation service provider. Here are the things to look for when evaluating a colocation service provider's data network:
 Size And Number of Connections. There are a remarkable number of "garage" colocation and hosting operations out there, even to this day. Such providers may only have a single T1, T3 or Fiber line, from a single provider, as there sole source of internet connectivity. It is imperative that you insist on a provider that has multiple, large connections from multiple providers, with the network infrastructure in place to maximize the benefit of the same (i.e. routing and failover resources). World-class data center networks have OC (Optical Carrier) connections on the scale of OC48 up to OC192, with multiple primary providers, and in addition will often have direct connections to other networks to speed data movement and reduce hop counts (see Peering below).
Carrier-Neutrality. The old adage about not putting all your eggs in one basket definitely applies here. A colocation provider who is locked in to service from just one or two carriers has limited options, and limits your options as well. For instance, if you wish to run a dedicated line (dial-up, DSL, PRI, etc) to your equipment, you may be forced to obtain the line from your colocation provider's exclusive carrier, like it or not - and if they don't have that service, too bad! A carrier-neutral facility not only has more options and negotiating power for the network connectivity that they provide to your equipment, you also can obtain direct service from any carrier who can run a line to the service address.
Utilization Level. This is a measurement of how much of the data network's capacity is being utilized at any given time. Obviously, as utilization nears capacity, network congestion issues will being to arise in the form of latency and generally degraded service quality.
Peering. Peering is a relationship between two or more networks in which they create a direct link between each other, and agree to forward each other's packets directly across this link instead of using the standard Internet backbone. A colocation service provider who has established peering arrangements with a large number of other networks can provide superior transit time with greatly reduced hops on a significant percentage of internet traffic. Because of this, peering is a desirable characteristic when evaluating a colocation provider's network architecture.
 Network Redundancy. The multiple connections of a superior data network should be configured to effectively provide redundancy, so that if one interface goes down, traffic is seamlessly shunted to the remaining interfaces without appreciable impact on data flow.
Migration Path. Despite grand plans and efforts, it is likely that your colocation project will start out relatively small with minimal demands for network connectivity. Your colocation service provider should be able to accommodate rather humble beginnings, while allowing for easy and non-disruptive growth as your bandwidth demands increase.
All of the colocation service providers referenced on this site provide the essential features described above. Many other providers do not, so you are advised to shop and compare very carefully when evaluating providers!
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