Increasing Bandwidth By Pair Bonding

If you have a bandwidth service, say a T1 line, and are starting to run out of bandwidth, then what is your next logical move? You could bring in a higher level service such as DS3, but that could prove tricky. Your T1 line is delivered over twisted pair copper. DS3 is generally brought in using fiber optic cable. Also, there is a tremendous jump in bandwidth and expense from a T1 line at 1.5 Mbps to a DS3 connection at 45 Mbps. Are there other options?

Perhaps the easiest move up is to simply add another T1 line if all you need is incrementally larger bandwidth. If you get both your lines from one carrier, they can do what is called “pair bonding” to make the two lines act like they are one larger line. For instance, two bonded T1 lines give you 3 Mbps. That goes to 4.5 Mbps with 3 lines and 6 Mbps with 4 lines. A practical limit to bonding for T1 is somewhere around 10 to 12 Mbps.

There is also another form of pair bonding you should be aware of. Instead of bonding T1 lines with their DS1 signals, dry copper pair can be leased with no signals of any type. They’re just plain copper wires running from a central office to a business location. Using multiple copper pair with special terminal equipment installed at each end, Ethernet over Copper or EoC can be provided by competitive carriers.

Ethernet over Copper uses a completely different form of modulation to transport the digital signals from provider to customer. Advanced techniques such as MIMO (Multiple Input Multiple Output) may be employed to reduce interference between signals on pairs bundled in the same cable. This allows more bandwidth to be transmitted using fewer wires than would otherwise be required.

The result is that Ethernet over Copper can transport higher bandwidth services using pair bonding. You can typically get 3 Mbps to 10 Mbps from EoC services. In some cases, that can be increased to as much as 50 Mbps. The higher the bandwidth, the closer you have to be located to the telco office. That’s because the techniques used to increase bandwidth are affected by distance. The signal fades as you get farther away from the source.

T1 lines don’t have this distance restriction, as the technology was designed to incorporate regenerators every mile or so to boost the signal. If you are located too far from the carrier’s point of presence to get Ethernet over Copper, you may qualify for Ethernet over DS1. That’s a technique that uses the T1 line protocol to transport Ethernet. You are essentially getting an Ethernet signal delivered using one or more T1 lines. In this case T1 pair bonding can be used to increase bandwidth.

Will some form of pair bonding get you the business bandwidth you need at a reasonable price? Find out what business bandwidth services are available for your location now.