There’s a big difference between a T1 and the OC’s. The most obvious is speed. Make sure you know what you need when picking out backbone bandwidth.
Luckily, in prison we have access to some dedicated fiber and I got a SLA for my service. Ain’t no downtime for T Dog, what!
Starting at 51.8 Mbit/s, the OC-1 is the slowest you can get. What ever integer comes after the OC (OC-?) would be multiplied by 51.8 Mbit/s. So, an OC-192 would blaze at a whopping 9.9 Gbit/s. Yes, thats 10 bit Gig’s. An OC-768 circuit delivers bandwidth of 39.7 Gbit/s. Wouldn’t it be nice? One day they will be available to residences, but probably not in the foreseeable future.
I guess I don’t need to mention that this is a fiber optic connection. A SONET (synchronous optical networking) fiber optic communications circuit to be exact. These provide the backbone of a major network like your big named carriers. While the rest of us can just get T1 line or PRI for voice, these guys are fueling us and need much larger bandwidth. OC-3 and OC-12 are relatively small as far as the standards of the carriers go and would be in remote locations. OC-48 and OC-192 would be on the larger end, in their main locations and the OC-768 is amazing. Definitely on the huge end.
The OC-X circuits can also be used as a point to point connection between offices. You see this in government applications. Whatever large network you find, you could find all kinds of differnet OC-X connections such as, OC-9, OC-18, OC-24, OC-36, OC-192, OC-255. There really is a lot of flexability when deciding on what kind of backbone you need.