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The bandwidth capability of a DS3 (also known as a T3) is 45Mb. Due to the capacity of a circuit this large, DS3s are typically used by mid-large businesses, as well as Telecommunications carriers for routing traffic throughout their own networks. DS3 bandwidth can be a combination of multiple T1 services, or a single service type (such as access from an ISP). DS3s, by definition, are a copper-based service, but more and more frequently, Telecommunications Carriers have expanded their fiber optic systems closer to the end user, and DS3-level customers are their highest priority. As such, a large percentage of DS3 circuits are actually all-fiber, but with a DS3 interface point on the light-wave terminating equipment. DS3 restoral can be achieved by either splicing copper facilities, or in more recent times, when DS3s are provisioned over SONET-based optical systems, near instantaneous restoral (via rerouting) can occur in case of a link failure. DS3 Explained. DS3 is a Telecom term for "Digital System 3" which represents a 45MB circuit that is carried by 4 copper wires (or via fiber and converted back to copper at the customer site) and can support a wide range of services to include voice, data, and video. Through multiplexing (explained in detail later), this single DS3 facility can carry a combination of all many types of services into a single circuit, reducing monthly access costs. How and Where DS3s are Used. The DS3's bandwidth is very large. Being a high capacity circuit, a DS3 is typically used by Telephone companies and large business users that require more than a DS1 (T1 or 1.544Mb) of connectivity. In terms of capacity, a DS3 is equal to 28 DS1s (T1s) of capacity. Due to equipment multiplexing limitations, most business users that need more than a few T1s of capacity opt for the next "level" of service as a DS3, because access costs on NxT1 vs. a DS3 will typically break-even at about 4 T1s (6mb). Once the DS3 facility is leased, adding T1 capacity requires very little lead-time, and no additional monthly cost for the access facility. Common Names / Muxing Levels:
Typical Applications. DS0s are typically used as voice-level or dial-up data channels. DS1s are typically used as either private point-to-point circuits between facilities, or more typically, access from a business to either their local or long distance provider. DS3s are typically used where more than one DS1 is needed for capacity. While a DS3 might be deployed for capacity reasons, not all DS1s must be activated, so if a company needs 6MB of capacity, a typical installation might have a DS3 established for "access" and only 4 DS1s "activated" on the DS3 facility. Please see our multiplexing page for an in-depth tutorial about multiplexing schemes. |
DS3 Bandwidth
