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A DS3 connection is typically made using either coaxial cable or copper wire to a multiplexer (mux), typically called an M13, is a Telecom term for the device required by either Telco's or large business users to break down the DS3 signal into DS1 (T1) level connections which are required by most PBXs and Routers. While each DS3's connection has a capacity to carry 28 DS1s, it is not required that it carry all 28. For termination, a DS3 mux is placed between the DS3 facility and those devices requiring DS1 (T1) connections, and a mux card is used to decode the DS3 time slot for each respective DS1 of service being carried by the DS3. If DS1 output is not desired, a DS3 mux will be used to statistically divide (stat mux) the 45MB data stream into the desired bandwidth increments. Typical Applications. Only carriers or very large businesses that need extremely large amounts of bandwidth generally use DS3 connections in a point-to-point arrangement. For example, Carriers use DS3s within their network for routing voice traffic in large groups (672 circuits each). Businesses may use DS3s to interconnect major computing facilities in a ring or mesh topology. When a DS3 Connection is needed for access savings where the actual services used are at the T1 level, an immediate termination to an M13 will be needed at the customer end. When M13 muxes are used, they may be used solely to de-mux DS1s for digital termination at the DS1 level directly into a PBX, or CSU (for data services), or may be followed by Channel Banks that are used to break the resulting DS1 signals down further into DS0 circuits.
How and Where DS3s are Used. DS3 connections represent high capacity circuits, typically used by Telephone companies and large business users that require far 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 45Mb 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:
Please see our multiplexing page for an in-depth tutorial about multiplexing schemes. |
DS3 Connection
