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A T1 is considered to be an integrated T1 when it combines more than one type of service. Typically, this is a combination of voice and data, or possibly different types of data services combined onto a single T1 facility. For an integrated T1 line to be installed, multiplexing must be done on both ends of the T1 to de-multiplex the original DS0-level circuits.* On the customer end, this is typically a Drop/Insert Mux, a Channel Bank, or a TDM Mux. On the carrier end, multiplexing is performed by a DXC 1/0 (Digital Cross-Connect DS1-DS0). This device is the carrier-equivalent of a few hundred channel banks, all in one device. *The combined services do not have to be individual DS0 circuits. The only stipulation is that the total bandwidth can be combined by the appropriate multiplexing equipment on either end to combine and/or map the circuits towards their appropriate destination. Typical Examples (each example depicts a full T1):
Theory Lesson. In its basic form, any DS-Level integrated circuit can be broken down into multiple "channels" where each represents a time slot. Divide a 1.544 MHz DS1 by 24 (less 8kb for framing and line coding) and the result is 24 x 64 KB circuits. These DS0s can be voice or data, provided that the service can be combined into a 64 KB data stream. The concept of multiplexing is combining several slower speed circuits (or services) into a single higher speed circuit. This practice is very commonplace in the Telecommunications infrastructure. DS0s are combined into DS1s, DS1s are combined into DS3s. DS-level circuits are carried by copper pairs. Once you exceed the 45 MB speed reached by DS3s, a conversion to optical circuits takes place. |
Integrated T1
