GROUND START IMPLEMENTATION WITH SILICON LABORATORIES’ DAAS
The Silicon Laboratories’ direct access arrangement (DAA) products are designed as a telecommunication interface that rely on “loop-start signaling.” This is the predominant method of signaling between a customer installation (CI) and a central office (CO). For this method of signaling the CO provides a battery voltage between TIP and RING. The CI requests service (line seizure) by reducing the TIP-to-RING resistance. The CO senses the DC current in the loop and determines the CI is in an off-hook state, thus the term “loop-start.”An alternative to loop-start signaling is to use ground-start signaling. This method of signaling is typically used in private branch exchange (PBX) to central office (CO) lines. Ground-start lines are used in lieu of loop-start lines in these applications primarily because it reduces the time interval during which the line can be seized from either end. A simultaneous seizure of the line by both ends is called “glaring.” The details of ground-start signaling are specified in chapter 6 of ANSI T1.401-1993.
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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10/06 |
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Rev. 0.1 |
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AN30 |
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1.1 MB |
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