Bell System MF Signaling

This section introduces the MF signaling systems developed by Bell System in the 1950s. The Bell System is still used today in local networks in the United States and is nearly identical to the R1 signaling system discussed later in this chapter.

With Bell System MF signaling, which you can use on one-way or two-way trunks, supervision and address signaling are signaled link-by-link. Supervision signaling is accomplished through a Single Frequency tone for analog facilities and through robbed-bit signaling for digital facilities. Address information is sent through MF tones.

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