User guide

August 2001 21
Defining Digit Types
Figure 5. The R2 Compelled Signaling Sequence
Each end waits for an acknowledgment or end of signal until it
times out. This handshaking makes compelled signaling more
robust than other non-compelled signaling methods.
The speed of compelled signaling depends on the quality of the
link. If the lines are good, then detection time and overall
performance is fast, but bad lines delay detection and slow down
the signaling. In non-compelled signaling, you would have to set
the digit duration high enough to account for bad lines, which
makes signaling consistently slow even if the lines are good.