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U-90E Data/Fax Modem
someone picks up the phone. You can also have the answering machine answer only the
voice ring. A more complicated use is that you can have one number for multiple uses,
such as one number for both data and fax.
A ring signal is a composition of repeated on and off states. Different types of rings usually
correspond to different compositions of the "ON" part (cadence) of the ring. Your modem
can distinguish up to four types of ring signals and can be commanded to answer or not
answer any one of these four types of ring signals. Following is a list of these four types of
ring signals. These are the ring types used in the USA. The difference among the ring
types is the two-second ON part of the ring signal. It comprises a long, double short, or
triple short ring.
S-register S40 bits 3-6 are used for distinctive ring control. Each bit controls the
answering of a particular ring type. Setting a bit to "1" (on) enables answering, setting it to
"0" (off) rejects the ring. Note that the ring may still be heard even if it is not counted as an
accepted ring by the modem.
The control relationships between bits 3-6 in register S40 and the different ring types are:
Type
Bit (on)
Ring Sequence
1
3
1.2s or 2s on; 4s off
2
4
0.8s on, 0.4s off, 0.8s on; 4s off
3
5
0.4s on, 0.2s off, 0.4s on, 0.2s off, 0.8s on; 4s off
4
6
0.3s on, 0.2s off, 1s on, 0.2s off, 0.3s on; 4s off
Note: If all of these bits are "0" (off), any ring with a duration longer than 100 ms will be
accepted. Use this default if you do not have distinctive ring service.
If more than one type of Distinctive Ring is turned on, RING n will be reported for an
incoming ring signal where n is the ring type number.
10-8
Table 10-4 Ring Control
Special Functions
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