Table 7. Different Ring Types In Register S40 - ZyXEL Communications Omni 56K User Manual

User's Guide for ZyXEL Omni 56K USB Modem
Distinctive Ring
Distinctive Ring is a phone service that may be offered by your phone company. Check your
phone company for availability. With this service, you can have several phone numbers
assigned to the same phone line. The phone company sends a different type of ring signal for
each phone number being called. The subscriber can distinguish which number is called by
which type of ring is received.
One benefit of this feature is the ability to have three numbers on the same line allowing you to
list the three numbers for voice, data, and fax, respectively. You can then have your fax
machine answer only the ring corresponding to the fax number and have your modem answer
only the ring corresponding to the data number. A voice call is not answered by either fax
machine or data modem and it is answered only by picking 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 " enables answering, setting it to " 0 " 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 to 6 in register S40 and the different ring types are:
TYPE
1
2
3
4
3-10
Table 7. Different Ring Types in Register S40
BIT (ON)
3 1.2s or 2s on; 4s off
4 0.8s on, 0.4s off, 0.8s on; 4s off
5 0.4s on, 0.2s off, 0.4s on, 0.2s off, 0.8s on; 4s off
6 0.3s on, 0.2s off, 1s on, 0.2s off, 0.3s on; 4s off
RING SEQUENCE