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User's Guide for ZyXEL Omni 56K and Omni 56K Plus Modems
3-10
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 will not be answered by either fax machine or data
modem and it will only be answered when 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” 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 3-6 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
Table 8. Different Ring Types in Register S40
Security Function
The Omni modem provides a security function, that (when enabled) prevents an unauthorized user
from making a connection. Two types of security function are provided. Type 1 security is used
when the remote modem is also a ZyXEL modem; type 2 security is used when the remote modem
is any other brand of modem.