ZyXEL Communications 56K manual Distinctive Ring, Different Ring Types in Register S40

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 3-6are 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:

Table 7. Different Ring Types in Register S40

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

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