ZyXEL Elite 2864 User Guide - Page 144

A simple use of this feature is that you can have three numbers on the same line and you can 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. The 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. Or you can have the answering machine answer only the voice ring. A more complicated use is that you can have one number for several uses, e.g., 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. The 2864 series modems can distinguish between 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 in 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. Set the bit to "1" to enable answering, set it to "0" to reject 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 S40 and different ring types are: Type Bit 1 3 2 4 3 5 4 6 Sequence 1.2s or 2s on; 4s off. 0.8s on, 0.4s off, 0.8s on; 4s off. 0.4s on, 0.2s off, 0.4s on, 0.2s off, 0.8s on; 4s off. 0.3s on, 0.2s off, 1s on, 0.2s off, 0.3s on; 4s off. If all of these bits are zero (0), 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. Other countries may have different specifications for different types of ring. The manufacturer may append other sets of ring type specifications to suit other countries' needs. Extended Distinctive Ring Extended Distinctive Ring (EDR) is a special feature designed for single telephone line home use to receive fax or data calls without interfering with regular voice calls. Most users, when they install a fax/modem at home, won't subscribe to an extra 13-6