Network Device User's Guide Omni 56K Plus Series

Omni 56K Plus Series User’s Guide
2-8 Specifications and Function Description
Setting S48.0=1 will cause the modem to report CND information in its ASCII coded hexadecimal raw
data format. The DTE software is responsible for explaining the data.
 Please refer to the Bellcore Technical Advisory document TR-
NWT-000030 for the exact data format. The above Caller ID scheme
applies to the North America area. Different countries may employ
different Caller ID schemes, check if the scheme used in your
country is supported before using the Caller ID feature. For most
other Caller ID schemes, only the Caller telephone number is
provided.
2.5.10 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 will send 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 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:
Table 2-5 Different Ring Types in Register S40
TYPE BIT (ON) RING SEQUENCE
1
2
3
4
3
4
5
6
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
2.5.11 Security Function
The Omni 56K Plus 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