Specifications

AN93
124 Rev. 0.8
Country Dependent Setup
Configuring the Si2493/57/34/15/04 for operation in
different countries is done easily with AT commands. No
hardware changes are required. For this reason, the
Si2493/57/34/15/04 is truly a global modem solution.
The U-Register values for various countries are
presented in the country configuration tables beginning
on 130. All U-Register values are in hexadecimal.
The settings for different countries can be broken into
three groups: Call Progress, Dialing, and Line Interface/
Control. Call Progress settings include filter coefficients,
cadence data, and threshold values. Dialing includes
DTMF levels, thresholds, and timing and pulse dialing
parameters. Line Interface settings include ac line
impedance, off-hook voltage and current characteristics,
ringer sensitivity, and transmit levels. CID (caller ID)
settings are discussed in a separate section.
Tables 93–95 list the registers and bits used for global
configuration and the functions performed by each.
Many countries use all or at least some of the default
FCC settings.
Blacklisting
Blacklisting in the Si2493/57/34/15/04 prevents dialing
the same phone number more than three times in three
minutes. An attempt to dial a fourth time within three
minutes results in a “BLACKLISTED” result code. If the
blacklisting memory is full, any dial to a new number
results in a “BLACKLIST FULL” result code. The
number of allowable calls may be adjusted in S43. If
S43 = 3, the third call in S44 seconds is blacklisted. The
blacklisting time may be adjusted with register S44
(second units). A number is added to the blacklist only if
the connection fails. The S42 register controls
blacklisting.
Any number that is currently blacklisted is reported with
the %B command.
Special Country Requirements for India
To output a 0 dBm sine wave, use the following
commands for Si2493/57/34/15/04 (revision A only):
AT:PF800, C4DD, 7B5C, 595F
AT*Y254:W50, 0, 5B86,1
AT:U46,0
AT*Y1X1DT1
This command string turns off the high-frequency DTMF
tone leaving you with a single (the DTMF low-
frequency) tone when an ATDT is sent. The tone is
output continuously until any key is pressed. To restart
the tone output, type AT*Y1DT1. To change the tone
power level, type ATU46,00X0 (where X is a hex value
0–F representing power in –dBm from 0 to –15 dBm,
respectively).
See the AT Command section beginning on page 4 for
additional information on the AT Command set and
writing and reading U and S registers.
Caller ID
The ISOmodem supports all major caller ID (CID) types.
CID is disabled (+VCID = 0) when the modem is in the
default state. Setting +VCID = 1 via the AT+VCID = 1
command enables decoded CID, while setting
+VCID = 2 causes raw caller ID data to be output. The
specific CID mode is selected by +VCDT, which is set to
the US Bellcore standard by default. The
“AT+VCDT = n” command is used to define the CID
mode according to the decimal values of “n” defined in
Table 91. U70[4] (CID) is a sticky bit that is set when a
CID preamble is received and cleared with an AT:I
(“Interrupt read”) command.
S42 Blacklisting
0 (default) Disabled
1 Enabled
AT Command Function
%B Report blacklisted number (if
any) followed by “OK”
Example: AT%B\r
5121234567
OK
Table 91. Caller ID Modes
n +VCDT Settings
0 After ring only (US Bellcore) default
1 Force CID monitor (always on)
2UK
3 Japan