Specifications

AN93
Rev. 0.8 127
Country Configuration Tables
The country configuration tables separate countries into
groups. These groups include countries with the same,
or very similar, telecommunication requirements. The
modem default settings are for the US-like countries.
Many countries in all groups use at least some of the
default register settings. Default values do not have to
be written when configuring the modem to operate in a
particular country assuming the modem was reset just
prior to the configuration process. If the modem is being
reconfigured from one country to another without being
reset, default values may have to be rewritten to some
registers. To avoid confusion and possible errors, the
modem should be reset prior to reconfiguration between
countries.
Some countries have unusual requirements. For
example, registers U37–U40 set the number of pulses
to dial digits 0 through 9, respectively. By default, digit 1
has a setting of 1 pulse, digit 2 has a setting of 2 pulses,
and so on. Digit 0 has a setting of Ah (10 decimal)
pulses. This pulse arrangement is used nearly
universally throughout the world. However, there are
two exceptions: New Zealand and Sweden. New
Zealand requires ten pulses for 0, nine pulses for 1,
eight pulses for 2, and so on. Sweden, on the other
hand, requires one pulse for 0, two pulses for 1, and so
on.
Japan has a requirement for both the default 10 pps
pulse dialing and 20 pps pulse dialing. To configure the
modem for 20 pps, set U42 (PDBT) = 0x0022, U43
(PDMT) = 0x0010, and U45 (PDIT) = 0x0258. The %P
command may also be used.
The Netherlands has a unique dial tone filter. Other
countries, such as Japan, have special low-voltage loop
requirements. South Korea, Poland, and South Africa
have special ringer impedance requirements. Set all
country-specific parameters listed in the Country
Configuration tables beginning on 130.
Country Setting Update
There have been several recent changes to various
country requirements. This section summarizes these
changes. The +GCI commands will load the U-Register
values specified in the country tables beginning on page
130 into the modem and do not reflect the updates
below. In cases where a country now accepts TBR21,
use the values in the CTR/TBR21 table or the +GCI
command for a country that previously used that table
without modification for ATAAB notes. If you want to use
the +GCI command for a country and modify one or
more U-Registers, be sure to execute the +GCI
command first, then modify the desired register(s). The
+GCI command resets all U-Registers through U86, S6
and S7 to factory defaults before applying the country-
specific settings. Check with your compliance laboratory
to verify whether countries now accepting TBR21 still
accept their previous settings.
Countries now accepting TBR21 include the following.
Egypt
Hungary
Slovakia
A recent change to TBR21 drops the requirement for
loop current limiting. The set-up table on page 130 is
configured to enable current limiting. If you want to
disable loop current limiting, Change the setting for
U67(ILIM)[9] = 0b after the +GCI command.
Other country changes are as follows.
Brazil U67(DCV)[3:2] = 10b
China Accepts FCC settings
Kazakstan Accepts FCC settings
Russia Accepts FCC settings
South Korea U67(RZ)[1] =1b
Taiwan Accepts FCC settings
When using GOST settings for Armenia, Belarus,
Georgia, Kazakstan, Kyrgyzstan or Moldova set
U67(DCV)[3:2] = 10b.