Model 5399 RAC Digital Modem Configuration Notes
Setting Parameter Values
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In this example, when the 5399 RAC receives a call on a number that
ends with 103, the call is treated as a modem call, with a user-defined
modem type named credit_card. Before the modem answers the call, its
digital modem configuration parameters 16, 17, 18, and 19 are set to the
values 15, 15, 7, and 7, respectively. This sets the options Maximum Tx
Line Speed and Maximum Rx Line Speed to Speed 31200, and the options
Minimum Tx Line Speed and Minimum Rx Line Speed to Speed 4800.
Setting Parameter Values
You can modify a digital modem configuration parameter by specifying
the parameter number and its corresponding value in the
%digital_modem section of the config.annex file. You can modify a
series of parameters by specifying the number of the first parameter in
the series, then specifying the corresponding values for all of the
parameters in that series.
Each parameter’s value is a decimal , octal, or hexadecimal number that
is the equivalent of the parameter’s binary bit settings; the config_bytes
keyword does not use values expressed in binary. Decimal is the default
base for setting parameter values. If you set values in octal base, precede
them with “0”; if you set values in hexadecimal base, precede them with
“0x”. Each parameter value in a series may be set separately, so it is not
necessary to use the same base for a single series of configuration
parameters.
For example, the parameter map for Parameter 3 on page 11 shows that
the default setting for the parameter is 11101 expressed in binary; this
value is 29 expressed in decimal, 035 in octal, and 0x1D in hexadecimal.
Changing the MNP Frame Size option to Block Size 64 causes the bit
setting to be 00101, or 5 in decimal, 05 in octal, and 0x5 in hexadecimal.
The corresponding config_bytes entry in the %digital_modem section
looks like this (with the parameter’s value expressed in decimal base):
config_bytes 3 =5
