Specifications

Cascade Modem Manual

Page 9

2.3. Modulation/Demodulation

The modem Modulation/Demodulation uses an industry standard modem chip set which has been adapted for use

with Cascade Modem. The Modulation/ Demodulation supports the following industry modem standards:

V21 - V.21 (300 bps)

V22 - V.22 (1200 bps)

V.22B - V.22bis (1200 or 2400 bps)

V32 - V.32 (4800 or 9600 bps)

V32B - V.32bis (4800 to 14,400 bps)

V34 -V.34 (16,800 to 33,600 bps)

V90 - V.90 (to 56,000 bps)

2.4. Error Correction/Data Compression

The modem supports the following error correcting protocols:

V.42 LAPM

MNP 2-5

The modem supports the following data compression protocols:

V.42bis

MNP5

This allows data transmissions from the DTE at up to 115.2K. These DTE speeds are supported by the modem

serial interface with auto baud capability. Note the maximum speed is limited by the maximum speed available

from the DTE, up to 115.2kbps.

2.5. Non-Volatile RAM (NVRAM)

The modem stores the default settings in NVRAM to protect against failure on power loss or surges. The Cascade

modem can store a default setup (done at the factory) to load when first powered. This factory default can be

changed by the user with the following procedure. We do not recommend changing the default setup as it cannot

be recovered.

The XE5690SM allows a default command string to be automatically loaded into the modem on power-up or

modem reset. A series of commands loads the default command string in Hex form into the modem’s EEPROM.

The EEPROM has 256 bytes available for command storage.

The sequence to load the default commands into EEPROM must begin with the Boot command and ends with a

double carriage return. All commands are loaded into the EEPROM in Hex form beginning with address M0000.

Up to 8 addresses may be loaded with each command in the sequence.

The following example uses a typical configuration for an embedded application. ATE0 disables command echo;

ATQ1 disabled modem responses, and ATS0=1 sets the modem to automatically answer on the first ring. This

sequence is loaded into the modem EEPROM with the Boot command using the command sequence below. This

places the modem into the desired configuration each time power is applied or the modem is reset