Zypcom Z34-PC, User Manual

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Appendix D-2
D
DTE / DCE
DTE stands for Data Terminal Equipment and DCE
stands for Data Communication Equipment. The
Computer or terminal is the DTE and the modem is the
DCE.
DSP
Digital Signal Processor. It performs all digital signal
processing functions for the chipset, such as
modulation schemes and modem handshakes.
UART
UART (Universal Asynchronous Receiver Transmitter) is
the device used in DTE or DCE for asynchronous data
receiving and transmitting. The normal UART device
used in PC is NS16450. For high-speed serial data
receiving (38400 bps and up), the PC may not be fast
enough and data may get lost. In this case, a UART
with data buffer is needed, such as NS16550A.
NVRAM
NVRAM (Nonvolatile RAM) is a device to store the DCE
configuration. Upon powering-up, the modem defaults
to the configuration specified in the NVRAM or to the
factory default. DCE configuration can be changed and
stored by DTE in the NVRAM by first setting up the
current configuration and then sending an AT
command &Wn.
For example,
ATZ