ZyXEL Omni 288S User Guide - Page 132

Electrically Programmable Read Only Memory. A memory chip which may

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Glossary other peripheral devices. You will not find any DIP switches in ZyXEL modems. ZyXEL modems let you perform all settings from the front panel or through command sequences. DLE: The ASCII code that is used in voice data mode to separate data segments from command segments. DSP: Digital signal processor. ZyXEL modems are equipped with this/these device(s). DSPs generate, process and analyze all signals. DSR: Data Set Ready - a control signal line of the RS-232C standard. DTE: Data Terminal Equipment - a computer or a terminal. DTR: Data Terminal Ready - a control signal line of the RS-232C standard interface. Some computers set this signal when they are turned on, even if they are not able to receive data. Echo: For a modem user, echo has two meanings: A modem can return all received characters to its local terminal/computer so they can be seen on-screen. The other meaning of the term ``echo'' is that part of the analog signal the modem sent out is bounced back by the telephone network to the modem's receiver, mixing there with the remote modem's signal. EDR: Extended Distinctive Ring - A feature of ZyXEL modems which helps to distinguish between data, fax and voice calls. EEPROM: An Electronically Erasable and Programmable Read Only Memory. Such a device is used in ZyXEL modems to store settings and profiles. An EEPROM does not lose data when the modem is turned off. EIA: Electronic Industry Association (of North America); this organization was the first to draft a standard serial port (RS-232C). EPROM: Electrically Programmable Read Only Memory. A memory chip which may be programmed electronically, but must be exposed to ultraviolet radiation to be erased. Error correction: A method to compensate for errors which occurred in the transmission path. Error correction is done by the modems and is transparent to the DTEs. The most familiar correction methods are MNP5 and V.42bis. Fax: Long distance copy; facsimile - transfer of graphical data between two fax units. The graphical data is compressed during transfer (G3). FIFO-Buffer: First-in-first-out buffer. A buffer of this type is used in the 16550 type UARTs which allow higher data throughput rates on PCs. Firmware: The ZyXEL modems' system software is located in flash EPROMs. Depending on the size of the EPROM(s), some features may or may not be available. Flash: See Hook-Flash. Flow control: Method to stop and start the data flow to avoid loss of data. Front panel: The front panel on the ZyXEL modems consists of LED indicators and key switches. Some models also feature a 20 2 liquid crystal display (LCD). FSK: Frequency Shift Keying - a frequency modulation scheme. D-3

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Glossary
D-3
other peripheral devices. You will not find any DIP switches in ZyXEL modems. ZyXEL
modems let you perform all settings from the front panel or through command sequences.
DLE
: The ASCII code that is used in voice data mode to separate data segments from
command segments.
DSP
: Digital signal processor. ZyXEL modems are equipped with this/these device(s).
DSPs generate, process and analyze all signals.
DSR
: Data Set Ready - a control signal line of the RS-232C standard.
DTE
: Data Terminal Equipment - a computer or a terminal.
DTR
: Data Terminal Ready - a control signal line of the RS-232C standard interface.
Some computers set this signal when they are turned on, even if they are not able to
receive data.
Echo
: For a modem user, echo has two meanings: A modem can return all received
characters to its local terminal/computer so they can be seen on-screen. The other
meaning of the term ``echo'' is that part of the analog signal the modem sent out is
bounced back by the telephone network to the modem's receiver, mixing there with the
remote modem's signal.
EDR
: Extended Distinctive Ring - A feature of ZyXEL modems which helps to
distinguish between data, fax and voice calls.
EEPROM
: An Electronically Erasable and Programmable Read Only Memory. Such a
device is used in ZyXEL modems to store settings and profiles. An EEPROM does not
lose data when the modem is turned off.
EIA
: Electronic Industry Association (of North America); this organization was the first to
draft a standard serial port (RS-232C).
EPROM
: Electrically Programmable Read Only Memory. A memory chip which may be
programmed electronically, but must be exposed to ultraviolet radiation to be erased.
Error
correction
: A method to compensate for errors which occurred in the transmission
path. Error correction is done by the modems and is transparent to the DTEs. The most
familiar correction methods are MNP5 and V.42bis.
Fax
: Long distance copy; facsimile - transfer of graphical data between two fax units. The
graphical data is compressed during transfer (G3).
FIFO-Buffer
: First-in-first-out buffer. A buffer of this type is used in the 16550 type
UARTs which allow higher data throughput rates on PCs.
Firmware
: The ZyXEL modems' system software is located in flash EPROMs.
Depending on the size of the EPROM(s), some features may or may not be available.
Flash
: See Hook-Flash.
Flow control
: Method to stop and start the data flow to avoid loss of data.
Front panel
: The front panel on the ZyXEL modems consists of LED indicators and key
switches. Some models also feature a 20 2 liquid crystal display (LCD).
FSK
: Frequency Shift Keying - a frequency modulation scheme.