Omni 56K USB Lite
Glossary
I
DSLAM
A Digital Subscriber Line Access Multiplexer (DSLAM) is a network device,
usually at a telephone company central office, that receives signals from
multiple customer Digital Subscriber Line connections and puts the signals on a
high-speed backbone line using multiplexing techniques. Depending on the
product, DSLAM multiplexers connect DSL lines with some combination of
asynchronous transfer mode (ATM), frame relay, or IP networks.
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
Originally, the DTE (data terminal equipment) meant a dumb terminal or printer,
but today it is a computer, or a bridge or router that interconnects local area
networks.
DTMF
Dual Tone Multi-Frequency. The technology used in pushbutton telephones,
commonly known as touchtone, of generating audible notes to represent
numbers.
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 that 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).
EMI
ElectroMagnetic Interference. The interference by electromagnetic signals that
can cause reduced data integrity and increased error rates on transmission
channels.
