Zhone 6212-a2 ユーザーズマニュアル

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6212-A2-GB20-00                               May 2004                                                           93
 
data rate:
 The speed measured in bits per second that data is transferred 
over the carrier line.
 
Default:
 A pre-defined original value.
 
demodulation:
 The recovery, from a modulated carrier, of a signal.
 
DHCP server:
 A server that dynamically allocates network addresses and 
delivers configuration parameters to hosts.
 
DHCP:
 Dynamic Host Configuration Protocol. A TCP/IP protocol that enables a 
network connected to the Internet to automatically assign a temporary IP 
address to a host when the host connects to the network.
 
digital signal:
 
A discrete or discontinuous signal where the states are 
discrete intervals apart, such as +10 volts and –10 volts. These states are then 
represented by the binary digits 0 and 1.
 
digital: loopback test:
 A test that connects the device’s receiver 
output back to the transmitter input. This test will disrupt the transmission of 
primary data.
 
DLL:
 Dynamic Link Library. DLLs are files that are automatically loaded into 
memory when required.
 
DMT:
 Discrete MultiTone. The T1.413 standard modulation scheme for Digital 
Subscriber Line technology.
 
DNS:
 
Domain Name Server.  A server that retains the addresses and routing 
information for TCP/IP PAT users.
 
download: 
To receive a file over a network (compare with upload).
 
driver: 
A software module that provides an interface between a network 
interface card and the upper-layer protocol software running on a computer.
 
DSL:
  Digital Subscriber Line. A family of broadband services provided over a 
traditional phone line, such as ADSL, SHDSL, and VDSL.
 
DSP:
 Digital Signal Processor. The microprocessor that handles line signaling 
in a modem.
 
DTE:
 Data Terminal Equipment. Equipment that transmits or receives data in 
the form of digital signals.
 
dynamic detection:
 A process of a automatic detection of a new device 
added or removed from the PC.
 
EOC:
 Embedded Operations Channel. An in-band channel between DSL 
devices that operates at the physical layer for administration and maintenance 
data.