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Glossary
GL-3
3162-A2-GB20-40
August 2000
A 15-position connector used on cables or devices.
A continuous frequency signal that can be modulated by another signal that contains
information to be transmitted.
Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required
for communication between the DTE and the network.
A factory-preset value that is assumed to be correct unless changed by the user.
Device Failure. A message that indicates that an internal failure has been detected by the
operating firmware. An 8-digit code appears for use by service personnel.
A mechanical, electrical, or electronic unit with a special purpose.
A signal composed of only two discrete values, representing the binary digits 0 and 1.
A thin, flexible magnetic disk enclosed in a protective jacket.
DTE Loopback. Loopback mode that loops the information received on the DTE T1
network interface back to the network as close to the network interface as possible.
A process that transfers device firmware and software from a locally-attached PC to a
device, or allows the duplication of firmware and software from a local device to a remote
device.
An interconnection point for terminals, multiplexers, and transmission facilities. Individual
channels may be inserted into the aggregate stream or dropped out to accommodate
specific applications.
Digital signal level 0 (zero). A 64 kbps digital telecommunications signal or channel.
Digital signal level 1 (one). A digital signal transmitted at the rate of 1.544 Mbps in North
America.
Defines objects for managing E1 interfaces and supports the network and G.703 DTE
interfaces on the E1 NTU.
Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned
ON and connected to the DTE.
Data Service Unit. Data communications equipment that provides timing, signal
regeneration, and an interface to data terminal equipment. A subrate DSU/CSU is normally
referred to as a DSU.
Digital Signal Cross Connect level 1. An interconnection point for terminals, multiplexers
and transmission facilities.
Data Terminal Equipment. The equipment, such as a computer or terminal, that provides
data in the form of digital signals for transmission.
The DTE interface on the rear panel of the CSU.
Dual-Tone Multi-Frequency. A signaling method using two voice frequencies to designate
the tones used for touch-tone dialing, as distinguished from pulse dialing.
Data Terminal Ready. A signal from the DTE to the modem, sent via Pin 20 of the
EIA-232 interface (V.24 circuit 108/1, /2), that indicates the DTE is turned ON and
connected to the modem.
A wideband digital interface operating at 2.048 Mbps, defined by ITU recommendations
G.703 and G.704. It is used primarily outside North America.
Excessive Error Rate. An error rate that is greater than the threshold that has been
configured in the device.
DB15 connector
data carrier
DCE
default
DevFail
device
digital signal
diskette
DLB
download
drop/insert
DS0
DS1
DS1/E1 MIB
DSR
DSU
DSX-1
DTE
DTE interface
DTMF
DTR
E1
EER