HP 3162 DCE, DLB, DS0, DS1, DSR, DSU, DTE, DTR, EER, DTMF, GL-3, DSX-1, device, default, DevFail, diskette, download, DS1/E1 MIB, drop/insert, data carrier

Glossary

DB15 connector	A 15-position connector used on cables or devices.
data carrier	A continuous frequency signal that can be modulated by another signal that contains
	information to be transmitted.
DCE	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.
default	A factory-preset value that is assumed to be correct unless changed by the user.
DevFail	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.
device	A mechanical, electrical, or electronic unit with a special purpose.
digital signal	A signal composed of only two discrete values, representing the binary digits 0 and 1.
diskette	A thin, flexible magnetic disk enclosed in a protective jacket.
DLB	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.
download	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.
drop/insert	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.
DS0	Digital signal level 0 (zero). A 64 kbps digital telecommunications signal or channel.
DS1	Digital signal level 1 (one). A digital signal transmitted at the rate of 1.544 Mbps in North
	America.
DS1/E1 MIB	Defines objects for managing E1 interfaces and supports the network and G.703 DTE
	interfaces on the E1 NTU.
DSR	Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned
	ON and connected to the DTE.
DSU	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.
DSX-1	Digital Signal Cross Connect level 1. An interconnection point for terminals, multiplexers
	and transmission facilities.
DTE	Data Terminal Equipment. The equipment, such as a computer or terminal, that provides
	data in the form of digital signals for transmission.
DTE interface	The DTE interface on the rear panel of the CSU.
DTMF	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.
DTR	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.
E1	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.
EER	Excessive Error Rate. An error rate that is greater than the threshold that has been
	configured in the device.

3162-A2-GB20-40 August 2000 GL-3