Paradyne 8784 manual Glossary, 511, Bridged tap, COM port

Glossary

511	A random bit test 511 bytes in length.
AIS	Alarm Indication Signal. A signal transmitted downstream instead of the normal signal to
	preserve transmission continuity and to indicate to the rest of the network that a fault exists.
	Also called a Blue Alarm.
AMI	Alternate Mark Inversion. A line coding technique used to accommodate the ones density
	requirements of E1 or T1 lines.
ATI	Asynchronous Terminal Interface. A menu-driven, VT100-compatible system for configuring
	and managing the termination unit.
BPV	Bipolar Violation. In a bipolar signal, a one (mark, pulse) which has the same polarity as its
	predecessor.
bridged tap	Any part of the local loop that is not in the direct talking path between the CO and the
	service user.
CAP	Carrierless Amplitude and Phase Modulation. A transmission technology for implementing a
	DSL. Transmit and receive signals are modulated into two wide-frequency bands using
	passband modulation techniques.
CD	Carrier Detect. The received line signal detector. V.24 circuit 109.
CO	Central Office/Central Site. The PSTN facility that houses one or more switches serving
	local telephone subscribers.
COM port	Communications port. A computer's serial communications port used to transmit to and
	receive data from a modem. The modem connects directly to this port.
CP	Customer Premises.
CPE	Customer Premises Equipment. Terminal equipment on the service user's side of the
	telecommunications network interface.
CPU	Central Processing Unit. The main or only computing device in a data processing system.
CRC	Cyclic Redundancy Check. A mathematical method of confirming the integrity of received
	digital data.
CTS	Clear To Send. A signal indicating that the device is ready for the DTE to transmit data.
	Usually occurs in response to Request To Send (RTS).
CV	Code Violation. Detected when using HDB3 coding format, this is equivalent to a BPV when
	using AMI coding.
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.
DCLB	Data Channel LoopBack. Loops the data received from the network interface, for all DS0
	channels allocated to the selected port, back to the network.
DSL	Digital Subscriber Line. The non-loaded, local-loop copper connection between the
	customer and the first node within the network.
DSLAM	Digital Subscriber Line Access Multiplexer. A platform for DSL modems that provides
	high-speed data transmission over traditional twisted-pair wiring.

8784-A2-GB20-30 February 2001 GL-1