Paradyne 8777, 8747, 8779 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.
BER	Bit Error Rate. The number of bits in error over a given period compared to the number of
	bits transmitted successfully.
BES	Bursty Error Seconds. A second in which more than one but less than 320 CRC6 error
	events have occurred.
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.
CAS	Channel Associated Signaling. A type of signaling in which the state of the circuit is
	denoted by status bits appropriated from information packets. Also called Robbed Bit
	Signaling.
CCS	Common Channel Signaling. A type of signaling in which a group of circuits share a single
	reserved signaling channel.
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.
CSS	Controlled Slip Seconds. A period in which a frame was added or deleted because of a
	variance in timing.

8700-A2-GB20-00 April 2000 GL-1