Paradyne HotWire 7974 User Manual page 157

Glossary
511
AIS
AMI
ATI
BPV
bridged tap
CAP
CD
CO
COM port
CP
CPE
CPU
CRC
CTS
CV
DCE
DCLB
DSL
7970-A2-GB20-00
A random bit test 511 bytes in length.
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.
Alternate Mark Inversion. A line coding technique used to accommodate the ones density
requirements of E1 or T1 lines.
Asynchronous Terminal Interface. A menu-driven, VT100-compatible system for
configuring and managing the termination unit.
Bipolar Violation. In a bipolar signal, a one (mark, pulse) which has the same polarity as its
predecessor.
Any part of the local loop that is not in the direct talking path between the CO and the
service user.
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.
Carrier Detect. The received line signal detector. V.24 circuit 109.
Central Office/Central Site. The PSTN facility that houses one or more switches serving
local telephone subscribers.
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.
Customer Premises.
Customer Premises Equipment. Terminal equipment on the service user's side of the
telecommunications network interface.
Central Processing Unit. The main or only computing device in a data processing system.
Cyclic Redundancy Check. A mathematical method of confirming the integrity of received
digital data.
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).
Code Violation. Detected when using HDB3 coding format, this is equivalent to a BPV
when using AMI coding.
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.
Data Channel LoopBack. Loops the data received from the network interface, for all DS0
channels allocated to the selected port, back to the network.
Digital Subscriber Line. The non-loaded, local-loop copper connection between the
customer and the first node within the network.
August 1999
GL-1