User`s guide

GL-1
7800-A2-GB26-80
May 1999
Glossary
A test pattern consisting of a one (1) followed by seven zeros (on the network only).
A random bit test 511 bytes in length.
ACCULINK Access Controller. A T1 product which permits connection to a variety of
network services.
An occurrence of interest within the network. Alerts include alarms and change of status
experienced by modems and data service units, as well as alarms experienced by
multiplexers, and event messages reported by multiplexers.
Alternate Mark Inversion. A line coding technique used to accommodate the ones density
requirements of E1 or T1 lines.
American National Standards Institute. A member of ISO, ANSI accredits and implements
standards.
ANSI specification that defines T1 operation.
Analog Private Line. The private circuit used for data transmission. Also called 4-wire
private line, private line, or leased line.
American Standard Code for Information Interchange. The standard for data transmission
over telephone lines. A 7-bit code establishes compatibility between data services. The
ASCII code consists of 32 control characters (nondisplayed) and 96 displayed characters.
A data transmission that is synchronized by a transmission start bit at the beginning of a
character (five to eight bits) and one or more stop bits at the end.
Asynchronous Transfer Mode. A high-speed, low-delay, connection-oriented switching and
multiplexing technique using 53-byte cells to transmit different types of data
simultaneously.
AT&T specification that defines T1 operation.
Bipolar 8 Zero Substitution. Encoding scheme for transmitting clear channel signals over a
T1 line.
A unit of signaling speed that is equal to the number of symbols per second. This is not
necessarily the same as bits per second, although the terms are frequently interchanged.
Bit Error Rate. The number of bits in error over a given period compared to the number of
bits transmitted successfully.
Bit Error Rate Test. A local pattern test used to analyze the network circuit that causes the
device to transmit and monitor for a test pattern. Both the control and tributary devices
must be connected to the network.
Bursty Error Seconds. A second in which more than one but less than 320 CRC6 error
events have occurred.
Binary digit. The smallest unit of information, representing a choice between a one or a
zero (sometimes called mark or space).
Bits per second. Indicates the speed at which bits are transmitted across a data
connection.
1-in-8 Test
511
AAC
alert
AMI
ANSI
ANSI-T1-403
APL
ASCII
asynchronous
transmission
ATM
ATT-54016
B8ZS
baud
BER
BERT
BES
bit
bps