Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 125)

Acronyms and Definitions
Verilink Access System 2000: Basics Glossary-5
bidirectional A qualification implying that the
transmission of information occurs
in both directions. If this two-way
transmission happens
simultaneously, it is called “full-
duplex”.
binary code A representation of data using bits
in values of one and zero.
bipolar An electrical signal with negative
and positive polarity. For example,
consecutive ones pulses is a
bipolar signal. Bipolar is a coding
method used for digital E1 or T1
transmission services.
binary eight-zero substitution (B8ZS) A T1 line coding protocol that
replaces eight consecutive zero
bits with two intentional bipolar
violations (BPV) not counted as
errors. B8ZS enables each DS0 to
transmit at 64 kbit/s with
unlimited zeros. See Digital
Signal Level 0 .
bipolar three-zero substitution (B3ZS) A line coding protocol that
replaces four consecutive zeros
with an intentional bipolar
violation (BPV) pattern not
counted as an error. This
preserves a minimum pulse
density. Used in DS3 and E1
carriers (called HDB3 in E1).
bipolar violation (BPV) A fault of the T1 or E1 bipolar
alternate mark inversion (AMI) line
coding. Consecutive “ones” pulses
are transmitted as pulses of like
polarities rather than the correct
alternating polarities. BPVs
normally indicate transmission
errors; however, B8ZS and HDB3
line coding contain intentional
BPVs, which are not counted as
errors.
bipolar violation count The number of bipolar violation
(BPV) occurring over a specified
time interval.
bit A binary digit, either zero or one.