b3zs

B3ZS is an abbreviation for bipolar with three-zero substitution, a T-carrier line code in which bipolar violations are deliberately inserted if the stream of user data contains a string of 3 or more consecutive zeros. B3ZS is used to ensure a sufficient number of transitions to maintain system synchronization when the user data stream contains an insufficient number of "ones" to do so. B3ZS is generally used on T3 lines as per North American hierarchy.

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bipolar signal
bit count integrity
bit error ratio
bit inversion
bit pairing
bit robbing
bit sequence independence
bit slip
bit stream transmission
bit stuffing
bit synchronous operation

black facsimile transmission
black noise
black recording
blind transmission
block
block check character
blocking
block transfer attempt
bonding
branch
brewster's angle

bridge to bridge station
bridging loss
brightness
b6zs
buffer
burst switching
burst transmission
busy hour
busy signal
busy verification
bypass

cable television relay service station
call
call collision
call delay
call duration
called party camp on
calling party camp on
call management
call processing
call second
call set up time