A process by which one or more of the less significant bits of all the samples stored in a packet are dropped to alleviate congestion. [T1.509-1995]

In a block, the ratio of the number of user information bits to the total number of bits.
Note: For a given block scheme, block efficiency represents the maximum possible efficiency for a given block scheme transmitted over a perfect transmission link.

A block within which at least one bit error occurs when the block is transferred from the source to the destination within the time slot assigned. [After T1.503-1996]

The Service Provider to which a thousands-block (NXX-X) has been assigned for use.

The number of data units, such as bits, bytes, characters, or records, in a block.

The designation of one or more bits in a block as parity bits used to force the block into a selected parity, either odd or even.
Note: Block parity is used to assist in error detection or correction.

The process, initiated by a single action, of transferring one or more blocks of data.

A coordinated sequence of user and telecommunication system activities undertaken to effect transfer of an individual block from a source user to a destination user.
Note: A block transfer attempt begins when the first bit of the block crosses the functional interface between the source user and the telecommunication system. A block transfer attempt ends either in successful block transfer… (Read More →)

The average ratio of user information bits to total bits in successfully transferred blocks.

Failure to deliver a block successfully.
Note: The principal block transfer failure outcomes are: lost block, misdelivered block, and added block.