An interface protocol for statistically multiplexed packet-switched data communications in which (a) variable-sized packets (frames) are used that completely enclose the user packets they transport, and (b) transmission rates are usually between 56 kb/s and
1. 544 Mb/s (the T-1 rate).
Note 1: In frame relay, (a) there is neither flow-control nor an error-correction capability, (b) there is information-content independence,… (Read More →)

A data unit exchanged at the user-network interface and having a format based on that defined in CCITT Recommendation Q.921 (1988) (ANSI T1.602). [T1.606-1990]

The data unit exchanged at the functional boundary between the core function of Q.921 and the end-to-end protocol implemented above the core functions of Q.92
1. [T1.606-1990]

The number of octets after the address field and before the frame check sequence (FCS) field in a frame. The octet count is done either before zero-bit insertion or after zero-bit extraction. [T1.615-1992]

In the reception of framed data, the loss of synchronization between a received frame and the receiver clock, causing a frame misalignment event, and resulting in the loss of the data contained in the received frame.
Note: A frame slip should not be confused with a dropped frame where synchronization is not lost, e.g., in the case of buffer overflow.

Of a received stream of framed data, the process by which incoming frame alignment signals, i.e., distinctive bit sequences, are identified, i.e., distinguished from data bits, permitting the data bits within the frame to be extracted for decoding or retransmission.
Note: The usual practice is to insert, in a dedicated time slot within the frame, a noninformation bit that is… (Read More →)

In digital communications, a prescribed recurring pattern of bits transmitted to enable the receiver to achieve frame synchronization.

Synonym reframing time.

In the transmission of data frames, a distinctive sequence of bits used to accomplish frame alignment.
Note: A frame-alignment signal may also contain additional bits for status, control, and error detection.

A time slot occupying the same relative position in every frame and used to transmit the frame alignment signal. [T1.107-1988]