SDLC (Synchronous Data Link Control):
A communications line discipline associated with the IBM systems
network architecture (SNA).
Each line item in a transaction set.
The act of (at least) signing on and signing offone's Mailbox. A
session may or may not include sending and/or receiving data to/from
the System. A session MUST end with the transmission (by the customer
of a Signoff record.)
SNA (Systems Network Architecture):
An architecture for interchanging data trough an SNA network in a
SNA/DS (System Network Architectural Distribution Services):
an E-mail messaging protocol that is used with many mainframe based
messaging systems. It operates over a dedicated line using the SNA
Store and Forward:
Service where a message carried by the network may be temporarily
sorted or routed in the network prior to delivery to the recipient.
A subset of a national standard for ease-of-use within one industry.
The subset usually indicates only those segments, elements, and code
values needed by the industry.
Data communications in which characters or bits are sent at a fixed
rate, with the transmitting and receiving devices synchronized;
eliminates the need for start and stop bits basic to asynchronous
transmission and significantly increases data throughput rates.
The rules governing the structuring of the user data and of associated
data in the interchange of messages.