This soft copy for use by IBM employees only.
from the root node to the leaf nodes and a
multipoint-to-multipoint connection. A
N
network node interface. The interface between two
ATM switches.
NTSC (National Television Standard Committee). Video resolution: 525 rows x 700 vertical lines, 29.97 frames per second, transmitted as {fields/frame. Used in US, Japan,parts of South Africa.
O
OSPF (Open Shortest Path first). A
P
packet. In data communication, a sequence of binary digits, including data and control signals, that is transmitted and switched as a composite whole. Synonymous with data frame.
In ATM, ªAn information block identified by a label at layer 3 of the OSI reference model.º
PAL (Phase Alternation by Phase). Video resolution:625 rows x 700 vertical lines, 25 frames per second.
Standard used in most the world.
PCMCIA (Personal Computer Memory Card
International Association). An association involved in establishing hardware standards that are often associated with miniaturized peripherals.
PVC (Permanent Virtual Circuit). A logical
connection between end stations, defined through administrator configuration, that is established at all times that the network is operational.
physical layer. In the Open Systems Interconnection reference model, the layer that provides the mechanical, electrical, functional, and procedural means to establish, maintain, and release physical connections over the transmission medium.
1.One ATM link, called the root link, serves as the root in a simple tree topology. When the root node sends information, all of the remaining nodes on the connection, called leaf nodes, receive copies of the information.
2.Each of the leaf nodes on the connection can send information directly to the root node. The root node cannot distinguish which leaf node is sending the information without additional (higher layer) information.
3.Leaf nodes cannot communicate directly with each other.
ATM Forum Phase 1 signaling does not support traffic sent from a leaf to the root.
port. (1) An access point for data entry or exit. (2) A connector on a device to which cables for other devices such as display stations and printers are attached. Synonymous with socket.
private network to network interface. The interface between two switches, or between a switch and a switching subsystem. Also known as the private network to node interface.
protocol. (1) A set of semantic and syntactic rules that determines the behavior of functional units in achieving communication. (2) In SNA, the meanings of and the sequencing rules for requests and responses used for managing the network, transferring data, and synchronizing the states of network components. (3) A specification for the format and relative timing of information exchanged between communicating parties.
protocol data unit (PDU). A unit of data specified in a layer protocol and consisting of protocol control information and layer user data.
R
RIP (Routing Information Protocol). A
S
SAP (Service Advertising Protocol). An IPX protocol used to advertise the location of available services.
SECAM (Sequentielles Couleurs Avec Memoire).
Video resolution: 625 rows X 700 lines, 25 frames per second.
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