Token Ring network:-
IBM's implementation of the token-ring network architecture. It uses a token-passing protocol transmitting at 4 or 16 megabits per, second. Using standard telephone wiring, a Token Ring network can connect up to 72 devices: with shielded twisted-pair (STP) wiring, each/ ring, can support up t 256 nodes. Although it is based on a Closed-loop ring structures, a Token Ring network uses a star shaped cluster of up to eight nodes, all attached to the same wiring concentrator or Multistation Access Unit (MAU). The MAUs are then connected to the main ring circuit.
A Token Ring network can include personal computers, mini computers, and mainframes. The IEEE 802.5 standard defines token-ring networks.
Token-Ring Network:-
A local-area network (LAN) with a ring structure that uses token passing to regulate traffic on the network and avoid collisions. On a token-ring network, the controlling NIC generates a token that controls the right to transmit. This token is continuously passed from one node to the next around the network. When a node has information to transmit, it captures the token, sets its status to busy, and adds the message and the destination address. All other nodes continuously read the token to determine if they are the recipient of a message. If they are, they collect the token, extract the message, and return the token to the sender. The sender then removes the message and sets the token status to free, indicating that1 it can be used by the next node in sequence.
Topology:-
The map of a network. Physical topology describes where the cables are run and where the workstations, nodes, routers, and gateways are located. Networks are usually configured in bus, ring, star, or mesh topologies. Logical topology refers to the paths that messages take to get from one user on the network to another.
Transceiver:-
A contraction of TRANSMITTER/ RECEIVER. A device capable of both transmitting and receiving data. The data may be located on the network interface card that connects a workstation to a network, or it may be on a separate device. A transceiver can convert between an AUI (Attachment Unit Interface) Ethernet connection and another type of cabling, such as fiber-optic, coaxial, or unshielded twisted pair (UTP).
Transport Layer:-
The fourth of seven layers of the ISO/OSI model for computer-to-computer communications. The transport layer defines protocols for message structure and supervises the validity of the transmission by performing some error checking.
Twinaxial Cable:-
A cable with two coaxial cables inside a single insulating shield: see the accompanying illustration. Twinaxial cable is used with IBM AS/400 minicomputers.
Twisted-pair Cable:-
Abbreviated TP. Cable that comprises two or more pairs of insulated wires twisted together, at six twists per inch. In twisted-pair cable, one wire carries the signal and the other is grounded. The cable may be shielded or unshielded. Telephone wire installed in modem buildings is often twisted-pair wiring. |
