Specifications

9032563 E1 Token Ring Application
7-1
Chapter 7
Token Ring Application
Token Ring and IEEE 802.5 are the primary examples of networks that use a ring-structured
topology and token-passing as the means of data transmission. This section describes the views
available for the Token Ring applications.
Token-passing networks use a small frame or token that moves around the network. In order for a
station to transmit it must have possession of the token. If a node in possession of the token has
no information to transmit, it passes the token on to the next end station in line. When a station
with the token does have information to send, it alters the token (which becomes a start-of-frame
sequence), appends the information, and transmits to the next station on the ring. The
information frame circles the ring until it reaches the intended destination.
During this transmission process, no token is available to other stations along the network
(unless the ring supports early token release, a process that allows a station to release the token
prior to final data packet removal) and stations with information to transmit must wait. Because
of this, no collisions can occur in Token Ring networks.
There are two Token Ring applications and corresponding model types:
• Token Ring App TokenRingApp
• Token Ring IF App TokenRingIFApp
Token Ring Views
One application-specific subview is available for the Token Ring application
from the TokenRingApp Icon, the Token Ring Detail View.