Specifications

Functional Description
RADring
Installation & Operation Manual
2-6 Radring Functional Description - Token Ring 3/11/98 12:33
Multiple Hub
Configuration
Several RADring hubs can be connected together to form a single large ring,
by connecting Trunk cables between ring in and ring out ports of adjacent
hubs/access units. RADring RI/RO or repeater modules provide automatic
cable break protection. Distances between hubs are defined by the type of
RI/RO or repeater module being used, and the media quality.
CH1 CH2
CML/NM
RESET
CH1 CH2
CML/NM
RESET
CH1 CH2
CML/NM
RESET
RI
RI
RI
RO
BACKUP
BACKUP
BACKUP
MAIN
MAIN
MAIN
RO
RO
Figure 2-6 Multiple Hubs
Sattelite
Configuration
Connection of RADring hubs RI modules TFC, TCR or TFR to the lobe of a
central access unit enables a hierarchical star topology. This topology
provides central connection of dispersed hubs.
The module (TFR, TCR or TFC) on the RI of the satellite hub monitors the
satellite hub in order to recognize the insertion of at least one station into a
lobe port. If no station is inserted into the satellite hub the RI module does
not request insertion into the central access unit/hub.
Upon insertion of at least one single station into the satellite, the RI module
requests insertion into the ring.
For added fault tolerance the RR-TFC2 provides redundant connection of
the satellite to the central hub, so that if one link fails the second
automatically takes over.
In the case of all stations on the satellite becoming inactive the RI module
will exit the central hub.
Design information for satellite configuration is given in Chapter 6.
Note
A satellite connected hub can't be cascaded to another access unit by RO to
RI connection. Only one hub can be connected by satellite connection to a
port in the primary ring.