System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Ring polling
Aastra Proprietary Information Page 2-37
2.5.3 Ring polling
The ring polling mode permits data transmission between subscribers
connected to form a ring. In the ring polling mode, all subscribers are equal
in priority, i.e. there is no master station.
Data transmission takes place in a ring into both directions. Thus,
transmission is ensured even if one direction is cut.
Figure 2.18: Ring polling configuration
The subscriber is connected to converter n.
In the "Routing" section, "Ring polling" option must be selected.
In normal operation, i.e. as long as there is no polling requst, all converters
operate in the "Standard" mode. In this case, converter n is connected to
port a and port b.
Subscriber Subscriber Subscriber
Subscriber Subscriber Subscriber
n
Converter Converter Converter
Converter
Converter
Converter
PPPPPP
PP PP PP
Node 1 Node 2 Node 3
Node 6 Node 5 Node 4
n n
n n n