20 en | Ethernet network Modular fire panel
07.2019 | 5.9 | F.01U.247.450 Networking guide Bosch Sicherheitssysteme GmbH
LLDP
LLDP is a basic protocol standardized by the IEEE. It is used to share network information
between neighboring devices. This information is
– provided as part of the SNMP data
– displayed via the panel controller as part of the network diagnostic data
RSTP
RSTP is a network protocol standardized by the IEEE. RSTP ensures that there are no loops in
networks. Redundant paths are detected in the network, deactivated and activated when
necessary (failure of a connection).
The protocol is used for exactly this purpose in the network.
A change to the topology following the failure of a connection is automatically canceled once it
has been repaired.
5.2 Network diameter
The network diameter of RSTP Ethernet panel networks must not be greater than 32.
Definition
The diameter of a network corresponds to the number of RSTP switches on the longest
possible section without loops between any 2 end points in the network.
The following must be taken into account in relation to a RSTP Ethernet panel network:
– Each panel controller contains an end point and an internal RSTP switch.
– A combination of panel controller and redundant panel controller counts as just one RSTP
switch.
– Media converters are not regarded as RSTP switches.
– CAN connections may not be included in the longest possible section.
– OPC servers are not taken into account with respect to the diameter.
Key
Central processor in the panel controller or in the remote
keypad.
Internal RSTP switch in the panel controller or in the remote
keypad.
Panel controller or remote keypad with central processor and
internal RSTP switch.
Redundant panel controller with central processor and internal
RSTP switch.
Panel controller or remote keypad
Starting or end point for determining the network diameter in
the examples.
Ethernet switch as external RSTP switch (in general Ethernet
switch MM)
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