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2. System Description 
27  
© 2007 Moseley, Inc.  All Rights Reserved. 
602-14886-01, Rev. A 
HD to be configured in a protected ring configuration where the STP will prevent an 
Ethernet loop in the ring. This will also allow the ring to re-configure in the event of an 
outage. The Event-HD acts as a network bridge via the Ethernet switch and STP. The 
Event-HD does not currently support NMS routing capability. 
2.14.3NMS Network Operational Principles 
The Event-HD does not provide routing capability. Therefore, all Event-HD radios must be 
on the same subnet as the PC being used to access the Event-HD radios. If the Event-HD 
radios and/or the PC are on different subnets, a router must be used, with the gateway 
addresses set appropriately. Figure 2-14 shows the PC and both Event-HD SDIDUs™ in 
the same subnet. In this case, no router is required. Figure 2-15 shows the PC and one 
of the Event-HD SDIDUs™ in one subnet and the other Event-HD SDIDU™ in another. In 
this case, a router is required. Note how the GW addresses are set to allow 
communication from the PC to the Event-HD SDIDU™ in the other subnet. 
 
Figure 2-14. PC and Event-HD SDIDUs™ on Same Subnet 
SUBNET 1
PC
IP: 192.168.1.10
GW: 192.168.1.1
SWITCH
SUBNET 2
ROUTER
IP1: 192.168.1.1
IP2: 192.168.2.1
SDIDU
TM
IP: 192.168.1.21
GW: 192.168.1.1
SDIDU
TM
IP: 192.168.2.33
GW: 192.168.2.1
 
Figure 2-15. Event-HD SDIDUs™ on Different Subnets 
2.14.4Third Party Network Management Software Support 
The Event-HD SDIDU™ supports SNMPv1, SNMPv2, and SNMPv3 protocols for use with 
third party network management software. The SNMP agent will send SNMP traps to 
specified IP addresses when an alarm is set or cleared. Information contained in the trap 
includes: