IC Realtime Max Series: 4/8/16 Channel D1 1.5U Standalone DVR - Manual (Page 141)

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Parameter Function
The read community will read all the objects the SNMP
supported in the specified name. The default setup is public.
Write Community It is a string. It is a command between the manage process
and the proxy process. It defined the authentication, access
control and the management relationship between one proxy
and one group of the managers. Please make sure the device
and the proxy are the same.
The read community will read/write/access all the objects the
SNMP supported in the specified name. The default setup is
write.
Trap address
The destination address of the Trap information from the
proxy program of the device.
Trap port
The destination port of the Trap information from the proxy
program of the device. It is for the gateway device and the
client-end PC in the LAN to exchange the information. It is a
non-protocol connection port. It has no effect on the network
applications. It is a UDP port not TCP port. The value ranges
from 1 to 165535. The default value is 162.
SNMP version
z Check V1, system only processes the information of V1.
z Check V2, system only processes the information of V2.
z Check SNMP V3.you can set user name and password.
There is account security verification when the server
wants to connect to the device. At the same time, the v1
and V2 is null and can not select.
7.8.2.11 Multicast
The multicast interface is shown as in Figure 7-36.
Multicast is a transmission mode of data packet. When there is multiple-host to receive the same
data packet, multiple-cast is the best option to reduce the broad width and the CPU load. The
source host can just send out one data to transit. This function also depends on the relationship
of the group member and group of the outer.
Figure 7-36
7.8.2.12 Alarm Centre