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APPENDIX C. EMERALD SE NETWORK PROTOCOLS OVERVIEW
Emerald SE uses standard IP protocols for communication between Receivers and Transmitters. Port 3389 is used for unicast
communications.
For management purposes some other ports are used. The Black Box Discovery protocol used UDP Multicast Group 224.0.1.249
(port 39150). This is sent by the Manager to discover Emerald SE devices in the network. The router must allow UDP Multicast
forwarding to allow devices on subnet different to where Manager is located to be discovered.
Emerald SE devices respond to the discovery multicast by sending a UDP unicast back to Manager IP address on the same port
(Port 39150).
Once an Emerald SE device is part of the managed domain, the Manager periodically “audits” the device to determine information
such as if the device on-line, who is logged into devices, device statistics, etc. These audit requests and responses are unicast
UDP to specific IP addresses (responses are sent back to Manager’s IP address) on port 39150.
On power-up, a Transmitter sends out a “here I am” multicast message on multicast group 225.0.0.37 on port 12345.
As part of management configuration, the Manager may communicate to a specific device on port 22 (TCP unicast
communications).
Emerald SE can operate across multiple VLANs or subnets. Basic IP networking rules need to be followed; there should be a router
in the network to enable the various devices on different subnets to communicate with each other.
To allow Black Box’s Emerald SE discovery protocol to operate, Multicast routing should be enabled. Black Box’s Emerald SE
“discovery” protocol is not required for Emerald SE systems to operate but it is recommended to enable an Emerald SE Manager to
search
for devices across the network. If the Emerald SE discovery protocol is not enabled, i.e. router does not have multicast routing
enabled, the administrator will have to manually add in all devices not on its subnet, i.e. add in each device individually
by its IP address.
