Telex NEO-10 technical manual Echo Packet

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3.6 Echo Packet

The Echo Packet function allows the system to operate on networks that do not support multicast. A typical application might be a number of radios spread throughout a network. Since multicast is not supported, the radio adaptors (IP-223s or C-6200s) are programmed to send packets to a specific static IP address; the IP address of the NEO-10 with Echo Packet enabled.

		Radio tower 2	Router
		Base:10.7.100.101
		RX: 10.6.100.202 - 1055
		TX: 10.6.100.202 - 1073
	NEO-10
	Base IP: 10.6.100.202
	Echo Packet Settings:
	1) 10.7.100.101-225.8.11.83-1055--10.7.100.101-225.8.11.83-1073
	2) 10.8.100.102-225.8.11.83-1056--10.8.100.102-225.8.11.83-1074
	3-10 are disabled.
		Private WAN	Router
Radio tower 1		Router	Radio tower 3
10.6.100.100			Base:10.8.100.102
225.8.11.83			RX:10.6.100.202 - 1056
RX:1054	Ethernet		TX:10.6.100.202 - 1074
TX:1072
	C-Soft	C-Soft
		10.6.100.201
10.6.100.200		225.8.11.83
Chan1: RX 225.8.11.83:1054 TX 225.8.11.83:1072		Chan1: RX 225.8.11.83:1054 TX 225.8.11.83:1072
Chan2: RX 10.8.100.201:1055 TX 10.8.100.201:1073		Chan2: RX 225.8.11.83:1055 TX 225.8.11.83:1073
Chan3: RX 10.8.100.200:1056 TX 10.8.100.200:1074		Chan3: RX 225.8.11.83:1056 TX 225.8.11.83:1074

Figure 6-Echo Packet Setup Example

The Example shown in Figure 6 shows a typical usage of the NEO in an echo packet configuration. It shows three radios, two of which are on other subnets. Since multicast is assumed to be blocked, only unicast UDP is available to get audio two and from Radio Towers 2 & 3. The two C-Softs on the 10.6 subnet are able to monitor and control Radio Tower 1 using multicast. However to reach Radios 2&3 the C-Softs send their traffic to the multicast address, which the NEO then translates and sends as unicast to Radio 2 or 3. Receive traffic from Radios 2&3 are sent directly to the NEO which then translates the packets back to multicast so each of the C-Soft consoles can monitor the RX audio. This enables NEO to function as a gateway for other consoles on the same local network segment. The local consoles transmit and receive the multicast address only and NEO translates and sends the packets to the radio directly.

The setup parameters shown for each device on the network are an example only. The parameters of the NEO are delineated by a dash between each value. The values correspond to the entry fields, per line, of the NEO setup screen shown in Figure 7. Note that RX traffic is a single direction copy. Packets received are copied only to the RX MCast address. Note that traffic received to the RX multicast address will be recopied back out. Since there should only be one receive source on the network for a given channel, this should not present a problem. This is depicted by the arrow at the top of the Rx columns. TX traffic is bi-directional. Traffic received as multicast is sent to the unicast address and traffic received as unicast is copied to the multicast address. The ports are still used to delineate channels. Unused ports should not be enabled.