A Closer Look At Cobranet; Fast Ethernet - Crown IQ-PIP-USP3 Reference Manual

Programmable input processor with tcp/iq

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four numbers (0-255) separated by periods. For example, a subnet mask of

255.255.255.0 and an IP address of 192.168.1.123 says that all IP address in that LAN

are in the IP address range of 192.168.1.1 to 192.168.1.255.

If a TCP/IQ controller is on a different network than the TCP/IQ components, communica-

tions must occur through an IP router. TCP/IQ Discovery requires the use of broadcast

Ethernet data packets onto the network. These broadcast commands cannot be done

through an IP router, therefore a Discovery Proxy is required. The establishment of this

proxy is done in TCP/IQ by naming the IP address of a known component on the compo-

nent network as the Discovery Proxy within IQWin.

5.3 A Closer Look at CobraNet

CobraNet is a licensed technology developed by Peak Audio, Inc. consisting of propri-

etary communications protocol, firmware and hardware. It allows reliable, deterministic

transmission of digital audio over a 100Base-T Fast-Ethernet network.

This section provides an overview of CobraNet. Peak Audio has provided a number of

technical papers that describe CobraNet in detail. These papers are available at:

http://www.PeakAudio.com/CobraNet/.

Figure 5.4 Star Network Topology

(100Base-T)

Fast Ethernet (100Base-T) uses a hub to interconnect all network nodes to form a star

topology (see Figure 5.4). In the star topology all PCs are connected to a centralized hub.

Messages are sent from the originating PC to the hub, which then transmits the message

either to the whole network or, if a switched hub is used, to the destination PC only. Hubs

may be active or switched.

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