POE-VOICE-RD Silicon Laboratories Inc, POE-VOICE-RD Datasheet - Page 20

• Manufacturer Part Number: POE-VOICE-RD
• Description: KIT REF DESIGN PWR OVER ETHERNET
• Manufacturer: Silicon Laboratories Inc

Specifications of POE-VOICE-RD

• Main Purpose: Reference Design, Power Over Ethernet , Voice Transmission
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: C8051F340, CP2201, Si3400
• Primary Attributes: Embedded Ethernet, Power over Ethernet, 8 kHz Voice Sampling System
• Secondary Attributes: Graphical User Interface
• Processor To Be Evaluated: C8051F340
• Interface Type: Ethernet
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 336-1326

PoE-VOICE-RD
Selecting an IP Address for the Embedded System
For a PC to recognize an embedded system on a network, its IP address and subnet mask need to be configured.
Below are a few guidelines to follow when choosing an IP address for the embedded system. Figure 23 shows an
example of a compatible PC and embedded system IP address combination.
IP Address Selection Example
The example in Figure 23 shows the IP address and subnet mask of the PC we want to connect to the embedded
system. Since the first 24 bits of the subnet mask are 1, the first 24 bits of the embedded web server’s IP address
(shown in bold) must match the PC’s IP address. Only the least significant 8 bits may vary making the valid range
of IP addresses for the embedded web server 10.10.10.0 to 10.10.10.254 with the exception of 10.10.10.80 since
this address is already taken by the PC. 10.10.10.255 is reserved because it is the broadcast address for this
network.
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1. Find the IP address and Subnet mask for the PC. If a Default Gateway is specified, then save this address
2. The IP address chosen for the embedded system must match the PC’s IP address in all bit locations where
3. Do not duplicate IP addresses or select a broadcast address. An IP address is considered a broadcast
4. The address 255.255.255.255 is known as the Ethernet broadcast address and is used when the Subnet
for later use. If you are using a crossover cable, you may choose any IP address for your PC as long as the
Subnet mask allows it to recognize the embedded system.
the Subnet mask is a 1 in order for the PC to recognize the embedded system. Otherwise, the PC will send
it’s request outside the local network.
address if all bits which are 0 in the Subnet mask are 1 in the IP address. Broadcast addresses with addi-
tional 1s such as 10.10.255.255 (Figure 23) can be broadcast to nodes outside the local network.
mask for the network is not known. Any packet transmitted to this address will reach all nodes on the local
network but cannot go further than the nearest router.
PC IP Address
PC Subnet Mask
Embedded Web Server IP Address
1111 1111 1111 1111 1111 1111 0000 0000
0000 1010 0000 1010 0000 1010 1010 0011
0000 1010 0000 1010 0000 1010 0101 0000
255
10
10
Figure 23. IP Address Selection Example
255
10
10
Rev. 0.2
255
10
10
163
80
0
(decimal)
(decimal)
(decimal)
(binary)
(binary)
(binary)