Classe Audio CAM-200 User's Guide Page 166

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Possible Network Configurations
7-4
Chapter 7
2- A Broadband (DSL or Cable) Modem Only
This scenario is where a Broadband connection is available for use exclusively by the Sorenson
VP-200 (that is, no PCs or other devices will be connected to the Broadband modem).
Recommended Procedure
Many ISPs act as DHCP servers and will dynamically assign a public IP address whenever the
modem requests one. If your ISP has a DHCP server, select the Automatically obtain IP
address checkbox on the Network Address screen. By choosing this option, you will not be
required to know the IP address, Gateway, Subnet Mask, or DNS numbers because these fields
will all be automatically filled by the DHCP server.
If your ISP does not provide DHCP service, you will have to enter numbers in all of the fields on
the Network Address screen. In this case, you will have to get the IP address, Subnet Mask,
Gateway, and DNS numbers from your ISP. This information will most likely have been provided
to you on a written statement from the ISP at the time your contract started with the ISP.
Potential Issues
The Sorenson VP-200 requires a “Public” (also called a “Static”) IP address to properly function.
If your ISP acts as a NAT (which means that it uses “Private” IP addresses), you have to request
that your ISP provide you with a “Public” (“Static”) IP address for use with the Sorenson VP-200.
3- A Broadband Modem, One PC, and a Hub
This is a common scenario found in a home or home office. One PC is connected to a
Broadband modem (DSL or Cable) but without a router/gateway. The VP-200 must be
connected to the modem and the PC through a network “hub” in order to work.
Recommended Procedure
If you will not be using a home router/gateway, you must request an additional “Public” (“Static”)
IP address from your ISP (that is, one in addition to the one assigned to your PC). With a
second Public (Static) IP address, the videophone can be made “visible” to the Internet. Your
ISP can either give you a “Static” IP address to be used with the VP-200 or allow you to
dynamically request a new “Private” IP address through DHCP each time it makes a new
connection to the Internet. Follow the specific instructions given under the “Broadband (DSL or
Cable) Modem Only” heading, above, depending on what your ISP supports.
Because most Broadband modems have only one Ethernet port, it will be necessary to install an
Ethernet hub between the modem and the rest of the network. Using an Ethernet cable, connect
the modem’s Ethernet port to the applicable WAN port on the hub. Then, plug the Ethernet
cables from the PC and the Sorenson VP-200 into any available local port on the hub.
If obtaining an additional Public IP address is not an option, the best solution is to use a router.
Refer to the “Local (Home) Router/Gateway” heading on the previous page for detailed
instructions.
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