Ethernet modem is a device with an ADSL/VDSL interface and an Ethernet interface that can work in transparent bridge.
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Ethernet modem limitations: 
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The default IP address is 192.168.168.168/28.  | 
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The supervision must be done using Telnet or HTTP. The default user is admin and password is VuDi218.  | 
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Interesting chapters: Section 3.6, “Ethernet modem connection”; Section 80.8, “How to configure ADSL/VDSL connections using Ethernet modems”.  | 
| Led | Meaning | State | 
|---|---|---|
| Power state. | OFF: Power cable disconnected.  ON: Power cable connected and modem READY.  | |
| DSL state. | Slow Blinking: No DSL link. On: DSL link established and active. Quick Blinking: DSL is trying to establish a connection.  | |
| Data exchange. | On: IP connected.  Blinking: IP connected and IP traffic is passing through the device. Off: Modem power off or DSL connection not present. | |
| Ethernet data exchange. | LED indicator will light green when a device is connected. It flashes when data is being transmitted or received on the connection. |