DB101 ADSL MODEM Manual
- 2 -
1. OVERVIEW
1.1 ABOUT ADSL
An ADSL MODEM is a broadband access device, which utilizes the high frequency segment of a phone
line to transmit high-speed data without interfering with the voice transmission. The frequency of the ADSL
signal is higher than that of voice, so the voice and ADSL signal can coexist in one line by using a Splitter to
insulate the two. ADSL data transfer adapts asymmetry model. It has an upstream maximum transmission rate
of 1 Mbps and downstream maximum transmission rates of 8 Mbps. This ability makes ADSL an ideal device
for broadband access.
1.2 DEVICE INTRODUCTION
1
2
3
4
Figure 1
POWER indicator
LINK indicator
USB port
LINE
port
1.3 PROTOCOL AND DRIVER
1.
PPP over ATM (PPPoA) VCMUX
(RFC2364)
2.
PPP over ATM (PPPoA) LLC
(RFC2364)
3.
PPP over Ethernet (PPPoE) LLCSNAP (RFC2516)
4.
PPP over Ethernet (PPPoE) VCMUX (RFC2516)
