Architectural Overview
Élan™SC520 Microcontroller User’s Manual 1-9
keyboard and mouse commands upstream and transmits video BIOS calls downstream.
The thin client renders and displays the graphics for the user.
The thin client is typically connected to an Ethernet LAN, although a remote location can
connect to a server via a WAN connection such as a modem. A minimum speed of 24 kbaud
is required for the communication protocol, unless the application is graphics-intensive, in
which case a faster connection is required.
1.4.3 Digital Set Top Box
Figure 1-4 on page 1-12 shows an ÉlanSC520 microcontroller-based digital set top box
(DSTB), which is a consumer client device that uses a television set as the display. Common
applications for the DSTB are internet access, e-mail, and streaming audio and video
content.
The minimal system includes a connection to the WAN via a modem, ADSL, or cable
modem; an output to a TV; and an InfraRed (IR) link to a remote control or wireless keyboard.
Expanded systems include DVD drives and MPEG2 decoders to deliver digital video
content. A hard drive may be employed to store video data for future replay. Keyboard,
mouse, printer, or a video camera are options that can be included.
1.4.4 Telephone Line Concentrator
Figure 1-5 on page 1-13 shows an ÉlanSC520 microcontroller-based telephone line
concentrator located in the neighborhood that converts multiple analog subscriber loops
into a high-speed digitally multiplexed line for connection to the central office switching
network.
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