3Com 3C840 manual What is an Sdsl, Modem?, What is ATM?, What is Frame, Relay?

What is an SDSL Modem? 1-3

	protocols as well as bridging, with support for learning bridge and
	802.1d spanning tree functionality to eliminate loops. Other important
	features include: Routing Information Protocol (RIP), Simple Network
	Management Protocol (SNMP), address translation, telnet, and packet
	filtering. The web browser-based OfficeConnect Remote 840 Manager
	and the IP Wizard provide a user-friendly configuration interface.
	To simplify the installation process, the OfficeConnect Remote 840 can be
	initialized with pre-configured parameters using DIP switches located on
	the back of the unit. There are three operational modes: DHCP Smart
	Mode, Default Bridge Mode, and Unconfigured Mode.
What is an SDSL	An SDSL modem is a device that transmits and receives data through
Modem?	regular telephone lines at speeds that far exceed traditional analog
	modem technology.
	It allows your workstation to connect to a remote site using a network
	protocol such as IP or IPX. The OfficeConnect Remote 840 contains one
	SDSL modem port which is the WAN interface.
What is ATM?	Asynchronous Transfer Mode (ATM) is a modern networking technology
	that provides support for a wide variety of services and applications. The
	OfficeConnect Remote 840 provides support for ATM over SDSL.
	ATM is based on the transfer of fixed-length cells containing a header
	and an information field. The header is used to route the cells through
	the ATM network backbone.
	ATM defines connections by two main parameters, which are explained
	later in this Guide:
	■ Virtual Path Identifier (VPI)
	■ Virtual Channel Identifier (VCI).
What is Frame	Frame Relay is a framed-based technology that runs over HDLC (High
Relay?	Level Data Link Control). Virtual Circuits are defined which connect the
	OfficeConnect Remote 840 to up to 16 remote sites within a Frame Relay
	Network. Each Virtual Circuit is identified by a Data Link Connection
	Identifier (DLCI), which is included in the frame header.