Efficient Networks 5500 Series, 5400 Series, 5200 Series manual Technical Concepts

	SpeedStream Router User Guide
SSDP	Simple Service Discovery Protocols
Tx Cells	(ATM) Number of cells transmitted through the ATM layer to the wire.
Tx Errors	(ATM) Number of SDUs that could not be transmitted due to errors.
Tx Packets	(DSL, Ethernet, USB) Count of all encoded blocks transmitted on this channel
	since router reset.
Tx PDUs	(ATM) Number of PDUs transmitted on connection.
Unicast	Communication between a single sender and a single receiver across a network
VC	Virtual Channels
VCI	Virtual Channel Identifiers
VCMux	Virtual Channel Multiplexor
VPI	Virtual Path Identifiers

Technical Concepts

This section provides very brief descriptions of some of the features available on the SpeedStream Router.

AAL5 (ATM Adaption Layer 5)

AAL5 is a network layer for adapting data traffic into the format of ATM fixed-length packet networks.

ATM (Asynchronous Transfer Mode)

ATM is a fast, cell-based technology defined by the ITU-T. It works by taking an ordinary, variable- length data packet and segmenting it into 53-byte cells prior to transmission. The data is transmitted over virtual channels that are designated by specific unique identifiers (virtual channel identifiers or VCIs). There can be multiple VCIs in one virtual path. The virtual path also has a unique virtual path identifier (VPI). Data transmitted over ATM VCs is routed by ATM switches. At the destination node, the cells are reassembled into packets. Only one virtual path is supported on the device. In router mode, only one virtual channel is supported. However, in bridge mode, up to 16 virtual channels can be configured to be used as individual bridge ports.

Cloning IP Filter Rules

Defining a complete set of firewall IP filter rules can be a tedious process. To aide our SpeedStream router users, Efficient Networks includes the capability to “clone” an existing set of rules as a starting point in the process.

There are four preconfigured firewall levels: Low, Medium, High and ICSA-compliant. Each of these levels has its own set of predefined firewall rules. If you Want to create a set of Custom rules that are similar to one of the preconfigured levels, you can do this through cloning. When you clone one of the preconfigured levels, the new set of custom rules is an exact replica of the cloned level; only the rule numbers have been changed.

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