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Product Overview 24
Model 3086FR ATM IAD User Guide 2 • Product Overview
Product Overview
The Model 3086FR IAD operates as a Frame Relay to ATM converter (via serial port), as a bridge or a router
and has three ports for communication:
• The Ethernet port—Connects to the LAN side of the connection
• The Line port—Provides the G.SHDSL transmission connection between the CPE and CO DSL IAD
• The TDM port—Connects to local device for Frame Relay to ATM conversion and data uplink via the
DSL link
The IAD provides all layers 2 and layer 3 protocols required for end-to-end-link communication.
When configuring the 3086FR, questions must be answered so the 3086FR functions as desired. For example,
when a router or bridge module needs to be activated, some questions would be:
• Is a default gateway required?
• Which encapsulation technique is best for this application: PPPoA, IPoA, or another?
These decisions can be made and implemented more easily if the Model 3086FR’s fundamental architecture is
understood. Also, while configuring the Model 3086FR via a browser using the built-in HTTP server is very
intuitive, an understanding of the architecture is essential when using the command-line interface (CLI) com
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mands.
The fundamental building blocks comprise a router or bridge, interfaces, and transports. The router and bridge
each have interfaces. A transport provides the path between an interface and an external connection. For exam
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ple, the Ethernet transport attaches to an Internet Protocol (IP) interface. A transport consists of layer 2 and
everything below it. Creating a transport and attaching it to a bridge or router’s interface enables data to be
bridged or routed. The supported transports are PPPoA, RFC 1483 (Multiprotocol Encapsulation over ATM
AAL5), and IPoA.
Configuring an interface and transport for the router or bridge requires naming the interface and transport before
attaching them. When using the built-in HTTP server web browser, this is done automatically. But when config
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uring the Model 3086FR via CLI commands through the RS-232 control port, it must be done manually.
Model 3086FR IADs can connect over an ATM PVC transport.
The PVC requires the configuration of the virtual path identifier (VPI) and virtual circuit identifier (VCI). The
VPI can be any integer between 0–4095 inclusive. The general rule for the VCI is an integer between 1–65,535
inclusive. Examples in this manual use a VCI of 600 or above. The main restriction in choosing a VCI is that
VCIs below 32 are reserved for such predefined functions as ILMI. The VCI values of 600 and above used in
this manual are also above the range used by many signaling implementations for SVCs.
The HDLC is a packet-based transmission across the DSL Link.
Applications Overview
The Model 3086FR is used in FR over ATM applications connecting FRAD equipment to ATM based
DSLAMs. In addition, the 3086FR is used in the connection of small to medium size enterprise to internet
services (connection to ISP), or connection to remote branches using DSL access using PPP over ATM. In
most applications, the Model 3086 works with Patton’s 3096RC ForeFront System, but it will also connect to
third-party G.SHDSL devices.