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Chapter 3: Applications and Configuration Overview
Avidia System Configuration and Management User Manual 73
Connection Type Use This Setup
Frame Relay Select this connection type for modems using Frame Relay.
Step 1 Configure the frame relay link for each port, which involves setting the LMI (Local
Management Interface) parameters. The LMI type defines the method of
exchanging status information between the customer device and the network. The
available LMI types are:
• LMI Rev-1
• ITU 0.933 Annex-A
• ANSI T1 617 Annex-D
• no LMI support
Step 2 Configure the FRF.5 or FRF.8 circuit for each port. This includes creating the cross
connect through the Avidia system (from the line card to the IDSL frame card), and
configuring cell loss priority, congestion control, and the traffic type. The available
traffic types are:
• ubr (Unspecified Bit Rate)—This is a best-effort class of traffic that is best
suited for LAN. When network congestion occurs, the data is stored in a buffer
until it can be sent.
• cbr (Constant Bit Rate)—This traffic class carries a guaranteed constant
bandwidth. It is best suited for applications that require fixed bandwidth, such
as uncompressed voice, video, and circuit emulation. CBR is a Quality of
Service class defined by the ATM Forum for ATM network.
• nrt-vbr (non-real-time Variable Bit Rate)—This traffic class carries variable
bandwidth. It is well suited for data services such as frame relay over ATM
which requires guaranteed bandwidth and lower Quality of Service. It is not well
suited for LAN traffic due to the unpredictability of LAN traffic burst size.
• rt-vbr (real-time Variable Bit Rate)—This traffic class carries a variable
bandwidth. It is well suited for real-time services such as compressed voice and
video which require stringent cell transfer latency and less bursty traffic. It is
not well suited for LAN traffic due to the unpredictability of LAN traffic burst
size.
ATM VCC
Step 3
Select this connection type for modems that are not using Frame Relay but other
protocols such as PPP.
To connect to modems not configured with the frame relay protocol, add an ATM
VCC (see “Configuring PVCCs” on page 170 for the command-line interface or
“Configuring PVPCs” on page 433 for the Web interface). Adding a VCC includes
selecting the channel parameters (specific IDSL card, the port, the service type,
and the encapsulation method). The available encapsulation types depend upon
the service type you select and both must match the modem encapsulation type.