Prestige 153X Supplement
User's Guide Supplement
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The Prestige 153X now supports Frame Relay! You may have up to 6 simultaneous frame relay connections
i.e., 3 PVCs on WAN port 1or 2. Each PVC has its own encapsulation type, DLCI (Data Link Connection
Identifier), CIR (Committed Information Rate) and EIR (Excess Information Rate). When frame relay is not
used, the WAN port can also be configured to run PPP over HDLC on a leased-sync line. The
Connection
Type
must be set to
Leased-Sync
to configure Frame Relay (so only P153X WAN ports 1 and/or 2 may be
used). Each of these ports can be configured as either the network side or the user side of the UNI interface.
The options for the
Connection Type
field are shown in the following table. UNI (User Network Interface)
defines the connection between user equipment and the Frame Relay network.
Network
Frame relay is configured as the network side of the UNI interface.
User
Frame relay is configured as the user side of the UNI interface.
Connectio
n
Ty
p
e
None
Runs PPP over HDLC without frame relay on a leased-sync line.
1.1 What is Frame Relay?
This is some background information on frame relay. Please skip ahead if you wish to begin configuring your
Prestige for Frame Relay right away.
Frame relay is a form of packet-switching technology that routes frames of information from source to
destination over a switching network owned by a carrier. Suppose a corporate network has 4 sites, site A, site
B, site C and site D (as shown in the next figure) and you need to interconnect these sites with both data links
and voice lines. As data traffic is relatively continuous throughout the day one solution (though inefficient)
would be to set up dedicated leased lines connecting each office as shown in Figure 1.
Figure 1
Dedicated Leased Lines – Multiple Sites
