ZyXEL Communications Prestige 681 Guía de usuario Pagina 42

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Prestige 681 SDSL Router
3-2 WAN Setup
Figure 3-2 Frame Relay Solution
Frames are “relayed” through switches in the network, creating basically a virtual private network (VPN)
between linked sites. This logical point-to-point circuit between customer sites is called a VC (virtual
circuit) of which there are two types. Permanent VCs (PVCs) have constant end points and need to be set up
in advance while switched VCs (SVCs) are set up on the fly as needed. The Prestige 681 supports PVCs
only.
3.1.1 Frame relay frame format
The frame format for frame relay is as follows.
Bytes
1 2-4 0-4,000 2 1
Flag Link Info Data FCS Flag
Upper DLCI (6 bits) C/R EA 0
Lower DLCI (4 bits) FECN BECN DE EA 1
Figure 3-3 Frame Relay Format
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