The local access rate is the rate at which data travels into or out of
the network, regardless of other settings.
?– Virtual circuit (VC): Logical circuit, uniquely identi?¬?ed by a data-link connection
identi?¬?er (DLCI), that is created to ensure bidirectional communication from one DTE
device to another. A number of VCs can be multiplexed into a single physical circuit
for transmission across the network. This capability can often reduce the complexity
PVC
PVC
Router B
Router A
Router C
DLCI: 200
DLCI: 100
DLCI: 500
DLCI: 400
Local Access
Loop = 64 Kbps Local Access
Loop = T1
Local Access
Loop = 64 Kbps
LMI
100 = Active
400 = Active
Establishing a WAN Connection with Frame Relay 327
of the equipment and network that are required to connect multiple DTE devices. A VC
can pass through any number of intermediate DCE devices (Frame Relay switches). A
VC can be either a permanent virtual circuit (PVC) or a switched virtual circuit (SVC).
?– Permanent virtual circuit (PVC): Provides permanently established connections that
are used for frequent and consistent data transfers between DTE devices across the
Frame Relay network. Communication across a PVC does not require the call setup
and call teardown that is used with an SVC.
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