An ATM VC is a logical connection created between two ATM endpoints across an ATM
network. ATM VCs fall into the two categories of PVC and SVC. VCs provide a
bidirectional communications path from one ATM endpoint to another. The VPI/VCI
within the ATM cell header uniquely identi?¬?es the VCs.
A VC can pass through any number of intermediate ATM switches in the ATM network.
Numerous VCs can be multiplexed into a single physical circuit for transmission across the
network.
394 Chapter 5: WAN Connections
Summary of Configuring Serial Encapsulation
This topic summarizes the key points that were discussed in this lesson.
?– A point-to-point (or serial) line can connect two geographically distant sites. These
lines are usually leased from a carrier and are, therefore, often called leased lines.
?– Bandwidth refers to the rate at which data is transferred over the communication link.
In North America, point-to-point leased line bandwidth is typically speci?¬?ed as a
DS number (DS0, DS1, and so forth) that technically refers to the rate and format of
the signal.
?– The HDLC protocol is one of two major data link layer protocols commonly used with
point-to-point WAN connections. HDLC supports both point-to-point and multipoint
con?¬?gurations.
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