Switched Virtual Channels; Permanent Virtual Channels - 3Com CoreBuilder 7000 Operation Manual

100 C 5: E
HAPTER STABLISHING
Switched Virtual
Channels
Permanent Virtual
Channels
ATM C
HANNELS
A virtual channel can be set up either automatically by signalling, in
which case it is called a switched virtual channel (SVC), or, you can set it
up manually through LMA in which case it is called a permanent virtual
channel (PVC).
Switched Virtual Channel (SVC) connections are defined dynamically
when they are needed and released when not needed, using signalling
according to ATM Forum UNI standards. By using SVC, ATM devices can
exchange connection characteristics when establishing connections.
These connections remain active for as long as the application demands.
Both point-to-point and point-to-multipoint connections can be
established. SVC eliminates the need for the external management
station to set up virtual channels.
The characteristics of the SVC connection include:


Connections initiated by the user/application


Connections established and released dynamically


Connections established via the signalling protocol


Varied connection duration
Table 24 presents a comparison between the two types of virtual
channels.
You establish a permanent virtual channel (PVC) manually by
management.
An established PVC connection is not automatically released and is not
dynamically checked and reinitiated.
The characteristics of the PVC connection include:


Connections initiated by network administrator


Connections established and released manually


Long-term duration connections in a LANE environment


Point-to-point and point-to-multipoint connections
Setting up PVCs
For information about how to set up a PVC, see "Create UBR PVC — Full
Setup" on page 180 in the Management Guide.