Web Interface Settings Glossary 88
Protocol Menu (VHSI Tree) > Virtual Circuits Group (when protocol is set to X.25)
These parameters are only available when the protocol is set to X.25.
PVC - Permanent Virtual Circuits
Defines settings for PVCs (Permanent Virtual Circuits). A PVC is permanently established
between two destinations. No call setup is required.
IVC - Incoming Virtual Circuits
Defines settings for IVCs (Incoming Virtual Circuits). An IVC can only receive calls.
TVC - Two-way Virtual Circuits
Defines the settings for TVCs (Two-way Virtual Circuits). A TVC can both make and receive
calls.
OVC - Outgoing Virtual Circuits
Defines the settings for OVCs (Outgoing-only Virtual Circuits). An OVC can only issue calls
and not receive them.
Sequential Assignment of VCs
Enables/disables sequential assignment of virtual circuits. Most X.25 networks assign virtual
circuits sequentially. However, some networks, such as British Telecom's Packet Switch
Stream, assign virtual circuits non-sequentially using Logical Channel Group numbers. If this
is the case, you must define the starting LCN (Logical Channel Number) for each group of
virtual circuits (PVC, IVC, TVO, and OVC).
Default: Enabled.