Configuring X.25 8-33
X.25 PVC Pa rameters
1Logical channels must be lower than the l owest LCNs assigned to any subscribers on the
ports in the PVC configuration.
2Valid po rt nu mbers depe nd on t he m odel of SmartS witc h 1800 —see p ort l ocatio ns on
page 6- 1.
316, 32, 64 ,128, 256, 512, 10 24, 2048, or 4096
. Cannot be greater than the smaller
Maximum Packe t Size specified on the ports for both ends of the co nnection.
4Cannot be greater than the smaller Maximum Window Size specified on the ports for
both ends of the connection.
Connecti on Priori ty
prioritizes this connection for intr a-n odal traff ic; the higher the n umber, t he higher the
priority. (This priority has no effect on tr affic exiting a node.) Priorities are conf igured
on all logical interfaces that use a physical frame relay port. The device processor in
the node uses these priorities to help determine the order in which it will process pro-
tocols.

When configuring priorities, be careful to consider the types of

traffic being routed on other connections in the SmartSwitch.

Subs criber Name
identifies the subscriber to the console operator. The software does not use this infor-
mation.
Logical Channel
is a logical link between the node and the subscriber. The physical line may have a
number of logical channels. An LCN assigned to a port in a PVC must be lower than
the lowest LCN specified for any SVC subscriber on the same port.
Port
specifies the port at each end of the PVC.
Packet Size
allows setting a packet size for each end of the PVC. Generally the same packet size
will be configured on the port at each end, as well as in the PVC.
Window Size
allows setting a window size for each end of the PVC . Generally the same window size
will be configured on the port at each end, as well as in the PVC.
Table 8-5 X.25 PVC Parameters
Parameter Valid Values Default Value
Connection Priority 0–9 0
Subscriber Name 0–31 characters non e
Logical Ch annel 1–255 11
Port 0–7 20
Packet Si ze 128–40 96 3128
Window Size 1–7 42