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(Where lic is a low incoming circuit number,
hic is a high incoming circuit number, ltc is a low two-way circuit
number, htc is a high two-way circuit number, loc is a low outgoing
circuit number, and hoc is a high outgoing circuit number.)
If both limits of a range are zero, the range
is unused.
X.25 ignores any events on a VC number that
are not in an assigned VC range; it considers the out-of-range VC as
a protocol error. The network administrator specifies the VC ranges
for an X.25 attachment. For correct operation, the X.25 DTE and DCE
devices must have identically configured ranges. Numbers configured
for any PVCs must also agree on both sides of an attachment (not
necessarily end to end).
The following example may help you understand
why you would configure VC ranges. If you acquire ten circuits from
your SVC provider and use all ten on a given situation, incoming
calls cannot get through. You can partition the ten circuits to be
dedicated to different calling situations-incoming, outgoing, or
either:
- Incoming
- Incoming
- Incoming
- Either
- Either
- Either
- Either
- Outgoing
- Outgoing
- Outgoing
If many incoming calls are coming in, some
circuits are still available for outgoing calls.