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Q.6.4
Is it possible to control the band between VCs (for example, widen the cell transmission interval between VC1
and VC2)?
A.6.4
Yes. Forcibly narrow the band by using an unassigned cell generator. If the priority of the unassigned cell
generator is set to the highest level, all data cell intervals are extended by the band used for the unassigned cell
generator.
Example of cell transmission:
VC1, VC2, and VC3 use shaper 1
Setting of shaper 1: I/M = 1/9, P = 0, C = 2
Normal cell transmission
VC1
VC2
VC3
UN
Cell transmission when unassigned cell generator is used
Shaper 0 is set to unassigned cell generator
Setting of shaper 0: I/M = 2/3, P = 0, C = 2
VC1
UN
UN
UN
Reference: µ PD98409 User's Manual 5.4.4 (9) Unassigned cell generator function
Q.6.5
What is the time set for transmitting one cell in cell transmission scheduling?
A.6.5
The µ PD98409 performs cell transmission scheduling by using 24 BUSCLK input clocks as one unit. The cell to
be transmitted next is determined every 24 clocks.
Reference: µ PD98409 User's Manual 5.4.4 (7) Algorithm operation
CHAPTER 6 TRANSMISSION SCHEDULER
UN
UN
UN
UN
UN
VC2
UN
VC3
UN
UN
Unassigned cell transmitted by unassigned
cell generator
Information S14769EJ1V0IF00
VC1
VC2
VC3
UN
UN
VC1
UN
UN
UN
UN
VC1, 2, 3: Data cell
UN: Unassigned cell
UN
UN
UN
UN
VC2
UN
VC3
UN
21
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