Appendix C Reference Information
Traffic Shaping, UPC, and Virtual Interface Configuration Compatibilities
C-38
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
ATM Traffic Shaping
Sample CPS
Calculation Table
Use the information in Table C-11 as a guide for calculations to determine
ATM traffic shaping for cps on the appropriate module.
Sample calculation: If the ATM traffic-shaped connection is configured with
the PCR (Minimum/Actual Target CPS column) value 906 and the maximum
target CPS (Maximum Target CPS column) value 909, the ATM Traffic Shap-
ing feature is actually shaping the traffic to the (Actual CPS column) value
906 cps. The divergence is smallest at low PCR.
Figure C-1. Combining the UPC Feature and Either the TS or VI Feature on a
Connection
Chassis Backplane
VI or TS
Rx
Tx
Ingress Path
Egress Path
UPC
I/O Module 1
VI or TS
Rx
Tx
Ingress Path
Egress Path
UPC
I/O Module 2
Table C-11. ATM Traffic Shaping CPS Calculation Table
Actual Rate (in
bps)
Minimum/Actual
Target CPS
Maximum Target
CPS
Actual CPS
64,000
151
152
151
128,000
302
303
302
192,000
453
454
453
256,000
604
606
604
320,000
755
757
755
383,999
906
909
906
448,383
1,058
1,062
1,058
512,876
1,210
1,215
1,210
575,999
1,358
1,365
1,358
639,999
1,509
1,517
1,509
713,142
1,682
1,691
1,682