Appendix A Reference Information
ATM TS, UPC, and VI Configuration Capabilities
A-12
255-700-585
PacketStar
®
PSAX 3-Port DS3/E3 ATM Protection Module User Guide
, Issue 1
Release 10.0.0
ATM Traffic Shaping Sample CPS Calculation Table
Use the information in Table A-8 as a guide for calculations to determine
ATM traffic shaping for cps on the
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.
2-Port OC-3c/STM-1
Enhanced ATM Single-Mode
x
x
32,000 24 cps
2
×
MBS
After
CBR
~1% of line
rate
4-Port OC-3c/STM-1
Multimode
x
x
x
32,000 24 cps
2
×
MBS
After
CBR
~1% of line
rate
4-Port OC-3c/STM-1
Single-Mode
x
x
x
32,000 24 cps
2
×
MBS
After
CBR
~1% of line
rate
Serial Interface Modules
Quadserial
x
‡
N/A
N/A
N/A
N/A
N/A
*
If you specify a rate below the minimum supported PCR, the module defaults to traffic shaping at the min-
imum supported PCR.
†
A connection configured for a PCR less than the specified rate has an output rate within 1% of the config-
ured PCR.
‡
UPC is available only when using channelization to DS0s.
Table A-7. ATM Traffic Management Capabilities by Module (Continued)
Modules
Feature Support
ATM Traffic Shaping (TS)
EPD GFR UPC VI
TS
Max.
No. of
VCs
Min.
PCR
*
Queue
Size
Priority
Precision for
One
Connection
†
Table A-8. 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
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