Specifications
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Interface Tested:
OC12 ATM
Test Date: 5/26/99
router router router router input output input bps output bps
input bps output bps input pps output pps # of cells # of cells without without
Packet Size
per packet per packet sonet ohead
sonet ohead
48 213200320 213190400 666251 666220 2 2 564980848 564954560
64 245178528 245161232 666246 666199 2 2 564976608 564936752
120 379648896 379652160 465256 465260 3 3 591805632 591810720
128 408734480 408760000 464471 464500 3 3 590807112 590844000
256 448306320 448304416 235455 235454 6 6 598997520 598994976
300 455303664 455301408 201819 201818 7 7 598998792 598995824
512 507551408 507555360 128429 128430 11 11 598992856 598997520
1024 516802320 516802320 64215 64215 22 22 598997520 598997520
1500 523418688 523418688 44148 44148 32 32 599000064 599000064
mix 245177872 245166016 666244 666212 2 2 564974912 564947776
input output input output
sonet sonet input bps output bps percent percent
Packet Size
overhead overhead total total line rate line rate
48 23040000 23040000 588020848 587994560 0.945250 0.945207
64 23040000 23040000 588016608 587976752 0.945243 0.945179
120 23040000 23040000 614845632 614850720 0.988371 0.988379
128 23040000 23040000 613847112 613884000 0.986766 0.986825
256 23040000 23040000 622037520 622034976 0.999932 0.999928
300 23040000 23040000 622038792 622035824 0.999934 0.999929
512 23040000 23040000 622032856 622037520 0.999924 0.999932
1024 23040000 23040000 622037520 622037520 0.999932 0.999932
1500 23040000 23040000 622040064 622040064 0.999936 0.999936
mix 23040000 23040000 588014912 587987776 0.945240 0.945196
Field Descriptions
Packet Size Size of packet generated by Smartbits traffic simulator.
Router Input BPS Bits per second received by test interface (excludes layer 1/2 overhead)
Router Output BPS Bits per second transmitted by test interface (excludes layer 1/2 overhead)
Router Input PPS IP Packets per second received by test interface
Router Input PPS IP Packets per second transmitted by test interface
Input Cells per Packet Number of ATM cells required to carry IP Packet
Output Cells per Packet Number of ATM cells required to carry IP Packet
Input BPS without SONET Bits per Second Input based on AAL5 (IP packet, cell filler and cell tax)
Output BPS without SONET Bits per Second Output based on AAL5 (IP packet, cell filler and cell tax)
Input SONET Ohead Input overhead for SONET line framing
Output SONET Ohead Output overhead for SONET line framing
Input BPS Total Aggregate BPS of IP packet + ATM overhead + SONET overhead
Output BPS Total Aggregate BPS of IP packet + ATM overhead + SONET overhead
Input percent Line Rate "Input BPS Total" / clock rate of wire (622080000) = Input percent Line Rate
Output percent Line Rate "Output BPS Total" / clock rate of wire (622080000) = Output percent Line Rate
Note: Performance roll off on OC12ATM PIC is due to SAR "Maker Chip" limitation and not due to system architecture. Other
vendors realize similar performance characteristics.