Specifications

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OC3 POS SMF OC3B PIC 643 1078 0.9999627 0.9999813
Chassis System 64 114 0.9996251 0.9998125
OC3 POS MMF OC3A PIC 597 985 0.9999598 0.9999799
OC3 POS MMF OC3B PIC 931 1555 0.9999742 0.9999871
OC3 ATM A 544 1058 0.9999559 0.9999779
OC12-1 SMF POS 707 1158 0.9999661 0.9999830
OC12-1 MMF POS 881 1434 0.9999728 0.9999864
ATM-A OC12 535 1029 0.9999551 0.9999776
OC12-1-B SMF ATM PIC 815 1331 0.9999706 0.9999853
OC12-1 MMF ATM PIC 1055 1709 0.9999773 0.9999886
OC12 Channelized SMF 527 890 0.9999545 0.9999772
LX Gigabit Ethernet Card 578 1099 0.9999585 0.9999792
SX Gigabit Ethernet Card 724 1264 0.9999669 0.9999834
OC48 SMF 577 1052 0.9999584 0.9999792
OC192 SMF 111 179 0.9997838 0.9998919
NOTES:
The following systems MTBFs were provided by the supplier: Power Supply,
Fan, and Routing Engine.
* Power supplies, Fan Trays, MCS, and REs are fully redundant: 1 to 1. One
SFM can support the system wit h reduced bandwidth; hence, 1:4 active
redundancy.
** Predicted measure of the degree to which a system is in an operable state
at any time (MTTR : Mean Time To Repair).
M160 CHASSIS AND CONTROLLERS SYSTEM RELIABILITY ANALYSIS
BackplaneBackplane
Power SupplyPower Supply
Fan Tray TopFan Tray Top
Fan Tray LowerFan Tray Lower
Power SupplyPower Supply
Rear Fan TrayRear Fan Tray
Rear Fan TrayRear Fan Tray
SFM 1SFM 1
SFM 2SFM 2
SFM 3SFM 3
SFM 4SFM 4
RE 1RE 1
RE 2RE 2
PCG 1PCG 1
PCG 2PCG 2
MCS 1MCS 1
MCS 2MCS 2
MTBF (khrs) ** Availability (At 40C)
40C 25C MTTR = 24hrs MTTR = 12hrs
* Power Supplies (1:1) 300 675 0.9999200 0.9999600
* Fan Trays Top & Lower (1:1) 1500 2625 0.9999840 0.9999920
* Fan Trays Rear (1:1) 3300 5775 0.9999927 0.9999964
Backplane 240 435 0.9999000 0.9999500
* SFM (1:4) 246 435 0.9999024 0.9999512
* MCS (1:1) 326 528 0.9999264 0.9999632
PCG 445 709 0.9999461 0.9999730
* Routing Engine (1:1) 450 750 0.9999467 0.9999733
SYSTEM RELIABILITY 64 114 0.9996257 0.9998128