User`s guide

R Series Data Center Products User’s Guide, Rev. B Chassis and Blade Installation • 47
Daisy Chain uses the same ClearCube proprietary data link that connects blades
to C/Ports.
Table 7 shows the distance and node limitations on the Admin and Spare Daisy
Chains for various C/Ports used with the R4300.
Spare Allocation Examples
When using the spare switching feature of the chassis, you must consider how to
arrange your spares and how many to use. The chassis can support a ratio of one
spare for one active PC blade. A more common ratio is one spare for every seven
active blades. The lowest ratio of sparing that ClearCube recommends is one spare
for 47 PC blades (configured by daisy-chaining the spare connections). Figure 22
shows these sparing scenarios as examples.
NOTE: Sparing is a switching function of the R4300 chassis. If no spare blade is
connected to the Spare Daisy Chain, or if the Spare blade is completely
powered down, the spare switch action will succeed but the user will not be
connected to a usable blade.
Table 7 R4300 Daisy-Chain Distance Limitations
C/Port Model
C7100 (p/n 091024) C7110 (p/n 091052 or 091055)
Distance from R4300
10M 100M 150M 200M 10M 100M 150M 200M
Admin Daisy Chain (# of chassis)
14 14 14 14 14 14 14 14
Spare Daisy Chain (# of chassis)
14 14 14 14 14 14 14 14
C/Port Model
C7120 (p/n 091056) C7100–C7120 + MVX
Distance from R4300
10M 100M 150M 200M 10M 100M 150M 200M
Admin Daisy Chain (# of chassis)
14 14 14 14 14 14 14 14
Spare Daisy Chain (# of chassis)
14 14 14 14 14 14 14 14
C/Port Model
C7120W (p/n 091169) C7120W + MVX
Distance from R4300
10M 100M 150M 200M 10M 100M 150M 200M
Admin Daisy Chain (# of chassis)
14 14 14 14 14 14 11 5
Spare Daisy Chain (# of chassis)
14 14 14 14 14 14 8 0
C/Port Model
C7130 (p/n 091154) rev C02 or lower C7130 (p/n 091154) rev D01 or higher
Distance from R4300
10M 100M 150M 200M 10M 100M 150M 200M
Admin Daisy Chain (# of chassis)
8 7 7 6 10 10 12 14
Spare Daisy Chain (# of chassis)
4 4 5 2 9 9 10 11