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This document describes how to select the slot into which the new card on ASR5500 is to be inserted.
Note: These are best practices only and the device will work, even if they aren't followed.
In the event of capacity upgrade of ASR5500 by new card addition, the selection of the exact slot into which the card should be inserted isn't as trivial as it looks like.
In the official documentation, in the ASR5500 installation guide, it is given a list with recommended card slot assignments (check the official documentation for an up to date table)
Rear of Chassis
DPC-5 or UDPC-5
DPC-3 or UDPC-3
Required for all systems
DPC-1 or UDPC-1
DPC-7 or UDPC-7
MIO-1 or UMIO-1
MIO-2 or UMIO-2
DPC-8 or UDPC-8
DPC-2 or UDPC-2
DPC-4 or UDPC-4
DPC-6 or UDPC-6
Front of Chassis
Those assignments are based on the multiple power planes sourcing power to the card slots.
When you choose a slot to insert a new card, it is recommended to follow the same principle, to ensure equal power load among all power planes.
There are 4 power planes that supply power to various ASR5500 chassis components. The table below summarizes the connections between the power planes and card slots.
DPC or UDPC, DPC2
DPC or UDPC, DPC2 or UDPC2
MIO or UMIO
This table summarizes the maximum power requirements for various chassis components
DPC or UDPC
DPC2 or UDPC2
Fan Tray Unit
60 watts each (2 per chassis)
940 watts each (2 per chassis)
Note: There are 4 fan tray units: Lower Rear Fan Tray, Upper Rear Fan Tray, Lower Front Fan Tray, Upper Front Fan Tray.
Based on the above list of tables we can make the calculations to determine into which slot to insert the next card.
In a ASR5500 deployment where the cards are arranged as per official recommendations, the power load on each power plane is as follows (assuming UDPC cards are used):
Plane 1: UDPC8+ UDPC9 = 1260W
Plane 2: MIO5+ SSC11+ SSC12+ FSC16+ FSC17+ Lower Fan Tray Rear+ Lower Fan Tray Front =1970 W
Plane 3: MIO6+FSC14+FSC15+Upper Fan Tray Rear + Upper Fan Tray Front = 1950 W
Plane 4:UDPC12+ UDPC3 = 1260 W
It is clearly visible that the power load on the planes 1 and 4 is lower, so it makes sense to insert new UDPC cards in one of free slots connected to Plane 1 or Plane 2, i.e. slot 10 or 1.
In this case, the power distribution will be almost equal over all planes
Plane 1: UDPC8+ UDPC9 + UDPC 10= 1890W
Plane 4:UDPC2 + UDPC3 + UDPC 1 = 1890 W
Same calculations applies for other cards (FSC)