Contents

Introduction

Problem: ASR5500 capacity upgrade card slot selection.

Solution

Table of Contents

Introduction

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.

Problem: ASR5500 capacity upgrade card slot selection.

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.

Solution

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)

Slot

Card Sequence

Requirement

Rear of Chassis

1

DPC-5 or UDPC-5

Available

2

DPC-3 or UDPC-3

Required for all systems

3

DPC-1 or UDPC-1

Required for all systems

4

DPC-7 or UDPC-7

Available

5

MIO-1 or UMIO-1

Required for all systems

6

MIO-2 or UMIO-2

Required for all systems

7

DPC-8 or UDPC-8

Available

8

DPC-2 or UDPC-2

Required for all systems

9

DPC-4 or UDPC-4

Required for all systems

10

DPC-6 or UDPC-6

Available

Front of Chassis

11

SSC-2

Required for all systems

12

SSC-1

Required for all systems

13

FSC-6

Available

14

FSC-4

Required for all systems

15

FSC-2

Required for all systems

16

FSC-3

Required for all systems

17

FSC-1

Required for all systems

18

FSC-5

Available

19

Reserved

20

Reserved

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.

Card Type

Slot

Plane 1

Plane 2

Plane 3

Plane 4

Rear Cards

DPC or UDPC, DPC2

1

—

—

—

Yes

DPC or UDPC, DPC2 or UDPC2

2

—

—

—

Yes

DPC or UDPC, DPC2 or UDPC2

3

—

—

—

Yes

DPC or UDPC, DPC2 or UDPC2

4

—

Yes

—

—

MIO or UMIO

5

—

Yes

—

—

MIO or UMIO

6

—

—

Yes

—

DPC or UDPC, DPC2 or UDPC2

7

—

—

Yes

—

DPC or UDPC, DPC2 or UDPC2

8

Yes

—

—

—

DPC or UDPC, DPC2 or UDPC2

9

Yes

—

—

—

DPC or UDPC, DPC2 or UDPC2

10

Yes

—

—

—

Front Cards

SSC

11

—

Yes

—

—

SSC

12

—

Yes

—

—

FSC

13

Yes

—

—

—

FSC

14

—

—

Yes

—

FSC

15

—

—

Yes

—

FSC

16

—

Yes

—

—

FSC

17

—

Yes

—

—

FSC

18

—

—

—

Yes

Reserved

19

—

—

Yes

—

Reserved

20

—

—

Yes

—

Fan Trays

Upper

Top

—

—

Yes

—

Lower

Bottom

—

Yes

—

—

This table summarizes the maximum power requirements for various chassis components

Cards

Maximum power

FSC

150 watts

SSC

10 watts

MIO or UMIO

650 watts

DPC or UDPC

630 watts

DPC2 or UDPC2

760 watts

Fan Tray Unit

Front

60 watts each (2 per chassis)

Rear

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 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:UDPC2 + UDPC3 + UDPC 1 = 1890 W

Same calculations applies for other cards (FSC)