/td> Yahoo! is not affiliated with the authors of this page or responsible for its content.
Fabric Card Chassis Power System
C H A P T E R
2-1
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
2
Fabric Card Chassis Power System
This chapter describes the power system used in the fabric card chassis (FCC). It includes the following
sections: Power System Overview DC Power Systems AC Power Systems Alarm Module
Power specifications are provided in
Appendix A, Specifications.
Power System Overview
The FCC can be powered by either AC (Wye or Delta) or DC power. The chassis power system takes the
facility power and converts it to the DC voltage necessary to power system components. Both AC and
DC power systems are fully redundant and contain the following components: Two (redundant) AC or DC power shelves Three AC rectifiers or two DC power entry modules (PEMs) for each power shelf Alarm modules, one for each power shelf Dual bus bars, which provide redundant power inputs to chassis components Special components, such as DC-to-DC converters, online insertion and removal (OIR) diodes, and
EMI filters
Different power shelves are used for AC Wye, AC Delta, and DC input power. Each AC power shelf
contains three AC rectifiers, and each DC power shelf contains two DC PEMs. An alarm module is
included with all power shelves.
Figure 2-1
shows an AC power shelf. 2-2
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
Chapter 2 Fabric Card Chassis Power System
Power System Overview
Figure 2-1
AC Power Shelf
Power Architecture
AC and DC power systems use A and B power shelves to provide reliable, 2N redundant power to all
chassis components.
Figure 2-2
shows the power architecture and power distribution of an FCC.
Figure 2-2
Fabric Card Chassis Power Distribution
As shown in
Figure 2-2
, AC or DC input power enters the chassis through the two power shelves and is
distributed to the A or B power bus. Both bus bars distribute power through the backplane to the SCGE
cards (2-port or 22-port), fan trays, and SFCs. The A power shelf supplies 48 VDC to the A bus bar. The B power shelf supplies 48 VDC to the B bus bar.
101801
PWR
OK
FLT
AC
FAIL
CB
TRIP
I
LIM
OT
PWR
OK
FLT
AC
FAIL
CB
TRIP
I
LIM
OT
PWR
OK
FLT
AC
FAIL
CB
TRIP
I
LIM
OT
AC-to-DC rectifiers
or
DC PEMs
OR-ing diodes,
inrush control,
& controller
Fans (9)
SCGEs (2)
"B" -48 VDC
OR-ing diodes,
inrush control
& EMI filter
Digital circuits
Digital circuits
SFCs (24)
138061
"A"
powershelf
AC or DC
"A"
power input
AC or DC
"A" -48 VDC
"B" -48 VDC
"A" -48 VDC
AC-to-DC rectifiers
or
DC PEMs
"B"
powershelf
AC or DC
"B"
power input
AC or DC
A1A4
load
zones
"A"
bus bar
B1B4
load
zones
Backplane
"B"
bus bar
Fan trays (2) 2-3
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
Chapter 2 Fabric Card Chassis Power System
Power System Overview
Because chassis components are powered by both A and B power inputs, the FCC can continue to operate
normally if: One AC rectifier or DC PEM fails One entire power shelf fails One bus bar fails
Two failures have to occur for the system to be degraded. In addition, the failures must occur in both the A
and B sides of the power architecture and affect the same load zone for the degradation to occur.
Individual chassis components have power-related devices (online insertion and removal [OIR] diodes,
inrush control circuits, and EMI filters) that are part of the chassis power architecture. These
power-related devices form part of the dual power source (A and B buses) architecture and enable OIR
of the component, also called hot-swapping.
AC Power System Fabric Card Chassis Load Zones
The AC power system distributes power in the chassis through four load zones, which provide power
redundancy and reliability. Each load zone receives power from both bus bars (A and B), which ensures
that each card and module in the chassis is powered by both power shelves.
An FCC can lose a single power module or an entire power shelf and still have the power to operate. For
a load zone to lose complete power, a power module in each power shelf would have to fail.
Figure 2-3
shows the four load zones on the SFC side of the FCC. 2-4
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
Chapter 2 Fabric Card Chassis Power System
Power System Overview
Figure 2-3
AC Power System Fabric Card Chassis Load Zones (SFC Side)
As shown in
Figure 2-3
, each power module (AC rectifier) powers two load zones: Power module A0 powers load zones 1 and 3 (Z1 and Z3). Power module A1 powers load zone 2 (Z2). Power module A2 powers load zone 4 (Z4). Power module B0 powers load zones 1 and 3 (Z1 and Z3). Power module B1 powers load zone 2 (Z2). Power module B2 powers load zone 4 (Z4).
138055
A0
B0
A1
Power Shelf (PS0)
Power Shelf (PS1)
Fan Tray (FT0)
S
F
C
0
S
F
C
1
S
F
C
2
S
F
C
3
S
F
C
4
S
F
C
5
S
F
C
6
S
F
C
7
S
F
C
8
S
F
C
9
S
F
C
10
S
F
C
11
S
C
G
E
0
S
F
C
12
S
F
C
13
S
F
C
14
S
F
C
15
S
F
C
16
S
F
C
17
S
F
C
18
S
F
C
19
S
F
C
20
S
F
C
21
S
F
C
22
S
F
C
23
S
C
G
E
1
Upper SFC Card Cage
Lower SFC Card Cage
Fan Tray (FT1)
B1
A2
B2
AM0
AM1
Zone 3
Zone 4
Zone 1
Zone 2
Z1
Z3
Z2
Z2
Z1
Z3
Z2
Z2
Z4
Z4
Z4
Z4 2-5
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
Chapter 2 Fabric Card Chassis Power System
Power System Overview
Figure 2-3
also shows which load zones power which chassis slots: Load zone 1 (Z1) powers chassis slots 0 through 8. Load zone 2 (Z2) powers chassis slots 9 through 11 and the SCGE0 (2-port or 22-port) card. Load zone 3 (Z3) powers chassis slots 12 through 20. Load zone 4 (Z4) powers chassis slots 21 through 23 and the SCGE1 (2-port or 22-port) card.
Figure 2-4
shows the four load zones on the OIM side of the FCC.
Figure 2-4
AC Power System Fabric Card Chassis Load Zones (OIM Side)
Figure 2-4
also shows which load zones power which chassis slots on the OIM side of the chassis: Load zone 2 (Z2) powers the OIM-LED0 card and chassis slots 11 through 9 Load zone 1 (Z1) powers chassis slots 8 through 0 Load zone 4 (Z4) powers the OIM-LED1 card and chassis slots 23 through 21 Load zone 3 (Z3) powers chassis slots 20 through 12 The fan trays (FT0 and FT1) receive their operating power from the SCGE (2-port or 22-port) cards
(SCGE0 and SCGE1).
DC Power System Fabric Card Chassis Load Zones
The DC power system distributes power in the chassis through four load zones, which provide power
redundancy and reliability. Each load zone receives power from both bus bars (A and B), which ensures
that each card and module in the chassis is powered by both power shelves.
138056
Upper OIM Array
Lower OIM Array
OIM
LED
0
OIM
LED
1
O
I
M
11
O
I
M
10
O
I
M
9
O
I
M
8
O
I
M
7
O
I
M
6
O
I
M
5
O
I
M
4
O
I
M
3
O
I
M
2
O
I
M
1
O
I
M
0
O
I
M
23
O
I
M
22
O
I
M
21
O
I
M
20
O
I
M
19
O
I
M
18
O
I
M
17
O
I
M
16
O
I
M
15
O
I
M
14
O
I
M
13
O
I
M
12
Zone 2
Zone 1
Zone 4
Zone 3 2-6
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
Chapter 2 Fabric Card Chassis Power System
Power System Overview
An FCC can lose a single power module or an entire power shelf and still have the power to operate. For
a load zone to lose complete power, a power module in each power shelf would have to fail.
Figure 2-5
shows the four load zones on the SFC side of the FCC.
Figure 2-5
DC Power System Fabric Card Chassis Load Zones (SFC Side)
As shown in
Figure 2-5
, each power module (DC PEM) powers two load zones: Power module A0 powers load zones 1 and 2 (Z1 and Z2) Power module A1 powers load zones 3 and 4 (Z3 and Z4) Power module B0 powers load zones 1 and 2 (Z1 and Z2) Power module B1 powers load zones 3 and 4 (Z3 and Z4)
138057
A0
B0
A1
Power Shelf (PS0)
Power Shelf (PS1)
Fan Tray (FT0)
S
F
C
0
S
F
C
1
S
F
C
2
S
F
C
3
S
F
C
4
S
F
C
5
S
F
C
6
S
F
C
7
S
F
C
8
S
F
C
9
S
F
C
10
S
F
C
11
S
C
G
E
0
S
F
C
12
S
F
C
13
S
F
C
14
S
F
C
15
S
F
C
16
S
F
C
17
S
F
C
18
S
F
C
19
S
F
C
20
S
F
C
21
S
F
C
22
S
F
C
23
S
C
G
E
1
Upper SFC Card Cage
Lower SFC Card Cage
Fan Tray (FT1)
B1
AM0
AM1
Zone 3
Zone 4
Zone 1
Zone 2
Z1
Z2
Z3
Z4
Z1
Z2
Z3
Z4 2-7
Cisco CRS-1 Carrier Routing System Multishelf System Description
OL-7071-04
Chapter 2 Fabric Card Chassis Power System
Power System Overview
Figure 2-5
also shows which load zones power which chassis slots: Load zone 1 (Z1) powers chassis slots 0 through 8 Load zone 2 (Z2) powers chassis slots 9 through 11 and the SCGE0 (2-port or 22-port) card Load zone 3 (Z3) powers chassis slots 12 through 20 Load zone 4 (Z4) powers chassis slots 21 through 23 and the SCGE1 (2-port or 22-port) card
Figure 2-6
shows the four load zones on the OIM side of the FCC.
Figure 2-6
DC Power System Fabric Card Chassis Load Zones (OIM Side)
Figure 2-6
also shows which load zones power which chassis slots on the OIM side of the chassis: Load zone 2 (Z2) powers the OIM-LED0 card and chassis slots 11 through 9 Load zone 1 (Z1) powers chassis slots 8 through 0 Load zone 4 (Z4) powers the OIM-LED1 card and chassis slots 23 through 21 Load zone 3 (Z3) po