Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
ST16 Hardware Platform Overview
ST16 Chassis Descriptions ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22937-01
Mounting Options
The chassis is designed for installation in a standard 19-inch wide (48.26 cm) equipment rack. Additional rack hardware
(such as extension brackets) may be used to install the chassis in a standard 23-inch (58.42 cm) rack. Each chassis is
24.50 inches (62.23 cm) high. This equates to roughly 14 Rack Mount Units (RMUs: 1 RMU = 1.75 in (4.45 cm).
(such as extension brackets) may be used to install the chassis in a standard 23-inch (58.42 cm) rack. Each chassis is
24.50 inches (62.23 cm) high. This equates to roughly 14 Rack Mount Units (RMUs: 1 RMU = 1.75 in (4.45 cm).
You can mount a maximum of three chassis in a standard 48 RMU (7 feet) equipment rack or telco cabinet provided that
all system cooling and ventilation requirements are met. A fully-loaded rack with three chassis installed has
approximately 5.5 inches (13.97 cm, 3.14 RMUs) of vertical space remaining.
all system cooling and ventilation requirements are met. A fully-loaded rack with three chassis installed has
approximately 5.5 inches (13.97 cm, 3.14 RMUs) of vertical space remaining.
There are two options for mounting the chassis in a standard equipment rack or telecommunications cabinet:
Standard: In this configuration, the flanges of the mounting brackets are flush with the front of the chassis. This
is the default configuration as shipped.
Mid-mount: In this configuration, the flanges of the mounting brackets are recessed from the front of the
chassis. To do this, install the mounting brackets toward the middle of the chassis on either side.
Caution:
When planning chassis installation, take care to ensure that equipment rack or
cabinet hardware does not hinder air flow at any of the intake or exhaust vents. Additionally, ensure
that the rack/cabinet hardware, as well as the ambient environment, allow the system to function
within the required limits. For more information, refer to the Environmental Specifications chapter
of this guide.
that the rack/cabinet hardware, as well as the ambient environment, allow the system to function
within the required limits. For more information, refer to the Environmental Specifications chapter
of this guide.
Midplane Architecture
Separating the front and rear chassis slots is the midplane. The connectors on the midplane provide intra-chassis
communications, power connections, and data transport paths between the various installed cards.
communications, power connections, and data transport paths between the various installed cards.
The midplane also contains two separate -48 VDC busses (not shown) that distribute redundant power to each card
within the chassis.
within the chassis.
Figure 14. Midplane/Switch Fabric Architecture
../../../GRAPHICS/Production/ST-series_Hardware/chassis_busses_v4.wmf
Table 6. Midplane and Bus Descriptions
Item
Description
1
Slot number 1 (left-most application card slot)
2
Chassis midplane: provides intra-chassis communications and data transport paths between the various installed cards
3
SPIO cross-connect bus
4
Chassis slot number 16: right-most application card slot