Cisco ASR 5000 Series, Обзор продукта

Страница: 75 / 992

ASR 5000 Hardware Platform Overview
ASR 5000 Chassis Descriptions ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Rear Slot Numbering with Full-height Line Cards
ASR 5000 systems may be configured with 10 Gigabit Ethernet Line Cards (XGLCs). These are full-height line cards
for which the half-height card guide is removed in order to accommodate the cards. In this case, only the upper slot
number is used to refer to the XGLC. For half-height cards installed with the XGLCs, the half-height slot numbering
scheme is maintained.
For example, XGLCs installed in slots 17 and 32 also take up slots 33 and 48, but are referred to as cards in slots 17 and
32 only. The slots in which the SPIOs and RCCs are installed in the same configuration, are slots 24 and 25, and 40 and
41, respectively.
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).
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.
To ensure all Central Office (CO) requirements and regulations are met, Nortel Networks currently mounts two PDSN
16000 shelves in a PTE 2000 frame measuring 600 mm (23.6-inch) wide by 900 mm (35.4-inch) deep by 2125 mm
(6.97-feet) high.
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.
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.
The midplane also contains two separate -48 VDC busses (not shown) that distribute redundant power to each card
within the chassis.