Chapter 1 Product Overview - Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual

C H A P T E R 1
Product Overview
This chapter provides physical and functional overviews of the Cisco 12012 Gigabit Switch
Router (GSR). It contains physical descriptions of the router hardware and major
components, and functional descriptions of the hardware-related features.
The Cisco 12012 is a member of the Cisco 12000 series of gigabit switch routers. The
Cisco 12012 is aimed at scaling the Internet and enterprise backbones to speeds of
OC-3/STM-1 (155 Mbps), OC-12/STM-4 (622 Mbps), and OC-48/STM-16 (2.4 Gbps).
The Cisco 12012 is built around a high-speed switching fabric that is scalable from 5 to 60
Gbps, providing high-performance to support IP-based local and wide-area networks
(WANs).
The Cisco 12012 has two separate card cages; the upper card cage and the lower card cage.
The upper card cage has 12 user-configurable slots that support a combination of line cards
and a Route Processor (RP). The rightmost slot in the upper card cage supports a
non-configurable alarm card. Network interfaces reside on line cards that provide
connection between the router's switch fabric and the external networks.
The lower card cage has five slots for the cards containing the switch fabric: clock and
scheduler cards (CSCs) and switch fabric cards (SFCs). The lower card cage is keyed; the
top two slots accept clock and scheduler cards, and the lower three slots accept switch fabric
cards.
You can configure the Cisco 12012 for either source AC operation or source DC operation.
AC-input or DC-input power supplies reside in a power supply bay located near the bottom
of the frame.
The Cisco 12012 does not support a mixture of AC- and DC-input power supplies.
Note
Product Overview 1-1