Cisco 7246 - uBR Router, Руководство по установке оборудования

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Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
OL-5421-03
Chapter 1 Cisco uBR7200 Series Overview
Hardware Component Descriptions
–
NPE-225, NPE-300, and NPE-400 have three levels of cache: a primary and a secondary cache
that are internal to the microprocessor, and a tertiary, 2-MB external cache that provides
additional high-speed storage for data and instructions.
– Cisco uBR7200-NPE-G1—16-MB packet memory on 256-MB SDRAM and 32-MB packet
memory on 512-MB and 1-GB SDRAM.
–
Cisco uBR7200-NPE-G2—32-MB packet memory on 512-MB and 1-GB SDRAM.
• Two environmental sensors for monitoring the cooling air as it leaves the chassis.
•
Boot ROM for storing sufficient code for booting the Cisco IOS software.
Note
To prevent DRAM errors in the NPE-150 or NPE-200, and to ensure that your system initializes correctly
at startup, DRAM bank 0 (socket U18 and U25, or U11 and U25)
must contain no fewer than two SIMMs
of the same type. You may also install two SIMMs of the same type in bank 1 (socket U4 and U12, or
U42 and U52); however, bank 0 must always contain the two largest SIMMs.
Note
The NPE-225 does not have packet SRAM.
Note
Both the NPE-300 and the NPE-400 are keyed to prevent insertion into the Cisco uBR7246 router.
Input/Output Controller
Note
Cisco uBR7200-NPE-G1 and Cisco uBR7200-NPE-G2 does not require the use of an I/O controller.
The I/O controller shares the memory functions and the environmental monitoring functions with the
NPE or the network services engine (NSE). The I/O controller contains the following components:
•
Dual EIA/TIA-232 channels for local and auxiliary console ports. The console port has full data
communications equipment (DCE) functionality and a DB-25 receptacle. The auxiliary port has full
data terminal equipment (DTE) functionality and a DB-25 plug.
•
Optional Fast Ethernet port that is configurable for use at 100-Mbps full-duplex or half-duplex
(half-duplex is the default). The Fast Ethernet port is equipped with an MII receptacle and an RJ-45
receptacle. There is no functional difference between the I/O controllers with the Fast Ethernet port
and the I/O controllers without the Fast Ethernet port.
Note
When using the I/O controller that is equipped with an MII receptacle and an RJ-45 receptacle, only one
receptacle can be configured for use at a time.
Note
Many of the initial shipments of the Cisco uBR7246 chassis that were equipped with a Fast Ethernet I/O
controller have an I/O controller with a single MII receptacle installed. These I/O controllers are fully
compatible with the router, and they are still supported; however, they are no longer available as spares.