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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
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Cisco uBR7200-NPE-G2 with a 1.67 GHz Motorola Freescale MPC7448 processor
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System controller:
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NPE-150, NPE-200, and NPE-225 have a system controller that uses direct memory access
(DMA) to transfer data between DRAM and packet static random access memory (SRAM) on
the network processing engine.
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NPE-300 has two system controllers that provide processor access to the two midplane and
single I/O controller PCI buses. The system controllers also allow port adapters on either of the
two midplane PCI buses access to SDRAM.
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NPE-400 has a single system controller.
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Cisco uBR7200-NPE-G1 and Cisco uBR7200-NPE-G2 does not require an I/O controller.
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Upgradable memory modules:
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NPE-150 and NPE-200 use DRAM for storing routing tables, network accounting applications,
packets of information in preparation for process switching, and packet buffering for SRAM
overflow. The standard configuration is 32 MB, with up to 128 MB available through single
in-line memory module (SIMM) upgrades.
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NPE-225 uses SDRAM for providing code, data, and packet storage.
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NPE-300 and NPE-400 use SDRAM for storing all packets received or sent from network
interfaces. The SDRAM also stores routing tables and network accounting applications. Two
independent SDRAM memory arrays in the system allow concurrent access by port adapters
and the processor.
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Cisco uBR7200-NPE-G1—SDRAM: 256 MB (default), 512 MB, and 1 GB. There are two
DRAM memory slots, so 256-MB of memory consists of two 128 MB memory SODIMMs, 512
MB consists of two 256-MB memory SODIMMs, and 1 GB consists of two 512 MB memory
SODIMMs. It is necessary to have the same size SODIMM in each memory bank on an
NPE-G1. The type of DRAM memory being used on the NPE-G1 is double data-rate (DDR)
memory. DDR memory provides high-performance memory access rates.
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Cisco uBR7200-NPE-G2—SDRAM: 1 GB (default) and 2 GB. There are two DRAM memory
slots, so 1 GB of memory consists of two 512-MB memory SODIMMs, 2 GB consists of two 1
GB memory SODIMMs. It is necessary to have the same size SODIMM in each memory bank
on an NPE-G2. The type of DRAM memory being used on the NPE-G2 is double data-rate
(DDR) memory. DDR memory provides high-performance memory access rates.
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Packet SRAM for storing packets of information in preparation for fast switching:
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NPE-150 has 1 MB of SRAM.
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NPE-200 has 4 MB of SRAM.
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NPE-225, NPE-300, and NPE-400 do not have packet SRAM.
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Cisco uBR7200-NPE-G1—SDRAM: 256 MB (default), 512 MB, and 1 GB. There are two
DRAM memory slots, so 256 MB of memory consists of two 128 MB memory SODIMMs, 512
MB consists of two 256-MB memory SODIMMs, and 1 GB consists of two 512 MB memory
SODIMMs. It is necessary to have the same size SODIMM in each memory bank on an
NPE-G1. The type of DRAM memory being used on the NPE-G1 is double data-rate (DDR)
memory. DDR memory provides high-performance memory access rates.
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Cache memory:
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NPE-150 and NPE-200 have unified cache SRAM that functions as the secondary cache for the
microprocessor. (The primary cache is within the microprocessor.)
