Cisco 7246 - uBR Router Podręcznik użytkownika - Strona 6
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Q. What are the advantages of the built-in 10/100/1000Mb Ethernet interfaces?
A. The Cisco uBR7200-NPE-G1 incorporates three 10/100/1000 Mbps (either copper or fiber) ports as part of the integrated system
processor. That means that the Media Access Controllers (MACs) for those interfaces are able to directly connect to the system CPU at high
speeds due to the fact that they all exist on the same integrated circuit chip. Therefore, these ports do not take up any backplane bandwidth
on the Cisco uBR7246VXR. With the large LAN bandwidth available into the system from the 10/100/1000 Mbps interfaces, there is less
need for LAN interfaces in the port adapter slots. That means that all port adapter slots can be primarily used for WAN connectivity without
losing any bandwidth to LAN port adapters.
Q. What are the physical connectivity options for the built-in Cisco uBR7200-NPE-G1 interfaces?
A. In addition to having three 10/100/1000 Mbps Ethernet interfaces, the Cisco uBR7200-NPE-G1 also incorporates enormous flexibility
in the physical connections to those interfaces. Each of the three interfaces can independently operate at either 10 Mb/s Ethernet, 100 Mb/s
Fast Ethernet or 1000 Mb/s Gigabit Ethernet speeds. In addition to speed flexibility, each interface can also operate with either copper RJ-45
or GBIC connections. That means that the Cisco uBR7200-NPE-G1 supports 10 Mb, 100 Mb or 1000 Mb full/half duplex speeds over
copper RJ-45, as well as 1000 Mb full/half duplex Gigabit Ethernet with standard GBICs.
The Cisco NPE-G1 supports SX, LX/LH and ZX GBICs. No copper GBICs are supported since the Cisco uBR7200-NPE-G1 supports copper
Gigabit Ethernet with the fixed RJ-45 connector for each interface.
Q. How is the functional structure of the Cisco uBR7246VXR different with a Cisco uBR7200-NPE-G1 than previous NPEs?
A. The Cisco uBR7200-NPE-G1 takes advantage of the latest industry development in integrated system processors that integrate a general
purpose CPU core with most of the system components on a single chip. Components that would take up an entire NPE can now be integrated
into a single chip, which greatly reduces system cost, while significantly increasing system speed and reliability.
Figure 3
NVRAM
BootROM
BootFlash
PA Logic
DDR
Memory
DDR
Memory
Internal
LDT2PCI
Expansion
Bridge
Connector
Slots 1, 3, 5
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GBIC
RJ45
GBIC
RJ45
10/100/1000
10/100/1000
MAC
MAC
CPU
CPU
(unused today)
LDT Bus
PCI Bus
LDT2PCI
PCI2PCI
Bridge
Bridge
Slots 2, 4, 6
Slot 0 (if 0 cont.)
GBIC
RJ45
10/100/1000
MAC
BCM1250
Cisco Systems, Inc.
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Console
Aux
Compact
Flash