Added new descriptions of Cisco backbone routers.

Cisco backbone routers of the 7200, 7500 and 7600 series are among the
best families
of backbone equipment in their price category,
providing high performance
and port density, extended support
for network protocols and technologies, full
redundancy, the highest reliability and
a distributed approach to data processing.

Full descriptions of routers:

  
• Cisco 7200Cisco 7500

  
• Cisco 7600

  
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