Cisco 7200 VXR router User Manual page 86

Site Requirement Guidelines
twisted-pair cabling. The distance and rate limits in the following descriptions are the IEEE
recommended maximum speeds and distances for signaling; however, you can usually get
good results at speeds and distances far greater than these. For example, the recommended
maximum rate for V.35 is 2 Mbps, but it is commonly used at 4 Mbps without any
problems. If you understand the electrical problems that might arise and can compensate
for them, you should get good results with rates and distances greater than those shown
here; however, do so at your own risk.
Note
limits.
When preparing your site for network connections to a Cisco 7200 VXR router, you must
consider a number of factors related to each type of interface:
•
The type of cabling required for each type (fiber, thick or thin coaxial, shielded
twisted-pair, or unshielded twisted-pair cabling)
•
Distance limitations for each signal type
•
The specific cables you need to connect each interface
•
Any additional interface equipment you need, such as transceivers, hubs, switches,
modems, channel service units (CSUs), or data service units (DSUs)
•
Cable pinouts if you plan to build your cables
The specific interface information you need is contained in the documentation that is
shipped with each port adapter. For example, if you need ATM distance limitations and
pinouts, refer to the PA-A3 Enhanced ATM Port Adapter Installation and Configuration
document. This document accompanies each PA-A3 port adapter that is shipped from the
factory as an installed item in a Cisco 7200 VXR router and as a FRU.
Before installing a Cisco 7200 VXR router, have all additional external equipment and
cables on hand. For ordering information, contact a customer service representative.
2-18 Cisco 7200 VXR Installation and Configuration Guide
We recommend that you do not exceed specified transmission rate and distance