Distance Limitations - Cisco uBR905 Installation Manual

Chapter 2 Preparing for Installation
If you replace a connector, be careful not to score the center conductor. A scored conductor
Caution
can reduce or impair performance for channels broadcast between 550 and 860 MHz. If
the center conductor is too short, signals between 5 and 42 MHz might be affected.

Distance Limitations

The size of your networks and the distances between connections on the CATV network can affect the
successful installation of a Cisco uBR905 router, which must be within 100 miles of the CMTS. This
distance can also be defined in relation to the speed of light through the transmission network as being
less than 2 msec from the CMTS to the Cisco uBR905 router and back again.
Exceeding this distance is a violation of the DOCSIS RFI specification.
Note
When preparing a site for network connections to the Cisco uBR905 router, consider the following:
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Potential distance limitation problems in the CATV network can be reduced by ensuring the following
factors:
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OL-0598-01 (9/2000)
Number of amplifiers from the installation site to the nearest node
Number of outlets and amplifiers at the installation site
Cable pinouts if you plan to build your cables
Correct, linear unity gain two-way sweep procedure is in place
Industry-standard configuration practices are used at the headend
Downstream frequency is known at the time of installation
Absolute downstream signal level can be measured where it enters the cable access router
Cisco uBR905 Router Hardware Installation Guide
Site Requirements
2-7