Chapter 2 Preparing for Installation
Provisioning the Headend
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, and 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.
Caution We recommend that you do not exceed specified transmission rate and distance limits.
When preparing your site for network connections to the Cisco uBR 3x10 RF Switch, you must consider a number of factors related to each type of interface:
•The type of cabling required for each type of interface (fiber, thick or thin coaxial, shielded
•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, CSUs, or DSUs
•Cable pinouts if you plan to build your cables
Equipment Racks
The
When planning your rack installation, follow these guidelines:
•Install the Cisco uBR 3x10 RF Switch in an open rack whenever possible. If installation in an enclosed rack is unavoidable, ensure that the rack has adequate ventilation.
•If you plan to use an equipment shelf, ensure that the shelf is constructed to support the weight and dimensions of the chassis.
•Always install heavier equipment in the lower half of a rack to maintain a low center of gravity and prevent the rack from falling.
•Ensure that you have access to the front and rear of the unit.
•Position the Cisco uBR 3x10 RF Switch close enough to the Cisco CMTS in which the cable interface line cards are installed to be sure you have enough cable to reach the furthest interfaces.
•Before using a specific rack, check for obstructions (such as a power strip) that could impair
–If a power strip does impair a rear
–As an alternative, mount the Cisco uBR 3x10 RF Switch on an equipment shelf if the rack dimensions allow you to secure the router to the shelf and the overall configuration permits safe installation and access. However, we recommend
RF Switch.
•Review the precautions for avoiding overtemperature conditions in the “Site Environment” section on page
•To properly install the Cisco uBR 3x10 RF Switch chassis in a rack, refer to the instructions in the
Cisco
| ||
|
