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In addition to planning the transmission path, modifications might be required for the physical area housing the equipment. This chapter outlines some planning considerations concerning the installation of the components of the broadband fixed wireless system.
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Note The wireless transverter discussed in this document must be purchased from a third-party vendor. Refer to that vendor's documentation for information and installation instructions. |
This section outlines installation considerations for the Cisco uBR7200 series universal broadband routers. Refer to the Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide for additional information.
A fully configured Cisco uBR7223 weighs approximately 75 pounds (34.0 kilograms), and a Cisco uBR7246 or Cisco uBR7246 VXR weighs approximately 100 pounds (45.4 kilograms). These chassis are not intended to be moved frequently. Before you install the router, be sure that your site is properly prepared so you can avoid having to move the chassis later to accommodate power sources and network connectors.
For systems with installed AC-input power supplies, the routers ship with a 3-wire electrical grounding-type power outlet. This is a safety feature. The equipment grounding should be in accordance with local and national electrical codes.
For systems with installed DC-input power supplies, the routers do not ship with any power cables. Use a minimum of 12 AWG (3.91 mm2) wire for the input to each DC-input power supply. The equipment grounding should be in accordance with local and national electrical codes.
The environmental monitoring function in the Cisco uBR7246 and uBR7246 VXR protects the system and components from potential damage from overvoltage and overtemperature conditions. To assure normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site before installation. After installation, make sure the site maintains an ambient temperature of 32ºF to 104ºF (0ºC to 40ºC), and keep the area around the chassis as free from dust as is practical.
Table 3-1 lists environmental monitoring specifications that apply to the Cisco uBR7223, the Cisco uBR7246, and the Cisco uBR7246 VXR.
| Specification | Minimum | Maximum |
|---|---|---|
Temperature, ambient operating | +32F (0C) | 104F (+40C) |
Temperature, ambient nonoperating and storage | -4F (-20C) | 149F (+65C) |
Humidity, ambient (noncondensing) operating | 10% | 90% |
Humidity, ambient (noncondensing) nonoperating and storage | 5% | 95% |
Altitude, operating and nonoperating | — | 10,000 ft. (3050 m) |
Vibration, operating | — | 5 to 200 Hz, 0.5 g (1 oct./min.) |
Vibration, nonoperating | — | 5 to 200 Hz, 0.5 g (1 oct./min.) |
Cisco recommends rack-mounting the routers. The rack-mounting hardware included with the routers is suitable for most 19-inch equipment racks and telco-type racks. For maintenance purposes, you should have access to the front and rear of the router.
Maintain a minimum clearance of 3 inches on the right and left of the chassis for the cooling air inlet and exhaust ports. Avoid placing the router in an overly congested rack or directly next to another equipment rack; otherwise, the heated exhaust air from other equipment can enter the inlet air vents and cause an overtemperature condition inside the router.
If the router will be installed in the same equipment rack as the power feed panel(s), place the router in the lower half of the rack and the power feed panel(s) above it. The rack is more stable when the router, which is heavier, is below the power feed panel(s). Allow a minimum of one rack unit space between the router and power feed panel.
This section outlines installation considerations for the Cisco uBR-MCW-PDA wireless modem card. Refer to the Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration document for additional information.
Environmental conditions for the wireless modem cards reflect those of the router housing them. To provide the proper flow of cooling air across the internal components of the router, blank modem cards (faceplates) should be installed in unused modem card slots.
This section outlines installation considerations for the Cisco uBR-WPFD power feed panel. Refer to the Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration document or Cisco Broadband Fixed Wireless System Power Feed Panel Replacement Instructions for additional information.
Environmental conditions for the power feed panel are similar to those of the Cisco uBR7200 series router (see Table B-4).
The power feed panel can be installed in a 19-inch equipment rack or telco-type rack along with the router or in a separate rack, and a bracket kit is supplied for that purpose. As with the router, you should have access to the front and rear of the unit for maintenance.
Maintain a minimum clearance of 3 inches on the right and left of the power feed panel, and at least one rack unit space between the router and power feed panel.
DC power supplied to the power feed panel may exceed the safe limits for unrestricted access. In cases where the equipment rack will be more generally accessible, a cabinet-enclosed rack with a locked door can be used.
The power feed panel can be attached to a wall inside the building, using the same bracket kit supplied for rack-mounting. If the unit is to be attached to a wall, the brackets must be attached to a structural element sufficient to support the weight of the unit and attached cables.
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Note To meet safety requirements, the power feed panel must be installed with the rear panel connectors pointing up. |
A short run of small diameter 50-ohm coaxial cable is used to connect the wireless modem card to the power feed panel. DC power used to power the wireless transverter is added to the coaxial cable within the power feed panel. A large diameter coaxial cable exits the power feed panel and is used for the connection to the wireless transverter.
Cable lengths up to 1000 feet total are supported between the power feed panel and the wireless transverter. Depending on length, use a cable size that complies with local and national electrical codes.
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Warning Use 50-ohm coaxial cable with a center conductor size of 10 AWG or larger (for example, LMR-400, 3/8-inch FSJ Superflex Heliax, or larger). Failure to do so can result in overheating, fire, or long-term failure. Local and national electrical codes must be observed. To see translations of the warnings that appear in this publication, refer to Appendix C, "Translated Safety Warnings." |
Control cables use standard, shielded CAT-5 cable. Three types of cable might be needed: Indoor (normal), outdoor cable that is UV tolerant and weather resistant, and indoor cable that is plenum-rated.
The installation might require metallic conduit containing both the control cable and coaxial cable to within a few inches of the wireless transverter. The conduit might eliminate the need for the control cable to be shielded and UV protected. The conduit might also eliminate the need for plenum-rated cable.
Clearly label both ends of all cables using a durable material. The labels should include:
You can use any 50-ohm coaxial cable as long as the total loss (including the cable, power feed panel, and connectors) between the wireless modem card and the transverter is less than 12 dB at 400 MHz, the total DC resistance of the inner and outer conductors is less than 1.6 ohms, and the size of the inner conductor is at least 10 AWG (0.1019 in., 2.588 mm diameter).
Use N-type, hex-nut connectors that meet the IP-65 rating for dust and water resistance.
Indoor coaxial cable must be plenum-rated if it is used without conduit inside walls or ceilings. If conduit is used, or if the cable is not run inside walls or ceilings, it is possible that any rating can be used. Plenum ratings requirements are dependent on local building code.
Use N-type, hex-nut connectors that meet the IP-65 rating for dust and water resistance.
Outdoor control cables must be CAT-5 rated, shielded, and rated for outdoor use.
Indoor control cables must be shielded and CAT-5 rated. The cables must be plenum-rated if they are used without conduit inside walls or ceilings.
If the cables run inside walls or ceilings and conduit is used, or if the cables do not run inside walls or ceilings, plenum-rated cables may not be required. Plenum rating requirements are dependent on local building codes.
The transverter control cable, which connects the power feed panel to the transverter, is one logical cable. However, two or more physical cable segments can be used. Regardless of the number of segments used, the transverter control cable must include lightning protection between the transverter and the power feed panel.
Any cable that is entirely or partially outdoors must be outdoor rated. Cables that are completely indoors do not have to be outdoor rated. Whether plenum cable(s) must be used depends on the installation and the local electrical codes. The cable(s) may be solid or stranded, but if you use the punch-down style of lightning protector, the cable(s) must be solid.
Be sure that some form of two-way communications is available at each end of the link. This is necessary both for safety reasons and for performing installation, maintenance, and troubleshooting. Emergency contact numbers should be posted on or near the communications devices.
You can perform an RF module loopback with or without an antenna attached to the transverter.When an antenna is attached to the transverter, some transmit power is radiated during loopback. When the transverter has no antenna attached, an RF termination device must be used during loopback. Attach the device to the duplexer port. Appendix A, "Configuration and Ordering Guide," lists several suppliers of this device.
Posted: Thu Jul 18 17:35:56 PDT 2002
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