Navini Networks, Inc. Ripwave Base Station I&C Guide Base Station Components Base Transceiver Station (BTS) The BTS consists of the RF Power Amplifiers (PAs), the digital circuit cards, the backplane, and the mechanical enclosure or housing. It performs the signal processing and RF transmission for the system. There are three types of chassis: Combo, Split, and Tower Top Amplifier (TTA). The Combo Chassis is used primarily with 2.4 GHz systems. The Split Chasses is used for all other (2.3, 2.5, 2.
Navini Networks, Inc. Ripwave Base Station I&C Guide Radio Frequency Subsystem (RFS) The Radio Frequency Subsystem (RFS) is mounted on a transmission tower or building rooftop. It transmits and receives data to and from the Ripwave Modem using a digital beam forming transmission technique. The RFS may be either a panel antenna or an omni antenna (Figure 6). The RFS data sheets are provided in Appendix E. An RFS panel transmits in a directional mode, covering a transmit angle of 120 degrees.
Navini Networks, Inc. Ripwave Base Station I&C Guide Global Positioning System (GPS) One Global Positioning System (GPS) antenna is used with each Base Station to provide a timing signal for synchronizaton. A second GPS antenna can be provided for redundancy. The Ripwave Base Station uses the VIC 100 GPS Antenna (Figure 7).
Navini Networks, Inc. Ripwave Base Station I&C Guide Technical Specifications Table 2: Technical Specifications COMBO (no longer in production) SPLIT TTA Frequency Band (GHz) 2.4 2.6 2.3 2.5 2.6 2.4 2.6 3.5 Frequency Band (Name) ISM MMDS WCS/ ITFS/ MMDS ISM MMDS BWA/FWA– Frequency Range (GHz) Maximum Power Dissipation (Thermal Load) 2.400–2.473 2.602–2.638 2.305–2.385 2.500–2.596 2.596–2.686 2.400–2.483 2.596–2.686 3.410–3.
Navini Networks, Inc. Ripwave Base Station I&C Guide COMBO (no longer in production) Frequency Band (GHz) 2.4 120° panel Antenna Gain per antenna element (Approximate) TTA 2.3 2.5 2.6 2.6 2.4 2.6 3.
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Navini Networks, Inc. Item TDD SYNC Ripwave Base Station I&C Guide Description Termination TDD Sync is a TTL Sync pulse at 10 ms cycle rate, 0 t0 +5V swing, Test equipment such as which is 5 µs long in width. This oscilloscope or spectrum output of BTS is used for analyzer equipment debugging and to synchronize test equipment The GPS coax cable connected GPS antenna/LNA, which to GPS antenna LNA carries +5 GPS Antenna is normally located at BTS VDC and a 1.57 GHz RF signal.
Navini Networks, Inc. Ripwave Base Station I&C Guide Chapter 2: Installation Pre-installation As was shown in Figure 4, prior to installing the equipment a number of planning and acquisition activities take place. The installation itself takes only about 2 days. The I&C crew may or may not be involved with all the pre-installation activities.
Navini Networks, Inc. Ripwave Base Station I&C Guide A copy of this form may be found in Appendix A. It includes places to capture the logistics of the site, tower or rooftop mount possibilities, GPS coordinates, type of antenna to be installed, whether or not an outdoor enclosure is provided, power availability, distance between connection points, ventilation, a place for drawings from every angle, etc. It is from this information that the site will be designed, then installed to plan.
Navini Networks, Inc. Ripwave Base Station I&C Guide Antenna Power & Cable Selection The size and type of cable used to install the Base Station affect power loss and calibration range for the transmitter and receiver. It is at this point in the process that the specific cable manufacturer, type of cable, and cable size must be determined. A complete procedure and tool are explained in Appendix H.
Navini Networks, Inc. Ripwave Base Station I&C Guide Ground Requirements for the Base Station The Base Station requires an earth ground connection. Grounding from copper point to copper point shall be less than 1 ohm. Grounding from copper point to earth ground shall be less than 5 ohms. All power and ground conductors must be mechanically supported to avoid strain of the wires and connection points. Refer to the Regulatory Information in Chapter 1, Page 8.
Navini Networks, Inc. Ripwave Base Station I&C Guide whether to install the primary protection kit at an extra cost or to rely on the secondary protection only. NOTE: Navini does not warranty equipment against lightning Figure 11: Surge Protectors PSX-ME PSX DGXZ+06NFNF-A 3406.17.0009 3406.17.
Navini Networks, Inc. Ripwave Base Station I&C Guide Antenna Ground Buss Bar You should install the Antenna Ground Buss Bar on the mounting structure per accepted telecom standards and procedures (Figure 13). The location is decided on during the site survey and should be close to the RFS. Two or more buss bars may be installed per system.
Navini Networks, Inc. Ripwave Base Station I&C Guide Install Cables All cable connections in the Combo and Split-Chassis configurations are made using standard RF coaxial cable. The Navini Networks minimum for cable connections from the GPS to the BTS is LMR 400, 3/8-inch coaxial cable. Other types of cable that are comparable may be used. These were determined under “Antenna Power & Cable Selection” (Appendix H) activities cited earlier.
Navini Networks, Inc. Ripwave Base Station I&C Guide Cut Cables for the Combo and Split Chassis Configurations The cable run is determined during the site survey. Note that the length of the cables may need to be slightly different, depending on the position of the buss bar relative to the BTS. • Cut nine (9) pieces of cable for the main feeder cables to connect the nine RFS connectors to the surge protectors on the system ground buss bar.
