Évaluations - 3, GPA: 4.3 ( )

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Table 8 — RF Signal Barriers BARRIER SEVERITY Concrete Wall High Metal Wall High Wood Framed Wall Moderate Glass Low Trees Low to High depending on type (high = Pine) People High (mount antenna above pedestrian traffic) Vehicular Traffic High Frequently Asked Questions (FAQs) Q: Can I use an external antenna? A: Yes, many different versions of 2.4 GHz omni-directional or directional antennas can be used. Please contact Carrier for additional information. Q: Can I use other, longer runs of coax than what is provided from Carrier? A: Yes. Longer coax can be used but one should keep the length of the coax as short as possible and use low loss coax as appropriate for the length of the run. Q: What types of coax can I use? A: RG-316, RG-223, LMR240, 300, 400, 600 and many other types that are suitable for 2.4 GHz RF signals. It is important to choose a low loss coax and realize that the longer the coax the greater the loss. Also, remember that the Carrier transceivers have a reverse thread SMA female connectors only so your coax will need to mate with that. Q: How great a length of coax can I use? A: It depends on type of coax. A very low loss coax can be used at distances up to roughly 50 ft. It is critical, however, that the correct coax and connectors are used and that the coax system loss is not too great. The maximum power out of a Stand- Alone Carrier Transceiver at the reverse thread SMA connector is 500 mW. Q: When should I use a directional antenna versus an omnidirectional antenna? A: A directional antenna is a good choice any time you have only a specific direction from which signals are sent or received. If you have a Host (master) Carrier transceiver and there are Remote Carrier transceivers in all directions from the Host you should use a directional antenna in most if not all cases. A directional antenna can extend your range by concentrating the radiated energy from the antenna in a certain direction. Also, a directional antenna will only receive signals that are in its specific angle reception. RF interference outside the antennas area will not be ‘visible’ by the antenna and in this way can increase the transceivers receive capability. Q: The range specification with omni-directional antennas is 2 miles. Does that require line-of-sight? A: Yes it does. If the range between antennas is short, say 1000 ft and there are no major obstructions such as earth, major metallic structures or other obstructions, chances are good that an acceptable RSSI (receive signal strength indication) will be achievable at each transceiver. The problem is, every applications environment is different and there is no way to know for sure unless one tests the units in that actual physical setting. Q: How much does line-of-sight matter with Carrier transceivers? A: As a general rule, line-of-sight is required to assure communications. The Carrier transceivers operate at 2.4 to 2.4835 GHz with a maximum power output of 500 mW. The transceiver’s ability to receive adequate signal levels is entirely dependent on the placement of the antennas and the distance they are from one another. There is no absolute guarantee in advance that a given installation of Carrier transceivers will yield a good communication link. However, if the range is under 1000 ft, adequate communication can be accomplished in many cases without line-of-sight as long as the proper antennas have been selected and installed as required. In general, with ranges up to and exceeding 1500 ft, line-of-sight is required. 14 Q: Should I incorporate lightning surge protection for my transceiver? A: It is a good idea whenever your coaxial cable lengths are 20 feet or more. Contact your Carrier representative. Q: What is the highest baud rate of the Carrier RS-485 adapter? A: 9600 Baud. Q: How many network IDS are available? A: 64,000 Q: How can I improve communications indoors? A: Try using directional antennas to lessen or eliminate bouncing signals being received from the remotes. Q: Is it possible for CCN communication retries to happen because of wireless interference? A: Yes, although Carrier wireless modems are designed to avoid communication interruption, it is possible for the user to see duplicate alarms on a ComfortWORKS® or Comfort- VIEW™ display due to wireless interference. Q: Are there limits to the application of wireless CCN communications? A: Yes. As with any wireless communication, the transceiver can be interfered with by a physical blockage or electrical interference. Carrier wireless transceivers should NOT be installed in applications where temporary loss of communications cannot be tolerated by the control system. Suitable applications include equipment monitoring, alarm monitoring, control overrides and temporary service connections. 15 Copyright 2001 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. 4 PC 111 Catalog No. 533-37...

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