Unlicensed frequencies in the US are Mhz, 2. Now when planning a licensed link or path be prepared to answer these questions below to begin the process: - GPS details per each site. Going with licensed is just a way on insuring the operator that he will not have any interference.
This gives that license holder exclusive rights to broadcast on that frequency and specified channel band within a geographical area these licenses usually are assigned for up-to 10yrs and can be renewed for a fraction of the original licensing fee. This allows for several devices and platforms to utilize the different spectrums or airwaves simultaneously, these spectrums are then divided out creating frequency bands. If you need connectivity for voice and data to go to several points on a network within a specified distance, such as a subdivision of homes or a business park, then point-to-multipoint will probably be your preferred method of connection.ĭo you require licensed or unlicensed frequency? Wireless technology uses airwaves that transmit and receive information-or data.
Some items, such as large antennas, that require freight shipments do not qualify for free shipping. That's it! Additional shipping options are available at an additional charge. Just register with a user name and password. Available to anyone, club connect allows WLANmall registered members access to thousands of unpublished discounted prices and free shipping. In our next blog, we will review some specific vendors and their strengths and weaknesses in each of these areas. Knowing the answers to these questions will help you and your solution provider determine solutions that work best for you. But anything which does have a standard behind it will not be allowed in many industries such as telecommunications and power utilities.Posted by Tee Wright on June 15, We get a lot of questions from Wireless ISPs who want to set up an outdoor-based wireless networking solutions to provide connectivity to one point or several points. You can, of course build a non-standard version of NTP which changes the message rates, and includes a different client servo algorithm. However, the NTP standard mandates a message rate and client servo loop which is designed to achieve millisecond timing. It is true that NTP does not preclude hardware timestamping. 2007 ford van fuse diagram diagram base website fuse
I wish more people had the clarity of thought and expression to take a complex topic and make it nice and simple to understand. The exact information that I was looking for. The good news is that many of these properties are gradually being added to the world of IEEE so soon you will be able to have the ease and robustness of NTP with the accuracy of the Hadron Collider. The bottom line is that NTP has been around several decades, and has become cheap easy and robust. The client gets time from all of the servers and ignore one which seems to be too far off in time compared to the other servers. In the case of PTP a slave synchronizes to a master clock, which other masters listen in, so that they can take over if the active master goes away for any reason.
Most system integrators buy dedicated servers, since that saves them the trouble of integrating a GPS receiver to get standard time with an NTP server.īut each server can keep thousands of clients happy and on time. NTP is cheaper, because the clients are free, and no special switches are required.
You can also easily download and install free software that contains a list of know NTP servers and their addresses. Just point each client to which address to ask for time and its good to go. NTP is easier to implement because free NTP clients are already included with just about any computer, server or router you buy. But if PTP is more accurate why not use it for everything? There is even ongoing standards work to use technology developed at CERN. The solution is to use special switches and routers called transparent clocks or boundary clocks. Hardware timestamping is allowed in the client and server devices which are running NTP, but not many devices out there implement this.įurthermore the biggest source of error in network timing is often due to the variations in queuing time in switches and routers. And the answer is due to the fact that hardware timestamping is commonly implemented in PTP technology, but not in NTP. I wrote earlier about why PTP is so accurate. If the answer is in milliseconds or seconds, then you want NTP. I simply ask them what time transfer accuracy do they need. I get asked a lot of questions from customers about network timing technology.