Tip & How-To about Electronics - Others

Bluetooth Basics ? How it works


Network Topology
Any Bluetooth device can be a master or a slave, depending on the application scenario.
Bluetooth employs frequency hopping spread spectrum (FHSS) to communicate. So in order
for multiple Bluetooth devices to communicate, they must all synchronize to the same
hopping sequence. The master sets the hopping sequence, and the slaves synchronize to the
Master.
A piconet is formed by a master and up to seven active slaves. The slaves in a piconet only
communicate with the master.
A scatter net can be formed by linking two or more piconets. When a device is present in
more than one piconet, it must time-share and synchronize to the master of the piconet with
which it is currently communicating.
While the topology and hierarchical structure of WLAN networks are relatively simple,
Bluetooth networks are far more diverse and dynamic. They are constantly being formed,
modified, and dissolved, as Bluetooth devices move in and out of range of one another. And
because different Bluetooth devices can represent many different usage profiles, there are
many different ways in which Bluetooth devices can interact.
Service Discovery
The concept of service discovery is utilized to determine what kind of Bluetooth devices are
present and what services they desire or offer. When a Bluetooth device requires a service, it
begins a discovery process by sending out a query for other Bluetooth devices and the
information needed to establish a connection with them. Once other Bluetooth devices are
found and communication is established, the Service Discovery Protocol (SDP) is utilized to
determine what services are supported and what kinds of connections should be made.
In order for the above to happen, devices willing to connect must be located. Some devices
may be set up so that they are invisible. In this case, they can scan for other Bluetooth
devices, but will not respond if they are likewise queried. Applications determine whether a
device is connectable or discoverable, and thus applications determine the topologies of
networks and their internal hierarchies.

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Bluetooth


What you need to do is take your phone to a service center and have them reflash the firmware, that will correct the bluetooth problem.

Jan 17, 2008 | Motorola Mobility RAZR V3i Cellular Phone

2 Answers

I dont understant about Ethernetpedia app some people says that its an informative app for those person which want to know about networking cables?


In layman's terms Ethernetpedia is a user manual/step by step guide for fixing the network cables

The Ethernetpedia application is about helping customers to understand the in depth of networking cables that are used to connect one network device to other network devices to share printer, scanner etc. Different types of network cables are used depending on the network's topology, protocol ,size and structure. The comparison sheet option is included for the enhancement of a customer for the proper knowledge of the cables. This application includes the product information of major cables like Cat5e , Cat6e etc .Easy to use diagram, straight and crossed cables as the installation guide provides you the easy solution for the installation of cables. The application is available in English at the moment will be updated in different languages afterwards.

Dec 06, 2014 | Microsoft Computers & Internet

1 Answer

bluetooth handsfree problem


Bluetooth uses a technique called spread-spectrum frequency hopping. It changes frequencies 1,600 times every second. A frequency of 2.45 gigahertz (actually between 2.402 GHz and 2.480 GHz, to be exact). For the bluetooth device to work at 100% it needs to be 100% compatiable. More than likely, if you change your earpiece device, you should be able to pickup your songs. If you go to the VerizonWireless website, they should have 100% compatiable devices.

 

Todays Tivia:

Why is it called Bluetooth?

Harald Bluetooth was king of Denmark in the late 900s. He managed to unite Denmark and part of Norway into a single kingdom then introduced Christianity into Denmark. He left a large monument, the Jelling rune stone, in memory of his parents. He was killed in 986 during a battle with his son, Svend Forkbeard. Choosing this name for the standard indicates how important companies from the Nordic region (nations including Denmark, Sweden, Norway and Finland) are to the communications industry, even if it says little about the way the technology works.

Oct 20, 2007 | Motorola Mobility RAZR V3i Cellular Phone

1 Answer

tcp slave messages are not forwarded to rtu master


I think your last sentence there might be what the situation really is.  Your not getting a reply back. Maybe you should check the response timeout the gateway has set on it for the slave.  You probably already know a slave’s response time can fluctuate wildly depending on the nature of the request sent, so maybe the timeout setting is too short? Its a place to start. .

Aug 03, 2006 | Lantronix (200.2071)

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