Airlogic ABM-400 Bedienungsanleitung PDF herunterladen (Seite 46)

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The RFCOMM protocol allows applications which utilize a serial port to communicate

via Bluetooth by presenting legacy serial based applications with a virtual serial port. In this

way, devices can utilize programs which facilitate traditional networking, file sharing, and peer

to peer communications. Many applications and devices currently use serial ports for

communication, making the RFCOMM portion of the protocol stack an important part of

Bluetooth.

One of the most important features of Bluetooth piconets is the ability to form on the fly.

The fluid creation and use of these networks requires a means for the nodes on the piconet to

discover the services available to them. To this end, the Service Discovery Protocol allows nodes

to interrogate each other as to the services they can offer. Once the SDP informs communicating

nodes as to the services available to them, normal piconet operations can make use of those

services.

The decision making body known as the Infrared Data Association created several

important protocols and communication standards for use with Infrared Devices. In order to

promote communication between Bluetooth nodes and other wireless devices, the SIG decided to

add the IrDA protocol layer to the stack. This protocol layer allows intercommunication between

devices that "speak" the IrDA protocol and Bluetooth nodes.

The final distinct layer of the Mid-level protocols is the TCS, or Telephony Control

Specification. The telephony layer dictates the ways in which a Bluetooth device sets up audio

transmissions. Once the call is established, the call is routed through the standard Bluetooth

audio channels. The TCS can also establish a call in the fashion of a modem (to support the

network access usage models above). Once the connection is made, the data is shunted through

the L2CAP layer, as normal. The TCS is a vital part of making Bluetooth devices a reliable two-

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Airlogic ABM-400 Bedienungsanleitung Seite 46