Bluetooth; Specifications - Ricoh Aficio 2035e Service Manual

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3.5 BLUETOOTH

Bluetooth wireless provides radio links between mobile computers, mobile phones

and other portable handheld devices.

Bluetooth contains the following features.

• Cheaper compared to the IEEE802.11b wireless LAN.

• Many protocols for infrared transmission (IrDA) can be used with Bluetooth.

• A Bluetooth device can connect to other Bluetooth devices without any settings.

Standard applied:

Data transfer rates:

Piconet. Bluetooth devices communicate with each other device in the ad hoc

mode. This network is called a "Piconet". A Piconet may contain a maximum of 8

Bluetooth devices.

There is one master device and seven slave devices in a Piconet. The master

device controls the hopping frequency and timing, as well as storing the ID codes

of the slave devices. The master and slave devices can be swapped. Once the

master device leaves the Piconet, a slave device becomes the new master.

Machines with the Bluetooth option become potential slave devices to connect to

FHSS (Frequency Hopping Spread Spectrum). The Bluetooth device divides

2402 to 2480 MHz into 79 channels of 1 MHz width, and changes the channel 1600

times per second. If other devices in the LAN are using the same radio band,

Bluetooth can avoid interference from the other devices.

Bluetooth 1.1 (Bluetooth Special Interest Group)

2.4GHz Frequency Hopping Spread Spectrum (FHSS)

B654D910.WMF

G081D925.WMF

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Aficio 2045e B135 B138