T68i
White Paper, April 2002
30
Infraredtransceiver
Infraredcommunication creates a data link
betweentwo communi cations devices through an
infraredbeam of light. On the T68i, this link is
used to connectwith desktop computers, PDAs,
Sony Ericssonhandheld computers, laptop PCs,
other phones (for example, the T39), and other
hardwaresupporting the standard. The Infrared
Data Association(IrDA) has set the hardware and
softwarestandards that form the infrared
communicationlinks. The T68i complies with the
IrMC 1.1 specification,which defines how mobile
telephonyand communication devices can
exchange information. In the T68i, the IrMC 1.1
specificationis also used for communication via a
cable.
Key benefits of using the T68i with its built-in
infraredtransceiver:
• Truewireless communication
• Low power consumption
• SecuredatatransmissionwiththeIrDA
DATAstandard
• Abilityto send and receive e-mail and data
on the connected PC/PDA
• Ability to connect to the Internet or intra-
net/LAN from the connected PC/PDA
• Ability to managethe phone book from a
PC
• Exchangeof business cards and calendar
eventsw ith vCard/vCalendarcompatible
devices
• Exchange of ringsignals between compati-
ble phones
• Ability toattach a photo from a digital cam-
era in outgoing e-mail

Connection via infrared

IrDAis a point-to-point communication link
between two infraredports. The infrared beam
hasto be directed towards the target infrared port
and as long as thetwo infrared ports are within
sight and range,the devices exchange data. For
optimal performance,place the T68i within a
metreand at an angle of 30 degrees to the
infraredport on the PC/PDA, or other phone. An
advantageof the necessary proximity of devices
is reduced risk of transmitting data to other
nearbydevices. An infrared link is a serial
connection,which means that data bits are sent
one afteranother in a long stream. The IrDA–SIR
Data Link Standard is a protocol that makes
transmission of data faultless. The standard
provides a high level of noise immunity, which
means thatthe connection is not affected by
fluorescentlight, sunlight and electromagnetic
fields – making it suitable for the modern office
environment.

Connection via cable

The infrared connection is not always the best
solutionwhen connecting to a PC/PDA. Indeed, it
is not always evenpossible. The DRS-11 cable
provides the same connectivity between the
phone and another unit.
The DRS-11cable supports a subset of the
signals in the RS-232 standard, as detailed in
“Infraredtransceiver technical data” on page 69.