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T68i
White Paper, April 2002
30
Infrared
transceiver
Infrared communication creates a data link
between two communications devices through an
infrared beam of light. On the T68i, this link is
used to connect with desktop computers, PDAs,
Sony Ericsson handheld computers, laptop PCs,
other phones (for example, the T39), and other
hardware supporting the standard. The Infrared
Data Association (IrDA) has set the hardware and
software standards that form the infrared
communication links. The T68i complies with the
IrMC 1.1 specification, which defines how mobile
telephony and communication devices can
exchange information. In the T68i, the IrMC 1.1
specification is also used for communication via a
cable.
Key benefits of using the T68i with its built-in
infrared transceiver:
• True wireless communication
• Low power consumption
• SecuredatatransmissionwiththeIrDA
DATA standard
• Ability to 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 manage the phone book from a
PC
• Exchange of business cards and calendar
events with vCard/vCalendar compatible
devices
• Exchange of ring signals between compati-
ble phones
• Ability to attach a photo from a digital cam-
era in outgoing e-mail
Connection via infrared
IrDA is a point-to-point communication link
between two infrared ports. The infrared beam
has to be directed towards the target infrared port
and as long as the two infrared ports are within
sight and range, the devices exchange data. For
optimal performance, place the T68i within a
metre and at an angle of 30 degrees to the
infrared port on the PC/PDA, or other phone. An
advantage of the necessary proximity of devices
is reduced risk of transmitting data to other
nearby devices. An infrared link is a serial
connection, which means that data bits are sent
one after another 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 that the connection is not affected by
fluorescent light, sunlight and electromagnetic
fields – making it suitable for the modern office
environment.
Connection via cable
The infrared connection is not always the best
solution when connecting to a PC/PDA. Indeed, it
is not always even possible. The DRS-11 cable
provides the same connectivity between the
phone and another unit.
The DRS-11 cable supports a subset of the
signals in the RS-232 standard, as detailed in
“Infrared transceiver technical data” on page 69.