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Infrared communication creates a data link between two communications devices through an
infrared beam of light. On the T39, this link is used as a wireless connection with desktop com-
puters, PDAs, Ericsson handheld computers, laptop PCs, digital cameras, 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 T39 complies with the specification IrMC 1.1, which defines how mobile telephony and
communication devices can exchange information. In the T39, a subset of the specification
IrMC 1.1 is also used when communicating via a cable.
Key benefits using the T39 with its built-in infrared transceiver:
• True wireless communication
• Low power consumption
• Secure data transmission
• Support for Medium Speed Infrared (MIR) to provide fast communication
• Support for instant detection of infrared port from a PC running Windows 2000
• Send and receive e-mail and data on the connected PC/PDA
• Connect to the internet or Intranet/LAN from the connected PC/PDA
• Support for connecting via GPRS networks (network-dependent service) also from a PC
running Windows 9x/ Windows Me / Windows 2000
• Manage the phone book and the phone settings from a PC
• Attach a photo from a digital camera via an infrared connection, using IrTranP (Infrared
Transfer Picture)
• Exchange business cards and calendar events with vCard/vCalendar compatible devices
• Exchange ring signals between compatible devices
• Alternatively, if no infrared eye is available, an optional RS-232 cable connection is sup-
ported
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 T39 within a
metre and at a 30 degree angle from the infrared port on the PC/PDA, or other phone. One
advantage of this narrow infrared gap is that the risk of transmitting data to other devices nearby
is minimized. The infrared link is a serial connection, which means that the 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 IrDA–SIR standard provides a high level of noise immunity,
which means that it is not sensitive to fluorescent light, sunlight and electromagnetic fields. This
makes it suitable for a modern office environment.
The infrared connection is not always the best solution when connecting to a PC/PDA. Indeed,
it is not always even possible. The optional DRS-10 cable provides the same connectivity
between the phone and another unit.
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