Sony Ericsson Z500A manual Connection via cable

White Paper Z500a

Furthermore, The Z500a is multislot class 10 meaning up to four time slots can be used for downlink data and up to two timeslots can be used for uplink data. This configuration is commonly referred to as 4+2 with a maximum sum of 5. With EDGE, it is possible to achieve a data rate of up to 59.2 kbit/second per time slot when Modulation and Coding Scheme 9 (MCS-9) is used so the Z500a can achieve rates of up to 236.8 kbit/second in the downlink direction and up to 118.4 kbit/second in the uplink direction. These rates are subject to radio conditions.

Data rates per time slot for all of the EDGE coding schemes are given in the following table.

Coding	Modulation	Transmission
Scheme		Rate/Time Slot
		(kbit/second)
MCS-1	GMSK	8.8
MCS-2	GMSK	11.2
MCS-3	GMSK	14.8
MCS-4	GMSK	17.6
MCS-5	8-PSK	22.4
MCS-6	8-PSK	29.6
MCS-7	8-PSK	44.8
MCS-8	8-PSK	54.4
MCS-9	8-PSK	59.2

In GMSK and 8-PSK the input bit sequence is represented by a phase shift of the RF signal. For GMSK, a phase shift occurs for each input bit. For 8-PSK, a sequence of three input bits represents a symbol and leads to the corresponding phase shift. In other words,

each input symbol in 8-PSK causes a phase shift to one of eight defined states. This is illustrated in the following figure.

In GMSK modulation, each input bit		In 8-PSK, each symbol represents
causes a phase shift of ± 90 degrees	to
		three input bits and causes a phase
the RF vector in the IQ plane.
		shift of the RF vector to one of eight
		defined states in the IQ plane.

To minimize amplitude modulation, the 8-PSK scheme illustrated in the previous figure is offset by an angle of 3π/8 in EDGE. This prevents the amplitude from crossing the origin in the IQ plane. The 8-PSK states with the 3π/8 offset are shown in the following figure.

Q

011 111

010110

I

000100

001101

The data rates provided by EDGE open up new possibilities in multimedia, mobile internet access, and basic data services. EDGE provides the next logical step in the development of mobile networks.

Connection via cable

The Z500a supports data connectivity through its system connector. USB and RS-232 connection protocols are supported through available data cable accessories. For GPRS or EDGE data sessions, maximum throughput is made possible with the Z500a providing the air interface for your connected mobile computer.

USB

Employing the user-friendly USB standard, the DCU-11 cable accessory is an easy way to connect your Z500a and PC or PDA. The USB cable is ideal for synchronization or surfing the Internet on a mobile computer through your Z500a phone with improved transmission speeds than previous phone models. Necessary drivers are found on the CD included with the accessory cable.

16 June 2004