Specifications

XT55 Hardware Interface Description
Confidential / Preliminary
s
mo b i l e
XT55_hd_v00.02 Page 104 of 116 17.03.2004
6.7 Air interface of the XT55 GSM/GPRS part
Test conditions:
All measurements have been performed at T
amb
= 25°C, V
GSM_BATT+ nom
= 4.1V. The reference
points used on XT55 are the GSM_BATT+ and GND contacts (test points are shown in
Figure 52).
Table 34: Air Interface
Parameter Min Typ Max Unit
E-GSM 900 880 915 MHz
GSM 1800 1710 1785 MHz
Frequency range
Uplink (MS ® BTS)
GSM 1900 1850 1910 MHz
E-GSM 900 925 960 MHz
GSM 1800 1805 1880 MHz
Frequency range
Downlink (BTS ® MS)
GSM 1900 1930 1990 MHz
E-GSM 900
1)
31 33 35 dBm
GSM 1800
2)
28 30 32 dBm
RF power @ ARP with 50" load
GSM 1900 28 30 32 dBm
E-GSM 900 174
GSM 1800 374
Number of carriers
GSM 1900 299
E-GSM 900 45 MHz Duplex spacing
GSM 1800 95 MHz
GSM 1900 80 MHz
Carrier spacing 200 kHz
Multiplex, Duplex TDMA / FDMA, FDD
Time slots per TDMA frame 8
Frame duration 4.615 ms
Time slot duration 577 µs
Modulation GMSK
E-GSM 900 -102 -107 dBm
GSM 1800 -102 -106 dBm
Receiver input sensitivity @ ARP
BER Class II < 2.4%
GSM 1900 -102 -106 dBm
1)
Power control level PCL 5
2)
Power control level PCL 0