of 51 GSM Field Service Support
2
T200 / T2688
2.1 Specifications of T200
General
Function
Specification
Frequency Range GSM
Frequency Range DCS
890-915 MHz TX
915-960 MHz RX
1710-1785 MHz Tx
1805-1880 MHz Rx
Channel Spacing 200 kHz
Channels 124GSM/374 DCS carriers with 8 channels per carrier
Modulation GMSK at BT = 0.3
Transmitter Phase Accuracy 5 Degrees RMS, 20 Degrees peak
Duplex Spacing 45 MHz GSM 95MHz DCS
Frequency Stability + 0.10 ppm of the (Uplink TX)
Operating Voltage Battery Operating Voltage 2.7V – 4.2V (Li-Ion)
3.3V – 4.2V (NiMH)
Transmit Current Typically 250 ma avg, 1.0A peak
Stand-by Current Typically 7.0 ma (DRX2)
Dimensions 112mm x 46mm x 18.5mm
Size (Volume) 78cc
Weight 90g with Battery
Temperature Range -20C to +55C
Transmitter
Function Specification
RF Power Output 33 dBm + 2dB GSM/ 30 dBm + 2 dB DCS
Output Impedance 50 ohms (nominal)
Spurious Emissions -36 dBm from 0.1 to 1 Ghz
-30 dBm from 1 to 4 Ghz
Receiver
Function Specification
RF Level <-120 dBm GSM <-100 dBm DCS
RX bit error rate (100 k bits) < 2%
Channel Hop Time 500 microseconds
Time to Camp Approximately 5-10 seconds
Speech Coding
Function Specification
Speech Coding Type Regular Pulse Excitation / Linear Predictive Coding with Long
Term Prediction. (RPE LPC with LTP).
Bit Rate 13.0 k bps
Frame Duration 20 ms
Block Length 260 bits
Classes Class 1 bits = 182 bits. Class 2 bits = 78 bits
Bit Rate with FEC Encoding 22.8 k bps
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