Service manual

Specifications (C257/C261) C257/C261
8 July 1, 2005
Transmitter Functions Specification
RF Power Output 32.5 dBm nominal GSM900
30 dBm nominal DCS1800
32.5 dBm nominal GSM850
29.5 dBm nominal PCS1900
Output Impedance 50 ohm (TYP)
Spurious Emissions -36 dBm from 0.1 to 1GHz,
-30 dBm from 1 to 4GHz
Receiver Functions Specification
Receiver Sensitivity -107 dBm GSM 850/GSM900
-106 dBm DCS1800/PCS1900
RX Bit Error Rate (100K bits) type II <2%
Channel Hop Time 500 microseconds
Time to Camp Approximately 6~10 Second
Speech Coding Functions Specification
Speech Coding Type Regular pulse excitation/linear predictive
coding with long term prediction (PRE
LPC with LTP)
Bit Rate 13.0 Kbps
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 Kbps