Intertek Testing Services
Ericsson Inc.
Model: DT-620
FCCID: AXAROA1173201
Report Name: ERI2433.DOC
12 of 28
3.2.13 Channel Allocation §15.323 (a)
Operation shall be contained within one of the eight 1.25 MHz channels starting with 1920 – 1921.25 MHz
and ending with 1928.75 – 1930 MHz. Further sub-division of a 1.25 MHz channel is permitted with a
reduced power level, as specified in §15.319 (c), but in no event shall the emission bandwidth be less than
50 kHz.
Frequency (MHz)
Measured Emission Bandwidth (kHz)
1920.625
824
1925.625
824
1929.375
822
The DT-620 operates in the following channels:
Channel Number
Center Frequency
MHz
0
1929.375
1
1928.125
2
1926.875
3
1925.625
4
1924.375
5
1923.125
6
1921.875
7
1920.625
The DT-620 uses Time Division Multiple Access (TDMA) technology. Each channel is divided into 10
msec frame periods, this is further divided into twenty-four time-slots of 416.7 (sec. The frame is divided
in half. The first twelve slots of the frame are the downlink slots, (RFP to PP) and the second twelve slots
are the uplink slots (PP to RFP). Below is a diagram showing how the 10 msec frame is subdivided and
how each slot is divided into 480 bits:
3.2.14 15.323 (b), §15.323 (c) (1) through §15.323 (c) (12)
The tests to demonstrate compliance to these sections were performed at Ericsson Inc. The test report is
enclosed in Appendix B.
