User's Manual

LE920 Hardware User Guide
1vv0301026 Rev.8 2015-01-03
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 37 of 88
2.5
Paging cycle #128 frames (1.28 sec DRx cycle)
1.9
Paging cycle #256 frames (2.56 sec DRx cycle)
Operative mode (LTE)
LTE (0dBm)
203
LTE data call channel BW 5MHz,RB=1, TX = 0dBm)
LTE (22dBm)
540
LTE data call (channel BW 5MHz,RB=1, TX = 22dBm)
Operative mode (WCDMA)
WCDMA Voice
185
WCDMA voice call (TX = 10dBm)
WCDMA HSDPA (0dBm)
170
WCDMA data call (Cat 14, TX = 0dBm, Max Throughput)
WCDMA HSDPA (22dBm)
470
WCDMA data call (Cat 14, TX = 22dBm, Max Throughput)
Operative mode (GSM)
GSM TX and RX mode
GSM900 PL5
290
GSM Voice Call
DCS1800 PL0
170
GPRS 4TX + 1RX
GSM900 PL5
410
GPRS Sending data mode
DCS1800 PL0
320
EDGE 4TX + 1RX
GSM900 PL5
255
EDGE Sending data mode
DCS1800 PL0
240
* Worst/best case depends on network configuration and is not under module control.
TIP:
The electrical design for the Power supply must be made ensuring that it will be capable of a
peak current output of at least 2A.
NOTE:
In GSM/GPRS mode, RF transmission is not continuous and is packed into bursts at a base
frequency of about 216 Hz with relative current peaks as high as about 2A. Therefore the
power supply must be designed to withstand these current peaks without big voltage drops;
this means that both the electrical design and the board layout must be designed for this
current flow. If the layout of the PCB is not well designed, a strong noise floor is generated
on the ground. This will reflect on all the audio paths producing an audible annoying noise at
216 Hz; if the voltage drops during the peaks, current absorption is too high. The device may
even shut down as a consequence of the supply voltage drop.