Neo 1973 and Neo FreeRunner gsm modem - Revision history

Glenn: /* Eliminating echo on the non-neo end (far end) of phone calls */ +link

2012-02-12T06:34:05Z

‎Eliminating echo on the non-neo end (far end) of phone calls: +link

2011-11-23T08:50:04Z

‎GMM Information (2,10): Add Wikipedia:Mobility_management

2011-11-23T05:30:43Z

‎AT%Nxxxx: Add Wikipedia: Echo_cancellation#Acoustic_echo_cancellation & Noise_reduction#In_audio

2011-11-23T02:02:11Z

‎PDP Information (2,13): Add Wikipedia: Packet_Data_Protocol#PDP_Context & X.25 & Frame_Relay

2011-11-23T01:23:12Z

‎AMR Configuration Information (2,12): Add Wikipedia:Adaptive_Multi-Rate_audio_codec

2011-11-23T01:16:32Z

‎GRLC Information (2,11): - Add Wikipedia:Circuit_Switched_Data (CSD)

2011-11-21T18:13:32Z

‎Location and Paging Parameters (2,4): Add Wikipedia:Periodic_location_update

2009-04-11T23:37:27Z

‎Eliminating echo on the non-neo end of phone calls: AT%N

2009-04-02T00:43:26Z

‎Software implementation: Flashing FW now possible

2009-02-05T06:58:46Z

‎GMM Information (2,10)

@@ Line 663: / Line 663: @@
 This echo issue isn't considered to be fixable for good by modifying mixer-settings, as you always get a tradeoff resulting in either low earpiece volume or poor mic-sensitivity.
 [[Category:Neo1973 Hardware]]
 [[Category:Neo FreeRunner Hardware]]
 [[Category:GSM]]

@@ Line 428: / Line 428: @@
   OK
 ===== GMM Information (2,10) =====
-GSM MM (Mobility Management) protocol
+GSM MM ([https://en.wikipedia.org/wiki/Mobility_management Mobility Management]) protocol
 Response format:
   %EM: < >,< >,< >,< >,< >,< >,< >,< >

@@ Line 448: / Line 448: @@
 ==== AT%Nxxxx ====
-AEC and Noise reduction.
+[https://en.wikipedia.org/wiki/Echo_cancellation#Acoustic_echo_cancellation AEC] and [https://en.wikipedia.org/wiki/Noise_reduction#In_audio Noise reduction].
 This commands can be used to activate builtin echo suppression and

@@ Line 444: / Line 444: @@
 ===== PDP Information (2,13) =====
-Packet Data Protocol, e.g. IP, X.25, FrameRelay
+[https://en.wikipedia.org/wiki/Packet_Data_Protocol#PDP_Context Packet Data Protocol], e.g. IP, [https://en.wikipedia.org/wiki/X.25 X.25], [https://en.wikipedia.org/wiki/Frame_Relay FrameRelay]
 {{todo|Fill in}}

@@ Line 440: / Line 440: @@
 ===== AMR Configuration Information (2,12) =====
-Adaptive Multi-Rate Speech Codec
+[https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec Adaptive Multi-Rate Speech Codec]
 {{todo|Fill in}}

@@ Line 435: / Line 435: @@
 ===== GRLC Information (2,11) =====
 General RS232 Logical Channel - This channel can handle the 07.07/07.05
-AT command set (CSD, FAX, GPRS, Voice, Network AT, and so on.)
+AT command set ([https://en.wikipedia.org/wiki/Circuit_Switched_Data CSD], FAX, GPRS, Voice, Network AT, and so on.)
 {{todo|Fill in}}

@@ Line 295: / Line 295: @@
 |1 || bs_pa_mfrms || BS PA MFRMS paging repeat period
 |-
-|2 || t3212 || Periodic location updating interval
+|2 || t3212 || [https://secure.wikimedia.org/wikipedia/en/wiki/Periodic_location_update Periodic location updating interval]
 |-
 |3 || mcc || [http://en.wikipedia.org/wiki/Mobile_country_code Mobile Country Code]

@@ Line 659: / Line 659: @@
 You probably actually want the GSM modem to turn off automatically when you power down the Neo.  Right now, there is no functionality available from the modem while the Neo is powered off, so it's just a waste of power.  See [[GSMPowerDownInitScript]].
-=== Eliminating echo on the non-neo end of phone calls ===
+=== Eliminating echo on the non-neo end (far end) of phone calls ===
-Modify your /etc/gsmhandset.state as specified at the end of [[User:TonyGarnockJones]]
+Issue appropriate AT%Nxxxx command to enable AEC ([http://wiki.openmoko.org/wiki/Hardware:AT_Commands#Echo_Suppression_and_Noise_Reduction Echo Cancellation]) in calypso. Has to be done per-call as it's not "sticky" (=after modem-powerup/init and after every call). Recent GSM-handling-daemons (as of Apr 2009) tend to finally implement this function.
 [[Category:Neo1973 Hardware]]
 [[Category:Neo FreeRunner Hardware]]
 [[Category:GSM]]

← Older revision		Revision as of 00:43, 2 April 2009
Line 584:		Line 584:

	Upgrading the modem's firmware is technically possible but no proper software is currently legally available to users outside Openmoko staff.		Upgrading the modem's firmware is technically possible but no proper software is currently legally available to users outside Openmoko staff.
		+	[edit jOERG 2009-04-02] There's FLUID software and GSM-FW-images as well as a uSD-image for automatic update (this GTA02 for now) now. See [[GSM/Flashing]]

	== Power On, Power Off, and Reset of the GTA01 GSM Modem ==		== Power On, Power Off, and Reset of the GTA01 GSM Modem ==