- This topic has 22 replies, 1 voice, and was last updated 3 years, 7 months ago by Wallis Dudhnath.
21st April 2005 at 04:01 #40918ipoenktGuest
I have echo problem on Mobile to Mobile call and Mobile to PSTN call, I’ve checked all the parameter and connection on Switching (Siemens D900), so far all the parameter meet the standard, but I’m not check yet the BSS side (using Siemens). Do you have any solution that I should do furthermore? Thanks for all your help21st April 2005 at 15:30 #40919Ashish GoelGuest
U can try using the DEC card at the PSTN end. Add a DEC card next to the slot of the LTG where u are facin the problem. Also do not forget to add the INIT parameter in the ENTRPDCCHR command for the E1 on that LTG.
Ashish Goel24th April 2005 at 13:29 #40920ipoenktGuest
Thanks for your reply Ashish, but all the LTGs goin’ to PSTN have connected to DEC and the ECD parameter has set to INT. As far as I know DEC only use
for PSTN, but my case Mobile Station to Mobile station also produces echo, but not in all sites, only several site. Are there any issues regarding the TRAU or BSC? Can I trace the problem using K1205 tester, does anybody know how to use the tester?
Thanks again25th April 2005 at 07:21 #40921IpoenktGuest
Hmm… looks like I found the solution…. I’ve check out the LNDES and found that the trunk going to BSC has to assign ECNEEDED. The problem solve….. funny..23rd December 2005 at 13:14 #40922davidGuest
Hie Ipoenkt, Im interested in the solution you arrived at but have problems undersanding what you wrote here.
We operate an Alcatel Network and have been experiencing echo problems as well.
what was your solution again?26th December 2005 at 08:27 #40923naveenGuest
I just wanted to know if there are any chances of cross connections on air interface. Cos as far cic matching is concerned we cross checked it completly and its fine. And waht i mean by corss connection is that A dials for B and once the connection is through he gets C instead. But the fun part here is B can still listen to what A is speaking, but A hears C’s voice. And i hv no idea what C is hearing at the other end. Did any of u guys face such probs in ur n/w. Hope u guys got the scenario.26th December 2005 at 10:30 #40924Shahzad AfzalGuest
In case of Echo some time its just a loose grounding and power issue, where we can some time connect to some other party or we are getting echo. Kindly check your equipment grounding.27th December 2005 at 07:12 #40925BokoGuest
Check your echo delay. This could tell you where is the problem.27th December 2005 at 07:20 #40926BokoGuest
Crossconection on air interface is not possible. Check your pcma28th December 2005 at 06:45 #40927sameerGuest
One more reason for Echo is Mobile lamination/cover.Coz sometime back we were facing Echo prob.After digging out we found Mobile lamination was thw prob.As it was passing sound waves from Speaker to Microphone again.28th December 2005 at 14:37 #40928BokoGuest
We have this with with the cover also. Alcatel Club was the model I think3rd January 2006 at 22:12 #40929SomaliGuest
I wan to talk about the problems told by naveen. saying,”I just wanted to know if there are any chances of cross connections on air interface”.
Cross connection or cross talk over air is not possible. The problem could be the networking layer where TS are connected to each other. I met this problem before and the problem usually arises from software problems inside the cpu or upgrade problems.11th January 2006 at 08:48 #40930Tech ManGuest
Cross Talk is possible on the air interface if you are using the same BCCH/BSIC combination (when chiphering is not used in your network)at sites which have the possibility of overlapping each other (Need not neccesarily be neighbours!!).12th January 2006 at 04:58 #40931Nitin KhGuest
Crosstalk is the hottalk actually ..Even I encounter it in my network..Well talking bout cross talk on air interface ..Not possible ..I think it has got to do something with the CIC’s ..But Dnt have much knowledge about it?? Any NSS person with any document on these CIC’s
Please mail it to me on firstname.lastname@example.org
Nitin16th January 2006 at 01:37 #40932NarenGuest
1) Cross-talk is possible on Air Interface too as someone explained(when ciphering deactivated).Make Sure your MO authentication is activated when u enable ciphering.
2) Make Sure your BCCH and BSIC combination is Unique.
3) Check with ur Trau modules(Code) Maye be the PCM Timeslot is Overwritten.
4)CIC -mismatch can be a reason too.