- This topic has 5 replies, 1 voice, and was last updated 6 years, 11 months ago by Wallis Dudhnath.
20th June 2004 at 22:09 #38509sivaGuest
Iam new to this site and GSM field.I have a doubt regarding the transcoders used in the remote BSC.What is the use of giving 4 E1 links b/w BSC and transcoder to carry just 16kbps of data and also tell me something regarding E1 links.21st June 2004 at 07:47 #38510alexGuest
u don’t need 4 E1 links between BSC and transcoder, u need only one here, u need 4 E1 links between transcoder nad MSC, in most cases transcoders are at the same site as MSC and connected by one E1 link to remote BSC to save transmission cost…
http://www.dx200.biz21st June 2004 at 17:22 #38511ParthaGuest
In general each Call fm MSC is carried in 64kbps.This bitrate is too high to be carried feasible over a Radio Link earlier.So it was decided used a suitable coding method like RPE-LPC(Regular Pulse excited – linear predictive coding) so that the same speech call is coded in 16kbps.(13kbps for speech + 3kbps for signalling).
Thats why the Transcoder converts a 4E1 link to 1E1 link.12th December 2011 at 07:42 #38512Saeed JANGuest
At NSN Network I Have seen most the gateways(Transcoder) are located separte from BSC and MSC at centre location why ?
As we know if we MSC and Transcoder located at single point we can reduce media cost.6th December 2015 at 10:28 #38513SamGuest
I have a Remote BSC and TC and MSC collocated. I want to know if there is any bandwidth saving on the interface between BSC and Transcoder, if we change from TDM to AoIP.
How do i get expected bandwidth from my current TDM BSC (on the interface between BSC and Transcoder / not MGW)?9th December 2015 at 15:19 #38514Wallis DudhnathGuest
The classic switch is based on 64kbits/s stream. The traditional MSC is based on the classic 64kbits/s stream for Voice connections.
TRAU is used to convert the rate to 64kbits/s. You have to see if your Network is configured for FR/HR/EFR.
Not sure is you have TFO in operation.
Let me know if you need any further inputs.
VBR/ Wallis Dudhnath