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Transcoders in remote BSC

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #38509 Reply

    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.

    #38510 Reply

    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…


    #38511 Reply

    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.

    #38512 Reply
    Saeed JAN

    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.

    #38513 Reply

    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)?

    #38514 Reply
    Wallis Dudhnath

    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

Viewing 6 posts - 1 through 6 (of 6 total)
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