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Ratio between Abis and A links

Viewing 8 posts - 1 through 8 (of 8 total)
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  • #53543 Reply
    Nagra
    Guest

    Hi,

    What is the typical ration between Abis and A links at a MSC?

    Thanks.

    #53544 Reply
    DuplexcomCEO
    Guest

    Hi Nagra,
    The approximate relation is 4:1. It means, if there are 64 Abis links in a BSC then it is recommended to have atleast 16 A links b/w BSC& MSC. This is due to the mux feature in Abis in which 4 subscribers share a single path. But in BSC/TRC with MSC, the A link allows each subscriber with a slot. Hope this clears. Thanks

    #53545 Reply
    ali abbas
    Guest

    Can we improve interface by some means.

    #53546 Reply
    pix
    Guest

    you cannot improve an interface. i mean, there’s no need for improvement if it’s working… you have problem with microwave links perhaps ?

    #53547 Reply
    DuplexcomCEO
    Guest

    Hi Ali,
    In what means you need to improve the interface. I cant get ur point.

    xpotentialram@gmail.com

    #53548 Reply
    Nagra
    Guest

    Hi DuplexcomCEO,

    Thx for your answer.

    What’s not clear is: if 4 subscribers share a E1 timeslot on Abis and a full E1 timeslot is required per subscriber on A, then to support all potential subscribers on Abis one would need 4 times as many trunks on A than A bis: 64 on Abis => 256 on A.

    #53549 Reply
    Nagra
    Guest

    ali abbas are you talking about interface or interference?

    #53550 Reply
    DuplexcomCEO
    Guest

    Hi Nagra,
    There is 4:1 mapping on Abis/Ater interface. In most cases, the BSC/TRC is co-located with the MSC in the same place for less expensive physical link between them. The below link has a document that would be very useful for you.

    http://www.kate-kom.com/Documents/Solutions/GSM_UMTS_backhaul_WP_v01.00.pdf

    xpotentialram@gmail.com
    Thanks

Viewing 8 posts - 1 through 8 (of 8 total)
Reply To: Ratio between Abis and A links
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