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  1. Junior Member
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    Jul 2016
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    #1

    Default FXS, DID or FXS/DID, FXO, PRI-T1

    Can anyone, pls. explain to me what is actually the relationship based on the functionality of FXS, DID or FXS/DID, FXO, PRI-T1 ?
    Are the DID Trunks similar to the trunks of PRI-T1, say 24 channles ? Are these 23 b-channels and 1 d-channel for a PRI-T1 are the same as trunks of the DID service?
    Dou you still need a DID service offered by telephone companies that enables callers to dial directly an extension on a PBX or packet voice system if you have already a PRI-T1 service?
    Do they have the same function between DID Trunks and Voice Channels of PRI T1?
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  3. Junior Member Registered Member
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    Jul 2016
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    CCNA Collaboration
    #2
    FXS= Foreign Exchange Station. Mainly used for FAX Machines, Analog phones. A FXS card is used to convert analog to digital.
    FXO=
    Foreign Exchange Office. Mainly used for connecting back to the Exchange Office. FXO cards are used for copper lines Example 911
    I also use FXO cards to connect into a over head paging system.
    PRI=24 channels 1 channel is the D channel and its reserved for the signaling
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  4. Junior Member
    Join Date
    Jul 2016
    Posts
    9
    #3
    Are the DID Trunks similar to the trunks of PRI-T1, say 24 channles ? Are these 23 b-channels and 1 d-channel for a PRI-T1 are the same as trunks of the DID service?
    Dou you still need a DID service offered by telephone companies that enables callers to dial directly an extension on a PBX or packet voice system if you have already a PRI-T1 service?
    Do they have the same function between DID Trunks and Voice Channels of PRI T1?
    Reply With Quote Quote  

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