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

jeremusjeremus Posts: 8Registered Members ■□□□□□□□□□
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?

Comments

  • kyrunnerkyrunner Posts: 1Registered Users ■□□□□□□□□□
    FXS= Foreign Exchange Station. Mainly used for FAX Machines, Analog phones. A FXS card is used to convert analog to digital.
    FXO= [FONT=arial, sans-serif]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 [/FONT]
  • jeremusjeremus Posts: 8Registered Members ■□□□□□□□□□
    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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