If a T1 circuit is used to provide voice channels for a small call center, how many simultaneous phone calls can it provide?

If a T1 circuit is used to provide voice channels for a small call center, how many simultaneous phone calls can it provide?

6 Answers

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  • GTB
    Lv 7
    3 weeks ago

    24 lines for a single T1 circuit

  • 3 weeks ago

    Does anyone use multiplexed circuits any more? It's all IP based these days.

    • Nuff Sed
      Lv 7
      3 weeks agoReport

      I was talking to some Verizon linemen last week who were busy installing a T1 circuit to a person's residence in town.

  • 3 weeks ago

    Depends if the T1 circuit is channelized or not.  A T1 circuit can be configured to be a single 1.5Mbps circuit and used to carry "IP", in that case Daniel G is correct.  If the T1 circuit is channelized as 24 x 64Kbps, then it can carry 23, one call per channel with one channel reserved for signaling, so VP is correct.

    Pulse Code Modulation uses 64Kbps for a single call.

    H.323 and other "IP" encoding methods use 4Kbps or less.

  • 3 weeks ago

    For voice, about 385 simultaneous channels. 256 the norm.

    Bandwidth is 1.54 Mbps. 4Kbps per voice channel is all that is needed.

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  • VP
    Lv 7
    3 weeks ago

    I asked Google this, "How many simultaneous phone calls can a T1 provide?"

    It said, "23 simultaneous channels. Each channel has a capacity of 64 Kbps. 23 of these channels can support 23 simultaneous voice calls."  

    I'm adding this: The 24th channel is reserved for signaling information such as caller ID. 

  • BigE
    Lv 7
    3 weeks ago

    How many digital channels can a T1 provide?  See how a T1 is channelized, that is the answer.

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