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Channelised ISDN E1/PRI and serial interfaces number

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  • Channelised ISDN E1/PRI and serial interfaces number

    Hi.
    I need some help regarding interpreting a show ver output of a 3620 router.
    This is what I have:

    cisco 3620 (R4700) processor (revision 0x81) with 24576K/8192K bytes of memory.

    1 FastEthernet/IEEE 802.3 interface(s)
    32 Serial network interface(s)
    1 Channelized E1/PRI port(s)

    How many interfaces and what kind of interfaces does this router have?
    I'm confused about the number of Serial interfaces. Does the Channelized E1/PRI port create virtual serial interfaces (i think yes) and if yes than how many?

    From what i can see from the configuration the router has:
    1 FastEthernet interface
    1 Channelized E1/PRI interface
    1 Real Serial Interface

    Thank you in addvance.

  • #2
    Re: Channelised ISDN E1/PRI and serial interfaces number

    As we use T1's in my country, not E1s, I had to refresh my memory on how many circuits are in an E1.

    From the Internet-
    The E1 signal format carries data at a rate of 2.048 million bits per second and can carry 32 channels of 64 Kbps* each.

    In this case, it look like, to me at least, you have 31 E1 PRI 64k circuits (B channels and 1 of the 32 was reserved for signaling, the D channel)

    Then, you have your 1 serial interface, totalling 32.

    So, yes these are virtual interfaces on your single E1 PRI.

    Hope that helps...
    David Davis - Petri Forums Moderator & Video Training Author
    Train Signal - The Global Leader in IT Video Training
    TrainSignalTraining.com - Free IT Training Products
    Personal Websites: HappyRouter.com & VMwareVideos.com

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    • #3
      Re: Channelised ISDN E1/PRI and serial interfaces number

      Thank you!

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