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  1. Senior Member sacredboy's Avatar
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    #26
    Quote Originally Posted by DexterPark View Post
    That's entirely up to you, but I would definitely go PVDM2-32.
    Could you please explain why. Just in brief. And what about VWIC2-1MFT-T1/E1 vs VWIC2-2MFT-T1/E1?
    Best, sacredboy!
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    #27
    The bigger the PVDM2 (8,16,32,48,64), the more resource it can allocate to supporting voice services and the higher the resource density in the router.

    A PVDM2-16 can support up to 16 traditional voice channels: 4 x FXS ports, 4 x FXO ports , 8 x E1/T1 channels.
    A PVDM2-32 can support up to 16 traditional voice channels: 4 x FXS ports, 4 x FXO ports , 24 x E1/T1 channels. etc

    They also perform transcoding between codecs, and mixing of audio streams in conference calls, which also consume the PVDM2 resources (DSP chips).

    In a normal home lab you can usually get away with the HQ router having a PVDM2-32/64 and branch offices with PVDM2-8.

    As for the VWIC2-1MFT-T1/E1 vs VWIC2-2MFT-T1/E1. The 1MFT supports 1 x E1/T1 circuit while the 2MFT supports 2 (ether E1 or T1).

    In the end, what gets bought for the lab comes to what you are prepared to spend or can afford.
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  4. Senior Member DexterPark's Avatar
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    #28
    Quote Originally Posted by sacredboy View Post
    Could you please explain why. Just in brief. And what about VWIC2-1MFT-T1/E1 vs VWIC2-2MFT-T1/E1?
    Pretty much what Azaghul said, (Although I doubt I'd have been as articulate...) You really can't create a PRI without at least a PVDM2-32 chip. It will bark at you if you try. A PRI has 23 B-channels that your voice traffic traverses and a single D-channel that keeps sync and does all the signaling.

    As for which card to choose I will again say that depends on you What do you want to accomplish with them and how do you want your branch routers to connect to the WAN & PSTN?

    Will you have a PRI at each site? If that's the case you will need at least a single port PRI card, and you will also have a T1 at each site as well for WAN connectivity.

    Why not save slots by getting a VWIC2-2MFT-T1/E1 and use one port for a T1 and another for a PRI?

    Maybe you finally decide to go SIP and have your HQ router/CUCM server be the central PSTN gateway accessible to the remote sites via the WAN.

    In that case, you could take your two port PRI card and have two bonded T1's in a multilink interface which provides a 3 Mbp/s link to your HQ.

    It's all about the design my friend.
    Last edited by DexterPark; 05-21-2013 at 02:30 AM.
    My advice to anyone looking to advance their career would be to learn DevOps tools and methodologies. Learn how to write code in languages like Python and JavaScript. Not to be a programmer, but a network automation specialist who can do the job of 10 engineers in 1/3 of the time. Create a GitHub account, download PyCharm, play with Ansible, Chef, or Puppet. Automation isn't the future, it's here today and the landscape is changing dramatically.
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  5. Senior Member sacredboy's Avatar
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    #29
    Guys I appreciate your detailed explanation.

    I am going to obtain VIC2-2FXS and VIC2-2FXO. Just a couple of questions:
    1. How many of each type of card I will need (currently I have 2 routers)?
    2. What would you say about obtaining VIC2-4FXS instead of VIC2-2FXS and VIC2-4FXO instead of VIC2-2FXO?
    Best, sacredboy!
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    #30
    The difference between a VWIC2-2FXS and VWIC2-4FXS is that the first has 2 FXS ports and the other has 4 FXS ports. Same for the FXO cards. Either would be sufficient for a lab. Get whichever you can find cheapest.

    You will need 1 FXO card per router and probably just one FXS card so you can learn how to configure it.
    Last edited by swild; 05-25-2013 at 11:14 PM.
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  7. Senior Member sacredboy's Avatar
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    #31
    Quote Originally Posted by swild View Post
    The difference between a VIC2-2FXS and VIC2-4FXS is that the first has 2 FXS ports and the other has 4 FXS ports. Same for the FXO cards. Either would be sufficient for a lab. Get whichever you can find cheapest.

    You will need 1 FXO card per router and probably just one FXS card so you can learn how to configure it.
    So 2 x VIC2-2FXO and 1 x VIC2-FXS would be ok. Right?
    Best, sacredboy!
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    #32
    That's what I would go with.
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  9. Senior Member sacredboy's Avatar
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    #33
    Guys could you please clarify which version of FXS card is compatible with 2801 or 2811 routers.
    According to Cisco table of "Software and Memory Requirements for Voice/Fax Network Modules and Voice Interface Cards"
    Cisco IP Communications Voice/Fax Network Module* [Cisco IP Communications Voice/Fax Network Modules] - Cisco Systems
    VIC3-2FXS is required 2800 series.
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    #34
    The VIC2 series works with the 2800 series, but also the older VIC-4FXO and VIC-4FXS/DID 1st generation cards. Unknown if the VIC-2xxx cards work/recognised.
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  11. Senior Member DexterPark's Avatar
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    #35
    Quote Originally Posted by sacredboy View Post
    VIC3-2FXS is required 2800 series.

    I don't think that's the case. I have a VIC2-4FXO card plugged directly into an HWIC slot on one of my 2800 series routers and it works fine, no need for modules. That's why there are called ISR's right?
    My advice to anyone looking to advance their career would be to learn DevOps tools and methodologies. Learn how to write code in languages like Python and JavaScript. Not to be a programmer, but a network automation specialist who can do the job of 10 engineers in 1/3 of the time. Create a GitHub account, download PyCharm, play with Ansible, Chef, or Puppet. Automation isn't the future, it's here today and the landscape is changing dramatically.
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