Just to add if you are planning to use all 8 PRI and will be using this router for WAN connectivity - based on your needs I would recommend go for a powerful router i.e 2921 or 2951 keeping in mind throughput requirements and any future possible expansion etc.
Here is the link which compares the features etc.: http://www.cisco.com/c/en/us/products/routers/2900-series-integrated-services-routers-isr/series-comparison.html
You can also go through data sheets as well if you need to find any more info.
Thanks Terry! Just to add that a few years ago Cisco had a serious problem with 2-Port VWIC-MFT card where if customer would connect two WAN connections on the same card, the clock source wouldn't be synchronized with ports reporting lots of errors causing issues.
I am kind of coming back to Cisco Technologies after a while so don't know if it will be ideal to connect all 4 PRIs or 2 PRIs on 2901 on the same card if the issue is still there.
Hi Mate - Generally speaking they work good. I have lot of deployments where ISDN PRI for Voice is working fine where all the ports on a card are populated.
Again it depends on what goal you are trying to accomplish, what is your budget, capacity planning, redundancy\HA needs or your WAN throughput needs etc. that can determine which specific series you select. But to answer your question any of 2900 series will do 8 PRIs and should work without any issues if you populate all the ports on a card - that's what they are meant to do.
But having said that one more thing you will need to consider is the DSP resources required. As you might have seen from the comparison sheets 2901 and 2911 have only two PVDM slots - so you can have 2* PVDM3-256. Each card will do 256 channels for high complexity codec and 120 for low. So plan according to your needs and choose the router which suits your needs.
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