1921 with only 15Mbps bandwidth?

[fortissimo2015]

I need a router 1921/K9 and checked its datasheet,

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6789/ps7290/ps10589/data_sheet_c78-598389.html

noticed words:

The Cisco 1900 Series enables deployment in high-speed WAN environments with concurrent services enabled up to 15 Mbps.

It's a damn low number that I can't believe my eyes. Is it real?

[daniel.dib]

That is a recommendation for when you should select the 1921. It's not the maximum speed it can handle. Check this document:

http://anticisco.ru/pubs/ISR_G2_Perfomance.pdf

In that test the 1921 performed 68 Mbps with NAT and QoS. Without advanced features it can perform more but with even more features it could perform less. That's why it's a recommendation to use it for 15 Mbps circuits. So you always have to look at these numbers and your deployment scenario and then choose a properly sized router.

Daniel Dib
CCIE #37149

[Joseph W. Doherty]

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Posting

15 Mbps (duplex) is (or very much was) considered high speed for WANs.  Remember WAN links were high speed when they exceed a T1's or E1's bandwidth. Also note, DSL or cable modems doesn't often exceed 10 Mbps.  (Note - today, cable modems might offer 20 to 100 Mbps.)

Cisco's performance recommendations are very conservative, they try to insure you won't overtax the CPU regardless of your configuration assuming the bandwidth consumption is continuous at the maximum recommended bandwidth.