http://www.cisco.com/en/US/prod/collateral/routers/ps259/product_data_sheet09186a00801aca3e.html

or
CCO Login Required:

http://www.cisco.com/en/US/partner/p...08017adcb.html

I'll extract relevant bit for you below:
Cisco 2811

Network-module slot - 1 slot, supports NM and NME type modules.

-----------------------

Cisco 2821

Network-module slot - 1 slot, supports NM, NME and NME-X type modules

-----------------------

Ethernet Switching Network Modules

NME-16ES-1G
EtherSwitch Service Mod 16 10/100T + 1 GE,IP Base

NME-16ES-1G-P
EtherSwitch Service Mod 16 10/100T POE + 1 GE,IP Base

NME-X-23ES-1G
EtherSwitch Service Mod 23 10/100T + 1 GE POE, IP Base

NME-X-23ES-1G-P
EtherSwitch Service Mod 23 10/100T POE + 1 GE POE, IP Base

NM-16ESW
16-port 10/100 Cisco EtherSwitchÆ Network Module

NM-16ESW-1GIG
16-port 10/100 Cisco EtherSwitch Network Module with 1 Gigabit Ethernet
(1000BASE-T) port

NM-16ESW-PWR
16-port 10/100 Cisco EtherSwitch Network Module with in-line power
support

NM-16ESW-PWR-1GIG
16-port 10/100 Cisco EtherSwitch Network Module with in-line power and
Gigabit Ethernet

NMD-36ESW
36-port 10/100 Cisco EtherSwitch High-Density Services Module (HDSM)

NMD-36ESW-2GIG
36-port 10/100 Cisco EtherSwitch HDSM with 1 Gigabit Ethernet
(1000BASE-T) port

NMD-36ESW-PWR
36-port 10/100 Cisco EtherSwitch HDSM with in-line power support

NMD-36ESW-PWR-2G
36-port 10/100 Cisco EtherSwitch HDSM with in-line power and Gigabit
Ethernet

NME-XD-24ES-1S-P
24 10/100 w/ POE + 1 SFP + Stackwise interfaces

NME-XD-48ES-2S-P
48 10/100 w/ POE + 2 SFP


you are pretty much stuck at FE with maybe 1Gig for up-linkingdepending on the module you pick......


jgitau

On Jul 29, 2010 5:09pm, Odhiambo Washington <odhiambo@gmail.com> wrote:
>
>
> On Thu, Jul 29, 2010 at 4:59 PM, Philip Musyoki pmusyoki@gmail.com> wrote:
>
>
> For Cisco experts,
>
> I have a Cisco 2811 Router that I want to install with a 16 port switch card, and I am want to know if we have a Gigabit switch or the available ones are Fast Ethernet.
>
>
>
>
>
> DISCLAIMER: I am not a guru.
>
>
> 'sh int summary' - will enable you to see that information. 
>
>
> --
> Best regards,
> Odhiambo WASHINGTON,
> Nairobi,KE
>
>
> +254733744121/+254722743223
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> "If you have nothing good to say about someone, just shut up!."
>                -- Lucky Dube
>