[asterisk-users] Digium Part#'s (Was: Difference between TE121 and TE122)

[Dave Fullerton]

Igor A. Goncharovsky wrote:
> Hello!
> 
> Guilherme Loch Waltrick Góes wrote:
>> What's the difference between the TE121 and TE122. I read the description on
>> Digium's site and it isn't clear to me.
>> Best regards,
>>   
> The only one difference is interface: one of them have PCI and other 
> have PCI-Express.
> 

Here's my rant for the day:

The one thing that's bugged me about Digium's model numbers is the 
difficulty in determining features just by looking at them. The one 
thing that is easy to tell is the maximum number of ports/channels the 
card will take. From there it gets harder. Analog is either TDM* or 
AEX*. PCI or PCI express can sort of be determined by whether it ends 
with a P except on the TE122?. Whether hardware echo cancellation is 
built-in, available or not present can sort of be determined for digital 
cards if it ends in 2 or 7 except on one port models. PCI card voltage? 
Again, sometimes you can use the last digit but not on one port models. 
If you want to know what a card's capabilities are you're better off 
just memorizing each part number. Maybe there's a scheme I'm just not 
capable of understanding here.

Rant off.

-Dave