Norstar 3x8 model numbers?

[Tom4671]

I am looking to buy a system on Ebay. I am not a real expert on Norstar. I have a model number and I have seen other model numbers but I am not sure why there are so many different ones. The one I am interested in is
REL 01D
NT5B05DB
0401249515
961000
A07
Is this the best one? (above)
or the one below?

REL 01C
NT5B05CB
0401199444
960500
A03

I have even seen model number like this
NT5B05DL-93
NT5B05DS

So what does it mean to have different letters at the end of the model number? Which is the best? Is there a site where I can go to find out what exsctly all these differences are? I REALLY appreciate your time.....
THX a TON. If you can help.
Tom

 

[jeter]

You may want to check out the nortel web site.

http://www.nortelnetworks.com

“Reserve your right to think, for even to think wrongly is better than not to think at all”

Fisher CCNA

 

[Guest_imported]

Heh... yeah right like there's any good information on nortel's site thats not protected by a dealer password!