I'll add something additional regarding using the Trunked search with the system ID. In some cases a DMR T3 system will be listed with its Network Model:
T=tiny
S=small
L=large
H=huge
What I'm saying here doesn't apply to MCA, since MCA is a Connect Plus system.
For DMR T3 sites, the database allows admins to add the Network Model to the Network ID (aka System ID) so that it could be added as S1 (combined Network Model Small and Network ID 1) such as this system:
Lauttamus (T3) Trunking System Profile
www.radioreference.com
If you were to then go to the downloads page on the above system and download the DSDPlus stuff, it would include the S model information in it.
But not all admins have added the Network Model to all of the T3 systems in the DB, sometimes because they might not know any better, and sometimes because nobody has submitted the Network Model.
I guess my point is just to say that depending on what you are looking for, JUST typing in the Decimal system ID might not reveal anything for you. If it's a DMR T3 system or a NEXEDGE system, it has a network model and might be listed in the DB with or without the network model prefix when you do a Decimal System ID Search.