Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Reply To: # of TRX a LAC can carry


just to add: i think the 250 cells / LAC is when you activate the multiple CCCH feature.

and it strongly depends on how much paging are sent in your network.

basically, you should check your PCH load so that it remains below the 60% load threshold.
(check counters MC92xx)