Can an SRX1800 be configured to act as a LAC (L2TP Access Concentrator)?
I'm not sure which platform you are refering to. SRX1800 doesn't exist.
Regarding LAC it's only supported on the MX series routers:
Expect that this list only shows MX240 and above it should also work on MX80, MX104 and vMX (+ the needed licenses).
I'm not sure where I got that from either..... Maybe a typo.... Should have read 1500... Apologies.... Thanks for the help....