2-Line Expandable Digital Receiver -Supports up to 15 line card modules -256 event buffer per line -Listed for UL and ULC central station -19” rack mount -Includes: SG-CPM2 central processing module SG-DRL2E digital line card module SG-MLRFE receiver cage -Supports: SG-DRL2E digital line card module SG-DRL2A digital line card module SG-DRL-IP network line card module SG-DVL2A DVACS line card module