8030-CRM-511. The Symax Class 8030 Type CRM-511 Multi-Media Network Interface Module (NIM) allows Symax programmable controllers to communicate via leased line and private carrier media. Transmission over leased line and private carrier media can produce higher noise levels resulting in timing delays and insufficient data integrity. The CRM-511 Multi-Media NIM addresses these transmission problems by providing configurable operating parameters to closely match your application\'s communication channel delay and data integrity. The CRM-511 is an interface between the Sy/Net Local Area Network and Symax Programmable Controllers, CRT Programmers, and other compatible Symax devices. The CRM-511 allows Symax programmable controllers to communicate in full duplex, point-to-point mode over microwave, radio, multiplexed (cross country leased line), multiplexed broadband, satellite, and combined media channels.