Some Definitions
WB900 - an analogue radio frequency based system that did not support even low speed data communications. Installed from the early 1980s. Now obsolete and rarely encountered.
DACS1 - first generation digital system that did not support CLI but supported low-speed data communication devices such as fax machines. Installed from around 1990. DACS1 is no longer used in new installations.
DACS2 - released in the mid 1990s, DACS2 was an upgrade to DACS1 with support for CLI and higher data speeds (but see below). DACS2 is fundamentally similar to DACS1 in operation.
DACS - DACS1 and DACS2 are commonly known simply as 'DACS'. Most DACS installations in the UK are now DACS2.
Read more about this topic: Digital Access Carrier System
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