Ericsson CMS 881 RTS Rack
This is the Ericsson RBS881 for TACS, 1 channel per rack
CMS 8800 (AMPS) CMS 8810 ( TACS)
The next generation was for ETACS was RBS883
This rack would be installed in a Vodafone Base station,and is at the heart of communications with the TACS mobile phone.
The Rack can be broken down into 3 main sections.
1)Far right - The Power supply plug in unit (RCP)
This converts 24v DC into 5v,12v,-12v and -24v for the analog, digital and RF circuitry
2)Right of Centre - The Control Unit (Cu)
This is a mini rack that sits in the main rack, and contains 6 PCBs and its own back plane
3) The RF,IF and AF Plug in Units