SpectraLink 150 M3 MCU - Manual (Page 23)

SpectraLink Corporation Link WTS Installation and Operation
Part Number: 72-0075-01-C-W.doc Page 12
Four Wire Digital Interface
The wiring diagram below shows the connections required for a four-wire interface .
Each MCU of this type requires two demarcation blocks which will be wired as
indicated.
Four Wire Digital Connection