System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
General Functions
Page 2-2 Proprietary Information Aastra
demultiplexer synchronizes itself to the frame alignment signal and applies
the 64 kbit/s signals to the system data bus.
Controlled by the central control module on the Central Unit, the channel
modules now extract their 64 kbit/s signals from the system data bus.
The COFIs on the channel modules convert the digital signals again into
analog signals and transmit them to the subscribers.