This is the teardown of a Ericsson Aastra MX-ONE telephone exchange. A telephone exchange is responsible for managing incoming and outgoing calls.
Case
The case is a 19 inch rack mount case. The top and bottom are made out of a mesh to let air flow through it.
Backplane
The case has a backplane for connecting the modules that slide into it to each other. Not every position on the backplane has the same amount and types of connectors. This means that some modules will only fit and work in a specific spot in the case.
Modules
Unfortunately I do not have much information about the modules shown here. However, they are still worth looking at as they are really well engineered.
DC-DC module
DC to DC unit.
AAU2 module
Access Agent Unit.
ALU2 module
Alarm Interface Unit.
DSU module
Distributed Switch Unit.
ELU33 module
32 Port Digital Extension card.
ELU34 module
32 Port Analog Extension card.
ESU module
Embedded Server Unit.
IPLU module
IP extension unit.
LPU5 module
LIM Processor Unit.
LSU module
LIM Switch Unit.
NIU2 module
Network Interface Unit.
TLU76 module
Trunk Line Unit.
TMU module
Tone Message Unit.
