Ericsson RBS 2106 Hardware Reference Manual page 339

Electrically, the DXU-21 consists of the following main blocks:
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4.1 CPU System
The heart of the DXU-21 is a 32-bit embedded controller with a PPC 405
processor core with interfaces to a wide range of peripherals.
The CPU system consists of:
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4.2 Communication Switch System
This system block contains circuits that handle traffic between the BSC and
the dTRUs.
4.3 Transmission Interface Controller
This part contains circuits for four transmission links and the transmission
interface controller, which controls the traffic for all four transmission links.
The bit rate is SW controlled. Two speeds are available: E1 (2.048 Mbit/s) or
T1 (1.544 Mbit/s).
CPU system
Communication switch system
Transmission interface controller
Power supply
Timing system
Miscellaneous logic
Compact Flash Card
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I C controller
Ethernet 10/100 Mbit/s (full-duplex) controller, MAC
SDRAM memory
FLASH memory
ASIC GARP
Compact Flash Card
5(10)
EN/LZT 720 0244 R1A