The DM820 platform is fully flexible, providing 2 slots for compact Main Processing Units (MPU), 2 slots for interface cards compatible with the DM800 series, 2 slots for power supply, 2 slots for specific interface cards and 2 slots for ventilation modules. All cards can operate in redundancy, increasing reliability and network availability.

• Shelf of 2U high, compatible with standard 19" racks
• Attend since E1 to STM-16 applications
• Support to Ethernet NG-SDH interface modules
• MSP, SNCP, MS-SPRing and DNI protection
• MPU redundancy
• Integrated fan module
• Hot-swap on all modules
• -48/60VDC Power supply redundancy
• Up to 504xE1 DS0 cross connection

MPU

• Cross-connect in VC-12, VC-3 and VC-4
• Permits cross connection of 64bit/s timeslots with a capacity of 504 E1s

Slots

• Includes 2 slots for E1, E3/T3, Ethernet and SDH interface modules
• Includes 2 slots for reduced interface modules with E1 and housekeeping

Sync

• Internal clock;
• 2048kHz external clock input via a connector in the DM820-ICRHK module;
• SDH and E1 interface regenerated clock.

Power Supply

• Supports inputs from -48 up to -60VDC or 100 up to 240VAC
• All modules include a redundant power circuit

Fan Control

• Rotation monitoring
• Supports 2 redundant fan modules
• Speed control based on equipment temperature