DM881 STM16 SDH Multiplexer

DM881 9U STM1/4/16 SDH MultiplexerThe DM881 is a SDH multiplexer and multiservice concentrator. It supports a switching matrix with a SDH capacity between 7.4G and 40G, and also includes a DSO cross-connect between 384 E1s and 1002 E1s. It operates with the following interfaces: E1, E3/T3, STM-1, STM-4, STM-16, Fast Ethernet and Gigabit Ethernet. It offers SDH-NG functionality and can concentrate up to 384 E1 ports per chassis.

DM881 Datasheet

Interface Cards

The DM881 is a new generation multiplexer with multiservice functionality, developed for transport, access and data switching applications. The modules of the matrix and control have a SDH cross-connect capacity between 7.4G and 40G, with a DSO cross-connect capacity between 384xE1 and 1008xE1.

Completely modular, it has 12 slots for electric or optic interfaces. Two service slots for V.11 interfaces, housekeeping, RS232 and service channel.


  • Chassis with 9U for a 19” rack
  • Caters to E1 applications up to STM-16
  • MSP, SNCP and MS-SPRing protection
  • Supports EPS protection for E1, E3/T3 and STM-1E interfaces
  • 2 slots for the cross-connect and management matrix, 12 slots for interface cards and 2 slots for service cards
  • Supports hot-swap in all modules
  • Power – 48/60VDC with redundancy


  • Operation with redundancy
  • Implements cross-connect at 64kbit/s timeslot level
  • Implements cross-connect at VC12, VC3 and VC4 level


  • Includes 12 slots for E1, E3/T3, Ethernet/Gigabit Ethernet and SDH interface cards
  • It has 2 slots for service cards with V.11, RS232, housekeeping and service channel interfaces.


  • Internal clock
  • 2048kHz external clock input via a connector in the MPU card
  • SDH or E1 interface regenerated clock.

 Power Supply

  • Supports inputs of -48 to -60VDC
  • All cards have a redundant power circuit


DM881 Application Exchange Node
Exchange Node
DM881 Application E1 over SDH
E1 over SDH
DM800 Application
DM800 Series