DM4E1 Optical PDH Multiplexer

DM4E1 Optical PDH MultiplexerThe DM4E1 is a PDH multiplexer in conformity with G.751 and G.742 standards. It multiplexes E1 channels, Ethernet, V.11 and E3 in optical or electrical 34M beams.

DM4E1 Datasheet

  • Physically comprised of a basic unit for 19” 1,5U-high rack assembly.
  • Optical aggregates for multimode or single mode fibre, with one or two fibres. G.703-compliant electrical aggregates. The DM4E1 E3 cards are compatible with the DM16E1, allowing you to have fewer different cards in stock.
  • Aggregates with bidirectional fibre, which optimizes the use of the installed fibres.
  • Quick configuration menu for key SNMP management parameters in just one screen.
  • Optional aggregate link backup, allowing hot swap. Features two aggregate slots, which allows it to be used with or without redundancy, depending on the application.
  • Automatic laser turnoff when the aggregate is in LOS, increasing safety for the installation and maintenance of optical links.
  • Redundant power supply with a secondary power supply unit (FAL). Supports hot swap. The FAL model is the same for both AC and DC power supply.
  • Generation of alarms selectable per ports. Features three external alarm inputs and an alarm output with NA/NF contact.
  • 4 E1 G.703 (DM4E1 Series II) tributaries in 75ohms (IEC169/13 or BNC) and 120ohms (RJ45).
  • 1 V.11 interface that can operate at Nx64kbit/s rates.
  • Test loops activated locally or remotely. BERT for the V.11 interface.
  • Indication LEDs for the aggregate status, E1 tributary status. Power supply, Ethernet link, service channel, equipment test or alarm.


  • Mixed-ring operations with DM4E1 Series II and DM16E1, sharing the same E3 link, reducing costs in the centralized and distributed system implementation.
  • Flexible tributary mapping allowing configuring tributaries in any E3 aggregate position.
  • Optional VLAN-compatible Ethernet Remote Bridge 10/100BaseT interface, which allows the equipment to be used as end-to-end Inverse Multiplexer, for ring operation or E1 (G.703) interface outputs.
  • Optional internal electric E3 interface, which allows the redundant transmission of an electric E3 link in optical aggregates (optical modem) or the input of a ring electric E3 comprised of the DM4E1 or DM16E1  equipment.
  • Internal router with two WAN interfaces (WAN1:DMLAN, WAN2:PPP/Frame Relay) and one Ethernet (10BaseT) allowing SNMP management or remote software upgrade, in addition to IP address to equipment from other manufacturers.
  • Configurable operation topology, which allows the use as end-to-end, ring, line, optical modem or interface regenerator/converter.
  • Service channel through a regular telephone (optional).
  • SNMP or VT100 terminal remote management, allowing for the configuration, status verification and test activation.


DM4E1 Application Ring Topology Over Fibre Or Microwave
Ring Topology Over Fibre Or Microwave
DM4E1 Application Fibre Drop Extensions
Fibre Drop Extensions
DM4E1 Application Fibre Drop Extensions
High Speed LAN to LAN Connectivity Over N x E1 Lines