DM4E1S. Slim Card Optical Mux
Slim Card Optical Mux

The DM4E1S is an optical modem with solutions for end-to-end communications and capable of simultaneously connecting up to 4 independent aggregates. Also capable of connecting up to 6 tributaries of up to 2,048kbit/s, directing them to any of the available aggregate positions.

  • End-to-end operations with up to 4 independent aggregate channels, reducing costs in the implementation of centralized and distributed systems.
  • Flexible tributary mapping allowing configuring tributaries in any aggregate position
  • Telebrás Slim subrack standard or compatible desktop enclosure.
  • Up to 4 optical interfaces, 4 E1 tributaries, 2 V.11 (V.35 compatible) interfaces and 1 V.28 interface.
  • Aggregate link backup, which can be used as 1+1 redundancy with independent aggregates depending on the application (with 2 or 4 optical interfaces).
  • Single E1 aggregate, which allows the transmission of an electrical tributary link for the optical interfaces at 2.048kbit/s (DM705 compatible). Works both for E1 and V.11/V.35 tributaries.
  • Configurable operation topology, which allows the use of independent aggregates, channel redundancy (1+1) and Single E1 simultaneously.
  • Remote equipment management through the aggregate link (In-band management), without interfering in the data transmission.
  • Slim card compatible with subrack for modem and can be managed by a DMG20 management card, VT100 terminal or remote equipment, allowing for the configuration of status and activation of tests.
  • Aggregates with bidirectional fibre, which optimizes the use of the installed fibres.
  • Automatic laser turnoff when the aggregate is in LOS, increasing safety for the installation and maintenance of optical links.
  • Generation of alarms selectable per ports. Features two external alarm inputs and one alarm output in relay as an NA/NF option.
  • Test loops activated locally or remotely.
  • Aggregate error control, with failure rates, synchronicity loss and Loss of Optical Signal (LOS) control.
  • LED indicators for alarms, test and power supply tension.


  • Standard configuration: Configuration with outputs from the four E1s in the DB25 from a Telebrás standard sub-rack, being possible to utilize cables and cabinets already available in the market to access the E1s. Internal and external alarms available in the screw ruler.
  • 1V configuration: Configuration in which the DB25 provides a V.11/V.35 with its main signals. The ruler of the sub-rack provides E1 for the screws usually used in the Telebrás standard as well as for the backup screws. Two more E1 interfaces in the DB25 connector can be made available. Option for internal and external alarm in the screw ruler.
  • 2V configuration: Configuration in which the DB25 provides two V.11/V.35 with 10 communication cables and 3 shared for control of the two V.11/V.35. Only two E1s can be used in this configuration, both in the screw ruler of the sub-rack. Option for internal and external alarm in the screw ruler.
  • When using the V.28 interface, the pins CT105 and CT109 of the V.11/V.35 interfaces are used, and the interface is left without this control pins available. Only for 1V and 2V configurations.
  • Possibility of using external clock CT128 for data reception. Only for 1V configuration.
  • Wide range of options for clock configuration in the V.11/V.35 interfaces, such as invert TX clock, CT113 unlooped CT114, CT104 controlled, CT113 and regenerated.


Configuration with 4 independent aggregates


Optical modem configuration for 2.048Mbit/s


Aggregated configuration with 1+1 redundancy


Fixed Configuration