UTD-EM-M16 device is an Ethernet inverse multiplexer with 16 x E1 (G.703 2048kbit/s) interfaces. It allows connection of Ethernet network using one to sixteen E1 channels aggregating their band. Joining of E1 streams into a common transmission channel is based on inverse multiplexation with in-built mechanisms adapting differences in times of transferring packages in separate lines. By using 16 E1 channels, it is possible to obtain the maximum throughput of 32.768 Mbit/s for Ethernet packages. The malfunction of a single E1 channel, regardless of a direction, causes its automatic switch off and no loss of packages. In case the line is back in operation, such a condition is automatically detected by the device and the transmission in the channel is restored.


UTD-EM-M16​ can be also used to collect traffic from different LANs connected by nxE1 lines (n from 1 to 16). This is an efficient and economic solution to distribute Internet access over TDM network. UTD-EM-M16 working as a concentrator can distribute traffic according to VLAN IDs.

UTD-EM-M16 can be used as concentrator with FIBRAIN (UTD-EM-AE1, UTD-EM-M4, UTD-EM-M8, UTD-EM-T) and other vendor's devices (Eth./1xE1) .

GigabitEthernet over 16xE1 Inverse Multiplexer /
​Concentrator. Ethernet, WWW, Telnet, SNMP, management
UTD-EM-M16 10/100/1000
16x E1


Special features:
  • Point-to-point working mode: Connection of two GigabitEthernet LANs over up to sixteen E1 lines (32,768 Mbit/s)
  • Point-to-multipoint working mode: As concentrator, collect traffic from different LANs connected by E1 lines
  • Built-in 6-port Gigabit Ethernet switch (4 electrical ports and 2 SFP)
  • IEEE 802.1q, 802.1QinQ, 802.1p (QoS) support
  • Automatic E1 channel failure detection
  • Management: WWW, TELNET, SNMP
  • Optional power supply redundancy
Technical specification:


Ethernet Ports

  • 10/100/1000Mbit/s transmission speed (1000Mbit/s for SFP ports)
  • Flow control function
  • Autocrossover function "MDI, MDI-X
  • ​QoS, VLAN (IEEE 802.1q, 802.1ad) support
  • 4 x RJ45 connector, 2xSFP module

Power supply

  • Supply voltage range 36 to 60V DC
  • ​External power supply included, 230VAC/48VDC
  • Up to 12W power consumption
  • ​Optional power supply redundancy


  • ​SNMP
  • ​HTTP protocol and web browser as management application
  • ​SMTP - send e-mail message is case of failure
  • ​Out of band, by dedicated Ethernet port


  • Number of E1 channels - 8
  • ​Maximum delay difference between E1 channels of up to 50 ms
  • Minimum loss of band in E1 channels for Ethernet frames of 1500 bytes < 1%

E1 line interfaces

  • G.703 compliance
  • ​2048 kbit/s ± 50 ppm binary throughput
  • 120 Ohm E1 impedance
  • Line code HDB-3
  • ​Types of connectors: 8x RJ45


  • 483x170x44mm housing, 19'
  • Weight < 1.7kg
  • ​Suitable for mounting in rack shelf ( 19' housing)