UTD-EM-M8 device is an Ethernet inverse multiplexer with 8 x E1 (G.703 2048kbit/s) interfaces. It allows connection of Ethernet network using one to eight 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 8 E1 channels, it is possible to obtain the maximum throughput of 16.384 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.


Inverse Multiplexer / Concentrator
​10/100Mbit/s Ethernet / 8x E1 2.048Mbit/s
UTD-EM-M8 10/100/1000 Mbit/s
8x E1


Special features:
  • Point-to-point working mode: Connection of two GigabitEthernet LANs over up to eight E1 lines (16,384 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
  • ​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


  • 8x E1 channels
  • 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%

Line interface 2048kbit/s

  • G.703 compliance
  • ​2048 kbit/s ± 50 ppm binary throughput
  • 120 Ohm E1 impedance
  • Line code HDB-3
  • ​4x RJ45 connector