UTD-EM-ARS is multiplexer of eight RS232/485 serial interfaces and 10/100Mbit/s Ethernet into E1 G.703/G.704 transmission channel. Usage of UTD-EM-ARS multiplexers is an efficient, cost effective method to provide Ethernet and RS232/485 Serial connections over existing PDH/SDH network. One of the possible applications is energy sector, where UTD-EM-ARS can be used to provide communication links for telecontrol and telemetric data transmission from the devices equipped with RS232/485 serial interfaces.

​Embedded HTTP server, TELNET server and SNMP agent allows free configuration of the device performance by standard Web browser and continuous monitoring from any management platforms equipped with SNMP client. In addition, built-in SMTP service daemon allows to notify the operator in case of system failure.

8xRS232 (2x RS485) + Ethernet 10/100 Mbit/s
over E1 multiplexer
UTD-EM-ARS 8x RS232 (2x RS485)
+ 10/100 Mbit/s


Special features:
  • Connects RS232/485 serial interfaces plus Ethernet LANs over single E1 line
  • Built-in 4-port Ethernet switch with an array of 1000 MAC addresses
  • IEEE 802.1q support. Possibility of defining up to 15 VLAN networks (full range VID) in order to create independent transmission channels
  • Maintenance and Management: WWW, TELNET, SNMP, SNTP
Technical specification:


Ethernet Ports

  • Baud rate 100/10 Mbit/s
  • Flow control function
  • ​Connection state signalling
  • 4 x RJ45 connector

Power supply

  • Supply voltage range 12 to 60V DC
  • External power supply included, 230VAC/48VDC
  • Up to 6W power consumption

RS serial interfaces

  • ​Number of RS232 interfaces 8 (6)
  • Number of RS485 interfaces - 2
  • RJ45 connectors


  • Housing: 483x170x44mm, 19'

Line interface 2048kbit/s

  • Framed and unframed G.703 and G.704 compliance
  • ​2048kbit/s ± 50 ppm binary throughput
  • 120 Ohm E1 impedance 
  • ​Line code HDB-3
  • ​RJ45 connectors