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|   E3, 2/34 Mbps PDH Multiplexer   |

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The E3-2/34Mbps, PDH Multiplexer is a third order skip multiplexer / demultiplexer unit, based on PDH (Plesiochronous Digital Hierarchy) technology. It multiplexes sixteen 2.048Mbps (hereafter referred to as 2Mbps) E1 tributaries into a single 34.368Mbps (hereafter referred to as 34Mbps) E3 tributary. The multiplexer / demultiplexer also does the reverse processing i.e. demultiplexing a received 34Mbps stream into sixteen 2Mbps E1 tributaries.

2/34 Mbps Multiplexer system consists of two 2/34 Mbps terminals one each at the local and remote ends, connected through a 34Mbps stream, providing end to end services for sixteen, 2Mbps streams. Both local and remote terminals can be monitored and controlled by a Network Management System (NMS) connected to the local terminal.


  • Single - card implementation
  • Plug and Play Multiplexer
  • Modular 2Mbps transmission units
  • Standard CCITT (ITU-T) compliant interfaces
  • Capable of synchronizing on any of the 34368 kHz clock sources - internal, external or extracted
  • Remote and local terminal monitoring and control by Network Management System
  • Optional TCP/IP Remote Access for monitoring alarms and management.


  • Extensive alarms and status indication facility
  • Service bit monitoring and insertion
  • Operates on nominal -48V DC input
  • Distributed on-board power supply
  • Microprocessor controlled with powerful diagnostic facilities for both remote and local systems
  • Local and remote loopback facility for 34Mbps stream
  • Stored program controlled
  • Highly reliable and compact

External Interfaces

The E3 unit provides the following interfaces to the external world:

  • 16, primary rate, 2Mbps, 120 W balanced interface
  • 1, third order, 34Mbps, 75 W unbalanced interface
  • -48V input for 2/34 on-board power supply
  • RS232 interface for connection to Network Management System, used for configuration and monitoring of the 2/34 multiplexer.
  • 2 alarm extensions for visual and audible alarms.

 The front panel LEDs provide the following indications:

L1 - E3 LOS
L2-  E3 Sync / Alarm
L3-  E3 BER

RJ-45 "LAN Port"

L8- E1 LOS
L10- "LAN ON"
L11- Positive 5V present
L12- Negative 48V input present

SW1 "LAN ON / OFF" Toggle Switch              
SW2   LAN Reset Switch

Programming and Monitoring

2/34 Mbps Multiplexer offers programming via an RS232 port for control and monitoring of the terminals. Both local and remote multiplexer can be monitored and controlled using a PC loaded with the NMS software connected to the local terminal.

Programming Features

  • Setting loopbacks on 2Mbps or 34Mbps
  • Enabling or disabling 2Mbps channels
  • Initiating self tests
  • Alarm acknowledgment option.

Status Monitoring

  • Priority sequence of clock selection and current clock on which the system is working
  • Status of alarm
  • Presence or absence of loop-back on 34Mbps and 2Mbps streams
  • Enabled / disabled status of 2Mbps channels
  • Monitoring healthy / unhealthy state of microcontroller and 2Mbps line interface units.

Alarm Status Monitoring

  • Loss of incoming signal at all 2Mbps ports
  • Loss of incoming signal at 34Mbps port
  • Loss of frame alignment at 34Mbps
  • Remote Alarm at 34Mbps
  • AIS at 34Mbps
  • Excessive Error Rate at 34Mbps
  • Status of audible alarm.

In addition to the above monitoring facilities, 2/34Mbps Multiplexer is provided with LEDs on the front panel of the multiplexer, which indicate various fault conditions.

Monitoring E3 via LED Indications
  • Loss of signal at 2Mbps
  • Loss of signal at 34Mbps
  • Loss of frame alignment at 34Mbps
  • Remote Alarm at 34Mbps
  • AIS at 34Mbps
  • Excessive Error Rate at 34Mbps
  • +5V failure
  • -48V input failure
  • Processor unhealthy alarm
  • Prompt Maintenance alarm

Others Links:

  STM SDH Multiplexers
  E1 VoIP-GSM Gateways
  VoIP SS7 and C7 Solution
  Echo Cancellers and VQE Solutions
  GSM Gateways / GSM Channel Banks
  E1 and T1 over Ethernet (TDM over IP)
  Digital Access Cross Connect Switch (DACS)
  E1, T1, E3, DS3, Ethernet Converter (IP over TDM)

Technical specifications are subject to change without notice.
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