E3, 2/34Mbps Multiplexer

Valiant's E3, 2/34Mbps multiplexer is a third order skip multiplexer / demultiplexer unit, based on PDH (Plesiochronous Digital Hierarchy) technology. It multiplexes 16, 2.048Mbps E1 tributaries into a single 34.368Mbps E3 tributary. The multiplexer / demultiplexer also does the reverse processing i.e. demultiplexing a received 34Mbps stream into 16, 2Mbps E1 tributaries.

E3, 2/34Mbps PDH Multiplexer

VCL-2/34 Mbps Multiplexer system consists of two VCL-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.

The VCL - 2/34 MBit/Sec. Digital PDH Multiplexer provides 16, 2Mbps E1 electrical interfaces which are multiplexed to 1, ITU-T compliant E3, 34MBits/Sec. G.703 electrical interface.

Features and Highlights

Features

  • 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
  • TCP/IP Remote Access for monitoring alarms and management
  • Remote (TCP/IP) and local (RS232) terminal monitoring and control by Network Management System.

Highlights

  • 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.

The system may be deployed independently (with an industry standard OLTE) or in conjunction with Valiant's Optical Line Terminating Equipment (OLTE) in the following applications:

  • To provide inter-connectivity between two small switches (central offices).
  • To provide connectivity between the Central Office and the Remote Site in "Fiber In The Local Loop" application.
  • To connect ISP's (Internet Service Providers) to the "telco".
  • To provide an intermediate connecting link at 34MBits/Sec. in mixed PDH/SDH networks.

External Interfaces

VCL-E3 unit provides the following interfaces to the external world:

  • 16, primary rate, 2Mbps, 120 ohm balanced interface
  • 1, third order, 34Mbps, 75 ohm unbalanced interface
  • -48V input for VCL-2/34 on-board power supply
  • RS232 / 10BaseT  interface for connection to Network Management System, used for configuration and monitoring of the VCL-2/34 multiplexer.
  • NO/NC Dry contact relay alarm.

Programming and Monitoring

VCL-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 local / remote identity for each VCL -2/34Mbps Multiplexer system
  • Specifying the priority sequence for clock selection.
  • Setting local or remote loopbacks on 2Mbps or 34Mbps
  • Enabling or disabling 2Mbps channels
  • Initiating self tests.

Status Monitoring

  • Presence or absence of remote terminal
  • 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
  • Master / Slave status
  • Monitoring healthy / unhealthy state of microcontroller and 2Mbps line interface units

Technical Specifications

Electrical Interface

Specification 2MBit/Sec Port

34MBit/Sec. Port

Bit rate 2048 KBits/Sec. 34368 KBits/Sec.
Tolerance ± 50ppm. ± 20ppm.
Interfaces 16, G.703 1, G.703
Frame Structure as per G.704 as per G.751
Line Code HDB3 HDB3
Signal Level 2.37 V/ 3.0 V p 1.0 V p
Impedance 75 W Un-Balanced, 120 W Balanced 75 W Un-Balanced
Permissible Attenuation 6 dB at 1024 KHz. 12 dB at 17184 KHz
Connectivity RJ45 connector (120 Ohms) BNC connector (75 Ohms)
Cable 120 W balanced 75 W unbalanced
Power Supply Input: -40 to -60 VDC
Temperature -10°C to 50°C
Dimensions 19 inch, DIN 2U height, 480 mm (width), 260 mm (depth).
Net Weight 4.30 Kgs.

Programming and Monitoring

VCL-2/34 Mbps Multiplexer offers programming via an RS232 port for control and monitoring of the terminals.

Programming Features

  • Presence or absence of remote terminal
  • Status of alarm(s)
  • Specifying the priority sequence for clock selection
  • Setting local or remote loopbacks on 2Mbps or 34Mbps
  • Enabling or disabling 2Mbps channels
  • Initiating self tests

Status Monitoring

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