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E3, 2/34Mbps PDH Multiplexer |
Description
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.
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.
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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
Application
Diagrams:
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
Related Links
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