E3, 2/34 Mbps PDH Multiplexer
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Multiplexers
Orion Telecom Networks Inc. offers 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.
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. Both local and remote terminals can be monitored and controlled by a Network Management System (NMS) connected to the local terminal.
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 Orion'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
Application Diagram
ISP E3, 34Mbps Multiplexer (Cisco E3 - Router Application)
