E3,
2/34 Mbps PDH Multiplexer
| VCL
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.
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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
- Remote and local terminal monitoring and control by Network
Management System
- Optional TCP/IP Remote Access for monitoring alarms
and management
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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
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External Interfaces
VCL-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 VCL-2/34 on-board power supply
- RS232 interface for connection to Network Management System,
used for configuration and monitoring of the VCL-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
L4- E3 CLK FAULT
L5- E3 REMOTE ALARM
L6- E3 AIS ALARMRJ-45 "LAN Port" |
L7- E3 TX FAULT
L8- E1 LOS
L9- ST ERROR
L10- "LAN ON"
L11- Positive 5V present
L12- Negative 48V input
presentSW1 "LAN ON / OFF" Toggle Switch
SW2 LAN Reset Switch |
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.
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Programming
Features
- Setting loopbacks on 2Mbps or 34Mbps
- Enabling or disabling 2Mbps channels
- Initiating self tests
- Alarm acknowledgment option
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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
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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, VCL-2/34Mbps
Multiplexer is provided with LEDs on the front panel of the multiplexer, which indicate
various fault conditions.
- Monitoring VCL-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
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- Excessive Error Rate at 34Mbps
- +5V failure
- -48V input failure
- Processor unhealthy alarm
- Prompt Maintenance alarm
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Others Links
Technical specifications are subject to change
without notice.
All brand names and trademarks are the property of their respective owners.
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