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Valiant's
Opti-Multiplexer solution multiplexes, 4 E1 stream into one 8 Mb signal and then transport
it on a 1300 nm Single Mode Optical Fiber pair. On the de-multiplex side, it receives the
optical signal and de-multiplexes it into 4, electrical E1 signals.
The card uses one E1 quad line unit for
interfacing to E1 streams. This device provides data and extracted jitter free clock
meeting the G.703 standards. The jitter attenuater meet G.735 specifications. The
multiplexer device provides for in-built DPLL circuits for recovery of received E1 clocks.
The device provides various alarm conditions as per draft G.775 recommendations. These
include loss of signal at E1, loss of signal at E2, loss of frame sync at E2, detection of
AIS at E2 and bit error exceeding 1 in 1000. The output of the mux chip is connected to E2
line interface unit which provides the HDB3 coder along with clock extraction. The control
functions are carried out by a micro controller.
The power supply module accepts-48VDC input
and provides 5V output required for the operation of the card.
Features
A compact solution that performs E1 to E2 multiplexing
and de-multiplexing and provides an 8Mbps optical interface (8Mbps OLTE) in a single card
Conforms to ITU recommendations G.742
Performs Second order Mux as per G.742
Loss of signal and AIS detection as per G.775
Tributary and higher order loop backs supported
Supports tributary loopbacks for commands received from far
end based on stuff bit polarity
Single-card implementation
Highly reliable and compact.
Standard CCITT Interfaces
Class I Laser.
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- Highlights
- Remote and local terminal monitoring
and control through a PC Com port using VCL-Opti-Multiplexer, Network Management System.
- Extensive alarms and status indication facility.
- 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 the 8Mbps stream for
diagnostics.
- Programmable auto-laser shut down feature for greater
safety.
- Capable of synchronizing on any of the clock sources -
internal, or extracted (loop-timed).
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External Interfaces
& Connectors
VCL Opti-Multiplexer unit provides the
following interfaces to the external world:
- 4, Primary rate 2Mbps & 120 Ohms balanced E1 interfaces
- 1300nm, Single Mode optical fiber interface, Tx and Rx
through FC/PC Connectors
- -48V input for on-board power supply
- RS232 interface for connection to Network Management System,
used for configuration and monitoring of the Opti-Multiplexer system.
- 2 External alarm extensions for visual and audible alarms.
Alarms
The equipment provides the following alarms through visual
indication
- Power supply failure alarm
- Higher order loss of signal alarm
- Higher order AIS indication alarm
- Loss of frame sync alarm
- Bit error rate alarm
- Loss of signal alarm for each tributary
- Remote alarm
The equipment provides the following alarms and monitoring
facilities through visual indications and Windows based GUI.
- Loss of Digital Signal (TLOS)
- BER3
- BER6
- Laser Bias Current (LBIASC)
- Optical Loss of frame (OPLOF)
- The equipment provides for loop backs for diagnostic purpose
- Optical signal detection (SIG-DET)
- End of Life Detect (Optical module)
- Optical Transmit disable (OPTITXDIS)
- Auto-Laser Off
- Prompt Alarm
- Loop Back detection
These alarm condition except PSU failure,
are extended to the bay top by two potential free make contacts. These alarms, optionally,
are also transmitted over the RS232C serial link.
Related Links
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VCL - E2, Optical Multiplexer (4E1) is an
Integrated OLTE and multiplexer / demultiplexer unit, based on PDH (Plesiochronous Digital
Hierarchy) technology. It multiplexes four 2.048 Mbps (hereafter referred to 2Mbps) E1
tributaries into a single 8 Mbps, E2 stream and then transports it as an optical signal on
a Single Mode, 1300nm optical fiber cable, without the use of ant signal repeaters up to a
distance of over 50 KM (Optical Loss Budget ³ 30dBm). The muldex also does the reverse processing i.e.
demultiplexing a received optical signal into four 2Mbps E1 tributaries.
