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.

EXTERNAL INTERFACES AND CONNECTORS:

E2 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.