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.

• 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.

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).

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.

• E2, Opti-Multiplexer - Technical Specifications

Application Diagrams

• E2, (4E1) with TCP-IP access option 1
• E2, (4E1) with TCP-IP access option 2
• Fiber Optic transmission application
• Network configuration (E1, E2, E3, OLTE)

Related Links

• 4 E1 Optical Multiplexer plus Ethernet with SNMP
• 8 E1 Optical Multiplexer plus Ethernet with SNMP
• E3, 2/34Mbps Multiplexer
• E3, 34Mbps Optical Line Transmission Equipment (OLTE / OLTE)
• Optical Transmission solutions
• Multiplexers
• Channel Banks