1. Copyright : Valiant Communications Limited - 2007Slide 1 E2, 2Mbps x 4 Opti Multiplexer Integrated E2, OLTE and Multiplexer V aliant C ommunications L imited Telecom Transmission Solutions Updated : March, 2007 U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, 310-328 Uxbridge Road, London W3 9QN, United Kingdom E-mail: gb@valiantcom.com Website: http://www.valiantcom.com INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi - 110015, India Phone: +91-11 4105 5601, 91-11 4105 5602 Fax: +91-11 4105 5604, 91-11 2543 4300 E-mail: getinfo@valiantcom.com Website: http://www.valiantcom.com U.S.A. Valcomm Technologies Inc. 4000 Ponce de Leon, Suite 470 Coral Gables, FL 33146 United States of America E-mail: us@valiantcom.com Website: http://www.valiantcom.com

2. Copyright : Valiant Communications Limited - 2007Slide 2 E2, 2Mbps x 4 - Opti Multiplexer Product Overview VCL-E2, Opti Multiplexer (4E1) is an Integrated OLTE and multiplexer/ demultiplexer unit, based on PDH (Plesiochronous Digital Hierarchy) technology It multiplexes four 2.048Mbps (hereafter referred to 2Mbps) E1 tributaries into a single 8Mbps, 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 50KM (optical loss budget 30dBm) On the demultiplex side, it receives the optical signal and demultiplexes it into 4, electrical E1 signals This device provides data and extracted jitter free clock meeting the G.703 standards 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 VCL-E2, Opti Multiplexer is available in 1310nm 1550nm.

3. Copyright : Valiant Communications Limited - 2007Slide 3 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 Features E2, 2Mbps x 4 - Opti Multiplexer

4. Copyright : Valiant Communications Limited - 2007Slide 4 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). E2, 2Mbps x 4 - Opti Multiplexer Highlights

5. Copyright : Valiant Communications Limited - 2007Slide 5 Front Panel View of VCL-E2 Opti Multiplexer LEDs Indications + 5V DC present -48V DC present Loss of signal at 2Mbps - channel 4 Loss of signal at 2Mbps - channel 3 Loss of signal at 2Mbps - channel 2 Loss of signal at 2Mbps - channel 1 AIS at 8Mbps Optical signal - Sync Green = Sync., Optical signal present Red = Loss of Sync., Optical signal absent. 19 inch Shelf Tx Rx 1 2345 6 7 VCL-E2 OPTI MULTIPLEXER E2, 2Mbps x 4 - Opti Multiplexer

6. Copyright : Valiant Communications Limited - 2007Slide 6 Rear View of VCL-E2 Opti Multiplexer (120 Ohms Ver.) (120 Ohms balanced E1 ports) 120 Ohms, RJ-45, E1 Interface Connectors - 4, E1 Channels Power Network/System Management Port Audio AlarmVideo Alarm E2, 2Mbps x 4 - Opti Multiplexer

7. Copyright : Valiant Communications Limited - 2007Slide 7 Rear View of VCL-E2 Opti Multiplexer (75/120 Ohms Ver.) (120 Ohms balanced, 75 unbalanced E1 ports) E2, 2Mbps x 4 - Opti Multiplexer E2, Opti Multiplexer Back View 75 Ohms BNC, E1 Interface Connrctors - 4 E1 channels

8. Copyright : Valiant Communications Limited - 2007Slide 8 Technical Specifications 2Mbps, E1 Electrical Interface Continue.. Number4 Nominal bit rate2048kbps Bit rate tolerance± 50ppm Termination Impedance120 Ohms Line code HDB3 Frame structureAs per G.704 Electrical InterfaceAs per G.703 Peak Voltage of a mark For 120  Balanced interface3.0 V ± 0.3 V 75  Unbalanced interface2.37 V ± 0.237 V Peak Voltage of a space for 120  Balanced interface0 V ± 0.3 V 75  Unbalanced interface0V ± 0.237 V E2, 2Mbps x 4 - Opti Multiplexer

9. Copyright : Valiant Communications Limited - 2007Slide 9 Maximum Output Jitter  0.05UI Maximum Input Jitter 20Hz to 93Hz1.5UI 700Hz to 100Hz0.2UI ConnectivityRJ-45 Connectors, (120 Ohms, balanced) and BNC (75 Ohms, unbalanced) Cable 120 Ohms balanced, 75 Ohms unbalanced Permissible Attenuation6dB (max) @1024KHz Return Loss at input port 51.2KHz to 102.4KHz>12dB 102.4KHz to 2048KHz>18dB 2048KHz to 3072KHz>14dB Continue.. E2, 2Mbps x 4 - Opti Multiplexer

10. Copyright : Valiant Communications Limited - 2007Slide 10 Transmitter Type of TransmitterClass I Laser Number 1 Nominal bit rate8.448Mbps, +/-30PPM Kbps Transmit wavelength1310nm Transmit output0dBm to -3dBm (average) Extinction ratio>1:10 Transmit Spectral Width<4nm Receiver Number1 Receiver sensitivity-37dBm (typical) -36dBm (min) Receive wavelength1310nm Operating wavelength range1280-1335nm Receiver dynamic range  20dBm Optical ConnectorsFC-PC connector E2, 2Mbps x 4 - Opti Multiplexer 8 Mbps, E2 Optical Interface

11. Copyright : Valiant Communications Limited - 2007Slide 11 E2, 2Mbps x 4 - Opti Multiplexer Valiant’s Products Digital Access Cross Connects - E1 / T1, E3, DS3, 10/100 BaseT Ethernet Groomers (Hi-Z Non-intrusive Hi-Impedance Monitoring) 1+1 APS (Automatic Protection Switching) Echo Canceller & Voice Quality Enhancement Solutions - E1, T1, DS3 and STM-1 E1 Drop-Insert (Add-Drop) Voice and Data Multiplexers E1, T1, E3, DS3, Ethernet Converters STM-1 Add Drop Multiplexer with Ethernet GSM Gateways - E1/T1 E1 PRI ISDN (Euro ISDN) Q.931 Multiplexers Channel Banks E2 (4 E1), 2/34 Mbps PDH Multiplexer, 34 Mbps OLTE Remote Site Monitoring Equipment

12. Copyright : Valiant Communications Limited - 2007Slide 12 E2, 2Mbps x 4 - Opti Multiplexer Thank you for your attention For more details visit us at our Website at http://www.valiantcom.com U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, 310-328 Uxbridge Road, London W3 9QN, United Kingdom E-mail: gb@valiantcom.com Website: http://www.valiantcom.com INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi - 110015, India Phone: +91-11 4105 5601, 91-11 4105 5602 Fax: +91-11 4105 5604, 91-11 2543 4300 E-mail: getinfo@valiantcom.com Website: http://www.valiantcom.com U.S.A. Valcomm Technologies Inc. 4000 Ponce de Leon, Suite 470 Coral Gables, FL 33146 United States of America E-mail: us@valiantcom.com Website: http://www.valiantcom.com