1. Orion Telecom Networks Inc. - 2006Slide 1 E2, 2Mbps x 4 Opti Multiplexer Integrated E2, OLTE and Multiplexer Updated : January, 2006 16810, Avenue of Fountains, Suite # 108, Fountain Hills, AZ 85268, U.S.A. Phone: +1 (480) 816-8672 Fax: +1 (480) 816-0115 E-mail: sales@oriontelecom.com Web Site: http://www.oriontelecom.com

2. Orion Telecom Networks Inc. - 2006Slide 2 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 loop backs 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

3. Orion Telecom Networks Inc. - 2006Slide 3 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 - 48 VDC input Distributed on-board power supply. Microprocessor controlled with powerful diagnostic facilities for both remote and local systems. Local and remote loop back 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

4. Orion Telecom Networks Inc. - 2006Slide 4 FRONT PANEL VIEW OF VCL-E2 Opti Multiplexer 19 inch Shelf LEDs Indications + 5 VDC present -48 VDC 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. Tx Rx 1 2345 6 7 VCL-E2 Opti Multiplexer E2, 2Mbps x 4 - Opti Multiplexer

5. Orion Telecom Networks Inc. - 2006Slide 5 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

6. Orion Telecom Networks Inc. - 2006Slide 6 REAR VIEW OF VCL-E2 Opti Multiplexer (75/120 Ohms Ver.) (120 Ohms balanced, 75 unbalanced E1 ports) 75 Ohms, BNC, E1 Interface Connrctors - 4, E1 channels E2, 2Mbps x 4 - Opti Multiplexer E2 Opti Multiplexer Back View

7. Orion Telecom Networks Inc. - 2006Slide 7 Technical Specifications Number1 Nominal bit rate2048kbps Bit rate tolerance± 50ppm Termination Impedance120 Ohms / 120 Ohms and 75 Ohms Line codeHDB3 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 2Mbps, E1 Electrical Interface Continue.. E2, 2Mbps x 4 - Opti Multiplexer

8. Orion Telecom Networks Inc. - 2006Slide 8 Maximum Output Jitter  0.05UI Maximum Input Jitter 20Hz to 93 Hz1.5UI 700Hz to 100Hz0.2UI ConnectivityRJ-45 Connectors, BNC Connectors Cable 120 ohms balanced, 75 Ohms unbalanced Permissible Attenuation6 dB (max) @1024 Khz Return Loss at input port: 51.2 KHz to 102.4 KHz>12dB 102.4KHz to 2048 KHz>18dB 2048 KHz to 3072 KHz>14dB Continue.. E2, 2Mbps x 4 - Opti Multiplexer Technical Specifications

9. Orion Telecom Networks Inc. - 2006Slide 9 8 Mbps, Optical Interface TRANSMITTER: Type of TransmitterClass I Laser Number 1 Nominal bit rate8.448 Mbps, +/-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 Technical Specifications

10. Orion Telecom Networks Inc. - 2006Slide 10 Orion’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 E2, 2Mbps x 4 - Opti Multiplexer

11. Orion Telecom Networks Inc. - 2006Slide 11 E2, 2Mbps x 4 - Opti Multiplexer Thank you for your attention For more details visit us at our Website at http://www.oriontelecom.com 16810, Avenue of Fountains, Suite # 108, Fountain Hills, AZ 85268, U.S.A. Phone: +1 (480) 816-8672 Fax: +1 (480) 816-0115 E-mail: sales@oriontelecom.com Web Site: http://www.oriontelecom.com