1. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 1 Updated : 20th January, 2004 VCL-DX ™ 2Mbps E1, Drop-Insert Pure Data Multiplexer Telecom Transmission Solutions O RION T ELECOM N ETWORKS I NC. 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., 2003-2004 Confidential Slide 2 Product Overview E1 Data, Drop-Insert (Add-Drop) Multiplexer Provides wide range of digital data services Integrates analog communication equipment with digital E1 interface. Effective CLI (text) based "Network Management System", Remote monitoring and management of the inter-connected systems. Both Inband and Out-Of-Band configuration and monitoring options An extensive set of alarms, for easy maintenance are provided in the system. VCL-DX, Pure Data Multiplexer

3. Orion Telecom Networks Inc., 2003-2004 The Multiplexer may be used in Terminal or Drop-Insert (Add-Drop) configuration to provide: Interconnect LAN (Campus Network) Interconnect Computer Terminals Provide LAN-WAN Interconnectivity Provide Leased Lines on DSL for SOHO Applications Confidential Slide 3 VCL-DX, Pure Data Multiplexer

4. Orion Telecom Networks Inc., 2003-2004 Data Interface Options V.35, n X 64 Kbps V.36, n X 64 Kbps X.21, n X 64 Kbps RS530, n X 64 Kbps G.SHDSL, n X 64 Kbps 10BaseT - Router Fractional E1 Confidential Slide 4 VCL-DX, Pure Data Multiplexer

5. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 5 Features Digital Data services. Any combination ("mix-n-match") of Digital Data services deployed from a single VCL-DX "Smart Shelf". Drop and Insert applications. Digital Data option may be used for internet access or video conferencing application. Wireless applications including interconnecting of Cellular Networks. Interconnecting VoIP networks. SCADA applications. Frame Relay circuit termination. Powerful Network Management System for monitoring and network control. Compliance with all relevant ITU-T (CCITT) recommendations. 3U high, compact construction. VCL-DX, Pure Data Multiplexer

6. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 6 Highlights Field upgradable to provide data or both services. Flexibility on use of transmission medium - copper, fiber, or wireless. Choice of Interfaces for Data Applications. RS-232, PC Interface "Network Control And Management Software". In-band system configuration and management interface. Out-of-band system configuration and management interface through 10BaseT Terminal (Optional) Channel assignment independent of slot position in the subrack. Extensive set of alarms. User Selectable Internal or Loop-Timed clock options VCL-DX, Pure Data Multiplexer

7. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 7 Transmission Mediums Copper Optical Fiber Wireless VCL-DX, Pure Data Multiplexer

8. Orion Telecom Networks Inc., 2003-2004 Applications of VCL-DX Digital data, or real-time video conferencing services (V.35, V.36, X.21, Rs530, 10BaseT Router ) high-speed digital data interface options allows video conferencing channel of up to 1984 Kbps). Drop & Insert applications. Wireless network applications. High-speed data ports for digital communication links providing Leased Lines access to Internet Service Provider (ISPs) with speeds ranging from 64Kbps up to 1984 Kbps digital data interface options. Micro-Cellular infrastructure applications for providing cell-switch connectivity. Wide area networking. Confidential Slide 8 VCL-DX, Pure Data Multiplexer

9. Orion Telecom Networks Inc., 2003-2004 Number of Interfaces2 Conformity (Electrical)G.703 Frame StructureAs per ITU (CCITT) G.704 SignalingChannel Associated Signaling PCM Sampling Rate8000 Samples / sec Encoding LawA Law as per ITU (CCITT) Bit Rate2048 Kbps ± 50 ppm CodeHDB3 Nominal Impedance120  balanced / 75  unbalanced (75  option) Peak Voltage of a mark For 120  Balanced interface3.0 V ± 0.3 V 75  Unbalanced interface2.37 V ± 0.237 V Confidential Slide 9 Continue... E1 Interface (Main Link) Technical Specifications VCL-DX, Pure Data Multiplexer

10. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 10 Peak Voltage of a space for 120  Balanced interface0 V ± 0.3 V 75  Unbalanced interface0V ± 0.237 V Nominal Pulse Width244 ns Pulse Maskas per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz) Permissible Attenuation6 dB at 1 MHz Return Loss at: 51.2 KHz to 102.4 Khz> 12dB 102.4 KHz to 2048KHz> 18dB 2048KHz to 3072 Khz> 14dB Jitter ToleranceAs per ITU (CCITT) G.823 Loss and recovery of frame alignment :As per clause 3 of ITU (CCITT) G.732 Loss and recovery of multiframe alignment : As per clause 5.2 of ITU (CCITT) G.732 Continued from E1 Interface (Main Link)... VCL-DX, Pure Data Multiplexer

11. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 11 InterfaceV.35 Number of Interfaces per Card 1, (”N” x 64KBits/sec. per Card) Bandwidth(”N” x 64 Kbits / sec. Interface maximum value of “N” =3 1) - User Selectable ConformityV.35 ModeSynchronous Bit Rate64 Kbps to 1984 Kbps User InterfaceDCE High Speed Synchronous “n X 64” Data Interface Type: V.35 VCL-DX, Pure Data Multiplexer InterfaceV.36 Number of Interfaces per Card 1, (”N” x 64KBits/sec. per Card) Bandwidth(”N” x 64 Kbits / sec. Interface maximum value of “N” =31) - User Selectable ConformityV.36 ModeSynchronous Bit Rate64 Kbps to 1984 Kbps User InterfaceDCE High Speed Synchronous “n X 64” Data Interface Type: V.36

12. Orion Telecom Networks Inc., 2003-2004 InterfaceX.21 Number of Interfaces per Card 1, (”N” x 64KBits/sec. per Card) Bandwidth(”N” x 64 Kbits / sec. Interface maximum value of “N” =3 1) - User Selectable ConformityX.21 ModeSynchronous Bit Rate64 Kbps to 1984 Kbps User InterfaceDCE High Speed Synchronous “n X 64” Data Interface Type: X.21 Confidential Slide 12 VCL-DX, Pure Data Multiplexer InterfaceRS530 Number of Interfaces per Card 1, (”N” x 64KBits/sec. per Card) Bandwidth(”N” x 64 Kbits / sec. Interface maximum value of “N” =3 1) - User Selectable ConformityRS530 ModeSynchronous Bit Rate64 Kbps to 1984 Kbps User InterfaceDCE High Speed Synchronous “n X 64” Data Interface Type: RS530

13. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 13 Interface10BaseT (Router) Number of Interfaces per Card 1, (”N x 64” KBits/sec. per Card) Bandwidth(”N” x 64 Kbits / sec. Interface maximum value of “N” =3 1) - User Selectable IP routingRIP-I, RIP-II, static routing, IP filters, BootP client and relay, DHCP relay IPQoSBandwidth management (CBR, VBR), Priortization (6 levels), RTP auto detection, DiffServ/TOS support Bandwidth Optimization SW Compression (optional), MLPPP and Bandwidth on Demand, Connection on Demand and IPX spoofing Interoperability PPP Supported RFCs 1058, 1213, 1315, 1332, 1334, 1389, 1471, 1472, 1473, 1474, 1490, 1493, 1519, 1542,1573, 1604, 1631, 1638, 1661, 1662, 1722, 1723, 1724, 1812, 1850, 1962, 1974, 1990 High Speed Synchronous “n X 64” Data Interface Type: 10BaseT Ethernet Router Timing OptionsInternal Clock, Loop-Timed Clock Synchronization SourcesInternal Clock, span clock timing derived from incoming HDB3 links (Loop Timed) Default OptionInternal Clock Clock VCL-DX, Pure Data Multiplexer

14. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 14 Management Interface Local Management Interface RS232, operating @ 9.6 Kbps CLI (text) based Interface, Hyper Terminal (VT-100 Emulation). In-band Management Interface for Remote Terminals RS232, operating @ 9.6 Kbps CLI (text) based Interface, Hyper Terminal (VT-100 Emulation). Out-of-Band Management Interface - Optional 10 / 100 BaseT - User Assigned IP Address InterfaceG.SHDSL Number of Interfaces per Card 1, (”N” x 64KBits/sec. per Card) Bandwidth(”N” x 64 Kbits / sec. Interface maximum value of “N” = 31) - User Selectable ComplianceITU G.SHDSL (ITU-T / G.991.2) ETSI SDSL (ETSI TS 101 524) Handshake SupportITU G.hs (ITU-T G.994.1) ModeSynchronous Bit Rate128 Kbps to 1984 Kbps (User Selectable) User InterfaceLTU High Speed Synchronous “n X 64” Data Interface Type: G.SHDSL VCL-DX, Pure Data Multiplexer

15. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 15 Temperature and Humidity0°C to + 50°C, 90% R.H. (Non Condensing) Altitudeupto 9,000 feet Environmental Power Supply Input DC voltage-48V DC ( nominal ) Range of input-40V to -60V DC Output voltages+5V, -5V, filtered -48V ( for term. cards) Full Load Output Current8A at +5V, 0.5A at -5V Input Voltage Reversal ProtectionProvided in the Card Over Current Protection10A for +5V, 1.0A for -5V Short Circuit ProtectionCurrent limit - 6A. Recovers on removal of short Efficiency at full load>86% Ripple at full load<5mVrms Spike at full load<50mV Power Consumption20W (Worst - Case) - all data circuits active. VCL-DX, Pure Data Multiplexer

16. Orion Telecom Networks Inc., 2003-2004 VCL-DX Digital Data Drop-Insert Multiplexer with In-band Management Interface and “n” X 64 Kbps data options Power Supply Card User Configurable interface slots nx64 Interfaces: V.35 / V.36 / X.21 / RS530 / G.SHDSL / 10BaseT Confidential Slide 16 VCL-DX, Pure Data Multiplexer Control Card 1 Control Card 2

17. Orion Telecom Networks Inc., 2003-2004 Rear View Confidential Slide 17 VCL-DX, Pure Data Multiplexer 19-Inch Shelf 3U high19- Inch Shelf and BackplaneVCL-DX-001 Slot 1Power Supply CardVCL-DX-010 Slot 2 to 7 6 User Configurable “n” X 64 Kbps As per user requirement data interface(s Slot 8Control Card 1VCL-DX-020 Slot 9Control Card 2VCL-DX-021 Core System Composition Descriptions Part No.

18. Orion Telecom Networks Inc., 2003-2004 VCL Products E1, Voice & Data Drop-Insert Multiplexer PRI ISDN (Q.931) Multiplexers E1 Intelligent Channel Banks E1 / T1 DCME (Digital Circuit Multiplication Equipment) - Voice Compression Equipment Thin Route DCME E1 / T1 Echo Cancellers E1 / T1 Digital Cross Connect T1 / E1 Converters E3, 34Mbps Multiplexer 34Mbps Optical Line Transmission Equipment (OLTE) Remote Asset Management Systems STM 1 / STM 4 - SDH Equipment Confidential Slide 18 Thank you for your attention For more details visit us at our Web Site 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