1. Orion Telecom Networks Inc., 2003-2004 VCL-STM-1 VCL100MC-1 (upto 63 E1) Confidential Slide 1 Updated : January 2004 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 A compact, modular, and cost effective STM-1 SDH Multiplexer equipment. Manage bandwidth and provide E1 or fractional E1, voice and data access service over STM Networks. Customized for the traffic demands, in the access network, typical of residential or business customers. Supports end-to-end provisioning and management of services across all the segments of the optical network. Combines innovative optical networking software with the intelligence of SONET/SDH to deliver a flexible, cost-effective network solution. VCL-STM-1 (upto 63 E1) VCL-MC100-1

3. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 3 E1/DS1, E3/DS3 Multiple tributary slots Low priced Terminal Multiplexer and Add- Drop Multiplexer 3U chassis - available in rack mounting option Integrated multi-service delivery Direct Ethernet-to- SDH / SONET mapping using built-in 10/100 Base-T Interfaces Linear and ring topologies Multi-level protection schemes - Unprotected, MSP, SNCP Advanced networking software with support for open standards such as OSPF Features VCL-STM-1 (upto 63 E1) VCL-MC100-1

4. Orion Telecom Networks Inc., 2003-2004 Flexibility and modularity in tributary configurations Can be placed in customer premises or PoP's with space constraints. Compact size Provision both voice and data services from the same platform. Efficient use of transport bandwidth by supporting per-port rate adaptive Ethernet services. Enables creation of point-to-point Transparent LAN services or Virtual Private Network Services Topology support to cater to customer network scenarios Carrier-grade protection schemes enable you to cater to differing customer protection requirements. Enables automatic topology discovery, shared mesh restoration and Point-and-Click Provisioning (PNCP). User friendly GUI based Network Element Software for local and remote provisioning Advantages VCL-STM-1 (upto 63 E1) Confidential Slide 4 VCL-MC100-1

5. Orion Telecom Networks Inc., 2003-2004 Benefits "Build as you grow". Pay for capabilities you require today. A practical and cost effective solution catering to low volume traffic requirements. Better utilization of available rack space and easy installation in customer premises. Future-proof architecture protecting investment Cost-effective methods to create new Ethernet Data Services for incumbent or new carriers Flexible and cost-effective network solutions Creation of differentiated services to enhance the portfolio of service offerings Reduction in operational costs and increase in efficiency through lower provisioning time and operator intervention VCL-STM-1 (upto 63 E1) Confidential Slide 5 VCL-MC100-1

6. Orion Telecom Networks Inc., 2003-2004 Network Element Software (NES) The VCL100MC-1 node is managed through the embedded (Network Element Software). The main capabilities are listed below: Switch over to redundant power supply in the event of any hardware fault. Auto Recovery after Input Power Failure in a redundant system Node-wise Operations & Maintenance User programmable severity levels for Alarms Node-wise Alarming & Remote Login. Performance monitoring as per the standard specifications (G.826). In-service monitoring of E1 tributaries. VCL-STM-1 (upto 63 E1) Confidential Slide 6 VCL-MC100-1

7. Orion Telecom Networks Inc., 2003-2004 10/100 Mbps half-duplex LAN interface for NMS data connection to VCL100MC-1 node (RJ45 connector) RS232C Craft interface for local Command Line Interface data connection 2 wire analog telephone interface for Engineering Order Wire (E1 or E2 bytes access) with omnibus calling Network Management System (NMS) The STM-1 / STM-4 provides support for centralized network management through Network Management System (NMS). Operations Interfaces VCL-STM-1 (upto 63 E1) Confidential Slide 7 VCL-MC100-1

8. Orion Telecom Networks Inc., 2003-2004 Government Campus University Campus STM-4 Metro Ring Corporate HQ VCL100MC-1BTS Cable Operator E1/ 10 BaseT Ethernet E1/E3/STM-1 10 BaseT Ethernet Small Business Residential Campus Confidential Slide 8 Applications VCL100MC-1 E1/E3/STM-1 10 BaseT Ethernet 10 BaseT Ethernet 10/100 BaseT VCL100MC-1 E1/E3/STM-1 10 BaseT Ethernet VCL100MC-1 Corporate LAN E1s VCL-STM-1 (upto 63 E1)

9. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 9 Technical Specifications Network Topology Linear Ring Network Element Configurations Terminal Multiplexer (TMUX) Add-Drop Multiplexer (ADM) Regenerator STM-1 Cross connect Line Side (Aggregate) Optics 2 X STM-1 1310 or 1550 nm (ITU-T G.957 Compliant) 2xSTM-1e S/L 1.1, S/L 1.2 Tributary Interfaces E1/DS1, E3/DS3 Electrical STM-1o STM-1e 10 /100 Ethernet Modularity Separate tributary cards Modular in design, capable of tributary upgrades in steps of 21 E1 or 1E3 Mix and match tributaries - E1, E3, DS3, 10/100 Ethernet Cross Connect 252 X 252 VC-12 Fully non blocking Line to Line, Line to Tributary, Tributary to Line, Tributary to Tributary Continue... VCL-STM-1 (upto 63 E1) VCL-MC100-1

10. Orion Telecom Networks Inc., 2003-2004 Protection SNCP/ 1+1 MSP (as per G.841) VC-12, VC-3 level path protection Optional Hardware Redundancy Power Supply Card Maintenance Higher-order and Lower-order POH, all SDH level performance monitoring (as per ITU-T G.826 and ITU-T G.784) Local & remote loop back Software downloads Power Supply -48V DC nominal, -36V to –60V DC Power consumption: 35W (without Ethernet Interfaces) Management NES ( Network Element Software), supports full FCAPS functionality via web browser interface. SNMP interface for NMS RS-232 port for craft interface V.24/V.28 Modem interface for remote management In-band control supported using SDH Overhead 10/100Base-T/RJ45 management interface Alarm Signaling Indicators and External Contacts VCL-STM-1 (upto 63 E1) Confidential Slide 10 Continue... VCL-MC100-1

11. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 11 Timing & Synchronization Timing & Synchronization of System (as per ITU-T G. 813) Internal and External Timing interfaces – Two E1 BITS interfaces (as per ITU-T G.703) Internal oscillator capable of supplying a ITU-T G.813 compliant Stratum-3 SEC Support of SSM byte Accepts/ Provides 2Mbps/2MHz clock references Order wire support, Alarms and User data Channel E1/E2 bytes used for Express order wire (Omnibus/ Selective calling facilities) Five potential-free outputs and two potential-free inputs F1 byte for user data channel Physical Dimensions Dimensions (H X W X D): 132 mm x 435 mm x 220 mm Environmental Operating Temperature: 0° to 50° C Relative Humidity: 10% to 90%, non-condensing VCL-STM-1 (upto 63 E1) VCL-MC100-1

12. Orion Telecom Networks Inc., 2003-2004 VCL Products Confidential Slide 12 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 E2 (4E1) & E3, 34Mbps Optical Line Transmission Equipment (OLTE) Remote Asset Management Systems STM 1 / STM 4 - SDH Equipment 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