1. Orion Telecom Networks Inc., 2003-2004 VCL-STM-1 VCL100LT (upto 28 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 Intelligent STM-1 equipment. Designed to meet low traffic demands from residential or business customers An ultra-compact 1U height unit Can be configured as a Terminal Multiplexer (TMUX) or an Add-Drop Multiplexer (ADM), with E1, E3 or 10Mbps Ethernet service interfaces and trunk interfaces at STM-1 rate. 10/100BaseT Ethernet data interface Supports end-to-end provisioning and management of voice and data services across all the segments of the optical network. Built in non-blocking cross-connect at VC-3 and VC-12 granularity for efficient traffic grooming. Provides an Ethernet tributary interface to carry inter-office traffic from corporate LANs, campus networks or from ISPs. VCL-STM-1 (upto 28 E1)

3. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 3 Features Low priced Terminal Multiplexer and Add-Drop Multiplexer Seamless integration with the VCL100 family of equipment and management Support for E1 / DS1, E3 / DS3 and 10/100BaseT tributaries 1U chassis- available in rack and wall mounting options Support for power supply redundancy Order-wire capability Linear and ring topologies Multi-level protection schemes-Unprotected, MSP, SNCP Advanced networking software with support for open standards such as- GMPLS and OSPF VCL-STM-1 (upto 28 E1)

4. Orion Telecom Networks Inc., 2003-2004 Advantages VCL-STM-1 (upto 28 E1) Can be placed in customer premises or access nodes Allows growth of network with more choices from a common family of products and with a single type of element management system 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 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 Confidential Slide 4

5. Orion Telecom Networks Inc., 2003-2004 Benefits VCL-STM-1 (upto 28 E1) A practical and cost-effective solution catering to low volume traffic requirements Easy and cost effective option to grow to a larger network with minimum increase in overhead costs Better utilization of available rack space and easy installation in customer premises Future proof architecture protecting investment 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 Confidential Slide 5

6. Orion Telecom Networks Inc., 2003-2004 Network Element Software (NES) The VCL100LT 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 28 E1) Confidential Slide 6

7. Orion Telecom Networks Inc., 2003-2004 10/100 Mbps half-duplex LAN interface for NMS data connection to VCL100LT 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 In-band control channel supported for remote management (F2 & F3 bytes used from POH Network Management System (NMS) The STM-1 provides support for centralized network management through Network Management System (NMS). Operations Interfaces VCL-STM-1 (upto 28 E1) Confidential Slide 7

8. Orion Telecom Networks Inc., 2003-2004 Government Campus University Campus STM-1 Ring Corporate HQ VCL100LTBTS SOHO E1/ 10 BaseT Ethernet E1/E3/STM-1 Small Business Residential Campus Confidential Slide 8 Applications VCL100LT STM-1 10 BaseT Ethernet 10/100 BaseT E1/E3/DS3/STM-1 VCL100LT Corporate LAN E1s VCL-STM-1 (upto 28 E1) VCL100LT VCL-STM-1/4 VCL100LT E1/E3/STM-1 MTU

9. Orion Telecom Networks Inc., 2003-2004 Confidential Slide 9 Technical Specifications Continue... VCL-STM-1 (upto 28 E1) Network Topology Linear Ring Network Element Configurations STM-1 Add & Drop Multiplexer (ADM) STM-1 Terminal Multiplexer (TMUX) Line Side (Aggregate) Optics 2 x STM-1 1310/1550 nm S1.1, S1.2 L1.1, L1.2 Tributary Interfaces E1 / DS1 Electrical Interfaces E3 / DS3 Electrical Interfaces 10/100 Ethernet Connection Matrix 252 X 252 VC-12 cross connect, non blocking Line-to-Line, Line-to-Tributary, Tributary-to-Line and Hair-pinning Protection 1+1 SNCP (as per G.841) 1+1 linear APS (as per G.841) VC-12, VC-3 level path protection Maintenance Higher-order and Lower-order POH, SDH level alarm and performance monitoring (as per G.826 and G.784) Local & remote loop back Software downloads

10. Orion Telecom Networks Inc., 2003-2004 VCL-STM-1 (upto 28 E1) Power Supply -Feed -48V DC (Redundant) Input tolerance: -40V to -60 V DC Low power consumption - less than 35W Physical Dimensions H X W X D : H X W X D (44 mm x 435mm x 300 mm) Environmental Operating Temperature: 0° to 50° C Relative Humidity: 10% to 90%, non-condensing Redundancy Redundant Power Supply Unit - Optional 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 Supported using SDH Overhead 10/10OBase-T interface Alarm Signaling Indicators and External Contacts Confidential Slide 10

11. Orion Telecom Networks Inc., 2003-2004 VCL Products Confidential Slide 11 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