1. VCL-CB E1, Intelligent Channel Bank V aliant C ommunications L imited Telecom Transmission Solutions Confidential Slide 1 Copyright, Valiant Communications Limited 2000-2005 Updated : January, 2005 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. For Voice termination on PSTN lines that "Support", or "Do Not Support" "Battery Reversal / Polarity Reversal" (Answer Supervision). Used in applications to deliver voice over an end- to- end E1 (radio / fiber / HDSL) links. Voice Activity Detection (VAD) to provide spoof Answer Supervision To provide Disconnect Supervision to disconnect hung PSTN lines. Provides complete line protection against difficult field conditions. INTRODUCTION Confidential Slide 2 VCL-CB-INT a). VCL-CB-INT E1 Channel Bank is an intelligent E1 Channel Bank that provides the metering function using Voice Activity Detection (VAD) to provide voice activated "answer supervision" and "disconnect supervision". Suited for Long Distance traffic VoIP termination. VCL-CB-BR b). VCL-CB-BR E1 channel bank provides answer supervision when the called party answers, upon receiving an actual battery reversal of the PSTN analog line. Used in conventional applications to deliver voice over an end-to-end E1 (radio / fiber / HDSL) links. Available with FXO, FXS and E&M interfaces. The E1 Channel Bank solution is available in two versions: VCL-CB, Intelligent E1 Channel Bank Copyright, Valiant Communications Limited 2000-2005

3. FEATURES For Voice termination on PSTN lines that "Support", or "Do Not Support" "Battery Reversal / Polarity Reversal" (Answer Supervision). Uses sophisticated DSP algorithms to provide Voice Activity Detection (VAD) to provide "Answer Supervision" to initiate metering and "Disconnect Supervision" feature to "Disconnect hung / stuck PSTN lines". Ruggedized equipment design. Provide complete protection against the line card failures occurring from induced voltages from AC power lines and lightening strikes and other difficult field conditions. VF (Voice Frequency) specifications are in accordance with G.712, ITU-T recommendations to provide clear voice. Suited for long distance call / traffic termination operators, corporate and ISP customers, who wish to connect their fully digital networks to the PSTN, through the available analog dial-up PTT lines. Available with an E1, 2Mbps interface or a fractional E1 interface (to even start service with less than 10 lines). BENEFITS Also used in conventional applications to deliver voice over an end-to-end E1 (radio / fiber / HDSL) links. Available with FXO, FXS and 2W/4W E&M customer interfaces. Compliance to all the relevant ITU-T recommendations. Modular, 3U high, compact construction provides easy maintenance. Plug & Play - easy to install equipment. Extensive set of alarms Available with easy to use Windows based Graphical User Interface. Synchronization to different user selectable clock sources. Remote Access through TCP/IP (for remote configuration and monitoring - available as an optional extra). Confidential Slide 3 Copyright, Valiant Communications Limited 2000-2005 VCL-CB, Intelligent E1 Channel Bank

4. Confidential Slide 4 Copyright, Valiant Communications Limited 2000-2005 VoIP Server PBX E1, CAS, R230 Analog Telephones Line For Dial In and Dial Out FXO / FXS / E&M VCL-CB-INT Channel Bank VCL-CB, Intelligent E1 Channel Bank VCL-CB-INT E1, Channel Bank Remote Access Server / VoIP Gateway Application

5. Twisted pair cable using E1 or HDSL Transport. 30 Voice & Data Channels VCL-CB Multiplexer 30 Voice & Data Channels VCL-CB, Intelligent E1 Channel Bank Confidential Slide 5 Copyright, Valiant Communications Limited 2000-2005 VCL-CB E1, 2Mbps Multiplexer Twisted Cable Pair

6. VCL-CB, Intelligent E1 Channel Bank Confidential Slide 6 Copyright, Valiant Communications Limited 2000-2005 30 Voice & Data Channels VCL-CB Multiplexer 30 Voice & Data Channels 2 Mbps Digital Radio 2 Mbps Digital Radio VCL-CB E1, 2Mbps Multiplexer Digital Microwave Radio Link

7. 30 Voice / Data Channel VCL-CB Multiplexer Optical Fiber 30 Voice / Data Channel Optical Interface Optical Interface VCL-CB, Intelligent E1 Channel Bank Confidential Slide 7 Copyright, Valiant Communications Limited 2000-2005 VCL-CB E1, 2Mbps Multiplexer Fiber Optic Transmission

8. VCL-CB, Intelligent E1 Channel Bank Confidential Slide 8 Copyright, Valiant Communications Limited 2000-2005 Office User LAN 10 BaseT iDSL Router iDSL @ 128Kbps upto 5 Km Twisted pair Cisco Compatible iDSL Solution 15, iDSL Subscribers @ 128 Kbps, each VCL-CB-iDSL ISP xxxx - Router CISCO E1 Internet Note: VCL-CB-iDSL, multiplexers 15, iDSL subscribers @ 128Kbps each, to an E1. VCL-CB-iDSL multiplexer, Cisco Compatible iDSL solution may be connected to any Cisco Router with an E1 interface on the ISP side. CPE (Customer Premises Equipment) includes Cisco Router with 4, 10base interfaces for PC/LAN connectivity in VCL-CB-iDSL Package VCL-CB iDSL Multiplexer Solution iDSL @ 128 Kbps Office Application

9. Single User PC 10 BaseT iDSL Router iDSL @ 128Kbps upto 5 Km Twisted pair 15, iDSL Subscribers @ 128 Kbps, each VCL-CB-iDSL ISP xxxx - Router CISCO E1 Internet Note: VCL-CB-iDSL, multiplexers 15, iDSL subscribers @ 128Kbps each, to an E1. VCL-CB-iDSL multiplexer, Cisco Compatible iDSL solution may be connected to any Cisco Router with an E1 interface on the ISP side. CPE (Customer Premises Equipment) includes Cisco Router with 4, 10base interfaces for PC/LAN connectivity in VCL-CB-iDSL Package Cisco Compatible iDSL Solution VCL-CB iDSL Multiplexer Solution iDSL @ 128 Kbps Home Application VCL-CB, Intelligent E1 Channel Bank Confidential Slide 9 Copyright, Valiant Communications Limited 2000-2005

10. Confidential Slide 10 Copyright, Valiant Communications Limited 2000-2005 Core System Composition:Part # (Common Equipment) 19-Inch ChassisVCL-CB-000 /005 -48VDC Power Supply CardVCL-CB-010 Control Card, E1 Interface CardVCL-CB-015-INT Ring Generator - Optional*VCL-CB-040 * Required only with FXS Interface Card User Interface Cards: FXO (Central Office Interface Card)VCL-CB-030-INT FXS (Remote / Subscriber Interface Card)VCL-CB-025 E&M (2 Wire / 4 Wire Interface Card)VCL-CB-035 Ordering Information Intelligent, E1 Channel Bank Core System Composition:Part # (Common Equipment) 19-Inch ChassisVCL-CB-000 /005 -48VDC Power Supply CardVCL-CB-010 Control Card, E1 Interface CardVCL-CB-015-BR Ring Generator - Optional*VCL-CB-040 * Required only with FXS Interface Card User Interface Cards: FXO (Central Office Interface Card)VCL-CB-030-BR FXS (Remote / Subscriber Interface Card)VCL-CB-025 E&M (2 Wire / 4 Wire Interface Card)VCL-CB-035 E1 Channel Bank VCL-CB, Intelligent E1 Channel Bank

11. Confidential Slide 11 Copyright, Valiant Communications Limited 2000-2005 Technical Specifications Number of E1 Interfaces1 Conformity (Electrical)G. 703 Frame StructureAs per ITU (CCITT) G.704 SignalingChannel Associated Signaling, (R2 Gen) R2 Generic in accordance with ITU-I Q.421 / Q.422 Rec. PCM Sampling Rate 8000 samples/sec Encoding LawA Law as per ITU (CCITT) G.823 Bit Rate2048 Kbps ± 50 ppm Code HDB3 Nominal impedance120 balanced (75 unbalanced - option on request) ConnectorRJ-45 (120 ohms impedance) Peak Voltage of a mark For 120 Balanced interface3.0 V ± 0.3 V 75 Unbalanced interface2.37 V ± 0.237 (Optional) Peak Voltage of a space For 120 Balanced interface0V± 0.3V 75 Unbalanced interface0V± 0.237 V Nominal Pulse Width244ns Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 Khz ) Permissible Attenuation6dB at 1 MHz Continued... Digital Interface 2.048 Mbps, E1 Interface VCL-CB, Intelligent E1 Channel Bank

12. Number of Interfaces per card2 Interface Type(s)FXO, FXS and 2W / 4W E&M Maximum Number of Channels30 Transmission performanceFully compliant to ITU (CCITT) G.712 specifications Line Impedance 600 (900 optional) ConnectorRJ-11 Voice Channel Frequency300Hz-3400Hz Insertion Loss-2dB Nominal (User adjustable range of -2dB to -7dB) Idle Channel Noise -65dB Return Loss 300 Hz - 600Hz - 12dB 600Hz - 3400Hz - 15 dB Longitudinal Balance 46dB between 300Hz to 3400Hz Ring frequency detection (FXO)25Hz and 20 Hz Ring voltage detection (FXO) 30 volts RMS Ring voltage (FXS) volts RMS into a load of 5 R.E.N. with a 0.30 Erlang traffic pattern Subscriber Loop Current (FXS) 23mA into a subscriber loop of 1000 Ohms 2 Wire, Analog PSTN Interface - FXO, FXS and E&M Interfaces(s) Confidential Slide 12 Return Loss at: 51.2 Khz to 102.4 KHz>12dB 102.4 Khz to 2048 Khz >18dB 2048KHz to 3072KHz>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 multi frame alignment: As per clause 5.2 of ITU (CCITT) G.732 Copyright, Valiant Communications Limited 2000-2005 VCL-CB, Intelligent E1 Channel Bank

13. Pulse Dialing Speed8-12pps Overload Level+3.14 dBm ± 0.5 dBm Data TransmissionSupports V.34 modems 33.6Kbps (download data transmission rate) Confidential Slide 13 Copyright, Valiant Communications Limited 2000-2005 VCL-CB, Intelligent E1 Channel Bank "U" InterfaceMeets ANSI T1.601-1992 requirements Line Rate160 Kbits/s Frame Format2B as per CCITT Rec.1.430 Line Code2B1Q as per CCITT Rec.G.961 Accepted Line Attenuation42dB at 40 Khz Pulse ShapeAs per CCITT Rec.G.961 Multiplexer EmulationLT Emulation Customer Premises EquipmentNT Emulation Impedance135 Ohms at 40KHz iDSL - ISDN DSL Specifications Distance in Kms. (Miles) Wire Gauge (AWG/mm) Data Rate (Kbps) 12817.4 (10.8) 19 (.9mm) 11.6 (7.2) 22 (.6mm) 8.1 (5.0) 24 (.5mm) 5.5 (3.4) 26 (.4mm) Maximum Distance : 5KM (4 miles) on 0.5 mm twisted Pan. Distance may vary with cable gauge For distance using various cable guages please refer to chart below.

14. Customer Premises Desktop User Interfaces: Customer Premises Desktop Interfaces - Option # 1: (V.35 interface @ 128Kbps) Our CO / ISP side iDSL Modem cards - part # VCL-CB-080 may be used with our V.35, baseband modem - Valiant Part # VCL- CB-090 (customer premises desk top equipment with V.35 Interface @ 128Kbps). Customer Side / Remote / Side Desk-Top Equipment: Provides 128Kbps data transmission rate on a twisted pair upto 5KM from the VCL-CB, Installation Site: Customer Interface - V.35 data interface @ 128Kbps. Power Supply 110VAC-220VAC, 50Hz/60Hz, UL and CE Approved. Ordering Information: Valiant Part # VCL-CB-090 (desk-top customer premises equipment with V.35 interface @ 128Kbps). Optional Accessories: V.35 Data Interface Cable (with male / female M34 connector) Customer Premises Desktop Interfaces - Option # 2: (10BaseT Ethernet - with IP Protocol Routing Functionality) Our CO / ISP side iDSL Modem cards - part # VCL-CB-080 may be used with our customer premises equipment with a 10BaseT Interface. Valiant Part # VCL-CB-095 - customer premises desk top equipment with 10BaseT Interface - IP Protocol Routing Functionality. (Firewall Protection - Optional). Customer Side / Remote / Side Desk-Top Equipment: Provides 128Kbps data transmission rate on a twisted pair upto 5KM from the VCL-CB, Installation Site: Customer Interface - 10BaseT Ethernet Interface with IP Protocol Routing Functionality. The 10BaseT Interface may be directly connected to a 10BaseT Network Interface Card installed on a PC, or to to a HUB to connect a complete customer LAN to the network. Power Supply 110VAC-220VAC, 50Hz/60Hz, UL and CE Approved. Ordering Information: Valiant Part # VCL-CB-095 (desk-top customer premises equipment with 10BaseT interface). VCL-CB, Intelligent E1 Channel Bank Confidential Slide 14 Copyright, Valiant Communications Limited 2000-2005

15. Mechanical Specifications Rack MountingStandard 19 Inch. DIN Rack Height133.33mm. Depth292mm. Width 482mm. Weight7.50 Kg CoolingNatural, Convection cooling Temperature0 o C to 50 o C, Ambient Environmental Input DC voltage-48V DC (nominal) Range of Input -40V to -60V DC Input Voltage Reversal Protection Provided Power Supply Synchronization SourcesInternal Clock or timing derived From the E1 HDB3 link (Loop-Timed) External Clock InputAs per ITU (CCITT) Rec G.703 Default Option Internal Clock Clock Synchronization Confidential Slide 15 Copyright, Valiant Communications Limited 2000-2005 VCL-CB, Intelligent E1 Channel Bank PROTECTION Central Office Terminal and Remote Terminal are protected against power surges and transients occurring from lightning and electric induction as per CCITT Rec. Table I/K-20 towards line side

16. VCL Products Confidential Slide 16 Copyright, Valiant Communications Limited 2000-2005 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) Digital Loop Carrier Remote Asset Management Systems

17. 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