1. Slide 1Comarra Limited - 2006Slide 1 VCL E3, 2/34 PDH Multiplexer Slide 1Comarra Limited - 2006Slide 1 COMARRA Telecom Transmission Solutions VCL - 2/34 Mbps Multiplexer E3, PDH Multiplexer Updated : March 2006 VCL E3, 2/34 PDH Multiplexer

2. Slide 2Comarra Limited - 2006Slide 2 VCL E3, 2/34 PDH Multiplexer Single - card implementation Plug and Play Modular 2Mbps transmission units Stored program controlled Highly reliable and compact Standard CCITT (ITU-T) compliant interfaces Monitoring and control by CLI (Command Line Interface) TCP/IP Remote Access for monitoring alarms and management Extensive alarms and status indication facility Service bit monitoring and insertion Operates on nominal -48V DC input Distributed on-board power supply Microprocessor controlled with powerful diagnostic facilities for both remote and local systems Local and remote loopback facility for 34Mbps stream Features & highlights

3. Slide 3Comarra Limited - 2006Slide 3 VCL E3, 2/34 PDH Multiplexer The front panel LEDs provide the following indications: L1-E3 LOS L2- E3 Sync / Alarm L3- E3 BER L4- E3 CLK FAULT L5- E3 REMOTE ALARM L6- E3 AIS ALARM RJ-45"LAN Port L7- E3 TX FAULT L8- E1 LOS L9- ST ERROR L10-"LAN ON L11- Positive 5V present L12- Negative 48V input present SW1"LAN ON / OFF" Toggle Switch. SW2 LAN Reset Switch Front Panel View of VCL-E3 Multiplexer

4. Slide 4Comarra Limited - 2006Slide 4 VCL E3, 2/34 PDH Multiplexer VCL-E3 Multiplexer Applications 1

5. Slide 5Comarra Limited - 2006Slide 5 VCL E3, 2/34 PDH Multiplexer VCL-E3 Multiplexer Applications 2

6. Slide 6Comarra Limited - 2006Slide 6 VCL E3, 2/34 PDH Multiplexer VCL-E3 Multiplexer Applications 3

7. Slide 7Comarra Limited - 2006Slide 7 VCL E3, 2/34 PDH Multiplexer Front View of Shelf

8. Slide 8Comarra Limited - 2006Slide 8 VCL E3, 2/34 PDH Multiplexer Back Panel of E3, 2/34Mbps Multiplexer RJ-45 Version

9. Slide 9Comarra Limited - 2006Slide 9 VCL E3, 2/34 PDH Multiplexer Number1 Nominal bit rate34368kbps Bit rate tolerance± 20ppm Line codeHDB3 Frame structureas per G.751 Interfacesas per G.703 ConnectivityBNC connector (75 Ohms) Cable75 unbalanced Permissible attenuation12dB at 17184 Khz 34Mbps, third order Interface Continue.. Technical Specifications

10. Slide 10Comarra Limited - 2006Slide 10 VCL E3, 2/34 PDH Multiplexer Number16 Nominal bit rate2048kbps Bit rate tolerance ±50ppm Line codeHDB3 Frame structureas per G.704 Interfacesas per G.703 ConnectivityRJ-45 Female Connector (120 Ohms) Cable120 balanced Permissible attenuation6dB at 1024 kHz Power Consumption: Power Consumption7.20 Watt 2Mbps primary rate interface Technical Specifications

11. Slide 11Comarra Limited - 2006Slide 11 VCL E3, 2/34 PDH Multiplexer NMS (with Telnet) xPort Specifications Network InterfaceRJ-45 Ethernet 10BaseT or 100BaseT-TX (auto sensing) CompatibilityEthernet Version 2.0 IEEE802.3 Protocols SupportedARP, UDP / IP, TCP / IP, Telnet, ICMP, SNMP, DHCP, BOOTP, TFTP, Auto IP, SMTP and HTTP LEDs10Base-T & 100Base-TX Activity, Full / half duplex. ManagementInternal web server, SNMP (read only), Serial login, Telnet login EMI ComplianceRadiated & conducted emissions - complies with Class B limits of EN 55022:1998 Direct & Indirect ESD - complies with EN55024:1998 RF Electromagnetic Field Immunity - complies with EN 55024:1998 Electrical Fast Transient/Burst Immunity - complies with EN55024:1998 Power Frequency Magnetic Field Immunity - complies with EN55024:1998 RF Common Mode Conducted Susceptibility - complies with EN55024:1998 Technical Specifications

12. Slide 12Comarra Limited - 2006Slide 12 VCL E3, 2/34 PDH Multiplexer Alarm Status Monitoring Loss of incoming signal at all 2Mbps ports Loss of incoming signal at 34Mbps port Loss of frame alignment at 34Mbps Remote Alarm at 34Mbps AIS at 34Mbps Excessive Error Rate at 34Mbps Status of audible alarm Programming & Monitoring

13. Slide 13Comarra Limited - 2006Slide 13 VCL E3, 2/34 PDH Multiplexer Programming & Monitoring Status Monitoring Priority sequence of clock selection and current clock on which the system is working Status of alarm Presence or absence of loop-back on 34Mbps and 2Mbps streams Enabled / disabled status of 2Mbps channels Monitoring healthy / unhealthy state of micro controller and 2Mbps line interface units

14. Slide 14Comarra Limited - 2006Slide 14 VCL E3, 2/34 PDH Multiplexer Programming Features Setting loopbacks on 2Mbps or 34Mbps Enabling or disabling 2Mbps channels Initiating self tests Alarm acknowledgment option Programming & Monitoring

15. Slide 15Comarra Limited - 2006Slide 15 VCL E3, 2/34 PDH Multiplexer Status Monitoring Loss of signal at 2Mbps Loss of signal at 34Mbps Loss of frame alignment at 34Mbps Remote Alarm at 34Mbps AIS at 34Mbps Excessive Error Rate at 34Mbps +5V failure -48V input failure Processor unhealthy alarm Prompt Maintenance alarm Programming & Monitoring

16. Slide 16Comarra Limited - 2006Slide 16 VCL E3, 2/34 PDH Multiplexer Digital Access Cross Connects - E1 / T1, E3, DS3, 10/100 BaseT Ethernet Groomers (Hi-Z Non-intrusive Hi-Impedance Monitoring) Echo Canceller & Voice Quality Enhancement Solutions - E1, T1, DS3 and STM-1 E1 Drop-Insert (Add-Drop) Voice and Data Multiplexers 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 VoIP SS7 and C7 Solutions Nextone Softwitch CISCO Gateways Quintum Tenor VOIP Gateways Networking & Engineering Solutions. Hosted Solutions. Comarras Products

17. Slide 17Comarra Limited - 2006Slide 17 VCL E3, 2/34 PDH Multiplexer Thank you for your attention For more details visit us at our Website at http://www.comarra.co.uk 123 Springvale Road, Winchester Hants SO23 7LE UK Phone: +44 (0) 20 7871 9524 E-mail: info@comarra.co.uk Web Site: http://www.comarra.co.ukinfo@comarra.co.ukhttp://www.comarra.co.uk