E 1 Automatic Protection Switching Solution 1 1 E

E 1 Automatic Protection Switching Solution (1+1 E 1 Redundancy Switch) 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 Updated : November, 2005 Orion Telecom Networks Inc. 2005 Slide 1

Orion Telecom Networks Inc. BASIC THEORY OF OPERATION E 1 Redundancy Switch is designed to provide 1+1 redundancy support for two typical E 1 links case scenarios: • An independent point-to-point E 1 link between two "E 1 USER PORTS" • TWO groups of E 1 links connected via a higher order multiplexer link. Since each SWITCH Card supports one E 1 link, up to 16 E 1 links, can be supported by an E 1 Redundancy Switch Shelf. Two Systems are required for implementation of the 1+1 redundancy switch solution. One system must house Switch Cards configured as "MASTER" for connection at one end of the E 1 links (say the near end). The other system must house Switch Cards configured as "SLAVE" for connection at the other end of the E 1 links (say the far end). Orion Telecom Networks Inc. 2005 Slide 2

Orion Telecom Networks Inc. FEATURES AND HIGHLIGHTS • • • Provides 1+1 E 1 redundancy link (active+standby) between any two complementing transmission mediums. Provides 1+1 E 1 redundancy support to higher order multiplexers eg. E 2, E 3. System configuration & management interface through "CLI" text based commands. Transport A-bis Interface or E 1’s. Provide 1 + 1 Protection Routing / Path between BSC and BTS. Provide following interfaces at BSC / BTS Over E 1 links: i) E 1 / A-bis Interface. ii) 10 Base. T Ethernet Bridge. iii) RS 232 Async Serial (for site monitoring). iv) NO / NC Relay / Alarm Extensions (Extend alarms originating on dry relay contacts). Continued. . Orion Telecom Networks Inc. 2005 Slide 3

Orion Telecom Networks Inc. Features continued • • • Optional - 128 ms Echo - Cancellation and VQE features at BSC. Maximize mobile operator service availability and network resiliency through VCL-Mega. Connect-Jr. Path - Protection enabled facility These ensure that mission critical voice, data, control and management traffic are properly supported and maintained even during T 1 / E 1 backhaul facility outages. When the working link fails, the protection link becomes active. During normal Operation, VCL-Mega. Connect-Jr sends duplicate traffic across both the working and dedicated protection E 1 / T 1 facilities while continuously maintaining the performance of both links to determine which link shall be utilized. Through the comprehensive digital access cross-connect and remote management capabilities integrated within VCL-Mega. Connect-Jr, backhaul T 1 / E 1 facilities can be optimally groomed to reduce both Capital Expenditure and improve Network reliability. Continued. . Orion Telecom Networks Inc. 2005 Slide 4

Orion Telecom Networks Inc. Features continued • • In the event of a failed or degraded T 1 / E 1 link, the traffic is automatically transfered from the previously working link to the duplicate protection link in accordance with the pre determined operating parameter programmed by the network operator. During normal Operation, VCL-Mega. Connect-Jr APS passes independently traffic across both the working and protection E 1 / T 1 facilities while continuously maintaining the performance of both links to determine which to utilize for critical traffic Traffic Protection Alternate Facility Advantages Service Differentiation Agreements Increased Network Reliability Resilience Media and Path Diversity Remote Management Orion Telecom Networks Inc. 2005 Slide 5

Orion Telecom Networks Inc. BENEFITS • Customer Relation • Competitive • Service Level • Back-haul Network • Technology Migration Orion Telecom Networks Inc. 2005 Slide 6

Orion Telecom Networks Inc. 1) User Programmable 1+1 Protection Parameters: a) b) c) d) e) Loss of Signal Loss of Frame Loss of Multi-Frame AIS Excessive CRC 4 Violation 2) Critical Links / Critical Time-Slots Orion Telecom Networks Inc. 2005 Slide 7

Orion Telecom Networks Inc. Applications Providing 1+1 alternate paths between any two Transmission medium (active+standby). e. g: - • Fiber / Fiber. • Radio / HDSL • Fiber / HDSL etc. Orion Telecom Networks Inc. 2005 Slide 8

Orion Telecom Networks Inc. 2005 Slide 9

Orion Telecom Networks Inc. 2005 Slide 10

Orion Telecom Networks Inc. 2005 Slide 11

Orion Telecom Networks Inc. 2005 Slide 12

Orion Telecom Networks Inc. 2005 Slide 13

Orion Telecom Networks Inc. 2005 Slide 14

Orion Telecom Networks Inc. 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 Orion Telecom Networks Inc. 2005 Slide 15