1. MSS Ethernet Networks User Examples Iowa Network Services and Centennial de Puerto Rico Ethernet Network Examples

2. Iowa Network Services (INS) After more than a century of efficient, rural phone service, a challenge presented itself to Independent Telephone Companies (ITCs) and their customers in 1984. With the breakup of AT&T and the Bell companies, most Americans could finally choose between multiple long distance carriers--but not rural residents. The reason for this was the same as it was in the early days of telephone service: it simply wasn't economically feasible for long distance carriers to expand their networks to reach rural customers.

3. INS To solve this dilemma in Iowa, a group of 127 visionary Independent Telephone Companies came together to form Iowa Network Services (INS). In 1989, INS finished work on a state-wide fiber optic network that connected 150 ITCs and their customers to a central hub in Des Moines for Centralized Equal Access. From this central location, major long distance carriers are able to connect cost- effectively with even the smallest communities, giving rural Iowans access to affordable long distance choices.

4. INS INS may have started with Long Distance, but we've added Internet Services, Network Management Services, SS7, Ethernet Services, Voice Over Internet Protocol and Digital Entertainment Television. This network operates through two Iowa switching centers which provide fiber optic access to over 330 Iowa communities and over half a million customers. We also serve as a link for national and international telecommunications networks

5. INS Overall Ethernet Network

6. INS Ethernet Physical Connection CLS CKTID Ethernet Link Connection Spec KR Service Type

7. INS Ethernet Virtual Connection VL Service Type CLS CKTID VLAN Connection Spec

8. INS Video Channel Connection VC Service Type CLS CKTID VLAN Connection Spec

9. INS VPN Network

10. INS IPVPN Virtual Connection VP Service Type CLS CKTID VLAN Connection Spec

11. INS Design Summary Ethernet Technology Module Consistent Connections Specs –Ethernet Link for PC –VLAN Virtual LAN for VC Consistent Circuit Format –CLS for Ethernet PC –CLS for Ethernet VC –CLS for Video Channel Records –CLS for IPVPN

12. INS Design Summary (cont) Product Specific Information –Network Systems Ethernet Video IPVPN VoIP –Service Type / Extension VLAN used for Ethernet VLAN connection VPN- used for IPVPN connection VCH- used for Video Channel connection SVC- used for Switched Virtual connection (SIP) MPEG4 used for MPEG4 Video over Ethernet

13. INS Design Summary (cont) Product Specific Information –Rate Code E_NET used for Ethernet 10/100 GIGE used for Ethernet Gigabit 10G used for Ethernet 10 Gps N/A - universal match for adjustable port rates

14. INS Design Summary (cont) Product Specific Information –Rate Code E_NET used for Ethernet 10/100 GIGE used for Ethernet Gigabit 10G used for Ethernet 10 Gps N/A - universal match for adjustable port rates

15. Centennial Of Puerto Rico Centennial Communications (NASDAQ:CYCL), based in Wall, NJ, is a leading provider of regional wireless and integrated communications services in the United States and the Caribbean with over 1.3 million wireless subscribers and 326,400 access line. The U.S. business owns and operates wireless networks in the Midwest and Southeast covering parts of six states. Centennial’s Caribbean business owns and operates wireless networks in Puerto Rico, and the U.S. Virgin Islands and provides facilities-based integrated voice, data and Internet solutions. The company has 1,500 fiber-optic terrestrial route miles and more than 2,000 buildings connected through fiber. The Caribbean wireless and wire line networks are connected by Centennial’s undersea own fiber optic capacity to the company’s switch in Miami and the NAP of the Americas. Centennial has over 3,000 employees dedicated to providing superior service to our customers.

16. Centennial Of Puerto Rico (cont) In July 2005, we replaced and upgraded our wireless network in Puerto Rico and US Virgin Islands with 100% 3G technology. We are in the process of completing the roll-out of a new wireless high speed data services EV-DO (Evolution Data Optimize) in Puerto Rico. EV-DO will provide a broadband-like wireless data experience with speeds up to 2.4 Mbps. This service is available to more than 70% of the population.

17. Centennial’s Overall Ethernet Network

18. AP/Radio Overall Network

19. Cen Ethernet Physical Connection

20. Cen Backbone for the VLAN

21. Cen VLAN Connection

22. Cen VLAN Connection (cont)

23. Cen Design Summary MPLS Technology Module Connection Specs - Ethernet Link for PC - VLAN Virtual LAN for VC - VLAN Internet Connection for Internet (VC ) Circuit Format - CLF for Ethernet PC - OTS for Ethernet VLAN

24. Cen Design Summary (cont) Product Specific Information –Network Systems Access Network Edge Network AP/Radio Network –Service Type / Extension Between 1M to a GIGE

25. Cen Design Summary (cont) Product Specific Information –Rate Code GIGE used for Ethernet Gigabit From 1M in increments of 5 up to 1GIG for Ethernet Pipe and VLANS N/A - universal match for adjustable port rates