1. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-1 111 © 2003, Cisco Systems, Inc. All rights reserved.

2. FWL 1.0—6-2 Module 6 Bridges

3. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-3 Overview This chapter discusses wireless bridges as a means of connecting LANs. Bridges are used to connect two or more wired LANs to create one large LAN.

4. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-4 Learning Objectives Determine the feasibility of installing a wireless bridge link. Explain why a wireless bridge may be a better solution than other alternatives. Determine the maximum distance that can be achieved using wireless bridges with given antennas and extension cables. Identify steps necessary to protect a wireless bridge installation against a lightning strike.

5. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-5 Key terms Root bridge Non-Root bridge with clients Non-Root bridge without clients Repeater AP Root AP Site-Survey client Installation mode

6. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-6 Bridge Connection

7. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-7 Bridging Defined Bridges are used to connect two or more wired LAN’s, usually located within separate buildings, to create one large LAN.

8. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-8 Technology Comparisons Technology Recurring Cost Installation Cost Monthly Cost (USD) Dialup or 56K $25 to $50 $0 to $250 Barriers to Implement Remote locations Cable/DSL $0 to $250+ $25 to $150 E1, T1 Reliability Fiber Physical obstructions $250 to $1,000+ $400 to $1000+ Availability $5,000 to $200,000+ $0 Microwave Licensing, Weather $15,000+ $0 802.11 $2,000 to $15,000 $0 Interference

9. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-9 Emerging Markets — Bridging

10. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-10 Monthly Leased Line OpEx 2 DS1: $600 1 DS3: $5000 TOTAL: $5600 RBOC provides guaranteed level of service via a Service Level Agreement (SLA) RBOC DS3 DS1 New remote office - No DS1 connection available Traditional WAN Connectivity

11. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-11 Monthly Line Cost 2 DS1: $600 1 Fractional DS3: $3000 TOTAL: $3600 Wireless Installation Cost 7 350 Series Bridges Installed: $12,500 USD Pay Back Period: 3 months New building connected Self managed RBOC 22 Mbps 2 Mbps 5 Mbps 802.11b Connectivity

12. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-12 Monthly Line Cost 2 DS1: $600 1 DS3: $5000 TOTAL: $5600 Wireless Installation Cost 7 1400 Series Bridges Installed: $40,000 USD Pay Back Period: 8 months New building connected Self managed RBOC 50 Mbps 14 Mbps 27 Mbps 802.11a Connectivity

13. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-13 Role in Radio Network Determines functionality within WLAN Determines which type of clients will be supported File Server Bridge Access Point PC Card PCI Card Workgroup Bridge Bridge

14. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-14 Parent – Child Relationship (Root Bridge vs. Non-Root Bridge)

15. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-15 Root Mode: Access Point vs. Bridge

16. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-16 Root Bridge

17. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-17 Non-Root Bridge with Clients

18. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-18 Non-Root Bridge without Clients

19. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-19 Bridge Configured as a Root Access Point

20. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-20 Bridge Configured as a Repeater Access Point

21. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-21 Bridge Configured as a Site Survey Client

22. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-22 Distances Limited by 802.11 Specification

23. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-23 Connecting the 350 Bridge ss

24. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-24 BR350—Front Cover LED’s

25. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-25 802.11b Bridge Bridge Model BR350 Note: Distances over 25 miles or 40 Km are very hard to align and install! Data Rate 11 Mbps 51.7 83.2 20.5 33.0 32.7 52.5 32.6 52.4 21 dBi Dish 41.0 66.0 2 Mbps 5.5 Mbps Max. Distance Miles Km Max. Distance Miles Km Optional Antenna Standard Cable (6.7 dB/100 ft. loss) (6.7 dB/30.5 m) Standard Cable (6.7 dB/100 ft. loss) (6.7 dB/30.5 m) 1 Mbps 21 dBi Dish 50 ft (15.2m)/side 20 ft (6.1m)/side 50 ft (15.2m)/side

26. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-26 802.11b Common Questions Cisco Aironet Bridge How Fast? Max data rate 20.5 Miles 33 Km 11 Mbps 5.5 Mbps 3.6 Miles 5.8 Km How Far? Typical throughput Yagi antenna 2 Mbps 1.4 Mbps 7.3 miles 11.7 Km 25+ miles 40+ Km Dish antenna Note: All distances may be limited by governing bodies and standards.

27. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-27 Optional 2.4GHz Antennas for Long Range 13.5 dBi Yagi Distances over 7.3 miles @ 2 Mbps 11.7 Km @ 2 Mbps 3.6 miles @ 11 Mbps 5.8 Km @ 11 Mbps 21 dBi Solid Dish For distances up to 25+ miles @ 2 Mbps 40+ Km @ 2 Mbps 20.5 miles @ 11 Mbps 33 Km @ 11 Mbps Note: Distances include 50 feet of low loss cable and 10 dB fade margin

28. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-28 11b Bridge Application: School District Lincoln Elementary Yagi Bode Elementary Yagi Richardson Elementary Yagi Price Elementary Yagi Dewitt Elementary Yagi Bolich Middle School Yagi Roberts Middle School Dish Weaver- Special Education Dish High School 2 Bridges One 12 dBi omni One Dish Administration 2 Bridges One 12 dBi omni One Yagi Channel #11 Channel #6 Channel #1

29. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-29 Lightning

30. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-30 Lightning Arrestor Designed to protect LAN devices from static electricity and lightning surges that travel on coax transmission lines RP-TNC connectors used on all Cisco Antennas To Antenna Ground Wire From RF Device Lug Lockwasher Nut

31. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-31 Direct Strike Protection

32. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-32 Coax Connection Sealing Number one problems with bridges - water in the connectors Proper sealing is important Coax Seal is one product that is inexpensive and works great

33. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-33 Path Loss Considerations The following are needed to determine coverage · Antenna Gain · Transmitter Power · Receiver Performance · Cable Losses · Environmental Structures

34. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-34 Calculations of Coverage Performance Coax Length 150 ft (45.7)? Coax Length 100 ft (30.5 m)? Wants 11 Mbps data rate Distance = 13 miles (20.9 Km) Towers needed to clear trees and other buildings

35. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-35 Bridge Range Calculation Utility

36. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-36 Bridge Distance Calculations (cont.)

37. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-37 Bridge Distance Calculations (cont.)

38. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-38 1400 Series Bridge

39. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-39 1400 Series High Performance Up to 54Mbps throughput Outdoor Only Flexible Point to point and point to multi-point bridging Multiple mounting and antenna options Secure Enterprise-class security Feature Rich Intelligent Network Services via IOS AIR-BR1410A-A-K9 AIR-BR1410A-A-K9-N

40. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-40 1400 Modes Root Non-Root Install-Mode

41. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-41 Power Injector LR Converts standard 10/100 baseT Ethernet RJ-45 interface to F-Type connector dual coaxial cable Power provided over dual coaxial cable with power discovery to protect other appliances Support for longer cable runs by resetting the 100 meter, 100baseT Ethernet timer, enabling total cable runs of 200 meters. Surge protection provided at the F- Type connectors to protect infrastructure devices

42. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-42 802.11a Bridge Bridge Model 1400 Note: Distances over 25 miles or 40 Km are very hard to align and install! Data Rate 54 Mbps 9 Mbps 12 xx.0 23 xx 7.5 xx 28 dBi Dish 9 xx 16 Mbps 54 Mbps Max. Distance Miles Km Max. Distance Miles Km Optional Antenna 28 dBi Dish 22 dBi Int.

43. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-43 Optional 5GHz Antennas for Long Range Network configurations Point to point Point to multi-point Roof, pole, and wall mounting options 5.8 GHz Unlicensed Band Operation Rapid deployment and re- commissioning Operating temp range: -30 to +55 o C Humidity: 0 to 100% 9 dBi omni (Vertical polarization) 9.5 dBi sector (H or V polarization) 28 dBi dish (H or V polarization)

44. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—6-44 Summary Identify characteristics of Cisco Aironet 802.11a products. Identify characteristics of Cisco Aironet 802.11b products.

45. 45 © 2003, Cisco Systems, Inc. All rights reserved.