Overview Designed to connect two or more networks, typically
located in different buildings, wireless bridges deliver high data
rates and superior throughput for data-intensive, line-of-sight
applications. The bridges connect hard-to-wire sites, noncontiguous
floors, satellite offices, school or corporate campus settings,
temporary networks, and warehouses. The high-speed links between
the wireless bridges deliver throughput many times faster than
E1/T1 lines for a fraction of the cost, thus eliminating the need
for expensive leased lines or difficult-to-install fiber-optic
cable. 802.11a
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Bridge Connection
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Bridging Defined Bridges are used to connect two or more wired
LANs, usually located within separate buildings, to create one
large LAN.
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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
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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
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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
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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
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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
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Introduction The BR350 is sometimes called the multifunction
bridge.
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Bridges Cisco bridges can be controlled and configured though
command line and Web interfaces. Management can also be done
through traditional protocols like SNMP.
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Bridge roles in the network The Cisco bridges can be configured
to operate in different modes. The BR350, or multifunction bridge,
has the same receiver sensitivity, power levels, and capabilities,
as the Cisco Aironet APs with.11b radio chips.
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Parent-Child Relationship: Root - Non-Root
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Bridge roles in the network Root Access PointUse this setting
to set up the bridge as a rugged access point connected to the
wired LAN. When you select Access Point, the bridge's Spanning Tree
Protocol (STP) function is disabled. Root Access Point
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Bridge roles in the network Root bridgeOne bridge in each group
of bridges must be set as the root bridge. A root bridge can only
communicate with non-root bridges and other client devices and
cannot associate with another root bridge. Root Bridge
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Bridge roles in the network Non-Root Bridge w/ClientsUse this
setting for non-root bridges that will accept associations from
client devices, and for bridges acting as repeaters. Non-root
bridges can communicate with other non-root bridges, root bridges,
and client devices. Non-Root Bridge with Clients
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Bridge roles in the network Non-Root Bridge w/o ClientsUse this
setting for non-root bridges that should not accept associations
from client devices. A bridge set to Non-Root Bridge w/o Clients
will only communicate with a root or non-root bridge. Non-Root
Bridge without Clients
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Bridge roles in the network Repeater Access PointUse this
setting to set up the bridge as a rugged repeater access point. A
repeater access point is not connected to the wired LAN; it is
placed within radio range of an access point connected to the wired
LAN to extend the range of your infrastructure or to overcome an
obstacle that blocks radio communication. When you select Repeater
Access Point, the bridge's STP function is disabled. Repeater
Access Point
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Power Options
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Distances Limited by 802.11 Specification
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BR350Front Cover LEDs
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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
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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.
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Optional 2.4GHz Antennas for Long Range 13.5 dBi Yagi Distances
over 7.3 miles @ 2 Mbps 3.6 miles @ 11 Mbps 21 dBi Solid Dish For
distances up to 25+ miles @ 2 Mbps 20.5 miles @ 11 Mbps Note:
Distances include 50 feet of low loss cable and 10 dB fade
margin
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802.11b 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
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Lightning
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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
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Direct Strike Protection
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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
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Path Loss Considerations The following are needed to determine
coverage Antenna Gain Transmitter Power Receiver Performance Cable
Losses Environmental Structures
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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
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LED indicators When the bridge is powering on, all three LEDs
normally blink. After bootup, the colors of the LEDs represent the
following: Green LEDs indicate normal activity. Amber LEDs indicate
errors or warnings. Red LEDs mean the unit is not operating
correctly or is being upgraded.
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Connecting to the Bridge There are 3 basic GUI interfaces
depending on the bridge image: IOS 1400 VxWorks BR350 SOS
WGB350
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1400 with IOS GUI
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BR350 with VxWorks GUI
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WGB350 with SOS GUI ad SOS Menu
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Resetting the Bridge Resetting the Cisco bridges depends on the
model. The BR350, can be reset via the console, telnet, or browser
connection. If the password is unknown, then the console reset
method is required. The console port on the BR350. The :resetall
command can be used after rebooting the bridge, however the command
must be entered within 2 minutes of rebooting. The 350 Series
Workgroup Bridge or the 1400 series bridge can be reset to default
values via the Reset button, telnet, or browser connection.
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Basic Configuration Will will not use or discuss all of the
configuration options and features.
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BR350 Home Page (Summary Status)
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BR350 Map Link The Map link opens the Map window, which
contains links to every management page. The Map window can be used
to jump quickly to any system management page, or to a map of the
entire wireless network
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BR350 Network Link
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BR350 Associations Link
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BR350 Setup Link The Setup link displays the Setup page, which
contains links to the management pages with configuration
settings.
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BR350 Logs Link
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BR350 - Basic Configuration Connect just like an AP, suggest
wired GUI. Remember to set the IP address on your Ethernet
NIC.
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Root Bridge and Non-Root Bridges
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Non-Root Bridge without Clients Repeater Bridge
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Bridge as Root Access Point
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Bridge as Repeater Access Point
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Root Radio Identification configuration The current IP subnet
mask displayed under the setting shows the IP subnet mask currently
assigned to the bridge. This is the same subnet mask as the default
subnet mask unless DHCP or BOOTP is enabled. If DHCP or BOOTP is
enabled, this is the subnet mask used by the DHCP or BOOTP server.
You can also enter this setting on the Express Setup page.
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Root Radio Identification Page Primary Port Settings: Two
options allow for the designation of the radio port as the primary
port on the bridge: Primary Port? The primary port determines the
MAC and IP addresses of the bridge. The default primary port of the
bridge is the Ethernet port. The Ethernet port is connected to the
wired LAN, so this setting is usually set to no. Select no to set
the Ethernet port as the primary port. Select yes to set the radio
port as the primary port. Adopt Primary Port Identity? Select yes,
to adopt the primary port MAC and IP addresses for the radio port.
Select no to use different MAC and IP addresses for the radio port.
Bridges acting as root units adopt the primary port settings for
the radio port. When putting a bridge in standby mode, select no
for this setting.
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Root Radio Hardware configuration Similar to an AP.
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Root Radio Hardware configuration
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Ethernet Identification configuration Addressing is similar to
Root Radio options
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Ethernet Hardware configuration
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Configuring time services
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Configuring boot services
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Configuring name services
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Configuring routing services
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Manage Installation Keys is used to read specifications of the
software license and to install a new license. Manage System
Configuration is used to restart the device, download a
configuration file, or reset settings to factory defaults.
Distribute Configuration to other Cisco Devices is used to send the
configuration of the device to other Cisco Aironet devices on the
network. Distribute Firmware to other Cisco Devices is used to send
a new firmware version to other Cisco Aironet devices on the
network.
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CDP
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Distribute Firmware to Other Cisco Devices
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Hot Standby Management
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1400 Series Bridge 801.11a wireless bridge
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Overview The Cisco Aironet 1400 Series Wireless Bridge is a
high-performance 801.11a wireless bridge designed to connect
multiple LANs in a metropolitan area. Designed to be a
cost-effective alternative to leased lines, it is engineered
specifically for harsh outdoor environments. The features of the
1400 include:
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Overview Support for both point-to-point or point-to-multipoint
configurations Support data rates up to 54 Mbps Enhanced security
mechanisms based on 802.11i standards Rugged enclosure optimized
for harsh outdoor environments with extended operating temperature
range Integrated or optional external antennas for flexibility in
deployment
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Overview Data rates of 54 Mbps can be enabled for
point-to-point links up to 7.5 miles, and for point-to-multipoint
links up to 2 miles. Aggregate throughput can be obtained in excess
of 28 Mbps. Also, by using higher gain antennas or lower data
rates, ranges in excess of 20 miles point-to-point can be
covered.
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Models and options There are two options for ordering the Cisco
Aironet 1400 Series Wireless Bridge: Cisco Aironet 1410 Wireless
Bridge with 22.5 dBi Antenna, FCC Config Cisco Aironet 1410
Wireless Bridge with N-Type Connector, FCC Config
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Models and options
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Components and accessories Cisco Aironet Power Injector
Mounting Kit
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IOS features
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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.
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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)