typical school network devices - broward.k12.fl.us · • network loops –both ends of a network...

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Overview of School Network Devices

Typical School Network Devices

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Network Operations Center


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• To check to see if you have a switch down on your campus,

type in a web browser;

– http://slaweb/index.php/outages/

• If you have a switch down, you’ll see a device under the

“Switch” list that starts with your 3-letter ship-to, followed by

the room number (communications closet) where that switch

is located.

AT&T WAN (Internet) Devices

US Robotics v.92 Modem – Used to connect to the router when the internet is down.

The 4 red LEDs indicate the modem is working properly. (AA, CD, TR, and CS)

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Cisco 1841 Router

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AT&T WAN (Internet) DevicesCisco 7301 Router


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AT&T WAN (Internet) Devices• Fiber Connection Box – Canoga Perkins

• Connects directly to AT&T Router via an

Ethernet patch cable

• Usually mounted flat on the wall behind

the main communications rack

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• Another type of fiber connections box – Edge Access

Cisco Switches

3500 and 3550 Series switches “Stackables”

These are edge switches with 10/100Mb port for computers, and gigabit uplink

ports to connect to the backbone switch and/or other edge switches. Single

power cord in the back, no On or Off button.

12-port model with fiber GBIC and Gigastack GBIC

48-port model

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Cisco Switches

Gigastacks

Gigastack gbics connect stacks of Cisco switches together at gigabit speeds.

Each connected switch has a gigastack gbic with one yellow cable connecting

the switch above it and another yellow cable below it.

Cisco SwitchesFiber and RJ45 “Copper” GBICs

Fiber and Copper GBICs provide gigabit uplink capability. Fiber GBICs connect

remote closet switches to the backbone switch. RJ45 GBICs provide

connectivity to other switches that may have built-in gigabit RJ45 ports, and

also gigabit servers in some cases.

RJ45 FIBER

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Cisco Switches

Core (“Backbone”) Switches

Core switches act as the backbone of your network; all remote switches in other communication closets connect to this switch in one way or another. These switches can have 10/100/1000Mb ports depending on the modules installed. Common core switch models are the Cisco Catalyst 6506, 4006, and 4003.

If possible, it is preferred that most school routers and servers are plugged into the core switch. These core switches have gigabit capable RJ45 ports.

Note that if these switches were to go down or go offline, your entire site will likely lose network connectivity.

Cisco SwitchesCisco Core Switch Examples

Cisco 6500 Cisco 4006

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HP SwitchesHP model switches can be modular or have a fixed amount of ports.

Depending on the model and module type, port speeds can be 10/100, or

10/100/1000, and can also provide POE for phones and access points.

Seen below on the left is a 5400 (used as a core network switch and also as an

edge switch), and on the right a 3500yl.

HP SwitchesFault indicators

All HP switches (with the exception on the 9300 models) have FAULT LEDs in the

upper left corner of the device.

When operating normally, the green POWER LED will be solid green.

A blinking FAULT LED usually indicates a bad fan or bad port – another LED will

blink at the same time as the FAULT LED to indicate what the problem is.

A solid FAULT LED indicates a more serious hardware or software error on the

switch.

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HP SwitchesHP 9300 Core Switch

HP 9300 model core network switch. Shown below is a 4 module

model, also in the schools are 8 module models. Power is in the

front of these devices, no on/off switch or button. Green LEDs

indicate the power supplies are on and receiving power.

HP SwitchesHP switch in a school’s main communications closet.

Core network

switch with

fiber uplinks

Wireless

controller

AT&T WAN

(Internet) Router

AT&T modem

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HP SwitchesRemote communications closet

Cisco Wireless

All Access Points at a school are controlled by a WLAN Controller located at that

campus. Power cords for WLAN Controllers are in the back, no on/off button.

WLAN Controllers are uplinked to the core network switch.

Models include 4400 (shown below), 4000, and 4100 series. Depending on how

many access points are at a campus, a site may have more then one WLAN

Controller.

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Cisco WirelessCisco 4101 WLAN Controller

Access Points

Cisco 1020

LED indicators

Normal operation

Power LED = Green

Alarm = OFF

2.4 Ghz = Amber

5.0 Ghz = Red

All LED’s blinking at once = Software is

downloading, do not unplug.

All LEDs are scrolling back and forth indicate no

network connection, or the AP cannot find the

WLAN Controller.

Solid Red Alarm LED indicates a possible faulty

access point

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Access Points

Cisco 1142 Cisco 1131

Green LED indicates the AP is operational, with no clients

associated.

Blue LED indicates the AP is operational, and has clients

currently associated.

Access Points

Cisco 1252

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Common Causes for Network Related Problems

• Power related – Network devices not plugged into a UPS, or the UPS it is plugged

into has a bad battery. Power going on and off rapidly could lead to hardware

failure of network devices if left un-protected.

• Network Loops – Both ends of a network cable plugged into a network switch. This

could be in the communications closet itself or in a classroom.

• Rogue Network Devices – Home routers, hubs, and non-district approved access

points (Apple Airport, Linksys, D-Link) brought on campus may not be cabled

correctly, causing network loops, and could also give out incorrect DHCP addresses.

• Client Drivers – Updating the network driver or software on a client, especially for

wireless adapters, can resolve many connectivity problems.

• Keep critical servers or devices plugged into core network switches (on gigabit

ports) where possible. If located in a remote closet, make sure it’s plugged into the

switch that has the fiber uplink.

• Green cables are generally for uplinks for critical devices, and sometimes yellow

and blue are used for router uplinks, these connections should not be moved.

To report a network related problem, please contact the

ETS Service Desk at (754) 321-0411.

If you have any further questions or suggestions about

this presentation, please contact me!

Michael Luzadder

JDL Technologies

SBBC Network Operations Center

[email protected]

typical school network devices - broward.k12.fl.us · • network loops –both ends of a network...

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