Black Box NET-ADVISOR Bedienungsanleitung

with the default Log time of 12 minutes (1 minute per division).

To begin the Log measurement, follow the procedure detailed

in the Traffic Mode section for attaching the instrument to the

cable, ensure that “LOCK" appears next to the elapsed time

display and press Enter. The Net-Advisor immediately begins

to build a histogram of the traffic levels.

The Log bar

graphs display the

average traffic

(“AV” bar graph in

the Traffic Mode)

and are scaled to

the currently selected maximum range with a default value of

10%. The bar graphs are updated with every one second

measurement until time for the division is complete. When a

division is complete, the bar graph for the current division is

frozen and the instrument begins displaying the bar graph for

the next division. The Net-Advisor freezes the data by

automatically setting “HOLD” when all the divisions are complete.

Pressing Log will also create the “HOLD” condition. Pressing

Log after “HOLD” appears will clear the display and reset the

Net-Advisor for another Log measurement. All other buttons

(except “ON”) are active only when the Log Mode is in this reset

state.

The Net-Advisor can be left running even after the Log time

has been completed without affecting the recorded data. For

Log durations of three hours or more, it is recommended that

the AC Adapter is used.

CONTROL SETTINGSCONTROL SETTINGS

CONTROL SETTINGS

Audio/LED ContrAudio/LED Contr

Audio/LED Controlol

olol

From the Traffic screen

(in initial or reset state),

Audio or LED settings are

entered by pressing the

corresponding button. Once

in Audio or LED the settings

change when the scroll

button is pressed. Press

Enter to exit the screen.

I N T R O D U C T I O N

Theory of Operation

Computer networks communicate by transmitting

and receiving information in the form of digital

signals. This information is electrically represented

by pulses of energy transmitted by a physical media

which is typically a metallic cable. Each pulse

travelling along a metallic cable creates an

electromagnetic field around the cable proportional

to the amplitude or strength of the pulse. These

radiated or “leaked” signals are sometimes referred

to as Electromagnetic Interference or EMI. Modern

cables use different techniques to reduce the amount

of leakage such as shielding or field cancellation by

tightly twisting the wires together. These techniques

dramatically reduce but can not eliminate the signal

leakage through the cable.

The Net-Advisor is an ultra-sensitive receiver tuned

to the different network frequencies that is able to

detect and measure the leaked signals from the

digital bits of data that are travelling through the

cable. The Net-Advisor makes continuous

measurements of these network signals which are

displayed and updated once per second. The

measured data is displayed as a percentage of total

bandwidth. For example, on an Ethernet system

(10baseT, 2 or 5) the maximum bandwidth is 10

million bits per second (Mbps). If during a one

second measurement, the Net-Advisor detects one

million data bits the display will show a reading of

10% utilization. The various features provided by

the Net-Advisor are based on this continuous

detection, measurement and display of the leaked

data bits.

The Net-Advisor reads all of the traffic on a

segment or dedicated port. It does not filter for traffic

on a single node or address. Traffic can be monitored

from any point on a network that is not isolated from

the rest of the network.

OPERAOPERA

OPERATING MODESTING MODES

TING MODESTING MODES

TING MODES

Press ON to activate the Net-Advisor. When the unit is turned

on it presents a Net-Advisor start up screen for 2.5 seconds and

automatically transitions to the Traffic screen which is the master

screen that is returned to from all other functions.

TRAFFICTRAFFIC

TRAFFIC

The Traffic Mode

starts with the

default conditions of

10 Mbps Ethernet

running on UTP

cable (10baseT). If

the network to be tested is another configuration, go to the Setup

screen to select the appropriate parameters (see Control

Settings). To begin taking measurements push forward the Slide

Button on the right hand side of the instrument to open the

cableport, place the selected cable in the port and release the

slide button to close.

The Net-Advisor

immediately begins

to sense for signals

and if any are

present it will display

the word “LOCK”

next to the elapsed time field. This shows that there is adequate

leaked signal to make the measurement. Note: The strength of

the leaked signals varies along the length of the cable. It is

possible to find very small sections of a cable, typically 1 to 2

inches, where leakage is very low and “LOCK” appears

intermittently or not at all. With the cable in the port, slide the

cable a few inches in either direction until “LOCK” appears

consistently or you have confirmed that no signals are present.

Once “LOCK”

appears, press

Enter to start the

measurement and

display process.

Pressing Traffic a

second time stops the process, freezes the recorded data and

presents the word “HOLD” in the display. Pressing Traffic again

resets the Net-Advisor to make another traffic reading. All other

buttons (except "ON") are active only when the Traffic Mode is

in this reset state.

Collision Index (CI ) - Is based on the calculated probability

of collisions occurring on the segment being tested. This

probability applies to Ethernet shared segments with "1"

indicating a very low probability and "5" indicating a very high

probability of collisions occurring. CI is calculated from Average

Traffic and continuous readings of "4" or "5" indicate system

upgrade should be considered. An arrowhead displayed in this

field means that a higher Max Range should be used.

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IN - Instantaneous display of the network traffic

for the previous one second.

AV - The average of all the one second traffic

measurements since Enter was pressed.

PK - The peak traffic level recorded in any one

second measurement period.

Note: When the Net-Advisor is first powered on, the full scale

default setting is 10%. The 10% setting gives a full scale dis-

play of 1 Mbps for Ethernet. The Net-Advisor is configured in

this manner because Ethernet network traffic levels are typi-

cally below 50% and this setting improves display resolution of

the bar graphs in the Traffic Screen. To set full scale to any

other value go to the Setup Screen and make the selection -

see Setup below.

A Digital display for-

mat for Traffic is se-

lected in Setup

through the Max

Range field by

choosing "DD%".

LOGOG

OGOG

The Log Mode records network activity or bandwidth

utilization over time.

Log has seven

settings from 12

minutes to 24 hours

(see Setup below)

LEDLED

LED

LEDs are used

when viewing the

instrument at a

distance. The

Net-Advisor is

designed so that

the LEDs can be viewed even when it is laid flat. LEDs display

the Instantaneous traffic (“IN” bar graph in the Traffic Mode)

with each LED representing 10% of the full scale bandwidth.

AUDIOUDIO

UDIOUDIO

UDIO

Audio is used

to alert the user

when network

utilization has

exceeded the

selected level.

The Audio tone is tied to the Instantaneous traffic (“IN” bar graph

in the Traffic Mode) and is generated once during each one

second measurement if the threshold level has been exceeded.

Audio has 11 threshold settings beginning with “On” and

increasing in 10% increments to 100%. The default setting is

“On” which will cause the tone to be generated when traffic is

detected during the measurement period.

SETUPSETUP

SETUP

Setup has six

selectable fields

with the active

field being

indicated by the

arrowhead in

the center column of the screen.

Network Type. When entering the Setup screen, the first field

shows that the Net-Advisor is for use with Ethernet (10BaseT) .

Cable Type. The default setting for Cable Type is Unshielded

Twisted Pair (Category 3, 4 or 5) and is indicated by the reversed

out “UTP”. Press Scroll to advance to “STP” (Shielded Twisted

Pair) and then “COAX” for coaxial/thinnet/10base2 cables.

BAA

ATTERTTER

TTERTTER

TTERYY

The Net-Advisor operates on two AAsize batteries. To remove

the battery cover located at the bottom of the unit, press down

on the battery cover end with dimples with the right thumb. This

relieves the pressure on the battery cover latches. While pressing

down with the right thumb, slide

the cover horizontally (away

from your body). The cover will

move approximately one

quarter of an inch and separate

from the unit.

Add or replace batteries as

shown. Check that the cover

orientation is correct by

ensuring that the AC adapter

hole in the cover is aligned with

the adapter jack pin inside the

Net-Advisor.

BOBO

BOX CONTENTSX CONTENTS

X CONTENTSX CONTENTS

X CONTENTS

Net-Advisor Basic RS

Data Clamp 1 1

AC Adaptor 1 1

Carrying Case 1 1

User's Guide 1 1

RS-232 Cable 1

Sotware Diskettes 2

AA Alkaline Batteries 2 2

Press Enter to store the Cable Type setting and advance to the

next field.

Log Time. The duration of time that the network activity is

recorded in the Log Mode is set in this field. The default setting

is 12 minutes (1 minute per division) and has 7 selections up to

24 hours (2 hours per division). Press Scroll to change the Log

Time interval. Press Enter to store the Log Time setting and

advance to the next field.

Custom. The Custom field allows users to set the detection

level for cables that deviate from the standard settings. Many

factors affect the amount of signal leakage from a cable. The

settings used by the Net-Advisor in the Cable Type field are

based on extensive tests with different cables from different

manufacturers. The Net-Advisor should be initially checked on

a known good node or segment cable to verify that the settings

are appropriate for that cable type. The instrument has 19 levels

that are changed by pressing Scroll. The setting of 1 is the

most sensitive and the setting of 19 is the least sensitive.

Settings should not have to be changed in value by more than 1

or 2 from the default value for that cable type. Press Enter to

store the Custom setting and advance to the next field.

Maximum Range. Full scale range is set in this field. The

settings are 1%, 10% (default setting), 50%, 100% and DD%.

DD setting selects a Digital Display format for the Traffic mode

with a fixed full scale range of 100%. Press Scroll to change

the setting. The 1% setting is used when very low traffic levels

are expected. Press Enter to store the Maximum Range setting

and advance to the next field.

Alert Level. This field is used to set the threshold level for

generating the Audio alert. The default setting is “ON” which

will produce a tone if traffic is detected during each one second

measurement interval. The setting is changed in 10%

increments by pressing Scroll. Press Enter to store the Alert

Level setting and exit the Setup screen. The instrument is now

set to the new selections and automatically returns the user to

the Traffic or Log Screen.

Exit Setup. Press Enter 5 times (once for each field) to exit

Setup and return to the Traffic or Log Screen. Settings

automatically return to the default settings when the instrument

is powered on.

AC Adapter. An AC adapter is included with the Net-Advisor

for making long duration measurements or extending internal

battery life. The batteries can be left in or removed when the

adapter is used. Warning: Use only the AC adapter provided

with the unit or call the manufacturer for specifications for a

suitable replacement.

The Net-Advisor will operate for approximately 6 to 8 hours

of continuous use on two AA size alkaline batteries. Battery life

decreases when LED and Audio features are active.

RS-232 OperRS-232 Oper

RS-232 Operaa

ation (Net-Adtion (Net-Ad

tion (Net-Adtion (Net-Ad

tion (Net-Advisor RS Only)visor RS Only)

visor RS Only)visor RS Only)

visor RS Only)

The Net-Advisor RS features an RS-232 interface for

downloading traffic measurements to a host computer in an

ASCII, comma separated variable format. The Net-Advisor

utility software graphically displays downloaded data (see

Readme file on diskette). Windows Terminal and Excel are

also compatible with this data format.

Single Download - After collecting data, press Log or

Traffic to “Hold” the data (“HOLD” is shown in the top center

of the display). Start the application software on the host

computer and connect the RS-232 cable from the Net-Advisor

to the selected COM port. Setup information and recorded

data is downloaded each time Enter is pressed.

Continuous Download - Connect the Net-Advisor to the

selected COM port with the provided RS-232 cable. Each

time the unit is powered On or Setup has been selected the

Net-Advisor configuration is downloaded. Press Enter from

either the Log or Traffic Modes to start data transfer with a

one second update rate. With Log or Traffic in “Hold”, press

Enter to download the last setup and recorded data.

Automatic Power Down

When the Net-Advisor is left in a mode other than Traffic/

Log measurement (time running) or Traffic/Log "Hold", the

unit automatically powers down after 10 minutes to extend

battery life.

Troubleshooting the Net-AdvisorTroubleshooting the Net-Advisor

Troubleshooting the Net-Advisor

If the screen is blank, freezes or shows only a partial

stripe across the top of the display, this means the batteries

are installed backwards or need to be changed. Remove

the battery cover, check for proper orientation of the batteries

and slide the cover back on. The unit will now reset on

power up clearing any invalid state. If the screen is still

frozen or only shows a partial stripe, install new batteries.

This product does not contain any user serviceable parts

internal to the case. Opening of the factory sealed case, other

than to replace the batteries, will invalidate the warranty. Contact

HARRIS CORPORATION Dracon Division or your dealer for

warranty and post warranty repairs.

SAFETYSAFETY

SAFETY

The Net-Advisor is designed for use only with computer

network data cables. At no time should the unit be used on any

other type of cable including power cables.

EXAMPLES OFEXAMPLES OF

EXAMPLES OF

MANMAN

MANAA

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USING THE Net-AdUSING THE Net-Ad

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visor

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oubleshootingleshooting

leshootingleshooting

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The Traffic Mode of the Net-Advisor quickly alerts the user if

there are any signals passing through the cable or if there are

too many signals passing through the cable. This mode provides

rapid isolation of network problems.

Bandwidth ManaBandwidth Mana

Bandwidth Managg

gementement

ementement

ement

The Log Mode is used to measure and record bandwidth

utilization. The histogram of utilization versus time provides the

basis for maintaining or reconfiguring the network. Traffic levels

consistently above 30% of the network rated bandwidth should

be considered for upgrading.

Improper Grounding for Coaxial CablingImproper Grounding for Coaxial Cabling

Improper Grounding for Coaxial Cabling

SystemsSystems

Systems

Coaxial cables that are not grounded in accordance with

the IEEE 802.3 standard may carry high levels of interfering

signals on the cable shield. This condition can allow coupling

of unwanted signals (noise) on to the network causing erratic

network operation and reduced system performance. Because

these noise signals are strong, the Net-Advisor reads and

displays this in-band noise as if it were traffic. Noise can be

identified on the Net-Advisor as all three of the Traffic bar graphs

will register 80% - 100% utilization.

Intermittent CaIntermittent Ca

Intermittent Cabb

ble or Connectorle or Connector

le or Connectorle or Connector

le or Connector

Intermittent conditions can be detected with a Net-Advisor by

attaching the instrument to the cable and using the Traffic Mode.

An intermittent connection can be seen by moving the cable to

different positions and watching for the “IN” bar to show no traffic

with the cable in some positions and regular traffic levels in other

positions.

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cessivcessiv

cessive Jae Ja

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bber/Brber/Br

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ber/Broadcast Stormsoadcast Storms

oadcast Stormsoadcast Storms

oadcast Storms

Isolating a node transmitting excessive traffic is accomplished

by using the Net-Advisor in the Traffic Mode. Attach the

instrument to a cable on the segment (preferably near the hub

or patch panel) and disconnect one node or connection at a

time until the “IN” bar or LEDs show a normal traffic level. The

Net-Advisor measures the total traffic on a segment and can be

attached on any cable that is not isolated from the rest of the

segment.

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Stations with a single network address that have multiple

adapters installed are difficult to monitor for individual adapter

loading. The Net-Advisor used in the Traffic or Log Mode

provides bandwidth utilization for each independent adapter that

is switched or on a separate segment. This measurement can

identify if additional or faster adapters are required.

Identifying Unused Cable RunsIdentifying Unused Cable Runs

Identifying Unused Cable Runs

As networks grow and change, cable runs may be

disconnected at the remote end but not removed from the

system. Many wiring closets and patch panels contain unused

cables which waste valuable connection points that could be

reconfigured to meet new requirements. The Net-Advisor used

in the Traffic Mode can quickly identify which cables are inactive

by looking for network activity with the IN bar, the LEDs or the

Audio Mode.

JUNE 1998

TS023A and TS024A

NET-ADVISOR and

NET-ADVISOR RS

DATA CLAMP

CUSTOMER

SUPPORT

INFORMATION

Call our Technical Support Specialists to

discuss your application.

For 24-hour technical support:

Call 724-746-5500 or fax 724-746-0746

To order: Call 724-746-5500

7:00 AM to 8:00 PM EST

Mail Order: Black Box Corporation,

1000 Park Drive, Lawrence, PA 15055-1018

724-746-5500 Fax 724-746-0746

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