It1 Eoct Set

Front 1

What is the formula for AHT? (Average Hold Time)

Back 1

total time of calls (In Seconds)
divided by
Number of calls

time/pegs=AHT

Front 2

What is the formula for CCS? (Centum Call Seconds)

Back 2

100 seconds of calls on the same circuit.
Pegs X AHT/100 = "?"

Front 3

What is the formula for Erlangs?

Back 3

1hr, 60min, 3600sec, 36ccs

Pegs X AHT/3600 = "?"

Front 4

When should you initiate a traffic analysis?

Back 4

1) Lots of Busy signals
2) Organizational Changes
3) Annual maintenance.

Front 5

What are the 4 steps to voice network traffic analysis?

Back 5

1) Determine traffic demand
2) Set Traffic model
3) Select GoS (Grade of Service)
4) Determine # of trunks needed

Front 6

How is Grade of Service (GoS) written?

Back 6

P.xx

P = probability
xx = %
exp: P.01 means Probability of calls being blocked is
1%

Front 7

What are the three types of traffic models, aka traffic tables?

Back 7

Erlang B
Poisson
Erlang C

Front 8

What are the 3 primary blocked call behavior theories?

Back 8

BCC, BCH, BCD

Blocked Calls: Cleared
Held
Delayed

Front 9

Which blocked call theories go with which traffic models?

Back 9

BCC = Erlang B

BCH = Poisson

BCD = Erlang C

Front 10

How to convert from CCS to Erlangs?

Back 10

Erlangs = #CCS/36


(opposite: CCS = #Erlangs X 36)

Front 11

What two ITU-T Recommendations are used for traffic analyses?

Back 11

E.500 Traffic Intensity Measurement Principles

E.492 Traffic Reference Period

Front 12

The amount of traffic that the network has at a given time, described as normal or high.

Back 12

Load Condition

Front 13

Infrequently encountered operating conditions for which expectations would not necessarily be met, but the level of performance achieved should be high enough to avoid significant user dissatisfaction.

Back 13

High Load Conditions

Front 14

The ITU-T Recommendation E-500 provides descriptions of sampling intervals used in a traffic analysis. The sampling periods should be in "?" and/or "?" intervals.

Back 14

60 &/or 15 minute intervals, according to this recommendation.

Front 15

What two sampling methods presented by ITU-T should be used to determine the peak daily traffic?

Back 15

Daily Peak Period (DPP)

Fixed Daily Measurement Interval (FDMI)

Front 16

Measurement collected continuously every hour of each business day during a month.

Back 16

DPP

Daily Peak Period

Front 17

Measurements collected only during predetermined peak sampling intervals of a month.

Back 17

FDMI

Fixed Daily Measurement Interval

Front 18

What sampling period is most commonly used in Coast Guard applications for Daily Peak Traffic Intensity?

Back 18

60 Minute sampling period.

Front 19

What is the hour of the day with the highest traffic intensity called?

(The number of Erlangs or CCS used during that hour)

Back 19

Busy hour

Front 20

What is the basis for determining normal and high load traffic intensities?

Back 20

The daily "peak traffic" intensity measurement

Front 21

What is the recommended method by ITU-T for measuring daily traffic intensity?

Back 21

the Daily Peak Period (DPP) method

Front 22

Which sample is used for the normal load traffic intensity?

Back 22

The 4th highest daily traffic intensity measurement.

Front 23

Which sample is used for the high load traffic intensity?

Back 23

The 2nd highest daily traffic intensity measurement.

Front 24

What are the two types of traffic that should be considered?

Back 24

Offered Traffic

Carried Traffic

Front 25

Calls that are attempted on the system, both blocked calls and carried traffic.

Back 25

Offered traffic

Front 26

What is Carried Traffic?

Back 26

Traffic that is actually serviced by telecommunications equipment.

Front 27

If the traffic system blocks some of the call arrivals, the measured traffic intensity is a measure of what?

Carried Load
Offered Load

Back 27

Carried Load

Front 28

Most PBX's have the following functions that provide the data on carried traffic needed for a traffic analysis:

Back 28

Station Message Detailed Recording (SMDR)

Trunk Group Summary (aka Traffic Summary)

Front 29

On what port does the output of traffic analysis functions usually send to a printer?

Back 29

RS-232 port

Front 30

A report that provides information on each call made by a station (extension). It will provide a sequential output of all calls on a PBX, and may include:
Station making the call
Trunk accessed
Date, Time, Duration & number dialed.

Back 30

Station Message Detailed Recording (SMDR), but may be called a Call Detail Recording (CDR) depending on the manufacturer of the PBX.

Front 31

A report usually showing:
Peg count
Busy peg
Total usage

Back 31

Trunk Group Summary

Front 32

The number of times the trunk group is accessed to make an outgoing call.

Back 32

Peg count

Front 33

The number of times a trunk group is accessed to make an outgoing call and it is in use or busy.

Back 33

Busy peg

Front 34

Amount of time the trunk group is in use, or Total Usage is normally given in what units?

Back 34

Centum Call Seconds (CCS)

Front 35

What are the two types of blocked calls?

Back 35

Outgoing

Incoming

Front 36

Which type of blocked call is not seen by the PBX

Back 36

Incomming

Customer outside the network attempts an incoming call.

Front 37

What percentage of blocked calls is negligible, and requires no action?

Back 37

Less than 15%

Front 38

What ITU-T Recommendation is Estimation of Traffic Offered in the Network to estimate the blocked traffic, then add this to the carried traffic to determine offered traffic?

Back 38

ITU-T Recommendation E.501

Front 39

What does Grade of Service (GoS) refer to?

Back 39

The % of calls that encounter blockage during the busy hour.

Front 40

In most business situations, circuits are designed for a GoS of between what % blockage?

Back 40

1% and 5%

Front 41

In Erlang C table, what do A, N, Pd, D1, & D2 stand for?

Back 41

Offered load in Erlangs
Number of servers required
Probability that a call will be delayed
Average delay of all calls.
Average delay of delayed calls

Front 42

What should you provide in a report of your traffic analysis?

Back 42

Date of sample
Busy hour, peak traffic, used
Given GoS
Traffic Table used
Number of trunks needed
Used SMDR, Trunk Summary or Commercial report

Front 43

If traffic intensity is uniform, traffic patterns are predictable and peak periods occur at irregular intervals.
What decisions will you make about measuring traffic samples?

Back 43

60-minute intervals, DPP method

Front 44

On a network where users keep hitting the redial button until they get a free trunk, what traffic model should you use?

Back 44

Poisson

Front 45

What is NOT true about Grade of Service (GoS)?
A. It refers to % of calls that encounter blockage.
B. The GoS may be different for different days.
C. Alternate routing may maximize the load on a group of circuits without requiring a higher GoS
D. It includes % of incomplete/busy calls.

Back 45

D. It includes percentage of calls that is not completed because the called number is busy

Front 46

On a network where callers are transferred to another trunk when they encounter blockage, what traffic model should you use?

Back 46

Erlang B

Front 47

The average hold time (AHT) for calls in a traffic study is 1 minute 40 seconds. How many erlangs is this?

Back 47

[(1m X 60s/m) +40s]/3600 = 100/3600 =

0.0277

Front 48

The average hold time (AHT) for calls in a traffic study is 1 minute 40 seconds. How many CCS is this?

Back 48

[(1m * 60s/m)+40s]/100 =

1

Front 49

From the CDR report, you determined that busy hour traffic is 12.9 erlangs. How many CCS is this?

Back 49

12.9 * 36 =

464.4

Front 50

From the traffic summary, you determined that usage during normal traffic load is 44 CCS. How many erlangs is this?

Back 50

44/36 =

1.222

Front 51

How do you verify errors are within appropriate levels on the Network Status Web Page?

Back 51

Divide errors by the number of packets in/out (using the lower of the two)

exp: Errors=2257, PktsIn/Out= 503541/500694
2257/500694= 0.0045 = 0.45%

Front 52

What % is an approprite level for network errors, resulting in no action required (otherwise, you must notify supervisor)

Back 52

Less than 1%

Front 53

What is involved in monitoring switch performance, and how often should you look at the error log?

Back 53

1) Monitoring bandwidth of each switch
2) Reviewing error log, Daily!

Front 54

At minimum, you should monitor bandwidth utilization weekly, but must monitor data usage more frequently when?

Back 54

1) There are changes to the network (check every
few days)
2) You have determined a problem exists, but have not
isolated it (check as often as needed)

Front 55

What were previous versions of the Fluke OptiView 6.0 called?

Back 55

Network Inspector

Front 56

What does the Fluke OptiView 6.0 "agent" do?

Back 56

Gathers data from every host & delivers it to the "console," assesses the LAN, and adds applicable information into the database.

Front 57

What is the Fluke OptiView 6.0 "console" used for?

Back 57

Receiving data from the "agent," for reading the database, and allows every ESU to view their LAN.

Front 58

What % of switch utilization should a supervisor be notified immediately, and may be necessary to isolate segment with other switches and install switches and routers?

Back 58

≥ 40%

Front 59

What % of switch utilization should a supervisor by notified, and the cause of high utilizaiton need be identified?

Back 59

Between 20% and 40%

Front 60

What % of switch utilization requires no action?

Back 60

≤ 20%

Front 61

The percent of total available bandwidth over 24 hours based on segment utilization seen at that interface.

Back 61

Average utilization

Front 62

When reviewing Error Rates of top ten ports on Fluke OptiView, what percentage calls for IMMEDIATE notification of your supervisor?
Between what %s should you notify your supervisor; and, what % requires no action?

Back 62

≥ 5%

Between 1% and 5%

≤ 1%

Front 63

What three catagories of problems are identified on the Fluke OptiView's Problem Log?

Back 63

Error
Warning
Information

Front 64

How frequently should a check for both bandwidth utilization and errors be performed at a unit with < 30 people?

Back 64

No change to network - Monthly

Changes to network - Weekly

Possible virus activity - Daily

Front 65

How frequently should a check for both bandwidth utilization and errors be performed at a unit with ≥ 30 people?

Back 65

No change to network - Weekly

Changes to network - Weekly

Possible virus activity - Daily

Front 66

What frequency routine should you use to monitor network status on the CGONE Network Status page?

Back 66

Weekly, at different times and on different days of the week

Front 67

Last week when you checked the CGONE Network Status web page, RX had a reading of 8%. Yesterday you checked it and it was at 20%. You checked it again this morning and it is around 18%. What should you do?

Back 67

Notify your supervisor immediately

Front 68

When you checked the CGONE Network Status web page, your unit had the following reading?
Errors=3029, Discards=443, PktsIn/Out= 303126/301430
What action should you take?

Back 68

Notify your supervisor

Front 69

On an individual switch, which average utilization rate indicates there is a problem?

Back 69

40%

Front 70

On an individual switch, which error rate indicates there is a problem?

Back 70

1%

Front 71

What must be considered when determining the UPS needs of a unit?

Back 71

•Proper safeguarding of equipment

•Cost effective solutions

•Standardized procedures

Front 72

Typically, a UPS can provide two types of system protection:

Back 72

•Surge Suppression

•Voltage Regulation

Front 73

There are three main types of UPS:

Back 73

Standby

Line Interactive

Online

Front 74

Which type of UPS draws AC current from the outlet and switches to the battery after detecting a loss of power. This switch only takes milliseconds, and is often unnoticed.

Back 74

Standby, aka offline, UPS

Front 75

Which type of UPS interacts with the AC power to smooth out the waveforms and correct the rise and fall of voltage

Back 75

Line Interactive UPS

Front 76

Which type of UPS is the most advanced UPS. The inverter rectifies incoming AC power to DC current, which charges the battery, and then changes the DC current back to AC to provide clean power. In this case, the protected equipment never receives power directly from the AC source. These units contain cooling fans, which have the potential to influence your telecommunications room’s environment (i.e. sound, temperature).

Back 76

Online UPS

Front 77

The Coast Guard primarily uses a UPS in one of three ways:

Back 77

1) Provide emergency power.

2) Provide clean power.

3) Unattended Shutdown.

Front 78

There are two common methods for determining power needs based on the measurement used:

Back 78

Amperage (amps): Multiply # of amps by nominal line
voltage.

Wattage (watts): Multiply # of watts by 1.4

Front 79

What is the nominal line voltage for North America?

Back 79

120

Front 80

When determining run time requirements for a UPS, it is important to note the following local needs:

Back 80

•Is the equipment going to be shut down by duty personnel or software?
•If duty personnel, what is the maximum possible response time?
•If software, how many minutes does it take to shut down the equipment?
•Is there a generator the equipment will switch to? If so, what is the delay time for the power to shift to generator?

Front 81

What type of measurement can be used when assessing UPS power requirements?

Back 81

Watts

Front 82

What is the one purpose of a UPS?

Back 82

Provide clean power

Front 83

Any device used to track outgoing calls traffic information; number dialed, trunk accessed, or length of call.

Back 83

Call Accounting

Front 84

Call accounting is used for?

Back 84

Outgoing call traffic

Front 85

How many options for storage does the call accounting system provide?

Back 85

Two

Front 86

What does EKS stand for?

Back 86

Electronic Key Systems

Front 87

When coordinating a backup on a telephone system, you should consider _____.

Back 87

where the backup should be stored

Front 88

What is the first step required to create a backup schedule for telephone systems?

Back 88

Create a list of equipment to be backed up

Front 89

Why is backup verification performed?

Back 89

To ensure data is restorable

Front 90

What is the last step in all restorations?

Back 90

Document the restoration

Front 91

The main processor card on a Nortel Option 11C PBX has been replaced after a failure. You have been tasked to restore it from the backup set.

What is the first step?

Back 91

Retrieve the most current backup media.

Front 92

The hard drive for the computer that handles the voice mail has been replaced after a failure. You have been tasked to restore the system to full operation.

What needs to be restored?

Back 92

All data on the drive

Front 93

Definition: Total time of all calls in a specified period divided by the number of calls in that period.

Back 93

AHT

Average Hold Time

Front 94

What is Normal Load Condition?

Back 94

Operating conditions w/ busy frequency meeting expectations.

Front 95

Definition:
The number of calls, attempted calls, and messages over a circuit, line or group of lines during a given specific time-period.

Back 95

Traffic

Front 96

Normal & High load traffic intensities are defined over what time interval?

Back 96

Monthly

Front 97

The amount of time the trunk group is in use, usually given in CCS.

Back 97

Total Usage

Front 98

Typical GoS rates used for traffic engineering are:

Back 98

P.01, P.03, P.04 & P.10

Front 99

If total wattage of three devices equals 1170watts, what UPS voltage is needed?

Back 99

1170 * 1.4 = 1638v


When given watts, multiply total watts by 1.4

Front 100

What is the standard % above needed capacity you should allow room for future expansion when determining the right UPS.

Back 100

20%

Front 101

As an IT1, you are responsible for coordinating backups of IT systems, which includes:

Back 101

Assessing best TIME to perform them
Setting a schedule
Verifying completion
Documenting the actions taken.

Front 102

What is the best way to ensure backups are being conducted as planned?

Back 102

Perform SPOT CHECKs