MAN-13891-US001_C00_MTT_25-26_W-TIMS_MMD

8/14/2019 MAN-13891-US001_C00_MTT_25-26_W-TIMS_MMD

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1SSMTT-25/-26 Module

MAN-13891-US001 Rev C00

SSMTT-25 W-TIMS

and

SSMTT-26 Responder

Modules for the

MTT and xDSL

Family of Products

Users Manual

SSMOD-25M

302 Enzo Drive San Jose, CA 95138

Tel: 1-408-363-8000 Fax: 1-408-363-8313


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2 SSMTT-25/-26 Module

2010 Sunrise Telecom Incorporated. All r ights reserved.

Disclaimer: Contents subject to change without notice and arenot guaranteed for accuracy.

Warning

Using the supplied equipment in a manner not specified by Sunrise

Telecom may impair the protection provided by the equipment.

End of Life Recycling and Disposal Information

DO NOT dispose of Waste Electrical and Electronic Equipment(WEEE) as unsorted municipal waste. For proper disposal return

the product to Sunrise Telecom. Please contact our local officesor service centers for information on how to arrange the return

and recycling of any of our products.

EC Directive on Waste Electrical and Electronic Equip-ment (WEEE)

The Waste Electrical and Electronic Equipment Directive aims tominimize the impact of the disposal of electrical and electronicequipment on the environment. It encourages and sets criteria

for the collection, treatment, recycling, recovery, and disposal ofwaste electrical and electronic equipment.


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SSMTT-25/-26 Users Manual

Table of Contents

1 SSMTT-25/-26 Modules .......................................................5

1.1 SSMTT-25/-26 Module LEDs ............................................6

1.2 SSMTT-25/-26 Connector Panel ........................................6

1.3 SSMTT-26 Responder Module Connector Panel ...............6

2 SSMTT-25/-26 Menus ..........................................................7

3 SSMTT-25 Line Measurements ..........................................8

3.1 Single-ended Line Tests ..................................................10

3.1.1 Background Noise ........................................................10

3.1.1.1 PSD Background Noise .............................................103.1.1.1.1 Testing Interferers in TERM Mode ..........................143.1.1.1.2 Testing Interferers in BRIDGE Mode ......................163.1.1.2 Other Background Noise Tests ..................................18

3.1.2 Level Meter ...................................................................193.1.3 Frequency Generator....................................................20

3.1.4 Impulse Noise ...............................................................213.1.5 Longitudinal Balance ....................................................24

3.1.6 Near End Crosstalk ......................................................25

3.2 Controller (Paired) Tests ..................................................27

3.2.1 Insertion Loss ...............................................................273.2.1.1 Insertion Loss for DMT/CAP Frequency Band ..........27

3.2.1.1.1 Detecting Bridge Taps with Insertion Loss ..............303.2.1.2 Single Frequency Insertion Loss Tests ......................313.2.2 Signal-to-Noise Test ......................................................32

3.2.3 Far End Crosstalk .........................................................34

4 SSMTT-26 Responder Module .........................................36

4.1 Responder Testing-SSMTT-25 & -26 ..............................36

4.2 Cable Pair Detect-SSMTT-26 ..........................................37

4.3 Tx Cable Pair Tone-SSMTT-26 ........................................38

5 Express Limited Warranty ................................................38

Index .......................................................................................39


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WarningUsing the supplied equipment in a manner not specified by Sunrise

Telecom may impair the protection provided by the equipment.CAUTIONS!

Do not remove or insert the module while the test set is on. Inserting or re-moving a module with the power on may damage the module.

Do not remove or insert the software cartridge while the test set is on. Oth-

erwise, damage could occur to the cartridge.

End of Life Recycling and Disposal Information

DO NOT dispose of Waste Electrical and Electronic Equipment(WEEE) as unsorted municipal waste. For proper disposal return

the product to Sunrise Telecom. Please contact our local officesor service centers for information on how to arrange the returnand recycling of any of our products.

EC Directive on Waste Electrical and Electronic Equip-

ment (WEEE)

The Waste Electrical and Electronic Equipment Directive aims tominimize the impact of the disposal of electrical and electronicequipment on the environment. It encourages and sets criteria

for the collection, treatment, recycling, recovery, and disposal ofwaste electrical and electronic equipment.

2010 Sunrise Telecom Incorporated. All rights reserved.

Disclaimer: Contents subject to change without notice and arenot guaranteed for accuracy.


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1 SSMTT-25/-26 Modules

This users manual covers the use of the SSMTT-25 W-TIMS

module and the SSMTT-26 Responder module.

SSMTT-25

The SSMTT-25 W-TIMS module is designed to do the following:

Single Ended Loop Testing

Background Noise

Impulse Noise Longitudinal Balance

Near End Crosstalk (NEXT) Frequency Generator

Level Meter

Paired Testing

The following tests require a responder ( see Table 1) at the far

end:

Insertion Loss

Signal-to-Noise Ratio Far End Crosstalk (FEXT)

SSMTT-26

The SSMTT-26 Responder module supports:

Responder functions: Insertion Loss, FEXT, Signal-to-NoiseRatio and Loop Resistance.

Cable Pair Detection

Tx Cable Pair Tone

See section 4for more details.

The responder used for paired testing may be a SSMTT-25 W-TIMS, SSMTT-26 Responder, SSMTT ACM Chassis or SSxDSL

Full Chassis. Use the following table to determine testing combina-tions.

Controller ResponderSSMTT-25, W-TIMS SSMTT-25 W-TIMSSSMTT-25, W-TIMS SSMTT-26 ResponderSSMTT-ACM, Chassis SSMTT-26 ResponderSSMTT-ACM, Chassis SSMTT-25 W-TIMSSSMTT-25, W-TIMS SSMTT-ACMSSMTT-25, W-TIMS SSxDSL Full ChassisSSxDSL, Full Chassis SSMTT-25 W-TIMSSSxDSL, Full Chassis SSMTT-26 ResponderNote: SSMTT-25 does not support loop resistance and cable pair detect, thisrequires two SSMTT-ACMs or SSMTT-ACM and SSMTT-26. SSxDSL FullChassis does not support FEXT, and Cable Pair Detect. Use of a SSxDSLFull Chassis paired with SSMTT-25, -26 will change the measurementspecification for Dual Ended Testing.

Table 1 Controller/Responder Testing Combinations


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1.1 SSMTT-25/-26 Module LEDs

Only the MODULE (xDSL) LED is active during W-TIMS/Re-sponder testing. Upon accessing the W-TIMS/Responder menu

(by pressing the MODULE/xDSL key), the MODULE (xDSL) LEDlights green.

1.2 SSMTT-25/-26 Connector Panel

The W-TIMS module connector panel is shown in Figure1.

Figure 1 SSMTT-25 Connector Panel

The W-TIMS module contains two RJ45 test ports:

MAIN

The MAIN port is used for all single loop testing.

AUX

This AUX port is used with the MAIN port for dual loop testing.

1.3 SSMTT-26 Responder Module ConnectorPanel

The Responder module connector panel is shown in Figure 2.

Figure 2 SSMTT-26 Connector Panel

The Responder module contains two 3 pin banana test ports

MAIN

The MAIN port is used for single loop Responder functions, TX

Cable Pair Tone and Cable Pair Detect.

AUX

This AUX port is used with the MAIN port for dual loop Responderfunction.


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2 SSMTT-25/-26 Menus

Figure 3 SSMTT-25 W-TIMSMenus

Figure 4 SSMTT-26 Responder Menu


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3 SSMTT-25 Line Measurements

There are two types of line measurements, single-ended and

paired. Single-ended tests require one test set; the test set per-

forms the test and takes the measurement from one end of thecable. Refer to Figures and 6.

Figure 5 Single-ended Test-Main Port

Single-ended tests using the MAIN Port are:

Background Noise checks for interfering services or noise

Impulse noise checks for any transient noise sources Frequency generator and level meter sends and receives test

tones

Longitudinal Balance checks for cabl balance

Figure 6 Single-ended Test-Main and AUX Ports

The single-ended test using the MAIN and AUX Ports is:

Near end crosstalk (NEXT) checks for crosstalk between two

cable pairs at the near end

Paired tests require two test sets; one on each end of the cablepair. Refer to Figure 7 and 8.


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Figure 7 Paired Tests-Main Port

The paired tests using the MAIN Port are:

Insertion Loss measures attenuation over the 2 MHz spectrum

or for a single frequency Signal-to-Noise measures the signal-to-noise ratio over the 2

Mz spectrum

Figure 8 Paired Test-Main and AUX Port

The paired test using the MAIN and AUX Ports is:

Far End Crosstalk (FEXT) checks for crosstalk between one

cable pair at the near end and an adjacent pair at the farend

Note that many test results screens feature a STORE F-key, al-lowing you to save results. See the Storing and Printing chapter

in your test set users manual for details on this feature.


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3.1 Single-ended Line Tests

3.1.1 Background Noise

The Background Noise Test is used to detect interferers from suchsources as other digital services or AM radio. This is a single-

ended test. It is recommended that the far end be terminated at100wherever possible.

You may test for noise spectrum up to 2 MHz or choose to place alter, which tests at ISDN BRI, HDSL, or ADSL frequency bands.

For PSD testing, common interferer templates can be placed onthe screen so you may easily determine the type of interferer on

your circuit.

3.1.1.1 PSD Background Noise

The PSD (Power Spectral Density) background noise measure-ment includes the full frequency bandwidth for both ADSL DMTand CAP services.

1. Connect the test set to the pair to be tested to the MAIN port

on the module. Refer to Figure 9. In this figure, alligator clipsare used to connect to te copper pair.

Figure 9 Connecting the Test Set to Tip and Ring

2. Press the keypad MODULE (xDSL) key.3. Select BACKGROUND NOISE.

4. The setup screen appears as shon in Figure 10.


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Figure 10 Background Noise Setup Screen

Rx LEVEL

Options: TERM (F1), BRIDGE (F2)

Set the receiver level for the test set:

TERM places a 100 termination on the received signal.This should be used for out-of-service testing only. When youhave selected TERM, you can use interferer templates in the

measurement screen. BRIDGE is a high-impedance mode that protects the live sig-

nal. You may use this mode for in-service testing. When youhave selected BRIDGE, you may use Tx Power masks in the

measurement screen.

Note: If you are connecting to a live circuit, be sure to selectBRIDGE mode before connecting.

TYPE

Options: PSD (F1), E (F2), F (more, F1), G (more, F2)

Select the F-key corresponding to the desired test.

PSD: measures noise in the full ADSL DMT/CAP spectrum,up to 2 MHz.

E: measures noise in the spectrum for ISDN BRI. Filter sec-tions:

High Pass: 3 dB down at 1 kHz

Low Pass: 3 dB down at 50 kHz

F: measures noise in spectrum for HDSL. Filter sections:



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G: measures noise in spectrum for ADSL. Filter sections:


Low Pass: 3 dB down at 1.1 MHz

Note: A 100to 135converter cable is recommended for E andF filter measurements.

5. For ADSL DMT/CAP, press PSD (F1). Then, press START (F3)

to begin the measurement.6. The results are hown in Figure 11.

Figure 11 PSD Background Noise Results

The F-Keys in this screen are used as follows:ZOOM_OUT/IN (F1): ZOOM sets the display scale for the screen.

The resolution is 3 tones/pixel with the highest noise value of thethree tones plotted on the screen.

Note: When you have zoomed in the full amount, two more F-keys

are available: PG_LFT (more, F1) moves the screen display tothe left to display the lower tone frequencies. PG_RGT (more,

F2) moves the screen display to the right to display the highertone frequencies.

MASK (F2): MASK places various templates of noise or PSDmasks on the screen to help you determine the interferer type.

After pressing MASK, use the keypad left/right arrow keys to

scroll through the various template masks. The displayed maskis identified at the top of the screen.

CURSOR (F2): Press CURSOR to move the cursor on the display.This can tell you the exact frequency of a disturber. After press-


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ing CURSOR, use the keypad left/right arrow keys to move the

cursor. Check the Frequency reading at the bottom to know theexact frequency.

dBm and dBm/Hz (more, F3): These F-keys toggle the noisereading at the bottom of the screen. dBm is a pure power reading

with a reference to 1 milliwatt. The dBm/Hz measurement uses areference bandwidth of 4.3125 kHz for the reading.


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3.1.1.1.1 Testing Interferers in TERM Mode

TERM Mode is used for out-of-service testing only. Before plug-ging into the circuit in TERM Mode, be certain that the circuit can

be taken out of service. Use the following procedure:1. Press the keypad MODULE (xDSL) key.2. Select BACKGROUND NOISE.

3. In the setup screen, select:

Rx LEVEL: TERM

TYPE: PSD

4. Connect the test set to the circuit as shown in Figure 9. It is

important to connect the test set to the circuit before startingthe measurements for accurate results.

5. After connecting to the circuit, press START (F3). A sample

screen ppears in Figure 12.

Figure 12 Background Noise-TERM Mode

6. If you do not see a strong signal at first, increase the vertical gain.Press the keypad up arrow key until the signal appears.

7. To display an interferer mask on the screen, press MASK (F2).

Use the keypad left/right arrow keys to select the interferertype. These interferer types are based on crosstalk models

defined in various standards based on the number and typeof disturber. They are described in Table 2.

8. You can also view your results in a tabular format. This formatprovides a list of the background noise measurements for each

tone level. To view the tale, press TABLE (F3).


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Interferer Type Description24-DSL NEXT 24 IDSL services in same binder group10-HDSL NEXT 10 HDSL services in same binder group4-T1 ADJ NEXT 4 T1 services in an adjacent binder group24-T1 ADJ NEXT 24 T1 services in an adjacent binder group10-ADSL DN NEXT 10 ADSL downstream services in same

binder group10-ADSL UP NEXT 10 ADSL upstream services in same binder

groupT1.601 NEXT ANSI T1.601 Basic Rate ISDN in same

binder pair10-DSL NEXT 10 IDSL services in same binder group10-ADSL NEXT 10 ADSL services in same binder group10-T1 ADJ NEXT 10 T1 services in an adjacent binder groupINT AMI 2M International 2.048 Mbps AMI signal (E1)ETSI BRA ETSI Basic Rate ISDN serviceETSI HDSL ETSI HDSL serviceADSL XTALK, ANSI 7,13 ADSL cross-talk ANSI loops 7 & 13ADSL XTALK CSA 4 ADSL cross-talk, CSA loop 4ADSL XTALK CSA 6 ADSL cross-talk, CSA loop 6ADSL XTALK CSA 7 ADSL cross-talk, CSA loop 7DSL NEXT IDSL service in same binder groupHDSL NEXT HDSL service in same binder groupG.DMT EC ADSL UPNEXT

G.DMT Echo-cancellation ADSL upstreamservice in same binder group

G.DMT FDM ADSL UPNEXT

G.DMT Frequency division multiplexingADSL upstream service in same bindergroup

HDSL2 DN NEXT HDSL2 downstream service in same bindergroup

HDSL2 UP NEXT HDSL2 upstream service in same bindergroup

T1 NEXT T1 service in same binder groupEC ADSL DN Echo-cancellation downstream ADSLG.DMT FDM ADSL DNNEXT

G.DMT Frequency division multiplexingADSL downstream service in same bindergroup

Table 2 Interferer Type

The masks shown in Table 2 represent the common disturbers

associated with DSL circuits. If you see an increase in the back-

ground noise level (Y-value), scroll through the various templatesuntil a template matches the signal. This will help you to distinguishthe noise source on your circuit.


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3.1.1.1.2 Testing Iterferers in BRIDGE Mode

Figure 13 Background Noise-BRIDGE Mode

CAUTION

Bridge mode testing does not interfere with standarddigital line technologies such as T1 and E1. However, for

complex technologies using modem communications, likeADSL, bridging onto the circuit can cause a significant

drop in the noise margin causing the ADSL circuit to losesynchronization and then resynchronize.

In BRIDGE Mode, the test set places a high impedance on the

received signal to protect the circuit. There will be a slight hit onthe circuit, which may result in momentary alarms. Follow this

procedure:

1. Press the keypad MODULE (xDSL) key.

2. Select BACKGROUND NOISE.3. In the setup screen select:

RxLEVEL: BRIDGE

TYPE: PSD

4. Connect the test set to the circuit as shown in Figure 9. It isimportant to connect the test set to the circuit before starting

the measurements for accurate results. Also, try to be as closeto the transmitter as possible. For example, when checking

the ATU-C Tx signal, connect as close to the DSLAM as pos-sible. You may clip directly onto the transmit pair with alligator

clips.5. After connecting to the circuit, press START (F3). A sample

screen appears in Figure 13.


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6. If you do not see a strong signal at first, increase the vertical gain.

Press the keypad up arrow key until the signal appears.7. If you want to display a template mask on the screen, press

MASK (F2). Then use the keypad left/right arrow keys to scrollthrough the different masks. The MASK options are:

G.DMT ATU-C

G.DMT ATU-R

ETR 152 CAP 1-PAIR

ETR 152 CAP 2-PAIR

ETR 152 2B1Q 392K

ETR 152 2B1Q 584K

ETR 152 2B1Q 1160K

CLASS1 PSD

CLASS 2 PSD

CLASS 3 PSD

CLASS 4TU-CCLASS 4TU-R

CLASS 7 PSD

A PASS/FAIL indicator is displayed next to the template type.

This PASS/FAIL refers to the cursor position only. To check if theoverall signal meets the maximum allowable PSD requirement,

check the graphic and verify that the signal does not overlap (crossabove) the template mask. For example, in Figure 13, the cursoris at 142.3 kHz; the PASS refers to this frequency only. You can

move the position of the cursor with the keypad right/left arrowkeys (Note the zoom factor). The screen starts out displaying the

full 2 MHz bandwidth in one screen. This means that each pixel

actually represents three tones (the highest noise level for thosethree tones is displayed). For better resolution, press ZOOM_IN(F1). You can use the PG_LFT (more, F1) and PG_RGT (more,F2) keys to shift the screen display from the higher and lower

tones.

8. You can also view your results in a tabular format. This formatprovides a list of the background noise measurements for each

tone level. To view the table, press TABLE (F3).


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3.1.1.2 Other Background Noise Tests

In addition to the ADSL DMT/CAP background noise test de-scribed in section 3.1.1.1, you also may test background noise in

the ISDN BRI, HDSL, or ADSL spectrums. Refer to the followingprocedure:


2. Select BACKGROUND NOISE.3. Select Rx Level: TERM (F1) places a 100termination on the received signal.

This should be used for out-of-service testing only. BRIDGE (F2) is a high-impedance mode that protects the live

signal. You may use this mode for in-service testing.

Note: If you are connecting to a live circuit, be sure to selectBRIDGE mode before connecting.

4. Select the type:

E (F2): measures noise in the spectrum for ISDN BRI. Filtersections:



F (more, F1): measures noise in spectrum for HDSL. Filtersections:



G (more, F2): measures noise in spectrum for ADSL. Filtersections:


Low Pass: 3 dB down at 1.1 MHzNote: Sunrise Telecom recommends a 100to 135convertercable for E and F filter measurements. Effective range is from

10 kHz.

5. Connect the test set to the circuit as shown in Figure 9.6. Press START (F3). The results display the filter type and the

noise reading.


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3.1.2 Level Meter

The LEVEL METER can be used to measure the frequency andlevel of a received tone. The LEVEL METER can be connected

to a conventional TIMS tone generator or a frequency oscillatorat the far end. The LEVEL METER measures the highest power

frequency. Refer to Figure 14. To use the LEVEL METER:

1. Connect the test set to the circuit as shown in Figure 9.2. Press the keypad MODULE (xDSL) key.3. Select LEVEL METER.

4. The results are sown as in sample Figure 14.

Figure 14 Level Meter


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3.1.3 Frequency Generator

You may use the test set to send a tone at a specified frequencyand level. You can use a tone analyzer at the far end to measure

the level and frequency. To send a tone, refer to the followingprocedure:


2. Select FREQUENCY GENERATOR. A sample creen appearsin Figure 15.

Figure 15 Frequency Generator

You may adjust the frequency and level of your tone.

FREQ

Range: 10 to 2000 kHz

Use the keys (F1) and (F2) to adjust the tone frequency. The following increment/decrement values are available (press

the more F-key): +/- 0.1, +/-1, +/- 10, +/- 100.

dBm

Range: -20, -10, 0, +10 dBm

Use the keys +1 (F1) and -1 (F2) to adjust the tone level.

3. Connect the test set to the circuit as shown in Figure 9.4. Once you have set your frequency and level, press START (F3).

The test set will transmit the specified tone until you escape

out of the screen.


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3.1.4 Impulse Noise

The Impulse Noise feature detects impulse noise spikes on thesignal and keeps a running count of the number of impulse events

over time. Impulse noise is defined as a random pulse whoseamplitude is much higher than that of background noise. IEEE

defines impulse noise as any burst of noise that produces a volt-age exceeding the RMS value of the background or quantizing

noise by more than 12 dB [IEEE 743-1995]. Use the followingprocedure to test for impulse noise:

1. Connect the test set to the circuit using an alligator cable. Asample diagram is shown in Figure 9. Plug the cable into the

moduless MAIN port. Connect the alligator clips at the otherend directly to the cable pair.

2. Press the keypad MODULE (xDSL) key.3. Select IMPULSE NOISE.4. The Impulse Noise Setup sreen appears. Refer to Figure 16.

Figure 16 Impulse Noise Setup

Configure the setup parameters:

Threshold

Range: 50 dBrn to 100 dBrn

This defines the lower threshold value for an impulse noise event.

When the test set detects noise above this threshold, the test setrecords it as an impulse noise event.

Use the +1 (F1) and -1 (F2) keys to adjust this value. Press more (F4) to access +10 (F1) and -10 (F2).


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Delta

Range: 2 to 6

Delta sets the range for the Low, Middle, and High event counts.

In Figure 16, the threshold is set for 60 dBrn; this is the low count.The delta value is set for 4. Therefore, the low count refers to anynoise between 60 and 64; the middle count refers to any noise

between 64 and 68. High refers to any value above 68 dBrn.

Use the +1 (F1) and -1 (F2) keys to adjust this value.

Max Count

Range: 1 to 9999

Max count refers to the maximum number of impulse events thatwill be counted during a single measurement.

Use the +1 (F1) and -1 (F2) keys to adjust this value.

Press more (F4) to access +10 (F1) and -10 (F2). Press more again to access +100 (F1), -100 (F2)

Press more again to access +1000 (F1), -1000 (F2)

Dead Time

Range: 0.1 ms to 255 ms

Dead Time refers to the measurement delay after the unit detectsthe initial impulse. Dead Time begins as soon as the test set de-

tects the initial impulse. The test set resumes measuring eventsafter the dead time has elapsed. This prevents the test set from

measuring the same impulse noise spike multiple times.

Timer

Range: 1 to 999, Continu

Timer sets the duration time of the measurement. You can run your

test from 1 to 999 minutes. As soon as you start the measurement,the elapsed time starts counting up to this value. When it reaches

the timer value, the test stops. To run a continuous test, press more(F4) until CONTINU appears, and then press CONTINU (F1).

5. When you have completed the settings, press the START (F3)

F-key to begin the test. A sample results screen is shown inFigure 17.

Press RESTART (F4) to restart the measurement and reset

all counters to zero.Press STORE (F3) to save your results.


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Figure 17 Impulse Noise Results

Information in the top half of the screen:

ET: Elapsed Time begins counting as soon as you start the mea-

surement- either by pressing START from the setup screen orpressing RESTART (F4) from this screen. ET continues counting

until it reaches your set TIMER value.

RT: Remaining Time is a countdown from the time set as TIMER.It shows you how much time is left until the end of the test.

LOW: Displays the noise level for a LOW count. This is equal to

the THRESHOLD setting in the Setup screen.

MID: Displays the noise level for a MID count. This is equal to the

THRESHOLD setting plus the DELTA value.

HIGH: Displays the noise level for HIGH count. This is equal toMID plus the DELTA count.

Results at the bottom half of the screen:

LOW: The number of impulse noise spikes detected whose level

falls within the LOW value shown above (in between LOW andMID).

MID: The number of impulse noise spikes detected whose levelfalls within the MID value shown above (in between MID and

HIGH).

HIGH: The number of impulse noise spikes detected whose levelfalls within the HIGH value shown above (above HIGH).


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3.1.5 Longitudinal Balance

Longitudinal balance is used to determine whether the cable pairhas adequate balance for crosstalk immunity. The test set gener-

ates a perfectly balanced disturbing tone between the cable pairand ground. The resultant voltage on the cable pair is measuredand displayed in units of dB. To perform the test:

1. Connect the test set cable pair as shown in Figure 18.

2. Press the keypad MODULE (xDSL) key.3. Select LONGITUDINAL BALACE. See Figure 19for a sample

result screen.

Figure 18 Longitudinal Balance Connections

Figure 19 Longitudinal Balance

The measurement result is shown in dB. The measurement range is from 20 dB to 60 dB. This value

should be as high as possible.


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3.1.6 Near End Crosstalk

Near End Crosstalk (NEXT) is the crosstalk between one cablepair and an adjacent cable pair at the same end of the line. The

NEXT measurement consists of a single test set transmitting atest signal on one pair and simultaneously measuring the induced

crosstalk on an adjacent pair at the near end.

The NEXT measurement range covers a sweep from 12.9 kHz to2001 kHz in steps of 4.3 kHz. Results for test frequency and NEXTlevel are presented in both graphical and tabular format.

To perform the test:

1. Connect the test cable from the MAIN port to the desired cable

pair under test. Note that this port measures the amount ofinduced NEXT, see Figure 20.

2. Connect a second test cable from the AUX port to the desiredadjacent cable pair. Note that the test signal is transmitted from

the AUX port, see Figure 20.3. Press the keypad MODULE (xDSL) key.4. Select NEAR END CROSSTALK.

5. Press ENTER to start the 2 MHz SWEEP test, see Figure21.

The NEXT measurement is shown in dB. Te measurement value should be a high as possible.

Figure 20 NEXT Connections


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Figure 21 Near End Crosstalk

The following F-keys appear in Figure 21:

PG_LFT (F1) and PG_RGT (F2): These keys move the screendisplay to the left or right. The following screen displays areavailable:

13 kHz to 759 kHz

763 kHz to 1509 kHz 1255 kHz to 2001 kHz

TABLE (F3): This key displays the results in a tabular format (see

Figure 22). Note that F3 in the Table screen is GRAPH, whichreturns you to the graph results display.

STORE (more, F2)Save results.

RESTART (more, F3): Restart the test.

Figure 22 NEXT Results, Table


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3.2 Controller (Paired) Tests

There are three tests available in the CONTROLLER menu: Inser-

tion Loss, Signal-to-Noise, and Far End Crosstalk. These are paired

tests and require another test set in responder mode at the far end.This section outlines the controller setup for each application. Sec-tion 4discusses how to set the test set for responder mode.

3.2.1 Insertion Loss

Insertion loss testing is an excellent prequalification tool. It measuresattenuation using two test sets: the Responder unit sends the tones

from the far end, while the Controller unit conducts the measurement.It provides loss characteristics up to 2 MHz, including the entire

ADSL band (both DMT and CAP). Single frequency measurementsare also available. It can be used to qualify HDSL transmission (196kHz), T1 (772 kHz), U-Interface ISDN (40 kHz), etc.

3.2.1.1 Insertion Loss for DMT/CAP Frequency Band

Both ADSL CAP and DMT frequencies are covered with the ADSL

PSD (Power Spectral Density) test. For DMT ADSL, the attenu-ation measurement must be made for the entire DMT frequency

band: 22 kHz to 1.1 MHz. The test set measures beyond this rangeto 2 MHz to test for CAP ADSL. The Responder unit sends the

frequency sweep tones; the Controller unit takes the measure-ment. Follow these steps to configure the Controller unit:

1. Connect the test set to the circuit with the MAIN port. In Fig-ure 23, alligtor clips are used to connect to the tip and ring

wires.

Figure 23 Controller/Responder Dual Ended Test Setup


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3. Select CONTROLLER > INSERTION LOSS > ADSL PSD.ADSL PSD includes both the DMT and CAP bandwidth.

4. The top line of the screen shows the units status. There arethree possible states: Processing: The Responder has received the command and

is in the process of sending a tone. Completed: The Responder has carried out the command.

Failed: The Responder has failed to reply to the command.

5. The resuls show a level verses frequency plot. Refer to Figure24.

Figure 24 ADSL PSD Insertion Loss Result

ANSI T1.413 species insertion loss results for various loopsand impaired lines. Variables in these results include: wiregauge, impairments, and temperature.

To nd the exact insertion loss for a particular frequency, referto the results provided below the graph. Use the keypad left/

right arrow keys to move the cursor. Check the frequencyreading (Freq. kHz) until the cursor has reached the desired

frequency. Then refer to the loss reading (Loss dB) for thatparticular frequency.

The F-Keys shown in Figure 24 are:


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PG_LFT (F1) and PG_RGT (F2): These keys move the screen

display to the left or right. The following screen displays areavailable:

13 kHz to 759 kHz 763 kHz to 1509 kHz

1255 kHz to 2001 kHz

TABLE (F3): This F-key displays the loss readings in a tabularformat for eah particular tone. A sample screen is shown in Fig-

ure 25.

Figure 25 Insertion Loss, Table

BRG_TAP (more, F1): This key searches for and reports anybridge taps on the cable pair. See section 3.2.1.1.1.

STORE (more, F2): You may store both the Insertion Loss graphicand table results, refer to the Storing and Printing Results chapter

in your test set user manual for more details.

RESTART (more, F3): This key restarts the measurement andupdates the results.


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3.2.1.1.1 Detecting Bridge Taps with Insertion Loss

Insertion loss may be used as an alternative method for detectingbridge taps on the cable pair. Insertion loss can be advantageous

because it allows you to test a greater range than a TDR. Thismethod shows the presence of bridge taps and can calculate the

approximate length. However, a TDR is still needed to determinethe exact location.

1. In the Insertion Loss screen, press BRG_TAP (more, F1).2. The test set looks for any dips in the frequency curve. A typical

insertion loss result without any faults is a linear curve slop-ing downward. A bridge tap will appear as a subtle dip in the

curve. The bridge tap length affects different frequencies.3. If the test set finds a bridge tap, it moves the cursor to the dip.

It reports the length of the bridge tap (BT Ln) in feet at thebottom of the screen. Note that this is the length of the bridgetap, not the location.

4. The test set calculates the length based on the Vp (Velocity ofPropagation) setting shown above. The default setting is 0.66.

If you know the specific Vp setting, use the +VP (F2) and -VP(F3) F-keys to adjust the value. The Vp setting will affect the

length calculation for the bridge tap.5. Insertion loss can detect multiple bridge taps on the cable

pair. After the test set has detected the first bridge tap, pressBRG_TAP (F1) again to detect the next tap

Note: Insertion loss checks for dips in the frequency curve. Thesedips could be caused by other impairments or cable factors. You

should verify the presence of a bridge tap with a TDR.


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3.2.1.2 Single Frequency Insertion Loss Tests

The other Insertion Loss tests measure loss at one particularfrequency. Each can be used to qualify the span for a par ticular

transmission type (i.e. HDSL, T1, ISDN BRI). Follow these stepsto configure the Controller unit:

1. Connect the test set to the span as shown in Figure 23.

2. Press the keypad MODULE (xDSL) key.3. Select CONTROLLER > INSERTION LOSS.4. Select the desired Insertion Loss test and press the keypad

ENTER key. The tests should be used as follows:

HDSL (Euro): 150 kHz

HDSL (Euro): 292 kHz

HDSL, 2 pair T1: 196 kHz

HDSL, 1 pair T1: 392 kHz

HDSL E1: 260 kHz

ISDN BRI at the U-Interface: 40 kHzISDN BRI at the S-Interface: 96 kHz

DDS: 82 kHz

T1: 772 kHz

E1: 1.024 MHz

5. The results show the single frequenc tested and the dB lossat this frequency. Refer to Figure 26.

Figure 26 Single Frequency Insertion Loss


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3.2.2 Signal-to-Noise Test

After running an Insertion Loss test, you can also measure thesignal-to-noise ratio for each tone tested. The Signal-to-Noise test

is a good tool for determining the line conditions. It independentlymeasures the achievable signal-to-noise performance over the

full range of frequencies used by DSL modems. These resultscorrelate to the SNR measurements used by DMT modems to

adjust bit distribution and transmit power level. It can identifyfrequencies, which have low noise margins.

The Signal-to-Noise test is another paired test. The Responderunit transmits tones; the Controller unit measures the level of

each tone, as well as the background noise, and yields a signal-to-noise ratio.

Note: The Signal-to-Noise test depends on an Insertion Loss

measurement. Therefore, you must first perform an Insertion Loss

Measurement for ADSL PSD, then measure Signal-to-Noise forADSL PSD.

Follow this procedure for measuring Signal-to-Noise:

1. Connect the test set to the span as shown in Figure 23.

2. Perform an Insertion Loss measurement for ADSL PSD; referto section 3.2.1for more details.

3. After measuring Insertion Loss, press ESC to return to theCONTROLLER: MAIN MENU. Select SIGNAL TO NOISE and

press ENTER.4. The results show signal-to-noise (dB) verses frequency plot.

Refer to Figure 27.

Figure 27 Signal-to-Noise Result for ADSL DMT PSD


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Notes:

This test measures noise for a 2 MHz spectrum. The rst screendisplays tones from 13 kHz to 759 kHz. The second screen

displays tones from 763 kHz to 1509 kHz. The third screendisplays tones from 1255 kHz to 2001 kHz. Use the PG_LFT

(F1) and PG_RGT (F2) F-keys to change between these twoscreens.

To learn the exact S/N reading at a particular frequency, referto the results below the graph. Use the keypad left/right arrowkeys to move the cursor to the desired frequency (as read at

Freq. kHz). The S/N (dB) shows the exact signl-to-noise ratiofor that frequency.


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3.2.3 Far End Crosstalk

Figure 28 FEXT Connections

Far End Crosstalk (FEXT) is the crosstalk between one cablepair at the near end and an adjacent cable pair at the far end.The FEXT measurement requires two test sets at both ends of

the cable pairs. One test set transmits a test signal on one pairat one end. The second test set measures the induced crosstalk

on an adjacent pair at the far end. The FEXT measurement rangecovers a sweep from 12.9 kHz to 2001 kHz in steps of 4.3 kHz.The FEXT level values are presented in both graphical and tabular

format. FEXT is a Controller/Responder feature requiring two testsets placed at both ends of the cable pairs under test. To perform

the FEXT test follow these instructions:

1. Connect the Controller as follows (see Figure 28).

A. Connect a test cable from the MAIN Port to one of thedesired cable pairs to be tested. Pair 1 is tested for the

amount of induced FEXT.

B. Connect a second test cable from the AUX Port to the

desired adjacent cable pair.

2. Connect the Responder placed at the far end of the Controller(see Figure 28):

A. Connect a test cable from the MAIN Port to the same pair

as the MAIN port of the Controller.

B. Connect a second test cable from the AUX Port to the same

pair as the AUX Port of Controller.

3. On the Responder, press the keypad MODULE (xDSL) key

and select RESPONDER.4. Once all connections are established, you can begin the test.

The Controller will control the test as well as present the FEXT

results.


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A. On the Controller press the keypad MODULE (xDSL)

key.

B. Select CONTROLLER > FAR END CROSSTALK

C. After the 2 MHz SWEEP apears, press the keypad ENTERkey to begin the test (see Figure 29).

Figure 29 Far End Crosstalk

The FEXT measurement is shown in dB. The measurement value should be as high as possible.

The following F-keys are available:

PG_LFT (F1) and PG_RGT (F2): These keys move the screendisplay to the left or right.

TABLE (F3): This displays the results in a tabular format (see

Figure 30). Note that the F3 in the Table screen is GRAPH, whichreturns you to the graph results display.

SORE (more, F2): Saves results.

RESTART (more, F3): Restarts the test.

Figure 30 FEXT Results, Table


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4 SSMTT-26 Responder Module

The Responder Module Main Menu contains three items:

Responder

Cable Pair Detect Tx Cable Pair Tone

4.1 Responder Testing-SSMTT-25 & -26

The paired tests require a test set in Responder mode at the far

end. This test set responds to commands from the Controller(refer to Table 1). To set up the Responder function, refer to thefollowing steps:

1. Connect the test set to the span by plugging the RJ-45 cable(s),

or 3-pin banana into the test set and clip directly onto the cop-per pair with the alligator clips plug.

FEXT testing (SSMTT-25 or 26), use the MAIN and AUXports.

Insertion Loss, Signal-To-Noise (SSMTT-25 or 26), use theMAIN port.

Loop Resistance testing (SSMTT-26), use the MAIN port.

2. Press the keypad MODULE (xDSL) key and,

for the SSMTT-25, select RESPONDER from the W-TIMS MAINMENU and the screen shown in Figure 31 is displayed.

for the SSMTT-26, select RESPONDER from the RESPONDERMAIN MENU and the screen shown in Figure 31 is dis-

played.

3. The test set will now automatically respond to commands from

the Controller unit. You must remain in this screen to respondto commands. These cmmands and the units status are dis-

played on the screen in Figure 31.

Figure 31 Responder Mode


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The Responder Mode screen in Figure 31 displays three lines

of information:

LINE: Shows the connection with the Controller unit. LINE displays

IDLE (when its not receiving anything from the Controller) or CON-NECTED (when its receiving messages from the Controller).

COMMAND: Refers to the type of command received from the

Controller unit. Here, the Controller unit is running an InsertionLoss test.

STATUS: Shows the Responder units status. This can be ei-

ther:

Received: The test set received the command from the Con-troller unit.

Processing: The test set is in the process of responding to the

Controllers commands. Completed: The test set responded to the Controllers com-

mand.

4.2 Cable Pair Detect-SSMTT-26

The CABLE PAIR DETECT feature is to be used with a tone gen-erator at the far end of the cable pair for audible confirmation of

connectivity. Select CABLE PAIR DETECT and listen for an audibletone. The F1 and F2 keys can be used to adjust the volume. CablePair Detect can be used in conjunction wth another test set in TX

CABLE PAIR TONE mode at the far end of the cable.

Figure 32 Cable Pair Detect


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4.3 Tx Cable Pair Tone-SSMTT-26

The TX CABLE PAIR TONE feature is to be used with a tone de-

tector at the far end of the cable pair, for audible confirmation of

connectivity. The test set transmits a dual tone signal that can beaudibly detected by a tone detector, such as nother SSMTT-ACMin CABLE PAIR DETECT mode, at the far end of the cable pair.

Figure 33 Transmit Cable Pair Tone

5 Express Limited Warranty

This Sunrise Telecom product is warranted against defects inmaterials and workmanship during its warranty period. The war-

ranty period for this product is contained in the warranty page on

http://www.sunrisetelecom.com.Sunrise Telecom agrees to repair or replace any assembly orcomponent found to be defective under normal use during this

period. The obligation under this warranty is limited solely to re-pairing or replacing the product that proves to be defective within

the scope of the warranty when returned to the factory. This war-ranty does not apply under certain conditions, as set forth on thewarranty page on http://www.sunrisetelecom.com.

Please refer to the website for specific details.

THIS IS A LIMITED WARRANTY AND THE ONLY WARRANTYMADE BY SUNRISE TELECOM. SUNRISE TELECOM MAKES

NO OTHER WARRANTY, REPR SENTATION OR CONDITION,EXPRESS OR IMPLIED, AND EXPRESSLY DISCLAIMS THE

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESSFOR A PARTICULAR PURPOSE AND NON-INFRINGEMENTOF THIRD PARTY RIGHTS.


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Index

BBackground Noise; 10

Background Noise SetupRx LEVEL; 11TYPE; 11

Background Noise Tests, Other; 18Background Noise-TERM Mode; 14

bridge taps; 30

CConnector Panel; 6

Controller tests; 27

DDetecting Bridge Taps with Insertion Loss; 30

F

Far End Crosstalk; 34FEXT; 34Figures

01 SSMTT-25 Connector Panel; 602 SSMTT-26 Connector Panel; 6

03 SSMTT-25 W-TIMS Menus; 704 SSMTT-26 Responder Menu; 705 Single-ended Test-Main Port; 8

06 Single-ended Test-Main and AUX Ports; 807 Paired Tests-Main Port; 9

08 Paired Test-Main and AUX Port; 909 Connecting the Test Set to Tip and Ring; 10

10 Background Noise Setup Screen; 11

11 PSD Background Noise Results; 1212 Background Noise-TERM Mode; 14

13 Background Noise-BRIDGE Mode; 1614 Level Meter; 19

15 Frequency Generator; 2016 Impulse Noise Setup; 21

17 Impulse Noise Results; 2318 Longitudinal Balance Connections; 2419 Longitudinal Balance; 24

20 NEXT Connections; 2521 Near End Crosstalk; 26

22 NEXT Results, Table; 2623 Controller/Responder Dual Ended Test Setup; 27

24 ADSL PSD Insertion Loss Result; 2825 Insertion Loss, Table; 2926 Single Frequency Insertion Loss; 31

27 Signal-to-Noise Result for ADSL DMT PSD; 32


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Figures cont28 FEXT Connections; 34

29 Far End Crosstalk; 3530 FEXT Results, Table; 35

31 Responder Mode; 3632 Cable Pair Detect; 3733 Transmit Cable Pair Tone; 38

Frequency GeneratordBm; 20

FREQ; 20

IImpulse Noise; 21

Impulse Noise ResultsET; 23HIGH; 23

LOW; 23MID; 23

RT; 23Impulse Noise Setup

Dead Time; 22Delta; 22Max Count; 22

Threshold; 21Timer; 22

Insertion Loss; 27

LLEDs; 6

LineBackground Noise; 10

Controller Tests; 27Impulse Noise; 21Level Meter; 19

Near End Crosstalk; 25Single-ended line tests; 10

Line Measurements; 8Longitudinal Balance; 24

NNear End Crosstalk; 25

R

Responder TestingCOMMAND; 37

LINE; 37STATUS; 37

Completed; 37Processing; 37Received; 37


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SSDSL Connector Panel; 6

Signal to Noise Test; 32

Single Frequency Insertion Loss Tests; 31T

Tables01 Controller/Responder Testing Combinations; 5

02 Interferer Type; 15Testing Interferers in BRIDGE Mode; 16Testing Interferers in TERM Mode; 14

W

Warnings; 4Warranty; 38


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Documents

MAN-13891-US001_C00_MTT_25-26_W-TIMS_MMD