G.8262 SyncE Umanual SC299625

Calnex Solutions Ltd Page 1 of 40

Reg. SC299625

G.8262 SyncE Conformance Testing

Applications User Guide

1. Hardware and Software required .............................................................................................................. 2

2. Connecting an EEC to the Paragon-X ......................................................................................................... 3

3. How to Configure the Paragon-X for ALL G.8262 Tests ............................................................................. 5

4. Measuring Frequency Accuracy G.8262 Section 6 .................................................................................. 8

5. Pull-in, Hold-in, and Pull-out ranges G.8262 Section 7 ......................................................................... 10

6. Wander (Noise) Generation G.8262 Section 8 ..................................................................................... 13

7. Jitter Generation G.8262 Section 8.3 .................................................................................................... 16

8. Wander (Noise) Tolerance G.8262 Section 9 ........................................................................................ 17

9. Jitter Tolerance G.8262 Section 9.2 ...................................................................................................... 22

10. Wander (Noise) Transfer G.8262 Section 10 ........................................................................................ 23

11. Phase Transient Response G.8262 Section 11 ...................................................................................... 31

12. Appendix 1 - G.8262 Testing; Practical interpretation guidance ............................................................. 36


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1. Hardware and Software required

Paragon-X

o Option 110 GbE electrical and Optical

o Option 111 10GbE interface (optional)

o Option 120 Delay and Header Capture

o Option 213 SyncE measurements

o Option 223 MTIE/TDEV internal wander generation

o Paragon- X Software X.10.14 or higher

Synchronisation (Reference) Frequency Source


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2. Connecting an EEC to the Paragon-X

The front panel of the Paragon-X provides the following interfaces for testing:

1. 100MbE Electrical or Optical (SGMII SFP)

2. 1GbE Electrical or Optical (SFP) with option 110 fitted

3. 10GbE Optical (XFP or SFP+) with option 111 fitted

Paragon-X Front Panel Connections

10GbE Port 1

100MbE/1GbE Port 1

10GbE Port 2

100MbE/1GbE Port 2

Status Display

PC Controller Port


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The Paragon-X accepts the following reference clocks which should be applied to one of the

Reference Inputs on the back panel:

1. 2.048MHz

2. 10MHz

3. E1 (2.048Mb/s)

4. DS1 (T1) (1.544Mb/s)

Fig. 1 Paragon-X Reference Inputs (Back Panel)

There are two reference inputs

BNC with 75 impedance (the connector on the left in the figure).

Bantam connector with 100 impedance.

o 3 pole bantam jack o 4.39mm Diameter o Tip; Positive, Ring; Negative, Sleeve; Ground


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3. How to Configure the Paragon-X for ALL G.8262 Tests

a) Verify your physical connections have been completed per section 2.

b) Start the Paragon-X GUI

c) Select the Operating Mode button.

d) Select Sync-E then select Close

e) Click Setup Interface and then Physical Settings.


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f) Verify that the SyncE Clock Rx > Tx is not checked

g) Select the reference clock source.

h) Select the line rate and Electrical/Optical (100M/1GbE/10GbE).

Note: If using SFPs, XFPs or SFP+s, BOTH Port 1 and Port 2 optical transceivers must be

inserted into the Paragon-X.

i) Select the Close button to close the Physical Settings window, and then select Close again to

close the setup interface window.

Note: once you have selected Sync-E mode, the Paragon-X GUI will display SYNCE LOCK as grey

(This verifies that the SyncE Rx > Tx box is unchecked).

ESMC Generation

Ethernet Synchronisation Message Channel (ESMC) is a Point to Point Protocol in which each EEC

generates and terminates an ESMC PDU. This ESMC PDU is normally transmitted once per second

on the Slow Protocol Channel and contains the Quality Level (QL) TLV of the associated clock . The

receiving EEC uses this QL to select the best quality clock. The EEC then regenerates the ESMC


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PDU with the appropriate QL TLV value to indicate the quality of the clock being transmitted to the

next EEC.

If the EEC supports ESMC, it is possible for the Paragon-X to use this functionality to indicate if an

EEC switches clock reference or goes into holdover.

The Paragon-X can generate ESMC messages on both Ports 1 and 2. For G.8262 conformance

testing, ESMC messages are generated on Port 2 with a used defined Quality Level (QL) such as

PRC.

a) Generate ESMC messages by selecting button. The following window will open.

b) Check the box Enable TX+Rx Mode

c) Select Port 2 tab (the output from the Paragon and input to EEC)

d) Select SSM code QL-PRC, which tells the EEC that the clock from the Paragon-X is of PRC quality.

e) Set rate to 1000mS.

f) Click and then

g) The ESMC Generation button will go red to indicate the Paragon-X is generating ESMC packets.

After any setup changes to the Paragon-X, please ensure the EEC has had time to settle

before making any measurements


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4. Measuring Frequency Accuracy G.8262 Section 6

Input Stimulus Pass/Fail Criteria Notes

EEC Option 1

Free run +/- 4.6 ppm

Recommend to test for

an hour, longer if close

to limits

EEC Option 2

Hold over +/- 4.6 ppm

Recommend to test for

an hour, longer if close

to limits

Measurement Setup a) Connect the EEC to Paragon-X to EEC as shown above

b) Set up the Paragon-X GUI as per Section 3.

Measurement Process

a) Select the Start Capture button to start measurement.

b) To stop the measurement after a pre-defined period for running the test, select Stop Capture

button.


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c) Paragon-X will provide the ppm frequency accuracy at the bottom of the graph in red text (as shown

in the screen shot at the top of the next page).


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5. Pull-in, Hold-in, and Pull-out ranges G.8262 Section 7

Pullin Range (G.8262 Section 7.1) The Pull-in range is defined as the largest offset between a slave clock's reference frequency and a

specified nominal frequency, within which the slave clock will achieve locked mode.


EEC

Option 1

and

EEC

Option 2

Apply a large Frequency

offset ensuring EEC is in

holdover. Reduce offset

until EEC locks.

EEC starts unlocked with large offset applied

EEC locks before offset reaches +/- 4.6ppm

Lock can also be

monitored by using

ESMC (if supported)

Holdin Range (G.8262 Section 7.2) Hold-in range is defined as the largest offset between a slave clock's reference frequency and a

specified nominal frequency, within which the slave clock maintains lock as the frequency varies

arbitrarily slowly over the frequency range.


EEC

Option 1 Not Applicable

EEC

Option 2

EEC is locked to the clock

from the Paragon-X. The

Frequency is then offset

to +/-4.6ppm

EEC should remained locked at an offset at +/-4.6ppm

Lock can also be

monitored by using

ESMC (if supported)


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Pullout Range (G.8262 Section 7.3) Pull-out range is defined as the offset between a slave clock's reference frequency and a specified

nominal frequency, within which the slave clock stays in the locked mode and outside of which the

slave clock cannot maintain locked mode, irrespective of the rate of the frequency change.


EEC

Option 1




until the EEC unlocks

EEC should remain locked at an offset at +/-4.6ppm but lock should extend beyond this.

G.8262 states this is for

further study

EEC


Measurement Setup a) Connect the EEC to Paragon-X to EEC as shown in the diagram at the beginning of this section

b) Set up the Paragon-X GUI as per Section 3, including setting up ESMC with QL=PRC if using ESMC

to monitor which clock the EEC is locked to.

Measurement Process

a) select the Start Capture button to start measurement.

b) Select the Wander and Jitter Generation button. The Frequency Offset window will appear


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c) In the Frequency Offset window, add the Frequency Offset required and click the Apply Offset

button

d) To remove the Frequency Offset and return it back to 0ppm click the Remove Offset

button

e) To stop the measurement after a pre-defined period for running the test, select Stop Capture

button.

f) The Paragon-X TIE graph indicates if the EEC is in or out of lock as shown in the screenshot below


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6. Wander (Noise) Generation G.8262 Section 8

Input Stimulus Pass/Fail Criteria

Notes

(G.8262 masks)

EEC Option 1

(Constant Temp)

- Locked Mode

- Wander Free reference

- Constant temperature

MTIE & TDEV Pass/Fail masks shown in G.8262 Section 8.1.1

MTIE Table 1/ Figure 1

TDEV Table 3/ Figure 2

EEC Option 1

(Temp effects)

- Locked Mode


- Temperature effects

MTIE Pass/Fail masks shown in G.8262 Section 8.1.2.


TDEV G.8262 states

for further study

EEC Option 2

(Constant Temp)

- Locked Mode






G.8261 Section 8.2 also mentions measurements in Non-locked mode and refers to section 11.2

Long-term phase transient response (Holdover) and will not be covered in this section.

Measurement Setup a) Connect the EEC to Paragon-X to EEC as shown in the diagram at the beginning of this section

g) Set up the Paragon-X as described in section 3, including setting up ESMC with QL=PRC if using

ESMC to monitor which clock the EEC is locked to.

Measurement Process

a) Select the Start Capture button to start measurement.


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b) To stop the measurement, select Stop Capture. . It is suggested that the test

should run for approx 3,000 seconds

c) The graph will show the captured TIE

d) To display the MTIE and TDEV graphs click on the bottom right hand side of the

graph and then MTIE/TDEV Analysis from the displayed menu.

e) A separate window will open showing the TIE in graphical form at the top, with an MTIE/TDEV

graph at the bottom.


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f) The MTIE/ TDEV analysis can be carried out against the G.8262 masks for Wander Generation

which can be selected from the measurement mask pull down selection in the left hand window.

g) Pass/Fail indication against the masks is shown also in this left hand window and will have a

green background for Mask Pass and a red background for Mask Fail


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7. Jitter Generation G.8262 Section 8.3

Testing Jitter generation is planned for a future Paragon-X release


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8. Wander (Noise) Tolerance G.8262 Section 9


EEC Option 1

MTIE Wander

Table 7/Figure 5

TDEV Wander

Table 8/Figure 6

Sinusoidal Wander

Table 9/Figure 7

The EEC is;

i. Maintaining the clock within performance limits.

ii. Not causing any alarms.

iii. Not causing the clock to switch reference.

iv. Not causing the clock to go into holdover.

To Check whether the

EEC is switching

references or going

into holdover, the

Paragon can measure

the wander and/or

ESMC QL of the EEC

output.

EEC Option 2

TDEV Wander

Table 10/Figure 8

The EEC is;.

i. Maintaining the clock within performance limits

ii. Not causing any alarms.

iii. Not causing the clock to switch reference.

iv. Not causing the clock to go into holdover.


EEC is switching

references or going

into holdover, the

Paragon can measure

the wander and/or

ESMC QL of the EEC

output.

Measurement Setup

a) Connect the EEC to Paragon-X to EEC as shown in the diagram at the beginning of this section

b) Set up the Paragon-X as described in section 3, including setting up ESMC with QL=PRC if using

ESMC to monitor if the EEC is switching clock references or going into holdover.


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Measurement Process

a) Select the Wander and Jitter Generation button on the Paragon-X GUI.

b) The Following window will now be open.

c) Select the Wander Tolerance Tab and the following window will open

d) There are three methods of generating wander into the EEC:

i. MTIE/TDEV modes Fastest and most effective way to evaluate EEC

ii. Table (Sine) Wander Can be used for finding Maximum Tolerable Wander

iii. Single (Sine) Wander Can be used for troubleshooting


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e) MTIE/TDEV Wander

The Paragon-X generates MTIE and TDEV wander as defined in G.8262.

i. Select the wander mask required from the drop down list. The mask and the maximum

running time will be shown on the right hand side of the window.

G.8262 Option 1 MTIE - Running Time is 1000s

G.8262 Option 1 TDEV - Running Time is 12000s

G.8262 Option 2 TDEV - Running Time is 12000s

ii. Click Generate Wander to start the test. The elapsed time will be displayed on the bottom

right hand side of the window.

iii. The test will stop after the max Running time has reached, the test can also be stopped

manually by clicking Stop Wander.

f) Table (Sinusoidal)

Can be used to test Maximum Tolerable Wander


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The user can enter up to 10 different wander parameter sets in the table. The Paragon-X will then

automatically add each of the specified wander sets in turn giving full indication of progress in the

Status column. Switching between the different sets is always done at a zero crossing to prevent

phase steps.

i. Enter the frequency, amplitude, and dwell time (number of cycles the frequency/amplitude

pair will be run) for each wander test point.

The same frequency with different amplitudes can be entered to find maximum

tolerable wander

The Restore Defaults button when checked will restore the values to that defined in

table 9 in G.8262.

Only rows that have the enable check box ticked will be executed in the test. To

skip over a selection, un-tick the enable box for that selection.

ii. Click Generate Wander to start the test

iii. Click Stop Wander to stop the test. The test will terminate at the next zero crossing

iv. A pop up box stating how long to the next zero crossing is displayed, click the Stop

v. Immediate button if it is desired to stop the test instantly.

g) Single Sinusoidal Wander

Can be used for troubleshooting issues at a specific frequency

i. Enter the frequency and amplitude of the desired wander

ii. Click Generate Wander to start the test

iii. Click Stop Wander to stop the test. The test will terminate at the next zero crossing of the

wander frequency

A pop up box stating how long to the next zero crossing is displayed.


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h) G.8262 states that with the wander applied that the EEC should

i. Maintain the clock within the prescribed performance limits (the exact performance limits are

for further study)

ii. Not cause any alarms

iii. Not cause the clock to switch references

iv. Not cause the clock to go into holdover

For further insight, use the Paragon-X ESMC generation/capture capability and TIE graph to

check whether the EEC is switching clock reference or going into holdover.

i) Ensure the Paragon-X has been set up to Generate ESMC messages with QL=PRC as described

in section 3 of this document.

j) Select the Start Capture button to start the measurement.

k) To show both the TIE and ESMC graph at the same time click and then Show 2nd

Graph and then select ON

l) To change what a graph is displaying,

i. click one of the graphs (the selected graph will be non-Grey

ii. Click and then Graph Display Mode, finally select the graph to display

Time Interval Error (TIE) vs Nominal

ESMC Rx Quality vs Time: (Port 1 Rx)

The screenshot above shows an EEC that has switched references or gone into holdover (top graph

is ESMC, bottom graph shows the difference in Frequency between the reference and the recovered

clock from the EEC)

m) To stop the measurement, select Stop Capture.


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9. Jitter Tolerance G.8262 Section 9.2

Testing Jitter tolerance is planned for a future Paragon-X release


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10. Wander (Noise) Transfer G.8262 Section 10


EEC Option 1 Not defined The phase gain of the EEC should be smaller than 0.2 dB (2.3%).

There is no definition of the

input stimulus to be used in

G.8262. Without further

guidance from the Standards,

it is suggested that the

amplitude and frequency

values associated with mask

points labelled f1, f2 & f3 on

G.8262 Section 9.1.1, Table 9

& Figure 7 are used.

EEC Option 2

TDEV Wander

Table 10/Figure 8

Measure EEC output against TDEV Pass/Fail masks shown in G.8262 Section 10..2 Table 13/Figure 11

Measurement Setup


b) Set up the Paragon-X as described in section 3, including setting up ESMC with QL=PRC if using

ESMC to monitor which clock the EEC is locked to.


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Measurement Process

a) Select the Wander and Jitter Generation button on the Paragon-X GUI.

b) The Following window will now be open.

c) Select the Wander Transfer Tab and the following window will open


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G.8262 Option 1 Wander Transfer Test: Paragon-X automated testing

a) Select the G.8262 Option 1 tab and then the Table tab.

b) Enter the frequency, amplitude, and dwell time (number of cycles the frequency/amplitude pair will be

run) for each wander test point.

i. The Restore Defaults button when checked will restore the values to that defined in table 9 in

G.8262.

ii. Only rows that have the enable check box ticked will be executed in the test. To skip over a

selection, un-tick the enable box for that selection.

c) To calibrate the Paragon-X, connect a short Ethernet cable between Port 1 and Port 2 and click the

button.


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d) When the calibration is finished the Status window will show

e) Remove the short Ethernet cable between Port 1 and Port 2 and connect the EEC under test as

shown in the setup diagram at the start of this section.

f) Click the Generate Wander button to start the test.

g) The Paragon-X will show the status of the test, the measured Gain (dB) value and also a Pass/Fail

indication on the right hand side of the window.


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G.8262 Option 1 Wander Transfer Test: Paragon-X single frequency test

This capability can be used for fault finding issues at specific frequencies

a) Select the G.8262 Option 1 tab and then the Single tab.

b) Enter the frequency and amplitude of the wander to be generated

c) To calibrate the Paragon-X, connect a short Ethernet cable between Port 1 and Port 2 and click the

button.

d) When the calibration is finished the Status window will show

e) Remove the short Ethernet cable between Port 1 and Port 2 and replace with the EEC under test.


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f) Click the Generate Wander button to start the test.

g) The GUI will show the estimated completion time at the bottom of the screen. The measured Gain

(dB) value and also a Pass/Fail indication (Green/Red background) will be displayed.


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G.8262 Option 2 Wander Transfer Test:

a) Select the G.8262 Option 2 tab.

b) Press Generate Wander button to start the test.

c) The amount of the time until completion of the test is shown at the bottom right hand side of the

screen.

d) At any time during the test, it is possible to view an updated output TDEV graph by clicking the

TDEV Results button. The TDEV graph will then be displayed.


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e) At the end of the test the Paragon-X will automatically show the final MTIE graph and show Pass/Fail

against the MTIE mask.


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11. Phase Transient Response G.8262 Section 11


EEC Option 1

EEC input reference is lost for 15 seconds and a 2nd reference input signal, traceable to the same reference clock, is available simultaneously

Maximum phase transient at the output due to reference switching to meet mask in G.8262 Figure 12

To emulate the loss of the

link either

Change ESMC

QL=DNU

Remove the cable

between port 2 and

EEC

EEC Option 2

EEC input reference

is lost for 15 seconds

and a 2nd reference

input signal, traceable

to the same reference

clock, is available

simultaneously

EEC output should meet MTIE mask defined by table 15/ Figure 14 in section 11.4.2 of G.8262


link either:

Change ESMC

QL=DNU

Remove the cable

between port 2 and

EEC

Measurement Setup


b) Set up the Paragon-X as described in section 3 (including ESMC generation if using the ESMC

method of switching clock references, ensuring SSM code is set to PRC)

c) Select Configure Capture , select 10mSecs sample period and then close.


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Measurement Process

a) There are two methods for determining Phase Transient Response with the Paragon-X;

i. Use ESMC Generation (if supported by the DUT).

ii. Remove the link between Port 2 on the paragon-X and the EEC input port.

b) Select the Start Capture button to start measurement.

c) If using the Ethernet cable removal method.

d) If using ESMC method

i. Select button. The following window will open

ii. Ensure SSM code is set to QL PRC

iii. In the SSM Code drop down menu select QL DNU/DUS and then click .

e) To stop the measurement click Stop Capture. .


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Measuring Results

The switching transient will be seen on the Paragon-X TIE graph.

The Paragon-X graphs can show the TIE and also the ESMC QL for each port

In the screenshot bellow the ESMC graph shows the time and QL change of the ESMC transition on

Port 2 Tx of the Paragon-X. This can then be compared in time to the TIE graph showing the

Transient.

Method of evaluating the capture for phase transient response is dependent upon whether EEC Option

1 or Option 2 is being evaluated.

EEC Option 1

a) To view the output TIE for EEC Option 1, closely monitor the output TIE graph on Paragon-X for the

duration (15s) of the test. While the slave clock is acquiring the new reference, the output phase

transient should be within the limits of figure 12 of G.8262 (provided below)


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EEC Option 2

a) To view the output MTIE mask for EEC Option 2 ONLY, perform the following:

b) To display the MTIE and TDEV graphs click on the bottom right hand side of the TIE

graph and then MTIE/TDEV Analysis from the displayed menu.

c) A separate window will open showing the TIE in graphical form at the top, with an MTIE/TDEV graph

at the bottom.

d) The MTIE analysis can be carried out against the G.8262 masks for Wander Transient which can

be selected from the measurement mask pull down selection in the left hand window.


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e) Pass/Fail indication against the masks is shown also in this left hand window and will have a green

background for Mask Pass and a red background for Mask Fail


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12. Appendix 1 - G.8262; Practical interpretation guidance

Frequency Accuracy G.8262 Section 6


EEC Option 1

Free run +/- 4.6 ppm

Recommend to test

for an hour, longer if

close to limits

EEC Option 2

Hold over +/- 4.6 ppm

Recommend to test

for an hour, longer if

close to limits

Pullin Range (G.8262 Section 7.1)


EEC

Option 1

and

EEC

Option 2

Apply a large Frequency

offset ensuring EEC is in

holdover. Reduce offset

until EEC locks.

EEC starts unlocked with large offset applied

EEC locks before offset reaches +/- 4.6ppm

Lock can also be

monitored by using

ESMC (if supported)

Holdin Range (G.8262 Section 7.2)


EEC


EEC

Option 2




to +/-4.6ppm

EEC should remained locked at an offset at +/-4.6ppm

Lock can also be

monitored by using

ESMC (if supported)


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Pull out Range (G.8262 Section 7.3)


EEC

Option 1




until the EEC unlocks.

EEC should remain locked at an offset at +/-4.6ppm but lock should extend beyond this.

G.8262 states this is for

further study

EEC


Wander Generation (G.8262 Section 8)


EEC Option 1

(Constant Temp)

- Locked Mode






EEC Option 1

(Temp effects)

- Locked Mode


- Temperature effects

MTIE Pass/Fail masks shown in G.8262 Section 8.1.2.


TDEV G.8262 states

for further study

EEC Option 2

(Constant Temp)

- Locked Mode







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Wander Tolerance (G.8262 Section 9)


EEC Option 1

MTIE Wander

Table 7/Figure 5

TDEV Wander

Table 8/Figure 6

Sinusoidal Wander

Table 9/Figure 7

The EEC is;

v. Maintaining the clock within performance limits.

vi. Not causing any alarms.

vii. Not causing the clock to switch reference.

viii. Not causing the clock to go into holdover.


EEC is switching

references or going

into holdover, the

Paragon can measure

the wander and/or

ESMC QL of the EEC

output.

EEC Option 2

TDEV Wander

Table 10/Figure 8

The EEC is;.

v. Maintaining the clock within performance limits

vi. Not causing any alarms.

vii. Not causing the clock to switch reference.

viii. Not causing the clock to go into holdover.


EEC is switching

references or going

into holdover, the

Paragon can measure

the wander and/or

ESMC QL of the EEC

output.

Wander Transfer (G.8262 Section 10)


EEC Option 1 Not defined The phase gain of the EEC should be smaller than 0.2 dB (2.3%).

There is no definition of the

input stimulus to be used in

G.8262. Without further

guidance from the Standards,

it is suggested that the

amplitude and frequency

values associated with mask

points labelled f1, f2 & f3 on

G.8262 Section 9.1.1, Table 9

& Figure 7 are used.

EEC Option 2

TDEV Wander

Table 10/Figure 8

Measure EEC output against TDEV Pass/Fail masks shown in G.8262 Section 10..2 Table 13/Figure 11


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Transient Response (G.8262 Section 11)


EEC Option 1

EEC input reference is lost for 15 seconds and a 2nd reference input signal, traceable to the same reference clock, is available simultaneously

Maximum phase transient at the output due to reference switching to meet mask in G.8262 Figure 12


link either

Change ESMC

QL=DNU

Remove the cable

between port 2 and

EEC

EEC Option 2

EEC input reference

is lost for 15 seconds

and a 2nd reference

input signal, traceable

to the same reference

clock, is available

simultaneously

EEC output should meet MTIE mask defined by table 15/ Figure 14 in section 11.4.2 of G.8262


link either:

Change ESMC

QL=DNU

Remove the cable

between port 2 and

EEC

For more information on the Calnex Paragon-X and to take advantage of Calnexs extensive experience in

sync and packet testing technologies, please contact Calnex Solutions on +44 (0) 1506 671 416 or email:

[email protected]

Calnex Solutions Ltd Herkimer House Mill Road Enterprise Park Linlithgow West Lothian EH49 7SF United Kingdom Tel: +44 (0) 1506 671 416 Email: [email protected]

www.calnexsol.com

This information is subject to change without notice

Calnex Solutions Ltd, 2010

Documents

G.8262 SyncE Umanual SC299625