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Quick Card

T-BERD 5800 Network Tester

C37.94 Bit Error Rate Testing (BERT)

This quick card describes how to configure and run a C37.94 Optical Bit Error Rate Test to a hard loop

or another similarly configured T-BERD/MTS 5800.

Equipment Requirements:

•T-BERD 5800 equipped with the following:

oBERT software release V27.2 or

greater

oC5C3794 ITU C37.94 Optical BERT

option

oC37.94 capable optical transceiver

(SFP) to match the line under test

•Patch cables to match the optical

transceiver and the line under test

•Fiber optic inspection microscope

(P5000i or FiberChek Probe)

•Fiber optic cleaning supplies

Figure 1: Equipment Requirements

The following information is required to complete the test:

•Clock Source (Internal or Recovered)

•Data Rate (Number of 64K Channels)

•Test Pattern(s)

•BER Pass/Fail Threshold

Fiber Inspection Guidelines:

•All fiber end-faces must be clean and pass an

inspection test prior to connection.

•Use the VIAVI P5000i or FiberChek Probe

microscope to inspect both sides of every

connection being used (SFP Port, bulkhead

connectors, patch cords, etc.)

Figure 2: Inspect Before You Connect

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Connect to Fiber Under Test:

1. Insert C37.94 optics into the Port 1

SFP/SFP+ slot on the top of the

T-BERD/MTS.

2. After inspecting the fiber end faces, connect

the C37.94 optics to the fiber under test

using an LC-LC jumper cable.

Figure 3: T-BERD/MTS 5800v2 Dual Port mainframe

Launch and Configure Test:

1. Press the Power button to turn on

the test set.

2. Press the Test icon at the top of

the screen.

3. Using the Select Test menu, Quick Launch

menu, or Job Manager, launch the C37.94

BERT►P1 Terminate test.

Figure 4: Launch Screen

4. Tap to open the Tools Panel and

select .

5. Press to continue.

6. Press the Setup Soft Key, , on the

top right side of the screen.

Figure 5: Tools Panel

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7. Review the displayed SFP information to

verify that the correct optics are installed.

8. Select the Signal folder and configure the

Clock Source:

•Select Internal if the T-BERD/MTS is

to provide clock to the Multiplexor

•Select Recovered if the Multiplexor is

providing clock to the T-BERD/MTS.

•Note: Only one device on the C37.94

circuit should be set to provide

internal clock. Multiple Clocks will

cause intermittent Bit/TSE Errors and

Patterns Slips.

Figure 6: Signal Setup

9. Tap Payload to display data rate settings.

10. Enter the value for N, the number of 64K

channels on the interface (1 through 12).

11. Press the Results Soft Key to view the

Test Results screen.

Figure 7: Payload Setup

12. Using the drop-down menus, select

“Payload/BERT” for the right Results

display.

13. Select the Laser tab in the Actions panel,

and tap . The button will turn

yellow and be relabeled .

14. Press the Restart soft key .

15. Verify the following:

•Signal Present LED is green

•Frame Sync LED is green

•Pattern Sync LED is green

•Summary/Status results shows

‘ALL SUMMARY RESULTS OK”

Figure 8: Results

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you, visit viavisolutions.com/contacts.

Product specifications and descriptions in this

document are subject to change without notice.

16. Allow the test to run for desired duration

and verify the following:

•Bit/TSE Error Rate result does not

exceed your required threshold.

(0.00E+00 if pass/fail threshold

unknown)

Figure 9: Test Results Screen, Payload/BERT

17. In the T-BERD/MTS’s Quick Config menu,

change “Pattern” to the next value in the

test plan.

18. Press the Restart soft key to reset

results.

19. Allow test to run for desired duration and

verify the following:

•Pattern Sync LED is green.

•Bit/TSE Error Rate does not exceed

your required threshold. (0.00E+00 if

pass/fail threshold unknown)

Figure 10: Test Plan

20. Repeat steps 17 through 19 for all Patterns in the test plan. Patterns may include:

•QRSS

•All Zeros

•Delay

Simulates live traffic

Tests for DS1 channels mis-optioned for AMI

Measures Round Trip Delay (RTD) instead of Bit Errors (RTD

values are shown instead of BER in the “Payload/BERT” results

display)

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