Viavi T-BERD 5800 Manuel utilisateur

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Viavi T-BERD 5800

CPRI Testing Guide with ALU BBU

Emulation

Version 4

January 2018

Firmware 26.0.0.6c1973b or Later REQUIRED!

Scope

This document describes Common Public Radio Interface (CPRI) testing procedures. This document

is intended to be a method of procedure (MOP) for configuring CPRI test setups, running tests,

analyzing results, and creating reports with the Viavi T-BERD 5800v2. This document is not intended

to be a user guide. This MOP should be used in conjunction with T-BERD User’s Guides for detailed

explanation of all testing options.

This document describes three test applications for the CPRI Check test: Verifying provisioning and

operation of CPRI Radio Equipment such as a Remote Radio Unit (RRU) unit

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1. Optical Time Domain Reflectometry (OTDR)

An OTDR sends thousands of very short pulses of light at designated wavelengths into the fiber under

test. It detects the amplitude and time delay of both the scattering and the reflection of the light as it

returns to the same interface. Through computations, an OTDR builds a picture of the loss

characteristics of the fiber throughout its path. It then asserts the location and nature of events such as

splices, bends, breaks, connectors and the fiber end. It also provides the aggregate loss of the fiber

from start to end.

An Insertion Loss test can tell you if a fiber run is performing acceptably. If it fails your threshold,

you do not know where the problem or problems are. An OTDR will tell you each and every

contributor to the losses incurred in the fiber system. Thresholds can be set not just for total loss (dB)

but for each contributing element.

Follow this procedure to set up a T-BERD 5800 to run the Optical Time Domain Reflectometer

(OTDR). The picture below is of a TBERD 5800v2 with a Single Mode OTDR module attached. The

post of the OTDR module is covered with a green dust protector indicating that an Angled Physical

Contact (APC) connector is used on the port.

USEFUL INFORMATION: It is important to know the fiber distance from the BBU connection to the

RRU connection. This is typically the length of the hybrid plus any jumpers. These parts are typically

purchased at some standard length. When you run the OTDR test, you want to see the Test Set declare

“End of Fiber” at a distance that correlates to the “as built” information for the system under test. A

declaration of “End of Fiber” before that length indicates a connection is still open or there is a fiber

break.

1.1 Test Setup

Step Action Details

1. Power On Press and hold the ON/OFF button to turn on the T-BERD 5800v2.

2. Select Test Select the Fiber Optics Tab at the top of the screen

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From the Home Screen , select FTTA OTDR (turns

Yellow)

Select the test tab and then the Setup button , then Load

Config in the lower right corner.

Select FTTA_RRU_ConstrLoop.SM-OTDR and Load as FTTA

Config

3. Clean & Inspect (IBYC) Ensure all test jumpers, the hybrid cable and the OTDR port are

clean using a Fiber Inspection probe and cleaning supplies. The

technician at the tower top should do the same with all connections

including the loopback cable.

4. Ensure continuity The VFL Continuity test should have been completed earlier and the 10-

meter loopback fiber left in place at the tower top.

5. Connect Connect the 10 meter SC-APC to LC-PC launch cable from the TB5800

OTDR port to the fiber pair under test using a duplex LC coupler. Also

connect a 10-meter “receive cable” to the other port on the duplex

coupler. This receive or run out cable will give the OTDR visibility to

the last connection that will part of the system. Optionally, place a non-

reflective terminator at the end of the receive cable. If you do not have

such, just make sure that the end of the fiber will be pointed safely away

so that there is no chance that the laser light could reach anyone’s eyes

either directly or by reflecting off a surface.

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6. Run the Test Touch the Start/Stop green button

The OTDR will take about 45 seconds to run a test at 1310 nm and

another at 1550 nm.

7. Interpretation Much like a sweep test on coaxial cable, the OTDR is looking for

reflective events along the path. It also detects Raleigh scattering along

the entire fiber which allows it to detect non-reflective events as well. It

presents the results in a graph and in a graphical form. Each connector

as well as the end of the fiber will be detected. Bends or kinks in the

fiber will show up as well. A broken or cut will be declared as “End of

Fiber”. Any events that exceed the thresholds should be investigated.

An “End of Fiber” that is clearly short of the “as built” records for this

site is actually a broken fiber that needs to be swapped or replaced.

Below is an example of a traditional Trace View. Each event is a peak

on the graph. Events that surpass a threshold will have RED values in

the table below.

The schematic on

the left shows the

path up and down

the tower

independently, but

the up/down paths

are really the 2

fibers in a fiber

pair with the

connectors aligned

side by side.

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The screen shot below is the same test result, but presented in a graphical

form instead of the traditional “trace” view.

Values in black are unjudged results

Values in Green have been assessed against a threshold and they Pass

Values in Red (none shown) have been assessed against a threshold and

they failed. Investigate any values in red. If it is a connector, re-inspect

and clean if necessary and re-run the test.

Note the symmetry in the Trace View. There is 10 meters of launch and

receive cable at the 2 ends. The Hybrid cable was 25 Meters long. The

jumper from the end of the Hybrid to the RRU was 10 meters. The

loopback cable that loops the end of the RRU jumper is also 10 meters.

Every successful test should look similar to this one. The main

differences might be that the Hybrid and/or RRU jumper is different

from the previous.

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2. Verifying provisioning of an RRU with RF over CPRI Spectrum

Analysis

Follow this procedure to set up a T-BERD and test a CPRI link and RRU, and perform RF over CPRI

Spectrum Analysis for PIM detection and Diversity Imbalance. The test may be run on dark fiber or

through Layer 1 network elements such as transponders and multiplexors. The CPRI Radio Equipment

should be installed at the far end on the link before testing.

Note: This is a dual port application. Port 1 is used by default

Step Action Details

1. Power On Press the ON/OFF button to turn on the T-BERD.

2. Insert SFP Insert an SFP or SFP+ that supports the Wavelength, CPRI rate and

range of the line under test into the T-BERD 5800v2’s Port 1 SFP+ slot.

Note: All SFPs do not support CPRI. Use a Viavi approved CPRI

SFP (see Appendix A) or one approved by your CPRI network

equipment manufacturer.

3. Clean & Inspect Ensure that fiber and connectors are clean using a Fiber Inspection

probe.

4. Connect Connect the SFP or SFP+ to the CPRI port under test using

yellow Single Mode Fiber jumper cables (LC-LC).

You may need to attenuate the signals if you are using a

long range SFP/SFP+.

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5. Test Menu Press the button to access the BBU Test

6. Launch Test Select the CPRI Check ALU BBU Emulation test for the proper rate

(usually 4915.2M)

7. Manual Launch If the above tests are not loaded on the 5800 follow the next steps to

launch the CPRI Check for ALU BBU Emulation.

From the menu, select CPRI>>RATE>>CPRI

Check>>P1 Terminate

8. NOTE: The test will launch on PORT 1 UNLESS there is already a test running

Verify the port in the upper right-hand corner of the screen

If needed move the SFP to port 2 as shown on the previous page

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4. Creating a New RRH Configuration

Step Action Details

1. Select Tests Press the button to Start a new Configuration

Select ALU for the “Far-end Device” (default) and check to test needed

for BBU Emulation

Press the button to advance to the Link page

2. Link values Set the test duration and SFP power if desired

Press the button to advance to the RRH page

3. RRH Settings Click the RRH Bandwidth drop down box and

select the Bandwidth needed

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4. Antenna Test Select the Transmit Antenna to test

5. Waveform Set the Waveform to LTE-FDD TM3.1 (NOTE TM3.1 is required for

FULL OCNS channels to test VSWR and PIM)

6. Return Press the button to proceed to the Save Profile screen

7. Save Profile To save the configuration in the Save Profiles screen, enter a Filename,

and tap , tap , and tap twice.

8. Continue After saving the profile Press the press the arrow to

advance to the test screen

GOTO Section 2 BBU Emulation

Loading a saved Configuration

1. Run Wizard Load a save configuration by pressing the button under the “Load

Configuration from a Profile” area

NOTE: If a configuration for the RRH does NOT exist, proceed Section

4 Creating a New RRH Configuration

Select the configuration and press the button

Press the button to accept the configuration

Press the button to advance to the next screen

GOTO Section 2 BBU Emulation (Next page)

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2. BBU Emulation

Running the Test

Step Action Details

1. Launch Press the button to start the test

2. SFP Verification In the Local SFP Verification screen, verify that the SFP meets the

requirements of the line under test.

If the SFP was purchased from or approved by Viavi, and supports the

selected CPRI line rate, the following screen will be displayed:

Tap to proceed to step 5.

If the SFP was sourced from your CPRI Network Equipment

Manufactured and has not been tested and approved by Viavi, the

following screen will be displayed:

Check that the SFP Wavelength, SFP Vendor, and SFP Part Number are

approved for this CPRI line rate. Tap to proceed.

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