Viavi T-BERD MTS 5800 Stücklistenhandbuch

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T-BERD®/MTS-5800 Network Tester

Enabling the GNSS/GPS Receiver for Sky Plot, One-Way

Delay, and Sync Measurements

This document outlines how to set up a GPS/GNSS Receiver on a T-BERD/MTS-5800 test instrument.

Equipment Requirements:

•One of the following T-BERD/MTS-5800

models:

oT-BERD 5800-100G equipped with

GNSS Timing and Location option

(VIAVI Part# C5GNSS)

oT-BERD 5882 equipped with

GNSS Timing and Location option

(VIAVI Part# C5GNSS)

oT-BERD/MTS-5800v2 equipped with

Timing Expansion Module

(VIAVI Part# C5TEM-R)

•BERT software release V27.0 or greater

•GNSS Antenna (Taoglas AA.171, VIAVI

Part# C5ANTENNA)

Connect the GNSS Antenna:

1. Connect the male SMA connector on the

end of the antenna cable to the female

SMA connector on the T-BERD/MTS-5800

(labeled Antenna).

2. Tighten the connector until the antenna is

securely attached.

3. Place the antenna in a location with

minimum interference or blocking.

Figure 1: Equipment Requirements

Figure 2: T-BERD/MTS-5882

Figure 3: T-BERD 5800-100G

Figure 4: T-BERD 5800v2 with TEM

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Enable GNSS Receiver and Complete Survey:

1. Press the Power button to turn on the

test set.

2. Tap the Test icon .

3. Tap the Internal GNSS tab or

the Timing Source tab .

4. Tap the Setup soft key .

5. Configure GNSS Settings as follows:

•GNSS System: GPS+GLAONASS+BSAS

•Time Type: GPS

•Time Format: 12-hour

Figure 5: GNSS Setup

•Elevation Limit: 15 deg recommended, 5 deg minimum. Using satellites near the horizon may

degrade performance.

•Minimum C/No: 30 dB-Hz recommended, 9 dB-Hz minimum. Using satellites with a weak carrier to

noise ratio may degrade performance.

•Antenna Power: 3.3 volts for VIAVI supplied Taoglas AA.171 antenna. If you are using a different

antenna, enter the antenna power.

•Antenna Time Bias: 28 ms for VIAVI supplied Taoglas AA.171 antenna. If you are using a different

antenna, enter the cumulative delay introduced by the antenna, the cables, and any in-line splitters or

amplifiers.

6. Tap the Location settings tab .

7. Configure Location Settings as follows:

•Survey mode: Typical (3 hours)

recommended for best accuracy. Fast

or Quick may be used, but timing

accuracy is reduced.

8. Tap the Start Survey button to

start a survey.

9. Tap the Results soft key to view the

Test Result screen.

10. If you are using a T-BERD 5800v2 and

Timing Module (C5TEM-R), tap the

Rubidium Osc. button to turn on

and tune the oscillator.

Figure 6: Location Setup

Figure 7: Test Results Screen, T-BERD 5800v2

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(+1 844 468 4284)

To reach the VIAVI office nearest you,

visit viavisolutions.com/contacts.

Product specifications and descriptions in this

document are subject to change without notice.

11. Using the results group and category drop-

down menus, change the right results

display to the following:

•Satellites/Sky Plot: Displays the

satellites that are identified using

the GNSS receiver. Ensure at least 4

satellites are “Used”. Otherwise,

relocate antenna to a less

obstructed location.

•Satellites/Signal Strength: Displays

the signal strength for each

identified satellite. Ensure signal

strength of used satellites exceeds

Minimum C/No setting. Otherwise,

reduce Minimum C/No setting.

•GNSS/Status: Displays general

information concerning the GNSS

Satellites. Ensure that Status

progresses from “No Lock”to

“Locked” to “Fixed Position” during

the survey. Ensure that Timing

Mode Status progresses from

“Survey” to “Survey Done”.

Note: If you are using a T-BERD 5800v2

and Timing Module (C5TEM-R), the

Summary LED and Summary/Status

results display will remain red until the

rubidium oscillator is tuned.

12. Once the survey is done (and the oscillator

is tuned if using TEM), you are ready to

perform timing tests using the attached

antenna, including:

•One-way delay measurement

•IEEE 1588 Precision Time Protocol

(PTP) Time Error, Asymmetry, and

Packet Delay Variation (PDV)

measurements.

•Wander analysis

•Timing and 1PPS Analysis

Figure 8: Satellites/Sky Plot results

Figure 9: Satellites/Signal Strength results

Figure 10: GNSS/Status after survey (Internal GNSS)

Figure 11: GNSS/Status after survey & course tune (Timing Module)

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