Viavi T-BERD MTS 5800 Parts list manual

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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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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)