Juniper Day One+ ACX7024 Manuel utilisateur
Grand Master Clock Support Using External GNSS
Receiver for ACX7024
IN THIS GUIDE
About this Guide | 1
Overview | 1
Connect an ACX7024 Router to Furuno TB-1 GNSS Receiver and Install GNSS Antenna | 3
Clock Cable and Antenna Cable Specicaons | 5
ACX7024 Device GNSS Conguraon | 11
Conguraon Statements | 14
Administrave Commands | 17
Monitoring Commands | 22
About this Guide
Use this guide to learn more about the Global Navigaon Satellite System (GNSS) capabilies on a Juniper Networks®
ACX7024 Cloud Metro router. In this guide, you will learn how to connect an ACX7024 router to a FURUNO TB-1
GNSS receiver.
As a network or system administrator you can use this guide to install the FURUNO TB-1 GNSS receiver on an
ACX7024 router.
Overview
Global Navigaon Satellite System (GNSS) capability is essenal for the Grand Master (GM) clock funconality. A GNSS
receiver receives signals from a navigaon satellite constellaon. The GNSS receiver gains precise phase and me
informaon by processing these signals and delivers the informaon across the network.
Starng in Junos OS Evolved Release 23.1R1, the ACX7024 supports telecom grandmaster (T-GM) funconality using
an external GNSS receiver as a source for me informaon. The GNSS receiver obtains and processes the signals from a
navigaon satellite constellaon to deliver precise phase and me informaon across the enre packet network. The T-
GM funconality can be used, for example, to provide required synchronizaon to base staons in a data network. With
this feature, the ACX7024 devices can funcon as an edge T-GM by connecng to an external Furuno TB-1 GNSS
receiver.
The Furuno TB-1 GNSS receiver supports the following ming standards:
• IEEE standard 1588-2008, IEEE Standard for a Precision Clock Synchronizaon for Networked Measurement and
Control Systems, July 2008.
• ITU-T G.8262, G.8263, G.8265, G.8272 PRTC Class A and G.8275.
The Furuno TB-1 GNSS receiver and the Telecom Grand Master (T-GM) funconality on the ACX7024 device provides
several benets including the following:
•Mul-constellaon receiver that supports:
• GPS L1C/A
• GLONASS L1OF
• GALILEO E1B/E1C
• QZSS L1C/A
• Time traceability to GPS or UTC
• Coherent 10-MHz and 1- pulse per second (PPS) outputs
• OCXO-based receiver
•An-jamming and an-spoong support that includes mulpath spoong, jamming, interference detecon and
isolaon mechanisms.
• Supported on 10G and 25G ports.
• Transmission of Ethernet Synchronizaon Message Channel (ESMC) and enhanced ESMC packets for synchronous
Ethernet as per G.8264 standards.
For more informaon about the Furuno TB-1 GNSS receiver, see the TB-1 Operaon Manual.
2
Connect an ACX7024 Router to Furuno TB-1 GNSS
Receiver and Install GNSS Antenna
IN THIS SECTION
Connect an ACX7024 Router to Furuno TB-1 GNSS Receiver | 3
Install the GNSS Antenna | 4
Gain and Noise Figure (NF) Calculaon | 4
Before you connect an ACX7024 router to the TB-1 GNSS receiver:
• Read "Install the GNSS Antenna" on page 4.
• Ensure that the following cables are available:
• Clock cables. See "Clock Cable Specicaons" on page 5.
• Antenna cables. See "Antenna Cable Specicaons" on page 7.
• Follow the instrucons in "Cabling Guidelines" on page 10.
Connect an ACX7024 Router to Furuno TB-1 GNSS
Receiver
To connect an ACX7024 router to a Furuno TB-1 GNSS receiver:
1. Connect one end of an RG-58 cable to the PPS connector port on the TB-1 GNSS receiver (labeled PPS) and the
other end of the cable to the 1PPS connector port on the ACX7024 router (labeled 1PPS IN).
2. Connect one end of an RG-58 cable to the 10-MHz connector port on the TB-1 GNSS receiver (labeled 10MHz) and
the other end of the cable to the 10-MHz connector port on the ACX7024 router (labeled 10MHz IN).
3. Use a USB-C to USB-C cable to connect one end of the cable to the data port (labeled DATA) on the TB-1 GNSS
receiver and the other end to the USB type C port on the ACX7024 router.
3
4. Connect one end of the LMR400 cable to the GNSS connector port (labeled GNSS) on the TB-1 GNSS receiver and
the other end to the GNSS antenna.
Install the GNSS Antenna
You must install a Global Navigaon Satellite System (GNSS) antenna to ensure opmal signal recepon. For informaon
about antenna installaon guidelines, see
GNSS Antenna Installaon
in the TB-1 Operaon Manual.
To enable the Furuno TB-1 GNSS receiver, connect to the Furuno AU-217 antenna. For informaon about installing the
AU-217 antenna, see GNSS Antenna AU-217 Installaon Procedure.
Gain and Noise Figure (NF) Calculaon
To calculate the total gain and NF, see GNSS Antenna Installaon Appendix on the Furuno data download page.
RELATED DOCUMENTATION
No Link Title
4
Clock Cable and Antenna Cable Specicaons
IN THIS SECTION
Clock Cable Specicaons | 5
Antenna Cable Specicaons | 7
Cabling Guidelines | 10
Clock Cable Specicaons
IN THIS SECTION
TE Cable Specicaons | 6
Samtec Cable Specicaons | 7
The ACX7024 router supports an RG-58 clock cable that has an SMA male connector at one end and a DIN 1.0/2.3
connector at the other end.
We recommend the following Juniper-qualied clock cables:
• RG-58 cable from TE Connecvity (Part number: 2423629-4). For more informaon, see "TE Cable Specicaons"
on page 6.
• RG-58 cable from Samtec (Part number: RSP-228559-01). For more informaon, see "Samtec Cable Specicaons"
on page 7.
5
TE Cable Specicaons
Electrical Characteriscs
Impedance 50 Ω
Frequency DC-3GHz
Voltage Rang 170 Vrms
Dielectric Withstanding Voltage 750 V min
Insulaon Resistance 500 MΩ
Inseron Loss 4 dB max
V.S.W.R 1.2 max
6
Samtec Cable Specicaons
Electrical Characteriscs
Impedance 50 Ω
Frequency 3GHz
Dielectric Withstanding Voltage 750 V
V.S.W.R 1.3 max
Antenna Cable Specicaons
IN THIS SECTION
LMR400 (10-m Segment) Cable Specicaons | 8
LMR400 (95-m Segment) Cable Specicaons | 9
LMR400 (5-m Segment) Cable Specicaons | 10
The following topology (Figure 1 on page 8) depicts the antenna cable connecons with connector types. Use this
topology as an example to install the antenna cables.
7
Figure 1: LMR400 Cable Connecons
Juniper has tested this topology with the following LMR400 cables:
• LMR400 (10-m segment) from TE Connecvity (Part number: CD-2430293). For more informaon, see "LMR400
(10-m Segment) Cable Specicaons" on page 8.
• LMR400 (95-m segment) from TE Connecvity (Part number: CD-2430295). For more informaon, see "LMR400
(95-m Segment) Cable Specicaons" on page 9.
• LMR400 (5-m segment) from TE Connecvity (Part number: CD-2430297). For more informaon, see "LMR400 (5-
m Segment) Cable Specicaons" on page 10.
You must ensure that you install a surge protector to protect the GNSS receiver from lightning surges. This topology
uses TVA-03C and TVA-03V surge protectors. For more informaon about the surge protectors, see Coaxial lightning
arrestor TVA-03.
The following secons describe the antenna cable specicaons:
LMR400 (10-m Segment) Cable Specicaons
8
Electrical Characteriscs
Impedance 50 Ω
Frequency DC-3GHz
Voltage Rang 335 Vrms
Dielectric Withstanding Voltage > 1000 V
Insulaon Resistance > 5000 MΩ
LMR400 (95-m Segment) Cable Specicaons
Electrical Characteriscs
Impedance 50 Ω
Frequency DC-3GHz
Voltage Rang 335 Vrms
Dielectric Withstanding Voltage > 1000 V
Insulaon Resistance > 5000 MΩ
9
LMR400 (5-m Segment) Cable Specicaons
Electrical Characteriscs
Impedance 50 Ω
Frequency DC-3GHz
Voltage Rang 335 Vrms
Dielectric Withstanding Voltage > 1000 V
Insulaon Resistance > 5000 MΩ
Cabling Guidelines
Follow these guidelines when you install cables:
• Ensure that the GNSS dongle can track the satellites and can acquire a lock.
• Examine the cable end points and connectors for any bends or damage.
• Check the electrical connuity of the cable for both inner and outer conductors.
• Check for any electrical short in cables.
• Inspect the cable outer sheath for any damage.
10
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