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Juniper ACX7024 Manual

Grand master clock support using external gnss receiver
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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 Specifications | 5
ACX7024 Device GNSS Configuration | 11
Configuration Statements | 14
Administrative Commands | 17
Monitoring Commands | 22
About this Guide
Use this guide to learn more about the Global Navigation Satellite System (GNSS) capabilities 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 Navigation Satellite System (GNSS) capability is essential for the Grand Master (GM) clock functionality. A GNSS
receiver receives signals from a navigation satellite constellation. The GNSS receiver gains precise phase and time
information by processing these signals and delivers the information across the network.

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Summary of Contents for Juniper ACX7024

  • Page 1 Use this guide to learn more about the Global Navigation Satellite System (GNSS) capabilities 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.
  • Page 2 The T- GM functionality can be used, for example, to provide required synchronization to base stations in a data network. With this feature, the ACX7024 devices can function as an edge T-GM by connecting to an external Furuno TB-1 GNSS receiver.
  • Page 3 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...
  • Page 4 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 Navigation Satellite System (GNSS) antenna to ensure optimal signal reception. For information GNSS Antenna Installation in the about antenna installation guidelines, see TB-1 Operation...
  • Page 5 TE Cable Specifications | 6 Samtec Cable Specifications | 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-qualified clock cables: •...
  • Page 6 TE Cable Specifications Electrical Characteristics Impedance 50 Ω Frequency DC-3GHz Voltage Rating 170 Vrms Dielectric Withstanding Voltage 750 V min Insulation Resistance 500 MΩ Insertion Loss 4 dB max V.S.W.R 1.2 max...
  • Page 7 Samtec Cable Specifications Electrical Characteristics Impedance 50 Ω Frequency 3GHz Dielectric Withstanding Voltage 750 V V.S.W.R 1.3 max Antenna Cable Specifications IN THIS SECTION LMR400 (10-m Segment) Cable Specifications | 8 LMR400 (95-m Segment) Cable Specifications | 9 LMR400 (5-m Segment) Cable Specifications | 10 The following topology (Figure 1 on page 8) depicts the antenna cable connections with connector types.
  • Page 8 Figure 1: LMR400 Cable Connections Juniper has tested this topology with the following LMR400 cables: • LMR400 (10-m segment) from TE Connectivity (Part number: CD-2430293). For more information, see "LMR400 (10-m Segment) Cable Specifications" on page • LMR400 (95-m segment) from TE Connectivity (Part number: CD-2430295). For more information, see "LMR400...
  • Page 9 Electrical Characteristics Impedance 50 Ω Frequency DC-3GHz Voltage Rating 335 Vrms Dielectric Withstanding Voltage > 1000 V Insulation Resistance > 5000 MΩ LMR400 (95-m Segment) Cable Specifications Electrical Characteristics Impedance 50 Ω Frequency DC-3GHz Voltage Rating 335 Vrms Dielectric Withstanding Voltage >...
  • Page 10 LMR400 (5-m Segment) Cable Specifications Electrical Characteristics Impedance 50 Ω Frequency DC-3GHz Voltage Rating 335 Vrms Dielectric Withstanding Voltage > 1000 V Insulation 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. •...
  • Page 11 SUMMARY Configure GNSS Receiver | 12 The ACX7024 device supports the G.8275.1 profile, Telecom Grand Master (T-GM) time management functionality for all devices on the network on 10G and 25G ports. Additionally, the system supports the following functionalities: – Compliance to ITU-T G.8272 (Unified functional architecture for transport networks) PRTC Class A.
  • Page 12 To optimize the GNSS capability, establish a common time scale and coordinated system between all the systems. This coordinated system simplifies network synchronization, provides flexibility and resiliency. Table 1 describes the steps to configure GNSS receiver on ACX7024 router. Table 1: GNSS Receiver Configuration...
  • Page 13 (Continued) Table 1: GNSS Receiver Configuration Configuration Step Command Step 2: (Optional) Specify the position mode. TB-1 as timing [edit chassis synchronization gnss-receiver number ] receiver has two different position modes— position-fix-mode user@host# set position-mode and survey-mode. The default position mode is survey-mode if no specific mode is configured.
  • Page 14 Table 1: GNSS Receiver Configuration (Continued) Configuration Step Command Step 6: Verify the configuration. [edit] For more information about the operational commands, see show user@host# run show chassis synchronization gnss-receiver chassis synchronization gnss-receiver extensive, show chassis extensive synchronization extensive, and show ptp lock-status detail.
  • Page 15 Syntax clock-mode (ordinary); Hierarchy Level [edit protocols ptp] Description Configure the clock mode as ordinary clock with GNSS configuration. The clock mode determines whether the node behaves as a client or primary node. This attribute is mandatory and has no default value. Options ordinary—The clock mode of the node is a system clock that acts either as a primary node or as a client node.
  • Page 16 [edit protocols ptp] Description On ACX7024 router, configure the G.8275.1 profile for GNSS configuration that require accurate phase and time synchronization. This profile supports the architecture defined in ITU-T G.8271.1 specification to enable the distribution of phase and time with full timing support. This profile requires all devices in the network to operate in combined or hybrid modes.

  • Page 17: Table Of Contents

    IN THIS SECTION SUMMARY ptp-mode | 17 gnss-receiver | 18 transport-ieee-802.3 | 21 ptp-mode IN THIS SECTION Syntax (ACX7024) | 17 Hierarchy Level | 17 Description | 18 Required Privilege Level | 18 Syntax (ACX7024) ptp-mode; Hierarchy Level name pic name ]...

  • Page 18: In This Section

    Description The PTP mode configuration is mandatory to enable the PTP ordinary clock feature in ACX7024. When you enable PTP mode, the system disables one of the ports that are used for data traffic. For example, on ACX7024, when you enable PTP mode, port 27 is disabled.

  • Page 19: Description

    [edit chassis synchronization] Description Configure GNSS receiver with ACX7024 router. The GNSS receiver receives signals from a navigation satellite constellation. The receiver gains precise phase and time information by processing these signals and delivers the information across the packet network.

  • Page 20: Required Privilege Level

    • qzss: Enables detection and locking to the QZSS constellation. interface—Enable/Disable GNSS port/slot communication. NOTE: For ACX7024 router, only one port of GNSS receiver is supported. position-mode—GNSS receiver's position modes. You can configure two position modes of GNSS receiver— position-fix- mode and survey-mode.

  • Page 21: Transport-Ieee-802.3

    transport-ieee-802.3 IN THIS SECTION Syntax | 21 Hierarchy Level | 21 Description | 21 Options | 21 Required Privilege Level | 22 Syntax transport ieee-802.3; Hierarchy Level <interface-name> multicast-mode] [edit protocols ptp master interface Description Configure Ethernet as the encapsulation type for transport of Precision Time Protocol (PTP) packets. Ethernet encapsulation type is supported for transmission of PTP packets in multicast mode.
  • Page 22 link-local—Enable primary or client to choose either of the two MAC addresses defined in the IEEE 1588-2008 standard. When you configure this option, the system attempts to use the MAC address (link-local multicast address) for multicast transmission. If the link-local multicast address is not available, the system uses the standard Ethernet multicast address as a second priority.

  • Page 23: Show Chassis Synchronization Extensive

    Sample Output | 24 Syntax show chassis synchronization extensive interface-name > <interface <no-forwarding> Description Display detailed clock synchronization information. Options interface interface-name (Optional) Display clock synchronization information for the specified interface. no-forwarding (Optional) Display clock synchronization information for interfaces configured with no- forwarding option.

  • Page 24: Show Chassis Synchronization Extensive

    The source to which the clock is locked. The clock can be locked to either the source or the secondary source. SNMP trap status Indicates the SNMP trap generation status (Enabled or Disabled) on ACX7024 router. Sample Output show chassis synchronization extensive user@host> show chassis synchronization extensive Current clock status : LOCKED...

  • Page 25: Show Ptp Lock-Status Detail

    Sample Output | 26 Syntax show ptp lock-status detail Description Display information about the lock status of the client. The output verifies whether the ACX7024 is locked to GNSS receiver or not. Options This command has no options. Required Privilege Level...
  • Page 26 Output Fields Table 1 lists the output fields for the show ptp lock-status detail command. Output fields are listed in the approximate order in which they appear. Table 3: show ptp lock-status detail Output Fields Field Name Field Description Lock State State of the client clock with respect to its primary clock: •...

  • Page 27: Show Chassis Synchronization Gnss-Receiver Extensive

    show chassis synchronization gnss-receiver extensive IN THIS SECTION Syntax | 27 Description | 27 Options | 27 Output Fields | 27 Sample Output | 30 Syntax show chassis synchronization gnss-receiver extensive <time> Description Display information about the status of the GNSS receiver. Options time (Optional) Display GNSS receiver time information in detail.
  • Page 28 NOTE: Only TB-1 is supported. Port Status Indicates the status of the configured port. • Up — TB-1 is connected to ACX7024 and can communicate over channel. • Down — TB-1 is not connected. Port Details GNSS receiver port details, type of interface, and speed.
  • Page 29 A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the solar time. 1PPS STATUS Indicates PPS signal received on the GPS interface of ACX7024. • Available — 1PPS from TB-1 is received on the GPS interface.
  • Page 30 (Continued) Table 4: show chassis synchronization gnss-receiver extensive Output Fields Field Name Field Description Constellation Satellite constellation that GNSS detects and locks to. Position mode Position modes of the GNSS receiver. Self Survey Length Duration for which the GNSS receiver can survey its own position before moving to position-fix- mode.
  • Page 31 Acquired Galileo Juniper Networks, the Juniper Networks logo, Juniper, and Junos are registered trademarks of Juniper Networks, Inc. in the United States and other countries. All other trademarks, service marks, registered marks, or registered service marks are the property of their respective owners. Juniper Networks assumes no responsibility for any inaccuracies in this document.

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