Juniper ACX7024X Manual
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Juniper ACX7024X Manual

Grand master clock support using external gnss receiver
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Grand Master Clock Support Using External GNSS
Receiver for ACX7024 and ACX7024X
IN THIS GUIDE
About this Guide | 1
Overview | 1
Install and Connect the FURUNO TB-1 GNSS Receiver | 3
Antenna Cable Specifications | 8
GNSS Configuration for ACX7024 and ACX7024X Routers | 12
Configuration Statements | 17
Administrative Commands | 20
Monitoring Commands | 25
About this Guide
Use this guide to learn more about the Global Navigation Satellite System (GNSS) capabilities on a Juniper Networks®
ACX7024 and ACX7024X Cloud Metro router. In this guide, you will learn how to connect an ACX7024 and ACX7024X
router to a FURUNO TB-1 GNSS receiver.
As a network or system administrator you can use this guide to install the TB-1 receiver on a 19-inch (19-in.) rack and
connect the receiver to an ACX7024 or ACX7024X 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 ACX7024X

  • Page 1 Use this guide to learn more about the Global Navigation Satellite System (GNSS) capabilities on a Juniper Networks® ACX7024 and ACX7024X Cloud Metro router. In this guide, you will learn how to connect an ACX7024 and ACX7024X router to a FURUNO TB-1 GNSS receiver.
  • Page 2 With this feature, the ACX7024 and ACX7024X routers can function as an edge T-GM by connecting to an external FURUNO TB-1 GNSS receiver (TB-1 receiver).
  • Page 3 • Understand the required environmental conditions for normal router operation. For more information, see ACX7024 Router Environmental Tolerances ACX7024X Router Environmental Tolerances. • Ensure that the ACX7024 or ACX7024X router is grounded. For more information, see Connect Earth Ground to ACX7024 or ACX7024X Routers. • Read "Install the GNSS Antenna"...
  • Page 4 Table 1: GNSS Accessory Kit Component Quantity TB-1 receiver GNSS receiver mounting screws USB-C to USB-C cable Clock cables (RG58) Rack mount tray Install the TB-1 Receiver in a Rack To install the TB-1 receiver on a 19 in. rack, you must first secure the receiver to the mounting tray and then attach the mounting tray to the rack.
  • Page 5 Figure 1: Installation Patterns NOTE: You can install up to two TB-1 receivers on a mounting tray. To install the TB-1 receiver in a rack, follow the steps given below: 1. Secure the TB-1 receiver to the mounting tray using the four mounting screws (provided). a.
  • Page 6 Figure 4: TB-1 Receiver Installed on a Rack 6. After you have installed the TB-1 receiver, connect the ACX7024 or ACX7024X router to the TB-1 receiver. For more information, see "Connect an ACX7024 or ACX7024X Router to the TB-1 Receiver" on page...
  • Page 7 2. Connect one end of an RG-58 cable to the 10-MHz connector port on the TB-1 receiver (labeled 10MHz) and the other end of the cable to the 10-MHz connector port on the ACX7024 or ACX7024X router (labeled 10MHz IN).
  • Page 8 4. Connect one end of the LMR400 cable to the GNSS connector port (labeled GNSS) on the TB-1 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 about antenna installation guidelines, see GNSS Antenna Installation in the TB-1 Operation...
  • Page 9 9) depicts the antenna cable connections with connector types. Use this topology as an example to install the antenna cables. Figure 5: Cable Connections Juniper has tested this topology with the following cables: • LMR400 (10-m segment) from TE Connectivity (Part number: CD-2430293). For more information, see "LMR400 (10-m Segment) Cable Specifications"...
  • Page 10 You must ensure that you install a surge protector to protect the GNSS receiver from lightning surges. The surge protector next to the outdoor antenna must be a safety-certified antenna surge protector (certified to UL 497B or its IEC equivalent). The topology shown in Figure 5 on page 9 uses a Polyphaser surge protector.
  • Page 11 LMR400 (95-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 RG-58 (1-m Segment) Cable Specifications...
  • Page 12 • Check the electrical continuity of the cable for both inner and outer conductors. • Check for any electrical short in cables. • Inspect the cable outer sheath for any damage. GNSS Configuration for ACX7024 and ACX7024X Routers IN THIS SECTION SUMMARY...
  • Page 13 The ACX7024 and ACX7024X routers support the G.8275.1 profile—Telecom Grand TimeTransmitter (T-GM) functionality using an external TB-1 GNSS receiver. Several benefits of the TB-1 receiver with the T-GM functionality include: – Compliance to ITU-T G.8272 (Unified functional architecture for transport networks) PRTC Class A.
  • Page 14 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 and ACX7024X routers. Table 2: GNSS Receiver Configuration...
  • Page 15 (Continued) Table 2: 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 16 Table 2: GNSS Receiver Configuration (Continued) Configuration Step Command Step 6: Verify the configuration. [edit] For more information about the operational commands, see user@host# run show chassis synchronization gnss-receiver "show chassis synchronization gnss-receiver extensive" on page extensive "show chassis synchronization extensive" on page 25, and "show ptp lock-status detail"...
  • Page 17 IN THIS SECTION SUMMARY clock-mode | 17 This topic describes the various configuration statements required to enable the T-GM functionality on ACX7024 and profile-type | 18 ACX7024X routers. clock-mode IN THIS SECTION Syntax | 17 Hierarchy Level | 18 Description | 18...
  • Page 18 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 timeReceiver or timeTransmitter 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 timeTransmitter node or as a timeReceiver node.
  • Page 19 [edit protocols ptp] Description On ACX7024 and ACX7024X routers, configure the G.8275.1 profile for GNSS receiver that requires 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 20 Administrative Commands IN THIS SECTION SUMMARY ptp-mode | 20 This topic describes the administrative commands required to enable the T-GM functionality on ACX7024 and ACX7024X gnss-receiver | 21 routers. transport-ieee-802.3 | 24 ptp-mode IN THIS SECTION Syntax (ACX7024 and ACX7024X Routers) | 20...
  • Page 21 The PTP mode configuration is mandatory to enable the PTP ordinary clock feature in ACX7024 and ACX7024X routers. When you enable PTP mode on ACX7024 and ACX7024X routers, port 27 is no longer available for use. For more information about valid port configurations on ACX7024 and ACX7024X routers, see Port Speed Overview.
  • Page 22 [edit chassis synchronization] Description Configure GNSS receiver with ACX7024 and ACX7024X routers. 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 23 • qzss: Enables detection and locking to the QZSS constellation. interface—Enable/Disable GNSS port/slot communication. NOTE: For ACX7024 and ACX7024X routers, 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 24 transport-ieee-802.3 IN THIS SECTION Syntax | 24 Hierarchy Level | 24 Description | 24 Options | 24 Required Privilege Level | 25 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 25: Table Of Contents

    | 25 This topic describes the monitoring commands to view and troubleshoot the T-GM configuration on ACX7024 and show ptp lock-status detail | 28 ACX7024X routers. show chassis synchronization gnss-receiver extensive | 30 show chassis synchronization extensive...

  • Page 26: Show Chassis Synchronization Extensive

    Sample Output | 27 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 27: Show Chassis Synchronization Extensive

    Table 3: show chassis synchronization extensive Output Fields Field Name Field Description Current clock status Indicates the current status of chassis synchronization: • Locked —Clock is operational. • Holdover —Clock is not operational. • Freerun —Clock is locked to the free-run local oscillator. •...

  • Page 28: Show Ptp Lock-Status Detail

    Sample Output | 29 Syntax show ptp lock-status detail Description Display information about the lock status of the timeReceiver. The output verifies whether the ACX7024 or ACX7024X router is locked to GNSS receiver. Options This command has no options. Required Privilege Level...
  • Page 29 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 4: show ptp lock-status detail Output Fields Field Name Field Description Lock State State of the timeReceiver clock with respect to its timeTransmitter clock: •...

  • Page 30: Show Chassis Synchronization Gnss-Receiver Extensive

    show chassis synchronization gnss-receiver extensive IN THIS SECTION Syntax | 30 Description | 30 Options | 30 Output Fields | 30 Sample Output | 33 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 31 NOTE: Only TB-1 is supported. Port Status Indicates the status of the configured port. • Up — TB-1 is connected to ACX7024 or ACX7024X router (as applicable) and can communicate over channel. • Down — TB-1 is not connected. Port Details GNSS receiver port details, type of interface, and speed.
  • Page 32 (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 or ACX7024X router (as applicable). • Available — 1PPS from TB-1 is received on the GPS interface.
  • Page 33 (Continued) Table 5: 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 34 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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Acx7024

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