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  - Integrated Global Navigation Satellite System (GNSS) on Routing Platforms
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  - Example: Configure Framing Mode for Synchronous Ethernet with 10-Gigabit Ethernet MIC
play_arrow Clock Synchronization
- play_arrow Clock Synchronization Concepts
- play_arrow Clock Synchronization for ACX Series Routers
  - Configure External Clock Synchronization for ACX Series Routers
- play_arrow Clock Synchronization for MX Series Routers
  - Configure External Clock Synchronization for MX Series Routers
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  - Clock Sources for PTX Series Routers
  - Synchronize Internal Stratum 3 Clock to External Clock Sources on PTX Series Routers
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- play_arrow Hybrid Mode Overview
  - Hybrid Mode
  - Guidelines to Configure Hybrid Mode on ACX Series Routers
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play_arrow Configuration Statements and Operational Commands
- Junos CLI Reference Overview
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English

Monitoring Commands to Enable T-GM Functionality

date_range 20-Dec-24

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This topic describes the monitoring commands to view and troubleshoot the T-GM configuration on the supported routers.

Syntax

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show chassis synchronization extensive
<interface interface-name>
<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.

Required Privilege Level

maintenance

Output Fields

Table 1 lists the output fields for the show chassis synchronization extensive command. Output fields are listed in the approximate order in which they appear.

Table 1: 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. `Acquiring`—Clock is attempting to acquire a lock on the specified clock source.
`Clock locked to`	The source to which the clock is locked. The clock can be locked to either the `primary` source or the `secondary` source.
`SNMP trap status`	Indicates whether the SNMP trap generation status is `Enabled` or `Disabled` on the router.

Sample Output

show chassis synchronization extensive

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user@host> show chassis synchronization extensive
Current clock status  : LOCKED
Clock locked to       : Primary
SNMP trap status      : Disabled
 
Configured ports:
 
Name                : gnss-rx-0
Current ToD         : Sat Nov 12 14:14:19 2022 PST
Last ToD update     : Sat Nov 12 14:14:18 2022 PST
GPS receiver status : Synchronized
UTC Pending         : FALSE
UTC Offset          : 37
 
One PPS status : Active

show ptp lock-status detail

Syntax
Description
Options
Required Privilege Level
Output Fields
Sample Output

Syntax

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show ptp lock-status detail

Description

Display information about the lock status of the timeReceiver. The output verifies whether the router is locked to GNSS receiver.

Options

This command has no options.

Required Privilege Level

view

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 2: show ptp lock-status detail Output Fields
Field Name	Field Description
`Lock State`	State of the timeReceiver clock with respect to its timeTransmitter clock: `Freerun` `Holdover` `Phase Aligned` `Acquiring` `Initializing`
`State since`	Date, time, and how long ago the lock status of the PTP timeReceiver or timeReceiver clock changed. The format is `State since: year-month-day hour:minute:second:timezone (hour:minute:second ago)`. For example, `2022-11-10 04:18:40 PST (00:47:10 ago)`.
`Source`	Information about external clock sources.

Sample Output

show ptp lock-status detail

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user@host> show ptp lock-status detail
Lock Status:

Lock State    : 5 (PHASE ALIGNED)
State since   : 2022-11-10 04:18:40 PST (00:47:10 ago)

Source: GNSS

show chassis synchronization gnss-receiver extensive

Syntax
Description
Options
Output Fields
Sample Output

Syntax

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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.

Output Fields

Table 1 lists the output fields for the show chassis synchronization gnss-receiver extensive command. Output fields are listed in the approximate order in which they appear.

Table 3: show chassis synchronization gnss-receiver extensive Output Fields
Field Name	Field Description
`Lock status`	Indicates the lock status of the GNSS receiver: `Warmup`—In this state the GNSS receiver waits for internal clock synchronization after you turn on the power supply. `Pull-in`—In this state the receiver receives the signal from a satellite constellation. `Coarse-lock`—In this state the receiver is locked to a satellite constellation but requires further synchronization. `Fine-lock`—In this state the receiver is locked accurately to the satellite constellation and starts synchronizing. `Holdover`—In this state the GNSS RF signals are lost or not strong enough to enable locking. `Out of Holdover`—In this state 10-MHz frequency and 1-PPS signal are beyond holdover specification.
`Receiver-type`	Indicates the type of the receiver. Note: Only TB-1 is supported.
`Port Status`	Indicates the status of the configured port. `Up`— TB-1 is connected tothe supported 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.
`Current TOD`	The current time of the day indicated by the receiver.
`UTC Pending`	The status of UTC leap collection by the receiver. `True`— UTC parameters are not available. `False`— UTC parameters are available.
`UTC offset (TAI-UTC)`	UTC offset between International Atomic Time (TAI) scale and Coordinated Universal Time (UTC) scale.
`Future leap sec & schedule`	Indicates the schedule and leap second correction values. 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 the supported router (as applicable). `Available`— 1PPS from TB-1 is received on the GPS interface. `Not available`—1PPS from TB-1 is not received on the GPS interface.
`10mhz status`	Indicates frequency output status of 10-MHz availability from receiver. `Available`—10-MHz frequency from TB-1 is received on the GPS interface. `Not available`—10-MHz frequency from TB-1 is not received on the GPS interface.
`Time source`	The standard time source to which the receiver current time is aligned.
`Alarms`	Alarm signals or messages. Possible messages are: `Spoofing detected` `Jamming detected` `Antenna short circuit` `Receiver oscillator error` `Receiver data errors` `No PPS` `No 10MHz`
`Antenna port status`	Status of the configured antenna. `Open`— No antenna is connected. `Good`— Antenna is connected and detected. `Bad`— Antenna is connected but failed to detect due to less antenna power circuitry within receiver.
`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. The Self-survey length is specified in minutes.
`Cable Delay Compensation`	Indicates the time duration to compensate the delay introduced due to RF cable which is routed from the antenna to TB1 RF input. Cable delay compensation is specified in nanoseconds.
`Latitude`	GNSS receiver's latitude in degree minutes.
`Longitude`	GNSS receiver's longitude in degree minutes.
`Altitude`	GNSS receiver's altitude in meters.
`No. of Satellites Used`	Number of satellites are used for position and time solutions.
`Visible Satellite List`	The current tracking satellite number, its signal strength in dBHz, and the constellation to which the satellite belongs.

Sample Output

show chassis synchronization gnss-receiver extensive

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user@host> show chassis synchronization gnss-receiver extensive

Lock status                    : warmup / pull-in / coarse-lock / fine-lock / holdover / out of holdover
Receiver-type                  : TB-1
Port Status                    : Up / Down
Port Details                   : UART 9600 bps / USB 
Current ToD                    : 05:02:15 29/11/2019
UTC Pending                    : FALSE
UTC offset (TAI-UTC)           : 37
Future leap sec & schedule     : -99/+99 date and Time
1PPS STATUS                    : Available /Not available
10MHz status                   : Available /Not available
Time source                    : GPS/UTC/USNO/SU/Eu/NCIT
Alarms                         : NONE
Antenna port status:           : Open/Good(connected)/Bad
Constellation                  : GPS L1CA
Position mode                  : Position-fix-mode/survey-mode
Self Survey Length             : 120 mins
Cable Delay Compensation       : 0 ns
Snr-threshold                  : 0 dBHz
Latitude                       : 37 33' 0.036000'' N 
Longitude                      : 126 58' 23.483999'' E 
Altitude                       : 976 m
No. of Satellites Used         : 13
Visible Satellite List:
Sat-Num   Signal-level     Status        Type
222       41    dBHz       Acquired      GPS
216       40    dBHz       Acquired      GPS
213       40    dBHz       Acquired      GPS
209       39    dBHz       Acquired      GPS
202       39    dBHz       Acquired      GPS
221       38    dBHz       Acquired      GLONASS
205       37    dBHz       Acquired      Galileo 

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Timing and Synchronization Guide

ON THIS PAGE

Monitoring Commands to Enable T-GM Functionality

show chassis synchronization extensive

Syntax

Description

Options

Required Privilege Level

Output Fields

Sample Output

show chassis synchronization extensive

show ptp lock-status detail

Syntax

Description

Options

Required Privilege Level

Output Fields

Sample Output

show ptp lock-status detail

show chassis synchronization gnss-receiver extensive

Syntax

Description

Options

Output Fields

Sample Output

show chassis synchronization gnss-receiver extensive

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