Synchronize Internal Stratum 3 Clock to External Clock Sources on PTX Series Routers

date_range 20-Dec-24

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The PTX Series Packet Transport Routers support an external synchronization interface that can be configured to synchronize the internal Stratum 3 clock to an external source, and then synchronize the chassis interface clock to that source. You can also configure a primary and a secondary clock source.

The following tasks explain how to configure a recovered clock for an FPC and to configure the clock synchronization options:

Configure a Recovered Clock for an FPC

To configure a recovered clock for an FPC on PTX Series routers:

Go to the [edit chassis fpc slot-number pic pic-number] hierarchy level.
```
[edit]
user@host# edit chassis fpc slot-number pic pic-number
```
Configure a port from 0 through 47 through which the clock is recovered.
```
[edit]
user@host# set recovered-clock port port-number
```

Configure External Clock Synchronization Options

You must configure a recovered clock (recovered-clock port port-number) for an interface before configuring clock synchronization options for the same interface.

Use the synchronization statement options to specify a primary and a secondary timing source. To do this, you must configure the following options:

Specify the switching mode as revertive when a lower-priority synchronization source is to be switched to a valid, higher-priority synchronization source.
Specify the primary external timing source with the primary (fpc-slot-number | gps-0 | gps-1 | bits-a | bits-b) statement.
Specify the secondary external timing source with the secondary (fpc-slot-number | gps-0 | gps-1 |bits-a | bits-b) statement.

To configure the clock synchronization options:

In configuration mode, go to the [edit chassis synchronization] hierarchy level.
```
[edit]
user@host# edit chassis synchronization
```
Configure the Synchronous Ethernet clock selection mode as auto-select to select the best external clock source or free-run to use the free-running local oscillator as a clock source.
```
[edit chassis synchronization]
user@host# set clock-mode (auto-select | free-run)
```
Configure the ESMC transmit parameters on all the interfaces or on selected interfaces.
```
[edit chassis synchronization]
user@host# set esmc-transmit interfaces (all | interface-name)
```
Configure the hold interval as configuration-change, which is the wait time (from 15 seconds through 60 seconds) after a change in configuration; restart, which is the wait time (from 60 seconds through 180 seconds) after reboot of the router; and switchover, which is the switchover wait time (from 30 seconds through 60 seconds) after clock recovery.
```
[edit chassis synchronization]
user@host# set hold-interval configuration-change secs
user@host# set hold-interval restart secs
user@host# set hold-interval switchover secs
```
Configure the interface with an available upstream clock source where the clock source is bits-a, bits-b, gps-0, or gps-1. Configure the pulse-per-second-enable statement to enable the pulse per second (PPS) signal to be received on the GPS interface and configure the frequency for the provided reference clock as 5 MHz, 10 MHz, e1, or t1.
```
[edit chassis synchronization]
user@host# set interfaces (bits-a | bits-b | gps-0 | gps-1) (pulse-per-second-enable | signal-type (5mhz | 10mhz |e1 | t1))
```
Configure the maximum transmit quality level as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc.
```
[edit chassis synchronization]
user@host# set max-transmit-quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc)
```
Configure the EEC synchronization networking type as option-1 to map to G.813 option 1 (EEC1)or option-2 to map to G.812 type IV clock (EEC1).
```
[edit chassis synchronization]
user@host# set network-option (option-1 | option-2)
```
Configure the primary synchronization reference source as bits-a, bits-b, gps-0, gps-1, fpc-0, fpc-1, fpc-2, fpc-3, fpc-4, fpc-5, fpc-6, or fpc-7. The selected source is considered to be the best choice among the available sources.
```
[edit chassis synchronization]
user@host# set primary (fpc-slot-number | gps-0 | gps-1 | bits-a | bits-b)
```
Configure the quality-mode-enable statement to enable Synchronous Ethernet ESMC quality mode.
```
[edit chassis synchronization]
user@host# set quality-mode-enable
```
Configure the secondary synchronization reference source as bits-a, bits-b, gps-0, gps-1, fpc-0, fpc-1, fpc-2, fpc-3, fpc-4, fpc-5, fpc-6, or fpc-7. The selected source is considered to be the best alternative among the available sources.
```
[edit chassis synchronization]
user@host# set secondary (fpc-slot-number | gps-0 | gps-1 | bits-a | bits-b)
```
Configure the quality selection mode for the incoming ESMC packets as configured-quality or received-quality.
```
[edit chassis synchronization]
user@host# set selection-mode (configured-quality | received-quality)
```
Configure the ESMC source as bits-a, bits-b, gps-0, or gps-1. For the configured source, configure the priority statement from 1 through 5; the quality-level statement as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the request statement as force-switch or lockout.
```
[edit chassis synchronization]
user@host# source (bits-a | bits-b | gps-0 | gps-1) (priority number | quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc) | request (force-switch | lockout)
```

Configure the switchover mode as revertive or non-revertive.

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[edit chassis synchronization]
user@host# set switchover-mode (non-revertive | revertive)

Note:

To configure the Synchronous Ethernet clock sources, you must configure network-option option, quality-mode-enable, and source interfaces interface-name priority value quality-level level along with other parameters as needed at the [edit chassis synchronization] hierarchy level.

To configure ESMC transmit interface, you must configure esmc-transmit interface interface-name along with other parameters as needed at the [edit chassis synchronization] hierarchy level.

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Timing and Synchronization Guide

ON THIS PAGE

Synchronize Internal Stratum 3 Clock to External Clock Sources on PTX Series Routers

Configure a Recovered Clock for an FPC

Configure External Clock Synchronization Options

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