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NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management
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Configuring the Time Synchronization Function

Configuring the Time Synchronization Function

This section describes how to configure the time synchronization function.

Usage Scenario

On the IP RAN shown in Figure 14-3, time synchronization needs to be performed between NodeBs. The Atom GPS timing solution can be deployed as follows to allow time synchronization: Insert an Atom GPS module into an ASG so that the Atom GPS module can synchronize clock signals with the GPS and the ASG can synchronize clock signals with the Atom GPS module. Then, configure the time synchronization function to allow transmission of clock signals to other devices on the bearer network. In this manner, network-wide clock synchronization is achieved.

Figure 14-3 Networking of Atom GPS timing

Pre-configuration Tasks

Before configuring the time synchronization function, complete the following tasks:

  • Configure physical parameters of an interface and set the physical status of the interface to Up.

  • Configure the Atom GPS module to properly process GPS time signals.

Configuration Procedure

Figure 14-4 Flowchart for configuring the time synchronization function

NOTE:
After the successful deployment of the time synchronization function on the AE 905S module, you can configure the 1588v2 or G.8275.1 on the device which the AE 905S module inserted in to send the clock signals to other devices.

Configuring the Time Synchronization Function on an Atom GPS Module

This section describes how to configure the time synchronization function on an Atom GPS module so that GPS time signals can be transmitted to the Router where the Atom GPS module houses through 1588v2 packets and then to downstream devices.

Context

NOTE:
The attributes that can be configured on an Atom GPS module are the clock domain and priority1 and priority2 of the time source.
  • The class of a clock source cannot be specified. The initial class 248 is used by default when a clock source goes online. After the clock source successfully traces GPS signals, its class changes to 6 (a device using a class-6 clock source cannot be the secondary devices of other clocks in the clock domain). After the clock source loses track of GPS signals, its class changes to 248 again.
  • The accuracy of a clock source cannot be specified. The initial value 0xFE is used by default when a clock source goes online. After the clock source successfully traces GPS signals, its accuracy changes to 0x21 (specific to 100 ns). After the clock source loses track of GPS signals, its class changes to 0xFE again.
  • The stability of a clock source cannot be configured. The value is 0xFFFF (if T-GM is not connected to ePRTC).

Perform the following operations on the Router where the Atom GPS module houses:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) Run smart-clock ptp domain

    A clock domain is configured for the Atom GPS module.

  4. (Optional) Run smart-clock ptp { priority1 | priority2 } priority-value

    Priority 1 or priority 2 of the time source is configured for the Atom GPS module.

  5. Run commit

    The configuration is committed.

Configuring the 1588v2 Synchronization Function on the Router Where an Atom GPS Module Houses

Configuring 1588v2 globally involves operations such as enabling 1588v2 in the system view and setting the device type to BC. After enabling 1588v2 in the system view, enable it in the interface view. In addition, specify the link delay measurement mechanism, asymmetric correction value, and timestamping mode for the interfaces.

Context

NOTE:
In this process, the host Router and AE 905S module can function only as the 1588v2 BCs.
Perform the following steps on the BC:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ptp enable

    1588v2 is enabled.

  3. Run ptp device-type bc

    The device type is set to BC.

  4. (Optional) Run ptp domain

    A clock domain is configured.

    NOTE:
    Devices in the same clock domain can exchange 1588v2 packets to synchronize time signal.

  5. (Optional) Run ptp virtual-clock-id clock-id-value

    A virtual clock ID is configured for the BC.

  6. (Optional) Run ptp asymmetry-measure enable

    Automatic asymmetry measurement is enabled for the BC on a 1588v2 ring network.

  7. (Optional) Run ptp set-port-state enable

    Manually specifying the 1588v2 interface status is enabled.

  8. Run interface interface-type interface-number

    The interface view is displayed.

  9. Run ptp delay-mechanism delay

    The delay request-response mechanism is configured.

  10. Run ptp enable

    1588v2 is enabled for the interface.

  11. (Optional) Run ptp announce-drop enable

    The interface is configured to discard Announce messages.

    NOTE:
    Devices exchange Announce messages to establish the synchronization hierarchy. If an interface is configured to discard Announce messages, the device cannot receive clock synchronization information from other devices through this interface.

  12. (Optional) Run ptp clock-step one-step

    The timestamping mode for 1588v2 packets is set to one-step.

  13. (Optional) Run ptp passive-measure enable

    Performance measurement is enabled for the interface in the passive state.

  14. (Optional) Run ptp passive-measure alarm-threshold alarm-threshold-value

    An alarm threshold of the offset (time difference between slave and master clocks) is configured for the interface in the passive state.

Configuring the G.8275.1 Synchronization Function on the Router Where an Atom GPS Module Houses

You need to enable G.8275.1 on a router in the system view, configure the router as a T-BC, specify the domain to which the router belongs to, and enable the static configuration of the status of the T-BC interface. After enabling G.8275.1 in the system view, you need to enable G.8275.1 in the interface view.

Context

Perform the following operations on the T-BC:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ptp enable

    PTP is enabled.

  3. Run ptp profile g-8275-1 enable

    G.8275.1 is enabled.

  4. Run ptp device-type t-bc

    The device type is set to T-BC.

  5. (Optional) Run ptp domain domain-value

    The domain where the device resides is configured.

    NOTE:
    Devices in the same clock domain can exchange G.8275.1 packets to synchronize time signals.

  6. (Optional) Run ptp virtual-clock-id clock-id-value

    A virtual clock ID is set.

  7. (Optional) Configure automatic asymmetry measurement for fibers.
    1. Run ptp asymmetry-measure enable

      Automatic asymmetry measurement is enabled on the Router.

    2. Run ptp passive-measure enable

      The performance monitoring function is enabled on the passive interface of a G.8275.1 device.

    3. Run ptp passive-measure alarm-threshold alarm-threshold-value

      An alarm threshold is configured for the time offset (time difference between the master and slave clocks) on the passive interface of a G.8275.1 device.

  8. (Optional) Configure the clock source access control function.
    1. ptp acl enable

      The clock source access control function is enabled.

    2. Run ptp acl-permit-clockid clockid-value

      A clock ID is configured for a T-BC to allow for local BMC algorithm.

  9. (Optional) Run ptp max-steps-removed

    The maximum number of hops for time synchronization is configured. A clock source is considered unavailable if stepsRemoved in the Announce packets received by the clock source is greater than or equal to max-steps-removed-value.

  10. Run commit

    The configuration is committed.

  11. Run interface interface-type interface-number

    The interface view is displayed.

  12. Run ptp enable

    PTP is enabled on the interface.

  13. (Optional) Run ptp notslave disable

    The notslave attribute of the interface is set to FALSE.

  14. (Optional) Run ptp local-priority local-priority-value

    The local priority of a PTP interface is set.

  15. (Optional) Run ptp asymmetry-correction { negative negative-asymmetry-correction-value | positive positive-asymmetry-correction-value }

    The asymmetric correction time for sending G.8275.1 packets on the interface is set.

  16. (Optional) Run ptp clock-step { one-step | two-step }

    The timestamping mode of the synchronization packets sending by the G.8275.1 port is set.

  17. Run commit

    The configuration is committed.

Checking the Configurations

Context

After configuring the SyncE function of the Atom GPS timing system, check the configurations.

Procedure

  • Run the display ptp all [ state | config ] command to check the time synchronization status and configurations of the involved device.
  • Run the display ptp interface interface-type interface-number command to check the time synchronization information about the specified interface.
  • Run the display smart-clock interface interface-type interface-number command to check information about the Atom GPS module on the specified interface.

Example

Run the display ptp all command. The command output shows that BITS information has been imported successfully.
<HUAWEI> display ptp all
Device config info
  ------------------------------------------------------------------------------
  PTP state         :enabled              Domain  value      :0
  Slave only        :no                   Device type        :BC
  Set port state    :no                   Local clock ID     :0aa1c6fffe699700
  Acl               :no                   Virtual clock ID   :no
  Acr               :no                   Time lock success  :no
  Asymmetry measure :disable              Passive measure    :disable

  BMC run info
  ------------------------------------------------------------------------------
  Grand clock ID    :0a05d7fffe341500               
  Receive number    :GigabitEthernet0/1/0           
  Parent clock ID   :0a05d7fffe341500               
  Parent portnumber :35585                          
  Priority1         :128                 Priority2           :128               
  Step removed      :0                   Clock accuracy      :0x31              
  Clock class       :187                 Time Source         :0xa0              
  UTC Offset        :35                  UTC Offset Valid    :False             
  Timescale         :PTP                 Time traceable      :False          
  Leap              :None                Frequency traceable :False          
  Offset scaled     :0xffff              Sync uncertain      :False           

  Port info
  Name                        State        Delay-mech Ann-timeout Type   Domain 
  ------------------------------------------------------------------------------
  GigabitEthernet0/1/0        slave        delay      3           BC     0

  Time Performance Statistics(ns): Slot 0  Card 1  Port 5 
  ------------------------------------------------------------------------------
  Realtime(T2-T1)   :20942575                Pathdelay     :0 
  Max(T2-T1)        :95695479
  Min(T2-T1)        :20942575

  Clock source info
  Clock     Pri1 Pri2 Accuracy Class TimeSrc  Signal Switch Direction In-Status
  ------------------------------------------------------------------------------
  local     128  128  0x31     187   0xa0     -      -      -         -
  bits1/11  128  128  0x20     6     0x20     1pps   off    in/-      normal
  bits1/12  128  128  0x20     6     0x20     1pps   off    in/-      normal
Run the display ptp interface interface-type interface-number command to view time synchronization information about the specified interface.
<HUAWEI> display ptp interface gigbitethernet0/1/0
  Port State :slave
  Port Number :7937
  Announce-interval :7
  Grand clock ID    :000000fffe111234
  Receive number    :GE0/1/0
  Parent clock ID   :000000fffe111234
  Parent portnumber :7426
  Priority1         :28         Priority2          :28
  Step removed      :0          Clock accuracy     :47
  Clock class       :55         Time Source        :160
  UTC Offset        :9          UTC Offset Valid   :True
  Time Scale        :PTP        Time Traceable     :False
  Leap              :None       Frequence Traceable:False

  Recv Packet Statistics
  -----------------------------------------------------------------------
  Announce               :1524       Sync                       :59920
  Req                    :0          Resp                       :1491
  Followup               :0          Pdelay_resp_followup       :0

  Send Packet Statistics
  -----------------------------------------------------------------------
  Announce               :56721      Sync                       :37793
  Req                    :1491       Resp                       :0
  Followup               :0          Pdelay_resp_followup       :0

  Discard Packet Statistics
  -----------------------------------------------------------------------
  Announce               :0          Sync                       :4247
  Delayreq               :0          Pdelayreq                  :0
  Resp                   :0          Pdelayresp                 :0
  Followup               :0          Pdelay_resp_followup       :0

Run the display smart-clock command to view information about the Atom GPS module on the specified interface.

  GigabitEthernet0/1/0 smart-clock info
  Work state
  ------------------------------------------------------------------------
  Time lock success :yes                Self-recovery enable :yes
  Freq lock success :yes                Self-recovering      :no

  Gnss info
  ------------------------------------------------------------------------
  Latitude          : 40 º3 '13"N      Altitude             : 65.37 (m)
  Longitude         : 116º10'44"E      Work mode            : auto
  Satellite number  : 7                 Leap second          : 17
  Satellite cno     : 28-16-46-41-27-26-25-0-0-0-0-0 (dbHz)

  Gps time          : 2016/07/08  07:26:52

  Sync parameter
  ------------------------------------------------------------------------
  Domain value      : 0                 Clock step           : one-step
  Priority1         : 0                 Delay mechanism      : delay
  Priority2         : 0                 Sync interval        : 3
  Clock class       : 6                 Announce interval    : 7
  SSM               : prc               Delay-req interval   : 7
  Clock ID          : bc620efffe4ed11f

  Board info
  ------------------------------------------------------------------------
  Version           : 1.0
  Mac address       : bc-62-0e-4e-d1-1f
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Updated: 2019-01-02

Document ID: EDOC1100058392

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