Network-clock synchronization PSTN

[Thomas P]

Hello,

I have an issue to synchronize the network clock of my ISR 4321 with my operator.

Here is the configuration in place:

controller E1 0/1/0
 framing no-crc4
 clock source line primary
 pri-group timeslots 1-31

!

network-clock synchronization automatic
network-clock input-source 1 controller E1 0/1/0

The result of the show network-clock command:

There are no network clock sources configured
 Active source = UNAVAILABLE


 All Network Clock Configuration
---------------------------------
 Priority  Clock Source             State                         Reason

 Current operating mode is Revertive

 Current OOR Switchover mode is Switchover


There are no slots disabled from participating in network clocking

Is there a command missing?

Thanks for your help.

Thomas.

[Deepak Mehta]

These two commands is configured on my set up and works good.

network-clock-select 1 {E1|T1}  0/1/0  -it will select which priority interface will be used for taking clock.

clock source line -  take the clock from the service the service prvoider. 

[Thomas P]

Hello,

Thanks you for your reply but these commands are not present on Cisco ISR 4321.

[Deepak Mehta]

ah for 4300 series commands have changed a little.

The commands which you have applied are correct and you can also include below to synchronize individual channels.

network-clock synchronization participate slot / subslot

Below samples config

Sample Configuration

card type t1 0 2
card type t1 0 3
!
isdn switch-type primary-5ess
!
network-clock synchronization automatic >>>>>>>>>>>>>>>>>
network-clock synchronization participate 0/2>>>>>>>>>>>>>>>
!
voice-card 0/2
  dsp services dspfarm
  no watchdog
!
controller T1 0/2/0
  framing esf
  linecode b8zs

  clock source line primary

  network-clock input-source 1 controller t1 0/2/0>>>>>>>>>>>>>>>>>>
  cablelength long 0db
  pri-group timeslots 1-24 voice-dsp

[Thomas P]

Hello,

When I enter your command, I have the following:

Router(config)#network-clock synchronization participate 0/1
Slot 0 subslot 1 is already enabled for network clocking. Command Aborted.

[Deepak Mehta]

Try " clock source network" first and see if it works.

Also try below inside the controller interface.Thanks

network-clock input-source 1 controller t1 0/1/0

[Thomas P]

The router doesn't accept the commands:

Router(config)#clock source network ?
% Unrecognized command
Router(config)#controller E1 0/1/0
Router(config-controller)#?
Controller configuration commands:
  ais-shut          Send LAIS when shutdown
  bert              Start BERT test
  channel-group     Specify the timeslots to channel-group mapping for an interface
  clock             Specify the clock source for a DS1 link
  default           Set a command to its defaults
  description       Controller specific description
  ds0-group         Configure group of timeslots to a particular signaling type
  exit              Exit from controller configuration mode
  framing           Specify the type of Framing on a E1 link
  help              Description of the interactive help system
  line-termination  Specify the line termination for E1
  linecode          Specify the line encoding method for a E1 link
  logging-events    LOG E1 Events
  loopback          Put the entire E1 line into loopback
  national          Set E1 National Reserve Bits.
  no                Negate a command or set its defaults
  pri-group         Configure the specified timeslots for PRI
  shutdown          Shut down a E1 link (send Blue Alarm)
  snmp              Modify SNMP controller parameters
  tdm-group         Configure DS0 group for TDM
  trunk-group       Configure interface to be in a trunk group

Here are the logs I see time to time:

Apr 20 17:26:36.975: %NETCLK-6-SRC_UPD: Synchronization source E1 0/1/0 status (Signal Failure clear) is posted to all selection process.
Apr 20 17:26:36.975: %NETCLK-6-SRC_UPD: Synchronization source E1 0/1/0 status (Critical Alarms clear) is posted to all selection process.
Apr 20 17:26:36.977: %NETCLK-6-SEL_CLOCK_SRC: Synchronization source E1 0/1/0 is selected by selection process(T0) to synchronize the system and generate T0 output.

[Deepak Mehta]

You need to type the clock source command inside controller config.

What you have given isn't correct."Router(config)#clock source network ?" 

Please go in controller config and then enter

Router(config)# controller t1 0/1/1

Router(config-controller)# clock source network

[Thomas P]

I entered your command:

Router(config)#controller E1 0/1/0
Router(config-controller)#clock source network

This command replace the command clock source line primary I had before.

It doesn't seem to work better:

Router#sh network-clocks synchronization
Symbols:     En - Enable, Dis - Disable, Adis - Admin Disable
             NA - Not Applicable
             *  - Synchronization source selected
             #  - Synchronization source force selected
             &  - Synchronization source manually switched

Automatic selection process : Enable
Equipment Clock : 2048 (EEC-Option1)
Clock Mode : QL-Disable
ESMC : Disabled
SSM Option : 1
T0 : Internal
Hold-off (global) : 300 ms
Wait-to-restore (global) : 300 sec
Tsm Delay : 180 ms
Revertive : No

Nominated Interfaces

 Interface            SigType     Mode/QL      Prio  QL_IN  ESMC Tx  ESMC Rx
*Internal             NA          NA/Dis       251   QL-SEC    NA        NA
 E1 0/1/0             NA          NA/Dis       1     QL-FAILED NA        NA

With the clock source line primary command:

Router#sh network-clocks synchronization
Symbols:     En - Enable, Dis - Disable, Adis - Admin Disable
             NA - Not Applicable
             *  - Synchronization source selected
             #  - Synchronization source force selected
             &  - Synchronization source manually switched

Automatic selection process : Enable
Equipment Clock : 2048 (EEC-Option1)
Clock Mode : QL-Disable
ESMC : Disabled
SSM Option : 1
T0 : E1 0/1/0
Hold-off (global) : 300 ms
Wait-to-restore (global) : 300 sec
Tsm Delay : 180 ms
Revertive : No

Nominated Interfaces

 Interface            SigType     Mode/QL      Prio  QL_IN  ESMC Tx  ESMC Rx
 Internal             NA          NA/Dis       251   QL-SEC    NA        NA
*E1 0/1/0             NA          NA/Dis       1     QL-SEC    NA        NA

Thank you for your help.

[Deepak Mehta]

Try to bounce ( shut/no shut) the E1 controller .

Can you paste "sh controller e1"  output.Thank you

[Thomas P]

Following, the requested output:

Router#sh controllers E1 0/1/0
E1 0/1/0 is up.
  Applique type is Channelized E1 - balanced
  Description: *** E1/T2 SFR 3 ***
  No alarms detected.
  alarm-trigger is not set
  Framing is no-crc4, Line Code is HDB3, Clock Source is Network.
  International Bit: 1, National Bits: 11111
  Data in current interval (190 seconds elapsed):
     0 Line Code Violations, 29 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     28 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

[Deepak Mehta · Accepted solution]

29th Path code violations --- looks to be framing issue between you and service provider.

Please check with your service provide as framing issue can affect the clock syncronization.

[Aman Soi]

Hi Thomas,

Do you get the below command under controller ?

network-clock input-source priority controller [t1|e1] slot/bay/port

can u share show inventory /show diag?

regds,

aman

[Thomas P]

Hello,

I can't enter this command:

Router(config)#controller E1 0/1/0
Router(config-controller)#?
Controller configuration commands:
  ais-shut          Send LAIS when shutdown
  bert              Start BERT test
  channel-group     Specify the timeslots to channel-group mapping for an interface
  clock             Specify the clock source for a DS1 link
  default           Set a command to its defaults
  description       Controller specific description
  ds0-group         Configure group of timeslots to a particular signaling type
  exit              Exit from controller configuration mode
  framing           Specify the type of Framing on a E1 link
  help              Description of the interactive help system
  line-termination  Specify the line termination for E1
  linecode          Specify the line encoding method for a E1 link
  logging-events    LOG E1 Events
  loopback          Put the entire E1 line into loopback
  national          Set E1 National Reserve Bits.
  no                Negate a command or set its defaults
  pri-group         Configure the specified timeslots for PRI
  shutdown          Shut down a E1 link (send Blue Alarm)
  snmp              Modify SNMP controller parameters
  tdm-group         Configure DS0 group for TDM
  trunk-group       Configure interface to be in a trunk group
Router(config-controller)#network-clock input-source priority controller E1 0/1/0
                                    ^
% Invalid input detected at '^' marker.

Attached, the requested show commands.

Thank you for your help.

[Aman Soi]

Hi Thomas,

I was just referring this link where the command is appearing. even link says

"When the NIM is used for voice applications, all voice T1/E1s have to be synchronized to a single clock source and any difference in clocks risk clock slips or interface flaps"

What is show version of router?

http://www.cisco.com/c/en/us/support/docs/routers/4000-series-integrated-services-routers/118792-config-isr-00.html

card type { t1 | e1 } slot subslot

network-clock synchronization automatic

network-clock synchronization participate slot / subslot

voice-card slot
   codec complexity { flex [ reservation-fixed { high | medium }]
| high | medium | secure }

controller { t1 | e1 } slot / subslot / port
   framing {sf | esf}
   or
   framing {crc4 | no-crc4}

   linecode {ami | b8zs}
   or
   linecode { ami | hdb3 }

   network-clock input-source priority controller [t1|e1] slot/bay/port

   pri-group timeslots timeslot-range [ nfas_d | service ][voice-dsp]

regds,

aman