8600 Smart Routers Synchronization Configuration Guide 76.8600-50114I 12.05.2015 Document Information Revision History Document No Date Description of Changes 76.8600-50114I 12.05.2015 Added 8665 Smart Router synchronization functionality in: • 2.1 Equipment Clock • 2.1.1 Equipment Clock Architecture • 2.2 Reference Clock Inputs • 2.3 Station Clock Ports • 2.4 Synchronous Ethernet Interfaces • Packet Frequency Synchronization • Phase/Time Synchronization Changes or/and updates applied in: 2.3 Station Clock Ports, 2.4 Synchronous Ethernet Interfaces, Phase/Time Synchronization, Packet Phase/Time Synchronization and Frequency Synchronization Configuration Examples Reworked 2.1 Equipment Clock and 2.2 Reference Clock Inputs Added the following: • 4.1.1 8600 NEs Time Model • 4.2.4 PTP Profiles for Phase/Time • 5.2.4 Phase/Time Distribution (L3 Applications) • 6.4 PTP Monitoring Capabilities • 11.3 Phase/Time L3 Applications • ToD Frame and Messages • 4.2.3 PTP Fallback and 11.4 PTP Fallback Configuration 76.8600-50114H 04.11.2014 Added 8602-D and 8615 Smart Router synchronization functionality in: • 2.1.1 Equipment Clock Architecture • 2.2 Reference Clock Inputs • 2.3 Station Clock Ports • 2.4 Synchronous Ethernet Interfaces • Packet Frequency Synchronization • Phase/Time Synchronization Added 1.1 Synchronization Terminology Updates applied in 1.4 Packet Synchronization Overview Changes (node clock => equipment clock) applied in 2.1 Equipment Clock Reworked 2.4 Synchronous Ethernet Interfaces and added support of SyncE electrical SFP Changes applied in 3.1 8600 NEs Functionality Changes (node time => time clock) applied in 4.2 Time Clock Added support in IFC2 line card (with 8x100/1000BASE-X and 8x10/100/1000BASE-TX R2 IFMs) of L2 PTP slave and master in 3.1 8600 NEs Functionality and T-BC in Phase/Time Synchronization Updates applied in 11 Phase/Time Synchronization Configuration Examples 8600 Smart Routers Synchronization Configuration Guide 76.8600-50114I © 2015 Coriant This revision of the manual documents the following network elements and the corresponding feature packs or higher 8602 Smart Router FP7.0 8605 Smart Router FP1.6 8607 Smart Router FP1.1 8609 Smart Router, 8611 Smart Router FP7.0 8615 Smart Router FP7.0 8620 Smart Router FP4.1 8630 Smart Router, 8660 Smart Router FP7.0 8665 Smart Router FP7.0 If a different feature pack of 8600 Smart Routers is in use, please refer to the relevant product document program on the Coriant Portal by navigating to www.portal.tellabs.com > Product Documentation & Software> Data Networking > 8600 Smart Routers> Technical Documentation The functionality described in this document for 8615 Smart Router is also applicable to 8615 Smart Router stacked, unless otherwise stated © 2015 Coriant All rights reserved This manual is protected by U.S and international copyright laws, conventions and treaties Your right to use this manual is subject to limitations and restrictions imposed by applicable licenses and copyright laws Unauthorized reproduction, modification, distribution, display or other use of this manual may result in criminal and civil penalties The specifications and information regarding the products in this manual are subject to change without notice All statements, information, and recommendations in this manual are believed to be accurate but are presented without warranty of any kind, express or implied Users must take full responsibility for their application of any products Adobe ® Reader ® are registered trademarks of Adobe Systems Incorporated in the United States and/or other countries 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 8600 Smart Routers Synchronization Configuration Guide 76.8600-50114I © 2015 Coriant Document Information Terms and Abbreviations 76.8600-50114I © 2015 Coriant Term Explanation 1PPS One Pulse Per Second ACR Adaptive Clock Recovery or Adaptive Timing ADSL Asymmetric Digital Subscriber Line AJB Adaptive Jitter Buffer AMT Acceptable Master Table APTS Assisted Partial Timing Support ATM Asynchronous Transfer Mode BC Boundary Clock BITS Building Integrated Timing Systems BMCA Best Master Clock Algorithm BTS 2G Base Station CDC Control and DC Power Card There are two types of CDC: CDC1 and CDC2 CES Circuit Emulation Service CESoPSN Circuit Emulation Service over Packet-Switched Network CLI Command Line Interface CoMP Coordinated Multipoint CSID Clock Source ID Dave average minimum Delay DF Delay Floor DF RMS Delay Floor RMS DNC Digital Node Clock DSL Digital Subscriber Line DSLAM Digital Subscriber Line Access Multiplexer EC Equipment Clock EEC Ethernet Equipment Slave Clock G.8262 ek Instantaneous delay error ELC1 Ethernet Line Card in 8630 Smart Router, 8660 Smart Router ELP Ethernet Link Protection EPC Evolved Packet Core eNB Evolved NodeB (a.k.a eNodeB) ESF Extended Superframe ESMC Ethernet Synchronization Message Channel FBL Fallback List 8600 Smart Routers Synchronization Configuration Guide Document Information FDD Frequency Division Duplex FE Fast Ethernet FOPS Full On-Path Support GE Gigabit Ethernet GLONASS Globalnaya Navigatsionnaya Sputnikovaya Sistema, i.e Global Navigation Satellite System GMC Grand Master Clock GNSS Global Navigation Satellite Systems GPS Global Positioning System G.SHDSL An International standard for SHDSL GW Gateway IFC Interface Module Concentrator is the line card baseboard IFC line card The IFC line card in 8630 Smart Router and 8660 Smart Router and consists of an IFC and up to two IFMs There are two types of IFC line cards: IFC1 and IFC2 IFM Interface Module IP Internet Protocol LAG Link Aggregation LAN Local Area Network LTE Long Term Evolution LTE-A LTE-Advanced LU1 Line Unit in 8665 Smart Router MEO Medium Earth Orbits MCX Micro Coaxial MGMT Management Port in 8600 NEs MLPPP Multilink PPP MME Mobility Management Entity MPLS Multiprotocol Label Switching MS-AIS Multiplex Section Alarm Indication Signal MTIE Maximum Time Interval Error NE Network Element NTR Network Timing Reference OAM Operations, Administration and Maintenance OCXO Oven Controlled Oscillator OSSP Organizational Specific Slow Protocol OTN Optical Transport Network OUI Organizational Unique Identifier - ITU-T has a 3-octet IEEE assigned Organizationally Unique Identifier (OUI), that is used to provide Quality Level information over Synchronous Ethernet 8600 Smart Routers Synchronization Configuration Guide 76.8600-50114I © 2015 Coriant Document Information 76.8600-50114I © 2015 Coriant PDN GW Packet Data Network Gateway (a.k.a P-GW) PDV Packet Delay Variation PDH Plesiochronous Digital Hierarchy PDU Protocol Data Unit PEC Packet Equipment Clock PPP Point-to-Point Protocol pps Packet Per Second PHP Penultimate Hop Popping POPS Partial On-Path Support ppb parts-per-billion ppm parts-per-million PRC Primary Reference Clock PRS Primary Reference Source PRTC Primary Reference Time Clock PTP Precision Time Protocol PTSF Packet Timing Signal Fail PWE3 Pseudowire Emulation Edge to Edge QL Quality Level QoS Quality of Service RMS Root Mean Square RNC Radio Network Controller RX Receive, Receiver SASE Stand Alone Synchronization Equipment SAToP Structure-Agnostic Time Division Multiplexing over Packet SCI Station Clock Input SCI Station Clock Interface SCM Switching Control Module used in the 8611 Smart Router SCO Station Clock Output SDH Synchronous Digital Hierarchy SEC SDH Equipment Clock SETG Synchronization Equipment Timing Generator SEM Synchronous Ethernet Master S-GW Serving Gateway SHDSL Symmetrical High-speed Digital Subscriber Line SLA Service Level Agreement SONET Synchronous Optical Network SSM Synchronization Status Messages 8600 Smart Routers Synchronization Configuration Guide Document Information SSU Synchronization Supply Unit SyncE Synchronous Ethernet T-BC Telecom Boundary Clock TC Transparent Clock TDD Time Division Duplex TDM Time-Division Multiplexing T-GM Telecom Grand Master TIE Time Interval Error TLV Type Length Value ToD Time of Day T-TSC Telecom Time Slave Clock TX Transmit, Transmitter UDP User Datagram Protocol VLAN Virtual LAN VRF Virtual Routing and Forwarding VSCI Virtual SCI WTR Wait-to-Restore xDSL A collective term referring to any of the various types of DSL technologies 8600 Smart Routers Synchronization Configuration Guide 76.8600-50114I © 2015 Coriant Table of Contents Table of Contents About This Manual 13 Objectives 13 Audience 13 8600 Smart Routers Technical Documentation 13 Interface Numbering Conventions 17 Document Conventions 17 Documentation Feedback 17 8600 Smart Routers Discontinued Products 18 Network Synchronization Evolution 19 1.1 1.2 1.3 1.4 1.5 Synchronization Terminology 19 Synchronization with 8600 Network Elements 20 Reference Clock Distribution 21 1.3.1 Traditional Distribution Schemes 21 1.3.2 Synchronous Ethernet 24 Packet Synchronization Overview 26 1.4.1 Synchronization Flow 28 1.4.2 Phase/Time Synchronization 29 GNSS Synchronization 31 Physical Layer Frequency Synchronization 34 2.1 2.2 2.3 2.4 2.5 76.8600-50114I © 2015 Coriant Equipment Clock 34 2.1.1 Equipment Clock Architecture 35 2.1.2 Holdover and Freerun 36 Reference Clock Inputs 36 Station Clock Ports 37 2.3.1 Limitations and Restrictions 38 Synchronous Ethernet Interfaces 39 2.4.1 SyncE Interfaces Capability 39 2.4.2 Synchronous Ethernet in Ring Topologies 42 2.4.3 SyncE Master Applications 45 2.4.4 Limitations and Restrictions 46 Clock Selection Algorithm 47 2.5.1 Quality Levels 48 8600 Smart Routers Synchronization Configuration Guide Table of Contents 2.6 Packet Frequency Synchronization 52 3.1 3.2 3.3 3.4 3.5 4.2 8600 NEs Capabilities 72 4.1.1 8600 NEs Time Model 73 Time Clock 74 4.2.1 Local Time Interface 75 4.2.2 GNSS Interface 77 4.2.3 PTP Fallback 78 4.2.4 PTP Profiles for Phase/Time 79 4.2.5 Multicast PTP Messages Exchange 80 4.2.6 Time Selection Algorithm 81 Packet Phase/Time Synchronization 83 5.1 5.2 8600 NEs Functionality 52 Adaptive Timing (CES) 53 3.2.1 ACR From TDM PWE3 54 3.2.2 PDV Problem 55 3.2.3 Jitter Buffer Operation 57 3.2.4 Jitter Buffer Configuration 59 3.2.5 ACR Sources of Wander 60 3.2.6 Limitations and Restrictions 62 PTP Frequency Synchronization 62 3.3.1 PTP Frequency Telecom Profile 63 3.3.2 PTP Frequency Telecom Application 64 3.3.3 PTP Messages Exchange 65 3.3.4 PTP Clock Selection and Protection 66 PEC Performance 69 3.4.1 Temperature Stability 70 Typical ACR Performance 70 Phase/Time Synchronization 72 4.1 2.5.2 Node Timing from Input Port 48 2.5.3 Synchronization from Co-Located Equipment 49 2.5.4 Connecting to Local Synchronization Equipment (BITS or SASE) 50 Loop Timing 51 T-BC Distribution Model 83 Mobile Networks Phase/Time Application 85 5.2.1 Central Phase/Time Distribution 85 5.2.2 Hybrid Synchronization Distribution on the Edge 87 5.2.3 Phase/Time Distribution (L2 Applications) 87 5.2.4 Phase/Time Distribution (L3 Applications) 88 5.2.5 Combined Synchronization Distribution Methods 90 Monitoring Synchronization 91 8600 Smart Routers Synchronization Configuration Guide 10 76.8600-50114I © 2015 Coriant 11 Phase/Time Synchronization Configuration Examples Fig 78 Node T-BC-2 Phase/Time L3 Status 8600 Smart Routers Synchronization Configuration Guide 154 76.8600-50114I © 2015 Coriant 11 Phase/Time Synchronization Configuration Examples Fig 79 Node T-BC-3 Phase/Time L3 Status 11.4 PTP Fallback Configuration This chapter provides an example showing how to use PTP fallback to protect the primary time source input in L2 PTP application, which is depicted below 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 155 11 Phase/Time Synchronization Configuration Examples Fig 80 PTP Fallback Configuration Topology The configuration tasks required are outlined below: 8600 Smart Routers Synchronization Configuration Guide 156 76.8600-50114I © 2015 Coriant 11 Phase/Time Synchronization Configuration Examples • NODE1 (T-GM-1): • Setting of PTP profile • Setting of the time interface (1PPS/ToD) mode • Setting the master clock time source • Enable Virtual Station Clock Input (VSCI) • Configuring the operation of downstream port(s): • Setting the MAC multicast address type, which must be the same in all downstream node • NODE2 (T-BC/T-GM): • Setting of PTP profile • Configure GNSS interface: • Interface de-provisioning • Enable GNSS interface operation • Enable Virtual Station Clock Input (VSCI) • Setting the master clock time source input for PTP fallback operation There are two options available and explained below: Parameter Description 1588-slave-or-pps This option sets a selection of either PTP slave or 1PPS interface based on the BMCA decision 1588-slave-or-gnss This option sets a selection of either PTP slave or GNSS clock source based on the BMCA decision • Setting the operation mode of the downstream ports: • Setting the MAC multicast address type, which must be the same in all downstream node 11.4.1 NODE1 (T-GM) Configuration Step Set the PTP profile to G.8275.1 NODE-1(config)# node-timing ieee1588 profile G.8275.1 Step Set the time interface (1PPS) mode to input NODE-1(config)# node-timing PPS if-mode input Step Set the master clock time source input to 1PPS NODE-1(config)# node-timing ieee1588 master clock-source pps Step Enable the VSCI NODE-1(config)# node-timing ieee1588 slave enable-sci Step Set the operation mode of the downstream port NODE-1(config)# interface ge 13/1/0 NODE-1(cfg-if[ge13/1/0])# node-timing ieee1588 clock-if mode master NODE-1(cfg-if[ge13/1/0])# node-timing ieee1588 clock-if multicast-address forwardable 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 157 11 Phase/Time Synchronization Configuration Examples NODE-1(cfg-if[ge13/1/0])# no shutdown NODE-1(cfg-if[ge13/1/0])# exit 11.4.2 NODE2 Configuration Step Set the PTP profile to G.8275.1 NODE-2(config)# node-timing ieee1588 profile G.8275.1 Step Remove all services from the interface to be used for GNSS connectivity NODE-2(config)# interface ge 4/0 NODE-2(cfg-if[ge4/0])# shutdown-if NODE-2(cfg-if[ge4/0])# exit Step Plug in GNSS SFP module to the selected interface and enable GPS receiver NODE-2(config)# node-timing gnss interface ge 4/0 NODE-2(config)# node-timing gnss type gps NODE-2(config)# node-timing gnss enable Step Set the master clock time source input In this example, it is set to PTP or GNSS NODE-2(config)# node-timing ieee1588 master clock-source 1588-slave-or-gnss Step Enable the VSCI NODE-2(config)# node-timing ieee1588 slave enable-sci Step Set the operation mode of the upstream port towards NODE1 NODE-2(config)# interface ge 5/0 NODE-2(cfg-if[ge5/0])# node-timing ieee1588 clock-if mode auto NODE-2(cfg-if[ge5/0])# node-timing ieee1588 clock-if multicast-address forwardable NODE-2(cfg-if[ge5/0])# no shutdown NODE-2(cfg-if[ge5/0])# exit Step Set the operation mode of the downstream ports towards T-TSC nodes NODE-2(config)# interface ge 1/0 NODE-2(cfg-if[ge1/0])# node-timing ieee1588 clock-if mode master NODE-2(cfg-if[ge1/0])# node-timing ieee1588 clock-if multicast-address forwardable NODE-2(cfg-if[ge1/0])# no shutdown NODE-2(cfg-if[ge1/0])# exit NODE-2(config)# interface ge 2/0 NODE-2(cfg-if[ge2/0])# node-timing ieee1588 clock-if mode master NODE-2(cfg-if[ge2/0])# node-timing ieee1588 clock-if multicast-address forwardable NODE-2(cfg-if[ge2/0])# no shutdown NODE-2(cfg-if[ge2/0])# exit 8600 Smart Routers Synchronization Configuration Guide 158 76.8600-50114I © 2015 Coriant Network Synchronization Configuration Listings Network Synchronization Configuration Listings Synchronization Configuration Snapshots This chapter provides a complete set of the configuration snapshots of the network presented in Fig 46 NODE-1 # Interfaces configuration interface xe3/0/0 description Primary Link to NODE-3:xe5/0/0 no shutdown clock-source-id 3000 ! interface xe7/0/1 description Secondary Link to NODE-3:xe3/0/1 no shutdown clock-source-id 3000 ! interface xe8/0/0 description Primary Link to NODE-2:xe7/0/0 no shutdown clock-source-id 2000 ! interface xe6/0/1 description Secondary Link to NODE-2:xe3/0/1 no shutdown clock-source-id 2000 ! interface lo0 description Protocol Loopback no shutdown ip address 10.10.30.1/32 ! # Timing configuration node-timing clock-source so5/0/0 priority node-timing clock-source so4/0/0 priority ! ! NODE-2 # Interfaces configuration interface xe7/0/0 description Primary Link to NODE-1:xe8/0/0 no shutdown clock-source-id 1000 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 159 Network Synchronization Configuration Listings ! interface xe3/0/1 description Secondary Link to NODE-1:xe6/0/1 no shutdown clock-source-id 1000 ! interface xe4/0/0 description Primary Link to NODE-3:xe4/0/0 no shutdown clock-source-id 3000 ! interface xe8/0/1 description Secondary Link to NODE-3:xe6/0/1 no shutdown clock-source-id 3000 ! interface ge5/1/0 description Link to NODE-5:ge2/4/0 no shutdown ! interface lo0 description Protocol Loopback no shutdown # Timing configuration node-timing sco if-mode e1 node-timing sco selection-process node-timing enable-sci node-timing enable-sci 14 node-timing sci if-mode e1 node-timing sci 14 if-mode e1 node-timing quality-level ql-prc sci 14 node-timing quality-level-overwrite sci 14 node-timing quality-level ql-prc sci node-timing quality-level-overwrite sci node-timing clock-source sci14 priority node-timing clock-source sci1 priority node-timing clock-source xe7/0/0 priority node-timing clock-source xe3/0/1 priority node-timing clock-source xe4/0/0 priority node-timing sco clock-source xe7/0/0 priority node-timing sco clock-source xe3/0/1 priority node-timing sco clock-source xe4/0/0 priority node-timing sco clock-source xe8/0/1 priority ! ! NODE-3 # Interfaces configuration interface xe5/0/0 description Primary Link to NODE-1:xe3/0/0 no shutdown clock-source-id 1000 ! 8600 Smart Routers Synchronization Configuration Guide 160 76.8600-50114I © 2015 Coriant Network Synchronization Configuration Listings interface xe3/0/1 description Secondary Link to NODE-1:xe7/0/1 no shutdown clock-source-id 1000 ! interface xe4/0/0 description Primary Link to NODE-2:xe4/0/0 no shutdown clock-source-id 2000 ! interface xe6/0/1 description Secondary Link to NODE-2:xe8/0/1 no shutdown clock-source-id 2000 ! interface ge8/0/7 description Link to Access Network no shutdown ! interface ge8/1/1 description Link to GMC no shutdown ! interface lo0 description Protocol Loopback no shutdown ip address 10.10.30.3/32 ! # Timing configuration node-timing clock-source node-timing clock-source node-timing clock-source node-timing clock-source ! ! xe5/0/0 xe3/0/1 xe4/0/0 xe6/0/1 priority priority priority priority NODE-4 # Interfaces configuration interface ge2/1 description Link to Access Network no shutdown ! interface lo0 description Protocol Loopback no shutdown ip address 10.10.30.4/32 ! # Timing configuration node-timing ieee1588 slave msg-source lo0 node-timing ieee1588 slave clock-domain ! 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 161 Network Synchronization Configuration Listings node-timing 128pps node-timing 128pps ! node-timing period 100 node-timing period 100 ! node-timing node-timing ! node-timing node-timing node-timing ! ! ieee1588 slave acceptable-master 10.30.100.1 rate ieee1588 slave acceptable-master 10.30.102.1 rate ieee1588 slave monitor delay-variation 10.30.100.1 ieee1588 slave monitor delay-variation 10.30.102.1 ieee1588 slave enable-sci master 10.30.100.1 ieee1588 slave enable-sci master 10.30.102.1 clock-source 1588-sci master 10.30.100.1 priority clock-source 1588-sci master 10.30.102.1 priority wtr-time NODE-5 # Interfaces configuration interface ge2/4/0 description Link to NODE-2:ge5/1/0 no shutdown ! interface ge2/5/1 description Link to GMC no shutdown ! interface ge2/5/0 description Link to Access Network no shutdown ! description Protocol Loopback no shutdown ip address 10.10.30.5/32 ! # Timing configuration node-timing ieee1588 slave msg-source lo0 node-timing ieee1588 slave clock-domain ! node-timing ieee1588 slave acceptable-master 10.30.100.1 rate 128pps node-timing ieee1588 slave acceptable-master 10.30.102.1 rate 128pps ! node-timing ieee1588 slave enable-sci ! node-timing ieee1588 slave sci-monitor enable reference-clock ge2/4/0 node-timing ieee1588 slave sci-monitor monitoring-period 60 ! node-timing clock-source ge2/4/0 priority node-timing clock-source 1588-sci priority 8600 Smart Routers Synchronization Configuration Guide 162 76.8600-50114I © 2015 Coriant Network Synchronization Configuration Listings node-timing wtr-time ! ! 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 163 Troubleshooting Synchronization Problems Troubleshooting Synchronization Problems Physical Layer Synchronization Introduction An overview of mobile backhaul network synchronization principles and a detailed description of the 8600 Network Element Clock are outlined in Network Synchronization Evolution and Physical Layer Frequency Synchronization Faults Name Description Cause Excessive frequency offset This fault is active if the selected reference clock frequency exceeds the pull-in range of the Node clock Typically this is an indication that the synchronization chain between the master (PRC) clock and the 8600 Node clock is not complete, i.e all the clocks on the path are not PRC traceable As a result the reference clock offset exceeds the tolerable limits Another possible cause is an equipment or connection failure Excessive jitter This fault is active if the jitter of the selected reference clock signal exceeds the PLL range Typically this is a sign of synchronization network problem Loss of timing input This fault is active if the Node clock is not receiving a valid clock signal from a reference clock that is on the fallback list Typically this is an indication that the synchronization chain between the master (PRC) clock and the 8600 Node clock has been cut at some point or that the traceability has been lost, i.e insufficient quality-level Another possible cause is a connection/connector failure or a hardware malfunction Troubleshooting Step Verify that the reference clock connection is not cut and that the reference clock port is operating in correct mode The following commands can be used: • show node-timing • show interface command, e.g.: • show interface pdh slot/module/if - in the 8630 Smart Router and 8660 Smart Router • show interface pdh module/if - in the 8605 Smart Router, 8607 Smart Router, 8609 Smart Router, 8611 Smart Router and 8620 Smart Router 8600 Smart Routers Synchronization Configuration Guide 164 76.8600-50114I © 2015 Coriant Troubleshooting Synchronization Problems Step In case the clock quality-levels are in use, verify that the reference clock has an acceptable quality-level Check the existing clocks list, fallback clock list and possible quality level overwrite configuration The following commands can be used: • show node-timing • show run | block timing Step Verify that there are no hardware related faults active on the 8600 NE E.g line card/CDC/SCM/IF providing the reference clock to the Node clock: • Use show node-timing and show faults active to determine the port of the reference clock having the issue and to see if there is an active hardware fault • In case of a hardware fault, please contact Tellabs Technical Support Step If available, try to use another clock source as the reference Step Go through the network synchronization plan and follow the synchronization chain from 8600 NEs towards the PRC: • Verify that each clock on the path is in locked state • In case the quality-levels are in use, verify that each node on the path is traceable to the PRC • Check proper attachment of the reference clock port connector Packet Synchronization Adaptive Clock Recovery The synchronization method used in both adaptive timing and PTP slave clock is known as Adaptive Clock Recovery (ACR) As this method is packet based, the synchronization planning and troubleshooting requires some background in the ACR method and understanding the phenomena affecting the PSN packet delay variation (PDV) To minimize the impact of PDV for ACR, note the following: • The packet timing flows (CES or PTP) should always be mapped to EF (or even CS7) • Shaping of packet timing flows destroys the timing information as the packets are re-timed with the shaper clock • Routing changes (or repeated path changes due to load balancing, Ethernet link aggregation etc.) affect the ACR performance negatively if they happen frequently (more than once every 15 minutes) • Systematic PDV - typical for Ethernet over SDH, TDM radio links and some xDSL implementations may cause false routing change detections if the delay transient threshold is set too low Adaptive Timing Introduction The 8600 system adaptive timing synchronization methods are outlined in 3.2 Adaptive Timing (CES) 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 165 Troubleshooting Synchronization Problems It is important to note that, contrary to the other synchronization methods available in the 8600 NEs, adaptive timing from a TDM PWE3 is operating at the TDM-port level and as such is not to be used for node clock synchronization The recovered E1/T1 clock always follows the remote-end attachment circuit clock, not the remote-end Node clock In typical mobile backhaul applications these clocks are traceable to the same source, but this is not always the case Faults Name Description Cause Loss of adaptive timing The fault is on, if adaptive timing has been configured but it has not yet reached the “locked” state, or adaptive timing has reached the locked state but for some reasons the “lock” has been lost for an extended period of time Excessive PDV on the CES path Adaptive timing low input quality The adaptive timing input quality (i.e the delay floor noise) exceeds the user configured limit (default 10 microseconds) Excessive PDV on the CES path Troubleshooting Step Verify that the link is not down and check the PWE3 connectivity The following commands can be used: • show ip interface brief • show ip route • show pwe3 forwarding Step Check the TDM PWE3 counters and adaptive timing status The following command can be used: • show interface command, e.g.: • show interface pdh slot/module/if - in the 8630 Smart Router and 8660 Smart Router • show interface pdh module/if - in the 8605 Smart Router, 8607 Smart Router, 8609 Smart Router, 8611 Smart Router and 8620 Smart Router PTP Synchronization Introduction A detailed overview of the Precision Timing Protocol (PTP) synchronization in telecommunications application, PTP slave clock synchronization principles and available synchronization performance monitoring features are outlined in 3.3 PTP Frequency Synchronization It is important to note that in a PTP slave configuration there are always two clocks in the system, i.e Node clock and PTP slave clock: 8600 Smart Routers Synchronization Configuration Guide 166 76.8600-50114I â 2015 Coriant Troubleshooting Synchronization Problems The PTP slave clock, which is recovering the timing information from the PTP packets with the Adaptive Clock Recovery (ACR) method • The PTP slave provides one or more virtual SCIs for the Node clock of which only one can be selected at a time • The Node clock (a.k.a node-clock) which sees the virtual SCI as just another reference clock and operates according to the rules determined by the fallback list priorities, reference clock status and quality-level Faults Name Description Cause Low packet rate This fault is displayed when a clock suffers low packet rate Either the PTP master sends too few packets or excessive packet loss in network The PTP event messages (Sync and Delay_Request, UDP port 319) are experiencing more than 10% of packet loss in both traffic directions Loss of announce This fault is displayed when no PTP announce messages (UDP port 320) are received from PTP master Announce messages are dropped in the network, or the PTP master has stopped sending them or there is routing/firewall issue Loss of signal (virtual SCI) This fault is displayed when the virtual SCI clock (slave output) is considered failed The PTP slave holdoff time has expired, or the PTP slave has not yet recovered the clock Low input quality This fault is displayed when the input quality is lowered due to packet delay variation The PTP slave input quality (i.e the aggregate delay floor noise) exceeds the user configured limit (default 10 microseconds) Mask crossed This fault is displayed when the output MTIE of the monitored PTP slave clock crosses the user configured reference mask (default G.8261.1) The PTP slave output wander exceeds user configured MTIE limit Troubleshooting Step Verify that the link is not down and check the IP connectivity The following commands can be used: • show ip interface brief • show ip route 76.8600-50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 167 Troubleshooting Synchronization Problems Step Check PTP connectivity: • Check the PTP statistics (preferably couple of times in sequence) • show node-timing ieee1588 slave • Announce, Signaling and Delay_Response messages may be dropped in the PSN due to UDP port 320 being blocked: • Check also from the PTP master side that it is receiving the Signaling messages from the PTP slave (assuming unicast message negotiation is used, which is on by default) • Likewise, the Sync and Delay_Request messages may be dropped in the PSN if UDP port 319 is blocked • If Sync messages are received, but the rate is too low (below the requested pps; low packet rate fault is on) the problem is most likely on the PSN side, for example due to congestion, rate-limitation or some other bottlenecks on the PTP master to PTP slave path • If the PTP master is sending messages, but these are dropped at the PTP slave: • The PTP clock domain differs from the one set at the PTP master Set the PTP slave clock domain to be the same as the PTP master clock domain with the node-timing ieee1588 slave clock-domain command • The PTP message header information is not in accordance to the IEEE1588-2008 specification, or the messages are being corrupted in the PSN • Announce messages are received but the PTP slave does not request Sync and Delay_Request messages (no grant): • The clockClass is insufficient • No priority has been set for the virtual SCI • Announce messages are otherwise corrupted • If the node-timing quality-levels are enabled (default) the PTP clock class may be insufficient for the clock recovery: • The quality-level derived from the PTP clock class is shown on the existing clocks list (show node-timing) • Only PRC (clockClass = 84, ETSI mode), or Primary Reference Source (PRS) (clockClass = 80, ANSI mode) and Stratum (clockClass = 86, ANSI mode) are accepted • Typically, the clock class is insufficient if the master is in holdover and thus not offering high quality synchronization reference • Loss of PTP connectivity may also be caused by the PTP master not being configured correctly or operating improperly Please consult the PTP master clock vendor’s documentation and/or support services 8600 Smart Routers Synchronization Configuration Guide 168 76.8600-50114I © 2015 Coriant ... and/or other countries 76. 8600- 50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 8600 Smart Routers Synchronization Configuration Guide 76. 8600- 50114I © 2015 Coriant... fi-documentation@tellabs.com 76. 8600- 50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 17 8600 Smart Routers Discontinued Products 8600 Smart Routers Discontinued Products 8600 Smart Routers. .. > 8600 Smart Routers > Technical Documentation 76. 8600- 50114I © 2015 Coriant 8600 Smart Routers Synchronization Configuration Guide 13 About This Manual Document Title Description 8600 Smart Routers