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Class C/D Boundary Clocks (T-BCs) are being used to meet the strict time synchronization requirements needed by modern, highly time-sensitive networks, such as 5G. |
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While several metrics have defined limits for Class C T-BCs in ITU-T G.8273.2, giving a clear overview of which requirements need to be met, this is not yet the case for Class D. Only one requirement is specified in ITU-T G.8273.2, section 7.1, table 7-2: a low-pass filtered maximum absolute time error of (max|TE,,L,,| ≤ 5 ns). |
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The performance of the devices this year showed improvement over those tested in previous years: every T-BC tested this year was with a big margin within the threshold of the Class D performance limit of (max|TE,,L,,| ≤ 5 ns). |
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For the first time at EANTC, we also tested Time Synchronization over 800GE links for the Juniper PTX10002-36QDD using the Calnex Paragon-Neo S, which was also successfully executed and within the Class D performance limit. |
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Additionally, all devices were successfully tested for the Class C conformance test this year. |
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[[Figure 100: Conformance Class C/D Testing - Setup>>image:434069186562949121_5.07-5.08.png||alt="Figure 100" width="550"]] |
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The setup of both test cases consisted of an emulated Grandmaster (T-GM ) and an emulated Slave Clock (SC), with the T-BC under test being located in between them. |
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While these tests were not interoperability tests, they were still of utmost importance as further tests require either the Class C or Class D qualifications. |
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{{container cssClass="tc-role-table"}} |
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|=T-BC-1|=T-GM-A |
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|Juniper PTX10002-36QDD|Calnex Paragon-neo S |
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Table 55: Conformance Test Telecom Boundary Clock Class C/D - Class D Conformance Test - 800G Port Speed |
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{{/container}} |
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{{container cssClass="tc-role-table"}} |
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|=T-BC-1|=T-GM-A |
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|Arrcus S9600-72XC|Calnex Paragon-neo PAM4 |
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|Ciena 5134|Keysight Time Sync Analyzer |
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|Ericsson Router6676|Keysight Time Sync Analyzer |
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|Huawei ATN 910D-A|Keysight Time Sync Analyzer |
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|Juniper ACX7024|Keysight Time Sync Analyzer |
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|Juniper ACX7100-32C|Keysight Time Sync Analyzer |
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|Juniper ACX7348|Keysight Time Sync Analyzer |
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|Juniper MX10004|Keysight Time Sync Analyzer |
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|Juniper MX304|Keysight Time Sync Analyzer |
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|Juniper PTX10002-36QDD|Keysight Time Sync Analyzer |
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Table 56: Conformance Test Telecom Boundary Clock Class C/D - Class D Conformance Test - 100G Port Speed |
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{{/container}} |
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{{container cssClass="tc-role-table"}} |
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(% class="table-bordered" %) |
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|=T-BC-1|=T-GM-A |
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|Arrcus S9600-72XC|Calnex Paragon-neo PAM4 |
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|Ciena 5134|Keysight Time Sync Analyzer |
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|Ciena 5134|Calnex Paragon-neo PAM4 |
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|Ericsson Router6671|Calnex Paragon-neo PAM4 |
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|Ericsson Router6676|Keysight Time Sync Analyzer |
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|H3C S12500R-48Y8C|Keysight Time Sync Analyzer |
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|H3C S12500R-48Y8C|Calnex Paragon-neo PAM4 |
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|Huawei ATN 910D-A|Keysight Time Sync Analyzer |
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|Microchip TimeProvider® 4500|Calnex Paragon-neo PAM4 |
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Table 57: Conformance Test Telecom Boundary Clock Class C/D - Class D Conformance Test - 10G Port Speed |
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{{/container}} |
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{{container cssClass="tc-role-table"}} |
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(% class="table-bordered" %) |
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|=T-BC-1|=T-GM-A |
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|Ericsson Router6671|Calnex Paragon-neo PAM4 |
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|Ericsson Router6676|Keysight Time Sync Analyzer |
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|H3C S12500R-48Y8C|Keysight Time Sync Analyzer |
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Table 58: Conformance Test Telecom Boundary Clock Class C/D - Class D Conformance Test - 25G Port Speed |
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{{/container}} |
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{{container cssClass="tc-role-table"}} |
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(% class="table-bordered" %) |
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|=T-BC-1|=T-GM-A |
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|Arrcus S9600-72XC|Keysight Time Sync Analyzer |
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|Ciena 5134|Keysight Time Sync Analyzer |
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|Ericsson Router6676|Keysight Time Sync Analyzer |
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|H3C S12500R-48Y8C|Keysight Time Sync Analyzer |
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|Huawei ATN 910D-A|Keysight Time Sync Analyzer |
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Table 59: Conformance Test Telecom Boundary Clock Class C/D - Class C Conformance Test - 10G Port Speed |
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{{/container}} |
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{{container cssClass="tc-role-table"}} |
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(% class="table-bordered" %) |
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|=T-BC-1|=T-GM-A |
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|Arrcus S9600-72XC|Keysight Time Sync AnalyzerC |
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|Ciena 5134|Keysight Time Sync Analyzer |
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|Ciena 5134|Keysight Time Sync Analyzer |
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|H3C S12500R-48Y8C|Keysight Time Sync Analyzer |
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|Huawei ATN 910D-A|Keysight Time Sync Analyzer |
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Table 60: Conformance Test Telecom Boundary Clock Class C/D - Class C Conformance Test - 100G Port Speed |
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{{/container}} |
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{{container cssClass="tc-role-table"}} |
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(% class="table-bordered" %) |
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|=T-BC-1|=T-GM-A |
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|Ericsson Router6671|Keysight Time Sync Analyzer |
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|H3C S12500R-48Y8C|Keysight Time Sync Analyzer |
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|Microchip TimeProvider® 4500|Keysight Time Sync Analyzer |
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Table 61: Conformance Test Telecom Boundary Clock Class C/D - Class C Conformance Test - 25G Port Speed |
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|[[< Previous>>doc:Main.Multi-Vendor MPLS & SDN Interoperability Test Report 2025.Time Synchronization.WebHome]]|[[Next ~>>>doc:5G x-Haul design over SRv6 without link congestion]] |
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