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In production networks, there are sometimes special scenarios, such as in Brownfield networks, where using Full Timing Support (FTS; ITU-T G.8271.1/G.8275.1) throughout the entire network is not an option, and using Partial Timing Support (PTS; ITU-T G.8271.1/G.8275.2) for the entire network is also not desirable. |
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In these scenarios, both PTP profiles must coexist on the same network. |
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This requires a Telecom Boundary Clock (T-BC) that can translate between the two profiles while meeting the specifications of each, a feature called a Profile Interworking Function (IWF). |
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These tests aim to validate T-BC-1's ability to translate between FTS and PTS and vice versa. |
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[[~[~[Figure 92: Interworking Function - General Topology for FTS to PTS & PTS to FTS~>~>image:487251630681554945_IWF.png~|~|alt="Figure 92"~]~]>>attach:487251630681554945_IWF.png||target="_blank"]] |
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For all of these different combinations and iterations, except for one, the Microchip TimeProvider® 4500 was utilized as the Telecom Grandmaster (T-GM), sending either FTS or PTS downstream towards the first Telecom Boundary Clock (T-BC-1); T-BC-1 served as the IWF gateway for the translation of each respective PTP profile, where it would then be converted and sent downstream towards T-BC-2. T-BC-2's output was then measured by either the Calnex Paragon neo, Paragon neo-A, or the Keysight Time Sync Analyzer. |
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For the ITU-T G.8275.1 to ITU-T G.8275.2 (FTS to PTS), the T-GM provided ITU-T G.8275.1 traffic towards T-BC-1. T-BC-1 then translated FTS to PTS and sent it downstream to T-BC-2, where its output was measured. |
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For the ITU-T G.8275.2 to ITU-T G.8275.1 (PTS to FTS), the process was the opposite: the T-GM transmitted PTS traffic to T-BC-1, which translated it to FTS and sent it to T-BC-2, where the output was again measured. |
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For the limit metrics of these two test cases, we have chosen the constant Time Error (cTE) and the peak-to-peak two-way low-pass-filtered dynamic Time Error (dTE,,L,,) of 200ns. |
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For FTS T-BCs, the cTE for class C is defined as +/- 10ns, as per ITU-T G.8273.2; for PTS T-BCs, only classes A and B are defined for the cTE, +/- 50ns for class A and +/- 20ns for class B, as per ITU-T G.8273.4; this gives us limits of +/- 60ns for one class C FTS T-BC and one class A PTS T-BC and the tighter limit of +/- 30ns for one class C FTS T-BC and one class A PTS T-BC. |
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For FTS to PTS, the cTE of 14 out of the 17 different combinations was within the limit of +/- 30ns, with some being less than +/- 20ns and some even less than +/-10 ns; the other three iterations were within the limits of +/- 60ns. All combinations were well within the 200ns peak-to-peak limit for the dTE,,L,,. |
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For PTS to FTS, the cTE of three out of 12 different combinations was within the limit of +/- 30ns, with one combination being sub +/- 20ns and two being sub +/- 10ns; the remaining nine combinations were all well within the limit of +/- 60ns. For the peak-to-peak dTE,,L,,, all combinations were, once again, more than well within the limits of 200ns. |
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{{container cssClass="tc-role-table"}} |
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(% class="table-bordered" %) |
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|=Grandmaster|=BC-1|=BC-2|=Frequency/Phase Analyzer |
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|Keysight TSA|Cisco 8011-4G24Y4H-I|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|Ericsson RAN Connect 6682|Raisecom iTN8800-A|Calnex Paragon neo |
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|Microchip Time Provider 4500|Raisecom iTN8800-A|Ericsson Router 6671|Calnex Paragon neo |
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|Microchip Time Provider 4500|Ciena 5164|Cisco 8011-4G24Y4H-I|Keysight TSA |
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|Microchip Time Provider 4500|Cisco 8011-4G24Y4H-I|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|Ciena 5164|Ericsson Router 6676|Calnex Paragon neo-A |
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|Microchip Time Provider 4500|Ericsson Router 6671|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|Ericsson Router 6676|Cisco 8011-4G24Y4H-I|Keysight TSA |
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|Microchip Time Provider 4500|Cisco 8011-4G24Y4H-I|Ericsson Router 6676|Calnex Paragon neo |
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|Microchip Time Provider 4500|ZTE ZXCTN 6120H-S|HPE ACX7024|Calnex Paragon neo-A |
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|Microchip Time Provider 4500|ZTE ZXR10 M6000-4SE|Ericsson RAN Connect 6682|Calnex Paragon neo |
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|Microchip Time Provider 4500|Ericsson RAN Connect 6682|ZTE ZXR10 M6000-4SE|Keysight TSA |
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|Microchip Time Provider 4500|Ciena 5164|ZXCTN 6120H-E|Keysight TSA |
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|Microchip Time Provider 4500|Ciena 5164|Raisecom iTN8800-A|Calnex Paragon neo |
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|Microchip Time Provider 4500|ZXCTN 6120H-E|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|Microchip Time Provider 4500|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|Cisco 8011-4G24Y4H-I|Microchip Time Provider 4500|Calnex Paragon neo-A |
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Table 70: Telecom Boundary Clock - Profile Interworking Function - G.8275.1 - to - G.8275.2 T-BC performance |
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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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|=Grandmaster|=BC-1|=BC-2|=Frequency/Phase Analyzer |
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|Microchip Time Provider 4500|Ciena 5164|Cisco 8011-4G24Y4H-I|Calnex Paragon neo-A |
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|Microchip Time Provider 4500|Cisco 8011-4G24Y4H-I|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|ZTE ZXCTN 6120H-S|Ericsson RAN Connect 6682|Calnex Paragon neo |
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|Microchip Time Provider 4500|Ericsson RAN Connect 6682|ZTE ZXCTN 6120H-S|Keysight TSA |
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|Microchip Time Provider 4500|Raisecom iTN8800-A|ZTE ZXR10 M6000-2S16|Calnex Paragon neo |
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|Microchip Time Provider 4500|Microchip Time Provider 4500|ZTE ZXR10 M6000-4SE|Calnex Paragon neo |
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|Microchip Time Provider 4500|ZTE ZXR10 M6000-4SE|Microchip Time Provider 4500|Calnex Paragon neo-A |
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|Microchip Time Provider 4500|Ciena 5164|HPE MX304|Calnex Paragon neo |
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|Microchip Time Provider 4500|ZXCTN 6120H-E|Ciena 5164|Keysight TSA |
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|Microchip Time Provider 4500|Ciena 5164|Ericsson Router 6676|Calnex Paragon neo-A |
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|Microchip Time Provider 4500|Cisco 8011-4G24Y4H-I|HPE MX304|Calnex Paragon neo |
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|Microchip Time Provider 4500|Ciena 5164|ZXCTN 6120H-E|Calnex Paragon neo |
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Table 71: Telecom Boundary Clock - Profile Interworking Function - G.8275.2 - to - G.8275.1 T-BC performance |
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{{/container}} |
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|[[< Previous>>doc:PTP over DWDM transport]]|[[Next ~>>>doc:Passive Port Monitoring]] |
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