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author	version	line-number	content
		1	(% class="row" %)
		2	(((
		3	(% class="col-xs-12 col-sm-8 test-report-content" %)
		4	(((
		5	----
		6
		7	Class C and D Telecom Boundary Clocks (T-BCs) are essential for meeting the tight time-synchronization requirements of today’s highly time-sensitive networks, such as 5G.
		8	ITU-T G.8273.2 defines several metrics and clear requirements for class C T-BC clocks. In contrast, for Class D, only one requirement is currently specified in ITU-T G.8273.2, section 7.1, table 7-2: a low-pass filtered maximum absolute time error (max\|TE,,L,,\| ≤ 5 ns).
		9	The performance of devices tested this year has improved once again compared to previous years.
		10	Every T-BC tested remained well within the Class D performance limit (max\|TE,,L,,\| ≤ 5 ns).
		11	This year, few Class C Conformance tests were conducted because almost every device was already compliant with Class D Conformance, leaving little incentive to test for Class C Conformance. However, all devices that executed the Class C Conformance test were also compliant.
		12
		13	[[~[~[Figure 89: Test setup for Class C/D Conformance Tests~>~>image:487250132039958529_conformance.png~\|~\|alt="Figure 89"~]~]>>attach:487250132039958529_conformance.png\|\|target="_blank"]]
		14
		15	Both test scenarios used an emulated Telecom Grandmaster (T-GM) and an emulated Telecom Time Synchronous Clock (T-TSC), both of which were either the Calnex Paragon neo, Calnex Paragon neo-A, Calnex Paragon neo-S, or the Keysight Time Sync Analyzer, with the T-BC under test positioned in between. These tests were conducted with either 10 or 100 Gigabit Ethernet (GbE) links, or, in two cases, even 800 GbE links.
		16	Although these were not interoperability tests, they were crucial because the clocks had to achieve either class C or class D qualification before being allowed to participate in further testing.
		17
		18	{{container cssClass="tc-role-table"}}
		19	(% class="table-bordered" %)
		20	\|=Emulated Telecom Grandmaster\|=Telecom Boundary Clock under Test\|=Emulated Telecom Time Synchronous Clock & Frequency/Phase Analyzer
		21	\|Calnex Paragon neo-A\|ZTE ZXR10 M6000-2S16\|Calnex Paragon neo-A
		22	\|Calnex Paragon neo-A\|ZTE ZXCTN 6120H-S\|Calnex Paragon neo-A
		23	\|Keysight Time Sync Analyzer\|ZTE ZXCTN 6120H-E\|Keysight Time Sync Analyzer
		24	\|Calnex Paragon neo-A\|ZTE ZXR10 M6000-4SE\|Calnex Paragon neo-A
		25	\|Keysight Time Sync Analyzer\|HPE ACX 7020\|Keysight Time Sync Analyzer
		26	\|Keysight Time Sync Analyzer\|HPE ACX 7024\|Keysight Time Sync Analyzer
		27	\|Calnex Paragon neo\|HPE ACX 7332\|Calnex Paragon neo
		28	\|Calnex Paragon neo\|HPE MX 304\|Calnex Paragon neo
		29	\|Keysight Time Sync Analyzer\|Ericsson Router 6671\|Keysight Time Sync Analyzer
		30	\|Calnex Paragon neo\|Ericsson Router 6676\|Calnex Paragon neo
		31	\|Calnex Paragon neo\|Ericsson RAN Connect 6682\|Calnex Paragon neo
		32	\|Keysight Time Sync Analyzer\|Ciena 5164\|Keysight Time Sync Analyzer
		33	\|Keysight Time Sync Analyzer\|Microchip Time Provider 4500\|Keysight Time Sync Analyzer
		34	\|Calnex Paragon neo-A\|Cisco 8011-4G24Y4H-I\|Calnex Paragon neo-A
		35	\|Calnex Paragon neo\|Raisecom iTN8800-A\|Calnex Paragon neo
		36	\|Keysight Time Sync Analyzer\|ZTE ZXR10 M6000-3S Plus\|Keysight Time Sync Analyzer
		37	\|Keysight Time Sync Analyzer\|HPE PTX10002-60MR\|Keysight Time Sync Analyzer
		38	\|Keysight Time Sync Analyzer\|HPE PTX10002-36QDD\|Keysight Time Sync Analyzer
		39
		40	{{/container}}
		41
		42	Table 62: ITU-T G.8273.2 - Telecom Boundary Clock Class D Conformance - 10 GbE
		43
		44	{{container cssClass="tc-role-table"}}
		45	(% class="table-bordered" %)
		46	\|=Emulated Telecom Grandmaster\|=Telecom Boundary Clock under Test\|=Emulated Telecom Time Synchronous Clock & Frequency/Phase Analyzer
		47	\|Calnex Paragon neo-A\|HPE PTX10002-60MR\|Calnex Paragon neo-A
		48	\|Calnex Paragon neo-A\|HPE ACX 7100-32C\|Calnex Paragon neo-A
		49	\|Calnex Paragon neo-A\|HPE PTX10002-36QDD\|Calnex Paragon neo-A
		50	\|Calnex Paragon neo\|Cisco 8711-32FH-M\|Calnex Paragon neo
		51	\|Keysight Time Sync Analyzer\|Cisco 8011-4G24Y4H-I\|Keysight Time Sync Analyzer
		52	\|Keysight Time Sync Analyzer\|Ciena 5164\|Keysight Time Sync Analyzer
		53	\|Keysight Time Sync Analyzer\|Ericsson RAN Connect 6682\|Keysight Time Sync Analyzer
		54	\|Calnex Paragon neo-A\|HPE ACX 7332\|Calnex Paragon neo-A
		55	\|Calnex Paragon neo-A\|HPE MX 304\|Calnex Paragon neo-A
		56	\|Calnex Paragon neo-A\|HPE ACX 7024\|Calnex Paragon neo-A
		57	\|Calnex Paragon neo-A\|HPE MX 301\|Calnex Paragon neo-A
		58	\|Keysight Time Sync Analyzer\|Cisco Nexus C93400LD-H1\|Keysight Time Sync Analyzer
		59
		60	{{/container}}
		61
		62	Table 63: ITU-T G.8273.2 - Telecom Boundary Clock Class D Conformance - 100 GbE
		63
		64	{{container cssClass="tc-role-table"}}
		65	(% class="table-bordered" %)
		66	\|=Emulated Telecom Grandmaster\|=Telecom Boundary Clock under Test\|=Emulated Telecom Time Synchronous Clock & Frequency/Phase Analyzer
		67	\|Calnex Paragon neo-S\|Ciena 8192\|Calnex Paragon neo-S
		68	\|Calnex Paragon neo-S\|HPE PTX10002-60MR\|Calnex Paragon neo-S
		69
		70	{{/container}}
		71
		72	Table 64: ITU-T G.8273.2 - Telecom Boundary Clock Class D Conformance - 800 GbE
		73
		74	{{container cssClass="tc-role-table"}}
		75	(% class="table-bordered" %)
		76	\|=Emulated Telecom Grandmaster\|=Telecom Boundary Clock under Test\|=Emulated Telecom Time Synchronous Clock & Frequency/Phase Analyzer
		77	\|Keysight Time Sync Analyzer\|Raisecom iTN8800-A\|Keysight Time Sync Analyzer
		78	\|Keysight Time Sync Analyzer\|Microchip Time Provider 4500\|Keysight Time Sync Analyzer
		79	\|Keysight Time Sync Analyzer\|ZTE ZXCTN 6120H-S\|Keysight Time Sync Analyzer
		80	\|Keysight Time Sync Analyzer\|ZTE ZXCTN 6120H-E\|Keysight Time Sync Analyzer
		81	\|Keysight Time Sync Analyzer\|ZTE ZXR10 M6000-4SE\|Keysight Time Sync Analyzer
		82	\|Keysight Time Sync Analyzer\|ZTE ZXR10 M6000-3S Plus\|Keysight Time Sync Analyzer
		83
		84	{{/container}}
		85
		86	Table 65: ITU-T G.8273.2 - Telecom Boundary Clock Class C Conformance - 10 GbE
		87
		88	{{container cssClass="tc-role-table"}}
		89	(% class="table-bordered" %)
		90	\|=Emulated Telecom Grandmaster\|=Telecom Boundary Clock under Test\|=Emulated Telecom Time Synchronous Clock & Frequency/Phase Analyzer
		91	\|Keysight Time Sync Analyzer\|Ciena 5164\|Keysight Time Sync Analyzer
		92	\|Keysight Time Sync Analyzer\|Cisco Nexus 93180YC-FX3\|Keysight Time Sync Analyzer
		93
		94	{{/container}}
		95
		96	Table 66: ITU-T G.8273.2 - Telecom Boundary Clock Class C Conformance - 100 GbE
		97
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