【OMCI实践】ONT上线过程的omci消息（四）

引言

在前三篇文章中，主要介绍了ONT上线过程的OMCI交互的第一个阶段和第二个阶段omci消息，本篇介绍第三个阶段，ONT上报受管实体类型表的过程。

OMCI受管实体分类

OMCI受管实体编号为两个字节，最大支持定义65535个受管实体类型，根据标准定义情况可以划分以下三类

已定义的标准受管实体：编号范围是1~171，256~349，400~466，在ITU G.984.4和G.988中定义，在最新的2022年的G.988，已经定义到编号466（Precision Time Protocol status），参考附录；
预留的标准受管实体：编号范围172~239，467~65279，ITU预留的未定义的；
厂商自行定义的私有受管实体：编号范围是240-255，350~399，65280-65535，主要是各OLT局端厂商定义的私有受管实体，用于实现厂商私有的协议和功能等。

疑问

OMCI标准定义的受管实体一直在增加，OLT局端如何知道ONT支持哪些标准受管实体？
OLT局端需要对接不同厂商的ONT，如何知道ONT支持哪些私有的受管实体？

答案是，在ONT上线过程中，ONT通过OMC类的实例向OLT上报自身支持的所有受管实体列表，包括标准的受管实体和私有的受管实体。

ONT上报受管实体类型表的过程

1、OLT下发OMCI实例的GET操作

OMCI（Get， 0x0000）

Message Type = Get

Managed Entity Class: OMCI (011f)

该受管实体描述了ONT支持OMCI受管实体和消息的能力程度。该受管实体不包括在MIB upload过程中。

Managed Entity Instance: 0x0000

受管实体ID：该属性为OMCI受管实体的每个实例提供一个唯一编码。该实例仅有一个并且编码为0。

Attribute List

01: ME Type Table (0000)，

受管实体类型表：该属性列出了ONT支持的受管实体类型。每个表项包含一个受管实体的类型值，长度是N×2字节，N是表项数目

2、ONT回复受管实体类型表长度，0x00cc表示204个字节，即102个受管实体类型需要上报；

由于OMCI消息长度限制，每次只能上报29个字节，即14.5个受管实体编号。204字节除29字节等于7.03，表示要分成8个片段上传

3、OLT下发OMCI GET Next操作，要求ONT上传第0个片段（即前14.5个受管实体编号）

4、ONT恢复消息，上报第0个片段（前14.5个受管实体编号）

上图中，在0x8000后的红色框住的15个字节是7个受管实体编号，以及第8个受管实体编号的高字节，依次是0002 0005 0006 0007 000b 0018 002d 002e 002f 0030 0031 0032 0033 0034 00

前三个受管实体类型，查看OMCI标准文档可以得知，正是在第一个和第二阶段上报过的受管实体：

0x0002：ONU data

0x0005：Cardholder

0x0006：Circuit pack

5、重复步骤3和4，ONT共上报102个受管实体编号；最后一个是0x0166，即编号460，说明ONT只支持标准定义的受管实体

小结

抓取解析受管实体类型表有两个好处：

可以快速了解自身产品支持受管实体类型是否满足客户需求
可以快速了解竞品支持受管实体类型，对比分析出自身产品不支持受管实体类型，进而排查问题和针对性开发

附录：OMCI受管实体列表

2022年版G.988的受管实体标识符列表.xlsx

链接: 百度网盘请输入提取码提取码: uxv1

受管实体标识符列表
受管实体类型值	受管实体名
1	ONTB-PON
2	ONU data
3	PON IF line cardholder
4	PON IF line card
5	Cardholder
6	Circuit pack
7	Software image
8	UNIB-PON
9	TC AdapterB-PON
10	Physical path termination point ATM UNI
11	Physical path termination point Ethernet UNI
12	Physical path termination point CES UNI
13	Logical N X 64 kbit/s sub-port connection termination point
14	Interworking VCC termination point
15	AAL1 profileB-PON
16	AAL5 profile
17	AAL1 protocol monitoring history dataB-PON
18	AAL5 performance monitoring history data
19	AAL2 profile
20	(Intentionally left blank)
21	CES service profile
22	(Reserved)
23	CES physical interface performance monitoring history data
24	Ethernet performance monitoring history data
25	VP network CTPBPON
26	ATM VP cross-connection
27	Priority queueB-PON
28	DBR/CBR traffic descriptor
29	UBR traffic descriptor
30	SBR1/VBR1 traffic descriptor
31	SBR2/VBR2 traffic descriptor
32	SBR3/VBR3 traffic descriptor
33	ABR traffic descriptor
34	GFR traffic descriptor
35	ABT/DT/IT traffic descriptor
36	UPC disagreement monitoring history dataB-PON
37	(Intentionally left blank)
38	ANI (B-PON)
39	PON TC adapter
40	PON physical path termination point
41	TC adapter protocol monitoring history data
42	Threshold dataB-PON
43	Operator specific
44	Vendor specific
45	MAC bridge service profile
46	MAC bridge configuration data
47	MAC bridge port configuration data
48	MAC bridge port designation data
49	MAC bridge port filter table data
50	MAC bridge port bridge table data
51	MAC bridge performance monitoring history data
52	MAC bridge port performance monitoring history data
53	Physical path termination point POTS UNI
54	Voice CTP
55	Voice PM history data
56	AAL2 PVC profileB-PON
57	AAL2 CPS protocol monitoring history dataB-PON
58	Voice service profile
59	LES service profile
60	AAL2 SSCS parameter profile1
61	AAL2 SSCS parameter profile2
62	VP performance monitoring history data
63	Traffic schedulerB-PON
64	T-CONT buffer
65	UBR+ traffic descriptor
66	AAL2 SSCS protocol monitoring history dataB-PON
67	IP port configuration data
68	IP router service profile
69	IP router configuration data
70	IP router performance monitoring history data 1
71	IP router performance monitoring history data 2
72	ICMP performance monitoring history data 1
73	ICMP performance monitoring history data 2
74	IP route table
75	IP static routes
76	ARP service profile
77	ARP configuration data
78	VLAN tagging operation configuration data
79	MAC bridge port filter pre-assign table
80	Physical path termination point ISDN UNI
81	(Reserved)
82	Physical path termination point video UNI
83	Physical path termination point LCT UNI
84	VLAN tagging filter data
85	ONUB-PON
86	ATM VC cross-connection
87	VC network CTPB-PON
88	VC PM history data
89	Ethernet performance monitoring history data 2
90	Physical path termination point video ANI
91	Physical path termination point IEEE 802.11 UNI
92	IEEE 802.11 station management data 1
93	IEEE 802.11 station management data 2
94	IEEE 802.11 general purpose object
95	IEEE 802.11 MAC and PHY operation and antenna data
96	IEEE 802.11 performance monitoring history data
97	IEEE 802.11 PHY FHSS DSSS IR tables
98	Physical path termination point xDSL UNI part 1
99	Physical path termination point xDSL UNI part 2
100	xDSL line inventory and status data part 1
101	xDSL line inventory and status data part 2
102	xDSL channel downstream status data
103	xDSL channel upstream status data
104	xDSL line configuration profile part 1
105	xDSL line configuration profile part 2
106	xDSL line configuration profile part 3
107	xDSL channel configuration profile
108	xDSL subcarrier masking downstream profile
109	xDSL subcarrier masking upstream profile
110	xDSL PSD mask profile
111	xDSL downstream RFI bands profile
112	xDSL xTU-C performance monitoring history data part 1
113	xDSL xTU-R performance monitoring history data
114	xDSL xTU-C channel performance monitoring history data
115	xDSL xTU-R channel performance monitoring history data
116	TC adaptor performance monitoring history data xDSL
117	Physical path termination point VDSL UNI (ITU-T G.993.1 VDSL1)
118	VDSL VTU-O physical data
119	VDSL VTU-R physical data
120	VDSL channel data
121	VDSL line configuration profile
122	VDSL channel configuration profile
123	VDSL band plan configuration profile
124	VDSL VTU-O physical interface monitoring history data
125	VDSL VTU-R physical interface monitoring history data
126	VDSL VTU-O channel performance monitoring history data
127	VDSL VTU-R channel performance monitoring history data
128	Video return path service profile
129	Video return path performance monitoring history data
130	IEEE 802.1p mapper service profile
131	OLT-G
132	Multicast interworking VCC termination point
133	ONU power shedding
134	IP host config data
135	IP host performance monitoring history data
136	TCP/UDP config data
137	Network address
138	VoIP config data
139	VoIP voice CTP
140	Call control performance monitoring history data
141	VoIP line status
142	VoIP media profile
143	RTP profile data
144	RTP performance monitoring history data
145	Network dial plan table
146	VoIP application service profile
147	VoIP feature access codes
148	Authentication security method
149	SIP config portal
150	SIP agent config data
151	SIP agent performance monitoring history data
152	SIP call initiation performance monitoring history data
153	SIP user data
154	MGC config portal
155	MGC config data
156	MGC performance monitoring history data
157	Large string
158	ONU remote debug
159	Equipment protection profile
160	Equipment extension package
161	Port-mapping packageBPON(B-PON only; use 297 for G-PON)
162	Physical path termination point MoCA UNI
163	MoCA Ethernet performance monitoring history data
164	MoCA interface performance monitoring history data
165	VDSL2 line configuration extensions
166	xDSL line inventory and status data part 3
167	xDSL line inventory and status data part 4
168	VDSL2 line inventory and status data part 1
169	VDSL2 line inventory and status data part 2
170	VDSL2 line inventory and status data part 3
171	Extended VLAN tagging operation configuration data
172..239	Reserved for future B-PON managed entities
240-255	Reserved for vendor-specific managed entities
256	ONU-G (NOTE – In [ITU-T G.984.4] this was called ONT-G)
257	ONU2-G (NOTE – In [ITU-T G.984.4] this was called ONT2-G)
258	ONU-G (deprecated – note that the name is re-used for code point 256)
259	ONU2-G (deprecated – note that the name is re-used for code point 257)
260	PON IF line card-G
261	PON TC adapter-G
262	T-CONT
263	ANI-G
264	UNI-G
265	ATM interworking VCC termination point
266	GEM interworking termination point
267	GEM port performance monitoring history data (obsolete)
268	GEM port network CTP
269	VP network CTP
270	VC network CTP-G
271	GAL TDM profile (deprecated)
272	GAL Ethernet profile
273	Threshold data 1
274	Threshold data 2
275	GAL TDM performance monitoring history data (deprecated)
276	GAL Ethernet performance monitoring history data
277	Priority queue
278	Traffic scheduler
279	Protection data
280	Traffic descriptor
281	Multicast GEM interworking termination point
282	Pseudowire termination point
283	RTP pseudowire parameters
284	Pseudowire maintenance profile
285	Pseudowire performance monitoring history data
286	Ethernet flow termination point
287	OMCI
288	Managed entity
289	Attribute
290	Dot1X port extension package
291	Dot1X configuration profile
292	Dot1X performance monitoring history data
293	Radius performance monitoring history data
294	TU CTP
295	TU performance monitoring history data
296	Ethernet performance monitoring history data 3
297	Port-mapping package
298	Dot1 rate limiter
299	Dot1ag maintenance domain
300	Dot1ag maintenance association
301	Dot1ag default MD level
302	Dot1ag MEP
303	Dot1ag MEP status
304	Dot1ag MEP CCM database
305	Dot1ag CFM stack
306	Dot1ag chassis-management info
307	Octet string
308	General purpose buffer
309	Multicast operations profile
310	Multicast subscriber config info
311	Multicast subscriber monitor
312	FEC performance monitoring history data
313	RE ANI-G
314	Physical path termination point RE UNI
315	RE upstream amplifier
316	RE downstream amplifier
317	RE config portal
318	File transfer controller
319	CES physical interface performance monitoring history data 2
320	CES physical interface performance monitoring history data 3
321	Ethernet frame performance monitoring history data downstream
322	Ethernet frame performance monitoring history data upstream
323	VDSL2 line configuration extensions 2
324	xDSL impulse noise monitor performance monitoring history data
325	xDSL line inventory and status data part 5
326	xDSL line inventory and status data part 6
327	xDSL line inventory and status data part 7
328	RE common amplifier parameters
329	Virtual Ethernet interface point
330	Generic status portal
331	ONU-E
332	Enhanced security control
333	MPLS pseudowire termination point
334	Ethernet frame extended PM
335	SNMP configuration data
336	ONU dynamic power management control
337	PW ATM configuration data
338	PW ATM performance monitoring history data
339	PW Ethernet configuration data
340	BBF TR-069 management server
341	GEM port network CTP performance monitoring history data
342	TCP/UDP performance monitoring history data
343	Energy consumption performance monitoring history data
344	XG-PON TC performance monitoring history data
345	XG-PON downstream management performance monitoring history data
346	XG-PON upstream management performance monitoring history data
347	IPv6 host config data
348	MAC bridge port ICMPv6 process pre-assign table
349	PoE control
350-399	Reserved for vendor-specific use
400	Ethernet pseudowire parameters
401	Physical path termination point RS232/RS485 UNI
402	RS232/RS485 port operation configuration data
403	RS232/RS485 performance monitoring history data
404	L2 multicast GEM interworking termination point
405	ANI-E
406	EPON downstream performance monitoring configuration
407	SIP agent config data 2
408	xDSL xTU-C performance monitoring history data part 2
409	PTM performance monitoring history data xDSL
410	VDSL2 line configuration extensions 3
411	Vectoring line configuration extensions
412	xDSL channel configuration profile part 2
413	xTU data gathering configuration
414	xDSL line inventory and status data part 8
415	VDSL2 line inventory and status data part 4
416	Vectoring line inventory and status data
417	Data gathering line test, diagnostic and status
418	EFM bonding group
419	EFM bonding link
420	EFM bonding group performance monitoring history data
421	EFM bonding group performance monitoring history data part 2
422	EFM bonding link performance monitoring history data
423	EFM bonding port performance monitoring history data
424	EFM bonding port performance monitoring history data part 2
425	Ethernet frame extended PM 64 bit
426	Threshold data 64 bit
427	Physical path termination point UNI part 3 (FAST)
428	FAST line configuration profile part 1
429	FAST line configuration profile part 2
430	FAST line configuration profile part 3
431	FAST line configuration profile part 4
432	FAST channel configuration profile, part 1
433	FAST data path configuration profile
434	FAST vectoring line configuration extensions
435	FAST line inventory and status data
436	FAST line inventory and status data part 2
437	FAST xTU-C performance monitoring history data
438	FAST xTU-R performance monitoring history data
439	OpenFlow config data
440	Time Status Message
441	ONU3-G
442	TWDM System Profile managed entity
443	TWDM channel managed entity
444	TWDM channel PHY/LODS performance monitoring history data
445	TWDM channel XGEM performance monitoring history data
446	TWDM channel PLOAM performance monitoring history data part 1
447	TWDM channel PLOAM performance monitoring history data part 2
448	TWDM channel PLOAM performance monitoring history data part 3
449	TWDM channel tuning performance monitoring history data part 1
450	TWDM channel tuning performance monitoring history data part 2
451	TWDM channel tuning performance monitoring history data part 3
452	TWDM channel OMCI performance monitoring history data
453	Enhanced FEC performance monitoring history data
454	Enhanced TC performance monitoring history data
455	Link aggregation service profile
456	ONU manufacturing data
457	ONU time configuration
458	IP host performance monitoring history data part 2
459	ONU operational performance monitoring history data
460	ONU4-G
461	BBF TR-369 USP agent
462	FAST channel configuration profile, part 2
463	FAST line failures performance monitoring data
464	Synchronous Ethernet operation
465	Precision Time Protocol
466	Precision Time Protocol status
467-65279	Reserved for future standardization
65280-65535	Reserved for vendor-specific use