Huawei OptiX OSN 8800 T64 Cross-Connect Function

The OptiX OSN 8800 supports 40 Gbit/s and 100 Gbit/s line rates and a 6.4 Tbit/s cross-connect capacity. It features power saving, and high reliability and maintainability. In this article, HongTelecom will introduce Huawei OptiX OSN 8800 T64 cross-connection function.

Highest Cross-Connect Capacity with Flexible Large-Capacity Service Grooming

• Features high cross-connect capacity. A single subrack supports a maximum of 6.4 Tbit/s cross-connect capacity, implementing large-capacity service grooming. Only one subrack is required for the large-capacity service grooming and therefore lowers power consumption and reduces the floor space.
• Supports multi-granularity OTN cross-connection, that is, ODUk cross-connection, where k can be 0, 1, 2, 2e, 3, 4, or flex.
• Supports encapsulation of VC, ODUk, and packet services by using universal line boards and unified switching of VC, ODUk, and packet services by using cross-connect boards, which achieves converged service grooming planes and flexible bandwidth allocation.

Cross-Connect Capacities

The cross-connect capacity of a slot in an OptiX OSN 8800 T64 subrack vary according to the type of cross-connect board installed in the slot.

OptiX OSN 8800 T64 subracks can cross-connect ODU0, ODU1, ODU2, ODU2e, ODU3, ODU4, ODUflex, VC-4, VC-3, and VC-12 granularities at the same time. Slots IU1-IU8, IU11-IU42, and IU45-IU68 provide the same cross-connect capacity. As shown in Table 1.

Table 1 Cross-connect capacity of OptiX OSN 8800 T64 subrack

Subrack Type	Cross-Connect Board	Maximum Cross-Connect Capacity of Each Slota			Maximum Cross-Connect Capacity of Subrack
		ODUkb	VC-4	VC-3/VC-12e	ODUkb	VC-4	VC-3/VC-12
Enhanced	USXH	N/A	20 Gbit/s	N/A	N/A	1.28 Tbit/s	N/A
Enhanced	USXH+UXCTc	100 Gbit/s	20 Gbit/s	N/A	6.4 Tbit/s	1.28 Tbit/s	N/A
Enhanced	SXH	N/A	20 Gbit/s	N/A	N/A	1.28 Tbit/s	N/A
Enhanced	SXM	N/A	20 Gbit/s	20 Gbit/s	N/A	1.28 Tbit/s	80 Gbit/s
Enhanced	SXH+XCTc	40 Gbit/s	20 Gbit/s	N/A	2.56 Tbit/s	1.28 Tbit/s	N/A
Enhanced	SXM+XCTc	40 Gbit/s	20 Gbit/s	20 Gbit/s	2.56 Tbit/s	1.28 Tbit/s	80 Gbit/s
General	SXH	N/A	20 Gbit/s	N/A	N/A	1.28 Tbit/s	N/A
General	SXM	N/A	20 Gbit/s	20 Gbit/s	N/A	1.28 Tbit/s	80 Gbit/s
General	SXH+XCTd	40 Gbit/s	20 Gbit/s	N/A	2.56 Tbit/s	1.28 Tbit/s	N/A
General	SXM+XCTd	40 Gbit/s	20 Gbit/s	20 Gbit/s	2.56 Tbit/s	1.28 Tbit/s	80 Gbit/s
a: In OptiX OSN 8800 T64 enhanced subrack, the maximum OTN service cross-connect capacity of a single slot can be smoothly increased from 40 Gbit/s to 100 Gbit/s by replacing the cross-connect board. b: k=0, 1, 2, 2e, 3, 4 or flex. Only the USXH+UXCT supports ODU4 granularities. c: Enhanced OptiX OSN 8800 T64 subracks must be configured with both the USXH and UXCT boards, the SXH and XCT boards or the SXM and XCT boards to cross-connect ODUk granularities. d: General OptiX OSN 8800 T64 subracks must be configured with both the SXH and XCT boards or the SXM and XCT boards to cross-connect ODUk granularities. e: All service slots share a bandwidth of 80 Gbit/s. Two functional versions are available for SXH, SXM, and XCT boards: TNK2 and TNK4. The boards can be used in OptiX OSN 8800 T64 enhanced subrack only when they are of the TNK4 version.

Cross-Connect Board Redundancy

Two cross-connect boards can be configured for 1+1 backup.

Table 1 Relationship between cross-connect boards and equipment

Product	Cross-connect Board Supported
Enhanced OptiX OSN 8800 T64	SXM+XCT, SXH+XCT, or USXH+UXCT
General OptiX OSN 8800 T64	SXM+XCT or SXH+XCT
Enhanced OptiX OSN 8800 T32	XCM, XCH, UXCM, or UXCH
General OptiX OSN 8800 T32	XCH or XCM
OptiX OSN 8800 T16	XCH or UXCMa

The active and standby cross-connect boards in a subrack connect to all other boards through the backplane bus to protect cross-connection services. For details, see Figure 1, Figure 2, and Figure 3 .

When the standby cross-connect board detects that the active cross-connect board is faulty or receives a switching command from the NMS, it immediately takes over the active cross-connect board, sets itself as the active cross-connect board, and reports a switching event. Services on the subrack are not affected during the switching.

NOTE:

Active/Standby switching of cross-connect boards usually has no impact on services. For the TN54EX2, TN54EG16, and TN54PND2 boards, however, active/standby switching on the boards will cause transient interruption of services on the board.

There are two types of switching for the 1+1 protection switching of cross-connect boards:

• Automatic switching
  The cross-connect board detects its own status through hardware or software. If it is in the abnormal status, a switching is performed automatically. The switching is performed by the board and no manual operation is required.
  
  Switching trigger conditions are as follows:

  • A hardware fault occurs on the cross-connect board.
  • The cross-connect board goes offline when, for example, it is removed or undergoes a cold reset.
  • A fault occurs on bus between a service board and the cross-connect board.
  • Switching occurs between the active and standby STG boards in an OptiX OSN 8800 T64/T32 subrack.
• Manual switching
  When a switching is required in a test during the normal running of the active and the standby SCCs, the switching can be performed manually.

Figure 1 Cross-connect boards in mutual backup for OptiX OSN 8800 T64    

NOTE:

The letter k in "ODUk" is 0, 1, 2, 3,4, or flex.

The letter n in "VC-n" is 12, 3, or 4.

The SXM board supports VC-4/VC-3/VC-12 signals. The SXH/USXH board supports VC-4 signals.

Figure 2 Cross-connect boards in mutual backup for OptiX OSN 8800 T32  

NOTE:

The letter k in "ODUk" is 0, 1, 2, 3,4, or flex.
The letter n in "VC-n" is 12, 3, or 4.
Only UXCH/UXCM board supports packet services.
The XCM/UXCM board supports VC-4/VC-3/VC-12 signals. The XCH/UXCH board supports VC-4 signals.

Figure 3 Cross-connect boards in mutual backup for OptiX OSN 8800 T16 

NOTE:

The letter k in "ODUk" is 0, 1, 2, 3, flex, or 4.

The letter n in "VC-n" is 12, 3, or 4.

Only UXCM board supports packet services.

Only UXCM board supports VC-4/VC-3/VC-12 signals.

Related main control board list

TN16XCH	High Cross-connection, System Control and Clock Processing Board
TNK2SXM	OptiX OSN 8800 T64 centralized cross connect board
TNK4SXM
TN52UXCH	3.2T Universal Cross Connect Board
TN52XCH	OptiX OSN 8800 T32 centralized cross connect board
TN52UXCM	3.2T Universal Cross Connect Board
TN52XCM	Cross & connect process board (Support high- cross and low-cross)
TNK2UXCT	6.4T Universal Cross Connect Board
TNK2XCT	OptiX OSN 8800 T64 centralized cross connect board
TNK4XCT
TN16UXCM	1.6T Universal Cross Connect, System Control and Clock Processing Board
TNK2USXH	6.4T Universal Cross Connect Board
TNK2SXH	OptiX OSN 8800 T64 centralized cross connect board
TNK4SXH

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