160G×160G Fiberhome Fonsweaver 780B Cross Connect Card XCU S1 Information Processing

160G×160G Fiberhome Fonsweaver 780B Cross Connect Card XCU S1 Information Processing

The XCU card provides the clock signal for the equipment and implements higher / lower order cross-connect grooming.

The XCU card has two major functional modules: the clock module and the crossconnect module.

Clock Module Functions

• Processes the S1 information; receives the 8kHz line synchronization timing signal provided by each aggregate card and each tributary card.
• Provides the 38.88MHz synchronization clock, 8MHz overhead clock and 8kHz timing for each aggregate card and each tributary card.
• Provides the status indication signal of the XCU card for each card connected to the XCU card, so as to control the synchronization timing of each card.

Cross-connect module functions

• Provides the 1024×1024 VC-4 higher order cross-connect function.
• Provides the 8064×8064 VC-12 lower order cross-connect function.
• Processes tributary unit pointers for 128 VC-4s.
• Supports the lower order path protection ring for the E1 service with a bandwidth of no less than 40 VC-4s.
• Supports the sub-network connection protection (SNCP) function.
• Terminates the path overheads (B3) of 128 VC-4s .
• Processes the SALM bus output by each aggregate card and tributary card; implements the APS protocol conversion; and performs the MS SPRING function together with aggregate cards and tributary cards.
• Processes the PALM bus output by each aggregate card and tributary card; performs the UPSR function of the system.

The working principle of the XCU card is shown as below.

network interface card

internal network card

160G×160G Fiberhome Fonsweaver 780B Cross Connect Card XCU S1 Information Processing Images