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NE80 POS Interface and the Device of C Company cannot Connect because CRC Check Character is False

Publication Date:  2012-07-27 Views:  49 Downloads:  0
Issue Description
NE80 connects with the device of C company through POS interface. When the closest port is loopback, the physical and protocol state are down, but interface light on the board flashes. Change local clock as master and it is normal.
Topology: NE80 155M POS interface---------optical transmission--------C company 155M POS
Alarm Information
Null
Handling Process
1. Change the clock as master, and then the loopback of nearest port succeeds.
2. During the connection with C company, the protocol is down. CRC check character of opposite POS interface is 16-bit and that of NE80 is 32-bit. Change opposite one as 32-bit, the  protocol is up. The link is normal.
Root Cause
1. For the loopback of common ppp protocol link, set the clock as master. 
2. Connect with POS of C company, CRC check character of C company is 16-bit, ours is 32-bit and it cannot be configured.
Tx Clock Source: Internal, FCS: 32-bit CRC, SPE Scrambling: Enabled 
During the realization of NE80, CRC check character of POS interface is 32-bit and it cannot be configured.
Suggestions
Null

END