NE80E connects to the 7507 of C company through POS port, and the link layer is encapsulated with HDLC protocol. The physics layer is up and link layer protocol is up, but can not ping ,so interconnection fails.
Check NE80E and C7505 POS parameter
1.Link layer protocol is HDLC, C default is HDLC,Huawei default is PPP
2.CRC bit number is 16, C default is 16bit,Huawei default is 32bit
3.POS non-scramble,C default is non-scramble ,Huawei default is scramble
4.Encapsulation of Physical layer of POS is SDH ,C is defaulted to encapsulate with SONET ,Huawei is defaulted to encapsulate with SDH.
5.C2（Path signal label byte）is wrong, C default is HEX(0XCF),Huawei default is DEC(22), so change Huawei POS configuration:flag c2 207 is match to C default configuration.
1.The parameter of two POS ports differ.
2.POS port is problematic.
By default, the configuration of POS of NE80E differs to that of C equipment in most aspects, so it needs to change the relevant configurations for interconnection of POS ports.
Before interconnection to different factory equipment, we must clear the default parameter of other factory equipment.