A POS interface on the NE80 is connected to the remote M40 router of the manufacturer J. Another POS interface on the NE80 is connected to the 12012 router of the manufacturer C. After the configuration, we find that the link and protocol of the POS interface that connects the NE80 to the 12012 router are all Up. The 12012 router can be pinged through. The POS interface that connects the NE80 to the M40 router, however, remains Down.
1. The IP addresses of devices at both ends are correctly assigned.
2. Perform loopback to the NE80 from the NMS of the transmission device of the peer. The interface on the NE80 is Down. Then, perform loopback to the NE80 from the ODF-side device. The interface on the NE80 is Up. Test the optical power from the NE80 to the remote peer. It shows that the luminescence is normal.
3. Replace the link between the NE80 and the M40 with the link between the NE80 and the 12012 router, and vice versa. The 12012 router can be pinged through. This indicates that the link is normal. The problem still lies in that the parameters of interfaces on the NE80 and the M40 are inconsistent. Though devices of the manufacturers J and C are third party devices, the parameters for the communication between the M40 and the NE80 cannot be set the same as that for the communication between the 12012 router and the NE80.
4. SDH links are used so that the communication is not affected even if some parameters for transmission are inconsistent with the parameters of the transmission link between the interfaces that connect the devices at both ends. You can adjust the C2 values of the transmission link.
5. Check whether the C2 values of the POS interfaces on the two routers are consistent. If not, adjust the C2 values to the same. The POS interfaces then become Up and the two routers can communicate.
1. The physical parameters of the POS interface, such as the clock and scrambles, do not match that of the peer interface.
2. The link layer protocols do not match.
3. The IP address of the local device or the peer is not assigned.
4. A fault occurs during the transmission of services.
When the NE80 is connected to devices of other manufacturers, pay attention to the default parameters of each device. You cannot adjust the parameters of the device of a manufacturer (C, for example) based on that of the device of another manufacturer (J, for example). Try to obtain the default parameters of interfaces on devices of different manufacturers as many as possible in the daily work.