I want to ping ip dslam which is in other subnet

connection is like this
MyPc-----Rj45----------Adsl2+ Modem---------Rj11-------Dslam
192.168.1.45-----192.168.1.1---172.80.1.3--------------172.80.1.2

Modem is set to Static Ip Address Encapsulation.

If you require further details ask me.
Thank you.