Answer:
Dial up
Step-by-step explanation:
A dial-up connection uses a standard phone line and analog modem to access the Internet at data transfer rates (DTR) of up to 56 Kbps. A dial-up connection is the least expensive way to access the Internet, but it also slowest connection.
Your neighbor sufers slow connection and disconnecting if there is a period of inactivity, then you can believe that he has dial-up internet connection at home.