However topology may be restricted. "Connection oriented service is available in some cities, usually based upon a central hub topology."[0] [0] https://www.r

However topology may be restricted. "Connection oriented service is available in some cities, usually based upon a central hub topology."[0] [0] https://www.rfc-editor.org/rfc/rfc1149 https://www.rfc-editor.org/rfc/rfc1149