BSNL, Calcutta Telephones
will install one small unit BDSU at customer premises. This will
be connected to the telephone line coming
from the IAN equipement installed at the telephone exchange
premises. Both telephone as well as PC (Ethernet Port)
will be connected to the BDSU. BDSU requires 230V A.C to operate. It
combines voice and internet data packets on a single
twisted-pair.wire at the subscriber premises.
IAN separates the telephone signal
and the internet traffic at the telephone exchange premises. While telephone signal is sent to the
telephone exchange. Internet traffic will be sent to the National Internet Backbone of BSNL, bypassing
the telephone exchange.