ANALOG SLIC CIRCUIT FOR EXCHANGE SUBSCRIBER BOARD REMOVABLE BROADCAST NOISE SIGNALS

摘要

PURPOSE: An analog SLIC circuit for an exchange subscriber board removable broadcast noise signals is provided to prevent system misoperation due to broadcast noise signals by interrupting the broadcast noise signals by condensers in advance. CONSTITUTION: A SLIC(Subscriber Line Interface Circuit)(20) includes a filter(100) removing broadcast noise signals flowed into a relay(21) connected with a TIP end and a RING end of a telephone line. The filter includes a first condenser(C1) and a second condenser(C2). The first condenser(C1) is connected with the TIP end of the telephone line and the relay(21) to pass the broadcast noise signals flowed in through the TIP end of the telephone line to a ground. The second condenser(C2) is connected with the RING end of the telephone line and the relay(21) to pass the broadcast noise signals flowed in through the RING end of the telephone line to the ground.