The invention discloses a
protocol converter, which comprises a
protocol converter shell, a main circuit board, a power supply conversion module, an indicating lamp, a line interface and a
network interface, and is characterized in that the input end of the power supply conversion module is connected with commercial power, and the output end of the power supply conversion module is connected with the main circuit board; the main circuit board comprises a Z interface module, an analog signaling
processing module, a TDM switching module, an SIP
protocol processing module, an
Ethernet switching module, a voice coding and decoding module and a
network address conversion module, and the TDM switching module is in communication connection with the Z interface module, the voice coding and decoding module and the analog signaling
processing module. The
Ethernet switching module is connected with the SIP
protocol processing module, the voice coding and decoding module and the
network address conversion module. According to the invention,
optical network terminal equipment of GPON and XGS-PON has the function of a
session initiation protocol, and then a
protocol converter is developed to realize conversion between an SIP protocol and a
telephone line Z interface, so that
voice communication between kiosk and interval users and a dispatching
desk / duty
desk is realized.