| 摘要 |
PURPOSE: An optical network unit(ONU) of demand-concentrated broadband subscribers, is provided to connect and multiply voice of a general telephone/a public phone, an integrated services digital network(ISDN), N64k, DS1, DS1E and high speed service data services such as an asymmetric digital subscriber line/very high bit rate digital subscriber line(ADSL/VDSL), and to optically transmit STM-4c(STM-1) to an opposed station of a host digital terminal(HDT). So that receiving capacity per shelf can be maximized. CONSTITUTION: An optical network unit main control unit(OMCU) manages and controls information of an optical network unit(ONU) as a main controller, and performs a communication function with a host digital terminal(HDT). An optical network interface unit(ONIU) has a function generating clocks from signals inputted from an external, and an 622Mbps(155Mbps) optical interface function. An extension unit(EXTU) performs three STM-1 connections as a unit for extending a shelf, and relays an asynchronous transfer mode(ATM) cell. An E1T1 unit selectively supplies a 1.544Mbps or 2M dedicated line to each port. A channel test interface unit(CTIU) tests a line/speech path as a subscriber line test unit. Subscriber telephone coin phone/basic rate interface unit/data 64kbpsxN/primary rate interface unit(STCP/BRIU/D64N/PRIU), receive data and clocks from the ONIU and directly connect a subscriber. A subscriber channel unit applies an asymmetric digital subscriber line/very high bit rate digital subscriber line(VDSL/ADSL).
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