Functions of the HSC1 board

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The HSC1 board is an OSC board. It receives, processes, and transmits one channel of OSC signals in one direction. It abstracts, processes, and transmits overhead information of the system. It sends the processed information to the SCC board. The HSC1 board has the same functions as the SC1 board, but has higher transmit power.

Other related questions:
Functions of the EFI1 board
The EFI1 board provides the network management port and management serial port. The DIP switch on the EFI1 board is used to set the subrack ID.

Functions of the EFI board
The EFI board provides the alarm output and cascading interfaces, network management interfaces, and inter-subrack communication interfaces.

Functions of the TOM board
The TOM board is an 8-channel Any service processing board. It supports various applications: 1. Functions as a tributary board to perform mutual conversion between ODU0/ODU1 signals and signals at arbitrary rates in the range of 100 Mbit/s to 2.67 Gbit/s. 2. Functions as an OTU board to perform mutual conversion between OTU1 signals and signals at arbitrary rates in the range of 100 Mbit/s to 2.67 Gbit/s. 3. Converges multiple channels of services into one channel of ODU0/ODU1 services.

Functions of boards on U1900
U1900 provides the following types of boards: CVP, ASI, OSU, SCU, MTU, BTU, IP PBX-SMCU, SC1-DTU-4, and SC1-DTU-8. CVP is the control board of U1910/U1930. It provides one digital trunk port (one 1E1/T1 port for U1910 and one 2E1/T1 port for U1930), three 100BASE-TX network ports, and one debugging port. ASI is an analog subscriber interface board. It provides 32 FXS ports. OSU is an analog subscriber and analog trunk interface board. It provides 12 FXS ports and 12 FXO ports. SCU is the control board (mandatory) of U1911/U1960/U1981. It provides four network ports, one USB port, one debugging serial port, and two SD card slots (only one slot available). MTU is a media trunk resource board. It provides two E1/T1 ports and two SD card slots (only one slot available). Each U1911/U1960/U1981 must be equipped with at least one MTU board. BTU is a BRI trunk interface board. It provides four BRI ports and one debugging port. IP PBX-SMCU is the control board of U1980. It provides three 100/1000Base-TX network ports and two debugging ports. SC1-MRS is a media resource system board of U1980. It provides two debugging ports. SC1-DTU-4 is a digital trunk interface board. It provides four E1/T1 ports and one debugging port. SC1-DTU-8 is a digital trunk interface board. It provides eight E1/T1 ports and one debugging port.

Functions of the DCP board
The DCP board is a two-channel OLP protection board. One DCP board provides the function of dual feeding and selective receiving for two channels of signals. The DCP board can implement intra-board 1+1 protection, client 1+1 protection, and OWSP protection.

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