Ports on the GGCU Panel

The GGCU panel provides sixteen ports, of which ten ports are labeled CLKOUT, two COM, one TESTOUT, one TESTIN, and two CLKIN.

Table 1 describes the ports on the GGCU panel.

**Table 1** Ports on the GGCU panel
Port	Function	Port
CLKOUT 0 to CLKOUT 9	Synchronization clock output port, used to provide the 8 kHz clock signals to the CLKIN port on the GSCU panel	RJ45
COM0 and COM1	Reserved	RJ45
TESTOUT	Reserved	SMB male connector
TESTIN	Input port for testing external clock signals	SMB male connector
CLKLIN0 and CLKLIN1	Synchronization clock input port, used to receive the 2.048 MHz clock signals or 2.048 Mbit/s code stream signals	SMB male connector