PDB monitoring signal cable

The power distribution box (PDB) monitoring signal cable is used to transmit monitoring signals from the PDB to the service subracks.

Appearance

Figure 1 shows the PDB monitoring signal cable.

Figure 1 PDB monitoring signal cable

The PDB monitoring signal cable uses a DB9 connector at one end and a DB15 connector at the other end.

Table 1 describes the pins of the PDB monitoring signal cable.

**Table 1** Pins of the PDB monitoring signal cable
Start Point	End Point	Meaning	Remarks
X1.1	X2.3	Tx+	Twisted pair
X1.2	X2.2	Tx-	Twisted pair
X1.3	X2.7	Rx+	Twisted pair
X1.4	X2.6	Rx-	Twisted pair
X1.5	X2.5	RTN	-
X1.SHELL	X2.SHELL	-	X1.SHELL is connected to X2.SHELL through the shielding layer.

Table 2 describes the pins of the PDB monitoring signal cable.

**Table 2** Pins of the PDB monitoring signal cable
Signal Label	Pin Assignment
Tx+	Positive phase signal transmitted
Tx-	Negative phase signal transmitted
Rx+	Positive phase signal received
Rx-	Negative phase signal received

Installation Position

One end of the PDB monitoring signal cable with a DB15 connector is fixed to the service subrack port on the PDB. The other end of the PDB monitoring signal cable with a DB9 connector is fixed to the MONITOR socket on the metal shielding board of the subrack that is located at the bottom of the BSC cabinet.

Figure 2 shows the installation positions of the PDB monitoring signal cable.

Figure 2 Installation positions of the PDB monitoring signal cable

NOTE:

When a cabinet is configured with multiple subracks, you should configure the subracks from bottom to top. Therefore, the PDB monitoring signal cable is always connected to the subrack at the bottom of the cabinet.