Straight-Through Cable

The straight-through cable is a mandatory Ethernet cable for the BSC. The number of straight-through cables to be configured depends on actual requirements.

When the BSC is configured with the GBAM, the straight-through cable is used to connect:

The GSCU to the GBAM
The GBAM to the LAN switch
The LAN switch to the M2000 (LAN)
The LAN switch to the LMT computer of the BSC
The LAN switch to the CBC

When the BSC is configured with the GOMU, the straight-through cable is used to connect:

Connect the GSCUs in different subracks
The GOMU to the LAN of the customer
The GXPUM to the CBC

Appearance

Figure 1 shows the straight-through cable.

Figure 1 Straight-through cable

Pin Assignment

Table 1 describes the pins at both ends of the straight-through cable.

**Table 1** Pins at both ends of the straight-through cable
X1 End	Wire Color	X2 End	Wire Color
X1-1	White and orange	X2-1	White and orange
X1-2	Orange	X2-2	Orange
X1-3	White and green	X2-3	White and green
X1-4	Blue	X2-4	Blue
X1-5	White and blue	X2-5	White and blue
X1-6	Green	X2-6	Green
X1-7	White and brown	X2-7	White and brown
X1-8	Brown	X2-8	Brown

Installation Position (Configuration Type A)

When straight-through cables are used to connect the active and standby GSCUs in the GMPS to the GBAM, one end of one straight-through cable is connected to the active GSCU, and the other end of the cable is connected to one internal Ethernet port on the GBAM. (Both ends of each straight-through cable are RJ45 connectors.) One end of the other straight-through cable is connected to the standby GSCU, and the other end of the cable is connected to the other internal Ethernet port on the GBAM. Figure 2 shows the installation position of the straight-through cable.
Figure 2 Connections between the GSCUs and the GBAM
When the straight-through cable is used to connect the GBAM to the LAN switch, one end of the cable is connected to port 2 on the LAN switch, and the other end of the cable is connected to an external Ethernet port on the GBAM. Figure 3 shows the installation position of the straight-through cable.
Figure 3 Connection between the GBAM and the LAN switch
When the straight-through cable is used to connect the LAN switch to the M2000 (LAN), one end of the cable is connected to port 24 on the LAN switch, and the other end of the cable is connected to the M2000 (LAN). Figure 4 shows the installation position of the straight-through cable.
Figure 4 Connection between the LAN switch and the M2000 (LAN)
When the straight-through cable is used to connect the LAN switch to the BSC LMT computer, one end of the cable is connected to port 22 on the LAN switch, and the other end of the cable is connected to the BSC LMT computer. Figure 5 shows the installation position of the straight-through cable.
Figure 5 Connection between the LAN switch and the BSC LMT computer
When the straight-through cable is used to connect the LAN switch to the CBC, one end of the cable is connected to port 20 on the LAN switch, and the other end of the cable is connected to the corresponding Ethernet port of the CBC. Figure 6 shows the installation position of the straight-through cable.
Figure 6 Connection between the LAN switch and the CBC

Installation Position (Configuration Type B)

The Straight-through cable is used to connect the GSCUs in different subracks.
Figure 7 shows the installation position of the Straight-through cable.

Figure 7 Installation position of the Straight-through cable between the GSCUs
When the straight-through cable is used to connect the GOMU to the LAN of the customer, one end of the cable is connected to port 0 or port 1 on the GOMU, and the other end of the cable is connected to the Ethernet port of the LAN of the customer. Figure 8 shows the installation position of the straight-through cable.
Figure 8 Connection between the GOMU and the LAN of the customer

NOTE:
The number of Ethernet cables used to connect the active and standby GOMUs to the LAN of the customer can be two or four, depending on the customer's requirement.
When the straight-through cable is used to connect the GXPUM to the CBC, one end of the cable is connected to the Ethernet port on the GXPUM panel, and the other end of the cable is connected to an Ethernet port of the CBC. Figure 9 shows the installation position of the straight-through cable.
Figure 9 Connection between the GXPUM and the CBC