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E&M Trunk Cable
Description
An E&M trunk cable has an RJ45 connector at one end, and the other end needs to have a connector made onsite according to the device connection requirements.
Structure and Pin Assignments
Figure 8-48 shows the structure of an E&M trunk cable.
Table 8-76 lists the pin assignments of an E&M trunk cable.
Table 8-76 Pin assignments of an E&M trunk cable
X1 (RJ45) |
Wire Color |
Pin Assignment |
Pin Description |
|---|---|---|---|
1 |
White and orange |
SB |
Isolated signal power output |
2 |
Orange |
E |
Used by the PBX to receive control signals |
3 |
White and green |
R1 |
|
4 |
Blue |
R |
|
5 |
White and blue |
T |
|
6 |
Green |
T1 |
|
7 |
White and brown |
M |
Pin used by the PBX to send control signals. The voltage of the M line is -48 V with a deviation of ±3 V. |
8 |
Brown |
SG |
Isolated signal ground |
Figure 8-49 shows the E&M trunk cable connection between the local and remote devices.
An E&M trunk cable can be a shielded or an unshielded cable.
- If a shielded network cable is used as the E&M trunk cable, the local and remote devices can be directly connected using this cable.
- If an unshielded network cable is used as the E&M trunk cable and does not need to be led outdoors, the local and remote devices can be directly connected using this cable.
- If an unshielded network cable is used as the E&M trunk cable and needs to be led outdoors, the local and remote devices must be connected using a cable management strip. For details on how to connect the devices through a cable management strip, see "(Optional) Installing a Cable Management Strip and a Protective Unit" in Hardware Installation and Maintenance Guide of the required router.
Connection
An E&M trunk cable is connected as follows:
- The RJ45 connector is connected to the E&M interface of the local router.
- The other end is connected to the remote device through a network cable or cable management strip.