Introduction to the USG9000
At present, the USG9000 can work in three modes: routed mode, transparent mode, and composite mode.
- routing mode In routing mode, the USG9000 uses the layer 3 for external connections, and all interfaces must be assigned with IP addresses. When the USG9000 is located between the internal network and the external network, you need to configure the interfaces, through which the USG9000 is connected with the internal network and the external network, with IP addresses on different network segments and re-plan the network topology. In this case, the USG9000 serves as a router. As shown in Figure 2-1, the USG9000 is connected with the internal network through an interface in the Trust zone, while it is connected with the external network through an interface in the Untrust zone. Note that the interface in Trust zone and the interface in Untrust zone reside in different two subnets.
- transparent mode In transparent mode, the USG9000 uses the layer 2 for external connections, and none of the interfaces can be assigned with IP addresses. In this case, the USG9000 is transparent to users in subnets and routers. That is, users do not feel the existence of the USG9000. As shown in Figure 2-2, the USG9000 is connected with the internal network through interfaces in the Trust zone, while it is connected with the external network through interfaces in the Untrust zone. Note that the internal network and the external network must reside in the same subnet.
- composite mode If there are both interfaces working in routing mode (such interfaces have IP addresses) and interfaces working in transparent mode (such interfaces have no IP address) in the USG9000, the USG9000 is working in composite mode. Composite mode is applied in the case of dual-system hot backup with transparent mode. The interface on which VRRP is enabled needs to be configured with an IP address, and other interfaces do not. Figure 2-3 shows a typical networking in composite mode.
Features and Distributed Architecture of the Power Supply SystemThis section describes the features, distributed architecture, and the PEM of the power supply system. If DC power source is used, connect the DC power cables to the PEM input terminals. If AC power source is used, use two suitable external AC-DC convertors. The number of rectifier modules of the AC-DC convertors depends on the system power consumption. The AC-DC convertors converts AC power to DC power and supply DC power to the PEMs. As shown in Figure 1, the USG9580 backplane is divided into four areas, with each area having two power inputs. These eight power inputs work in backup mode.
Table 1 Description of the indicators of the PEM Indicator Color Description RUN Green Indicates normal power output. If the indicator is steady on, it implies the normal output. ALM RedPower failure indicator. If the indicator is steady on, it indicates the following:
- The lightning protection link of the power module failed.
- The power modules does not have input power.
Table 2 Technical parameters of the DC PEM Item Technical Parameter Type PEMB Dimensions (Width x Depth x Height) 58mm x 115mm x 220mm Weight 1.1 kg Number of power inputs 1 Input voltage range -72 V DC to -38 V DC Input rated voltage -48 V DC/-60 V DC Maximum input current 70 A Output voltage -72 V DC to -38 V DC Output current 70 A Rated current of the air-break 70 A (Each PEM is controlled by an air switch).