Usb Host Port; External Alarm Contacts; Power Supplies; Ac Power Supply - Juniper BX7000 Hardware Manual

CHAPTER 1: BX7000 Multi-Access Gateway Overview

USB Host Port

External Alarm Contacts

Power Supplies

12 Hardware Components
Use the high-speed 2.0 USB host port, labeled FLASH, to connect a USB mass-storage device,
such as flash drive. The gateway uses this port to read configuration files during the initial startup.
This port supports a USB with Type A connector.
The gateway has four external alarm contacts (also known as potential free contacts) for
connecting the gateway to external alarm devices. The alarm relay contacts are located at the
lower right of the front panel. Whenever a system condition triggers an alarm, the alarm relay
contacts are activated which in turn activates the external alarm devices. Single core wires with a
gauge between 26-AWG and 24-AWG (0.5 to 0.8 mm
devices. For more information, see Connecting to an External Alarm Device on page 35.
The external alarm contact has eight pins that accept single core wire. Use the gauge of wire
appropriate for the external device that you are connecting. Each pair of pins adjacent to each
other, starting from the left, can be used to connect to one external alarm device. A total of four
devices may be connected to the wire-trap connector using the eight pins.
The gateway contains one or two power supplies located on the left side of the front panel of the
chassis. The gateway uses either AC or DC power supplies. For both AC and DC power
configurations, the power supplies are hot-swappable when the gateway contains two power
supplies. If one power supply fails or is removed, the other power supply instantly takes the entire
electrical load without interrupting the operation of the gateway. For more information on AC and
DC power specifications, see "AC Power Specifications" on page 77 and "DC Power Specifications"
on page 78.

AC Power Supply

Each inlet requires a dedicated AC power feed. When both the power supplies are present, they
share the load almost equally within a fully populated gateway. Each power supply provides power
to all components in the gateway. Two AC power supplies provide full power redundancy. One
power supply provides full power to the gateway as long as it is operational. Figure 8 on page 12
shows the AC power supply.
Figure 8: AC Power Supply
DC Power Supply
Each DC power supply provides sufficient power to the fully populated gateway. The DC power
supplies can be either hardened or non-hardened. Two DC power supplies share power equally
within a gateway. Figure 9 on page 13 shows the DC power supply.
2
) are required to connect to external alarm
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