Radio Transceiver; Grounding Lug; Antennae Types; Usb Port - Juniper SSG 5 Serial Hardware Installation

SSG 5 Hardware Installation and Configuration Guide

Radio Transceiver

Grounding Lug

Antennae Types

USB Port

14
Back Panel
The SSG 5-WLAN devices contain two wireless connectivity radio transceivers,
which support 802.11a/b/g standards. The first transceiver (WLAN 0) uses the 2.4
GHz radio band, which supports the 802.11b standard at 11 Mbps and the 802.11g
at 54 Mbps. The second radio transceiver (WLAN 1) uses the 5GHz radio band,
which supports the 802.11a standard at 54 Mbps. The two radio bands can work
simultaneously. For information on configuring the wireless radio band, see "Basic
Wireless Configuration" on page 33.
A one-hole grounding lug is provided on the rear of the chassis to connect the
device to earth ground (see Figure 5).
To ground the device before connecting power, you connect a grounding cable to
earth ground and then attach the cable to the lug on the rear of the chassis.
The SSG 5-WLAN devices support three types of custom-built radio antennae:
Diversity antennae — The diversity antennae provide 2dBi directional
coverage and a fairly uniform level of signal strength within the area of
coverage and are suitable for most installations. This type of antennae is
shipped with the device.
External omnidirectional antenna — The external antenna provides 2dBi
omnidirectional coverage. Unlike diversity antennae, which function as a pair,
an external antenna operates to eliminate an echo effect that can sometimes
occur from slightly delayed characteristics in signal reception when two are in
use.
External directional antenna — The external directional antenna provides
2dBi unidirectional coverage and is appropriate for locations like hallways and
outer walls (with the antenna facing inward).
The USB port on the back panel of an SSG 5 device accepts a universal serial bus
(USB) storage device or USB storage device adapter with a compact-flash disk
installed, as defined in the CompactFlash Specification published by the
CompactFlash Association. When the USB storage device is installed and
configured, it automatically acts as a secondary boot device if the primary
compact-flash disk fails on startup.
The USB port allows file transfers such as device configurations, user certifications,
and update version images between an external USB storage device and the
internal flash storage located in the security device. The USB port supports USB 1.1
specification at either low speed (1.5M) or full speed (12M) file transfer.