The J4350 and J6350 chassis is a rigid sheet metal structure
that houses all the other router components (see Figure 13 through Figure 18). The chassis can
be installed in many types of racks or cabinets. For information about
acceptable rack types, see Rack Requirements.
In addition to the features described in subsequent sections,
the chassis includes the following features:
Mounting brackets—One pair of metal brackets can
be mounted at the front or center of the chassis. Use the brackets
for mounting the chassis in a rack or cabinet.
Earthing terminals—Two protective earthing terminals,
PEM nuts at the rear of the chassis ensure safe dissipation of static
electricity in all situations.
ESD point—One electrostatic discharge (ESD) point,
a banana plug receptacle at the front of the chassis, minimizes the
risk of electrical discharge in potentially hazardous environments.
Caution:
Before removing or installing components of a functioning router,
attach an ESD strap to an ESD point and place the other end of the
strap around your bare wrist. Failure to use an ESD strap could result
in damage to the router.
The router must be connected to earth ground during normal operation.
The protective earthing terminals on the rear of the chassis are provided
to connect the router to ground (see Figure 14). Additional grounding
is provided to an AC-powered router when you plug its power supply
into a grounded AC power receptacle.
Note:
The J4350 AC-powered chassis has a power switch and does not
include a power supply LED (unlike the J6350 AC-powered chassis).
Figure 15: Rear of J6350
AC-Powered Chassis
Figure 16: Rear of J4350 DC-Powered Chassis
Figure 17: Rear of DC-Powered J6350 Chassis
Figure 18: J4350 and J6350 Hardware
Components
Table 10 summarizes
the physical specifications for the router chassis.
Table 10: J4350
and J6350 Physical Specifications
Description
Value
Chassis dimensions
3.44 in. (8.74 cm) high
17.44 in. (44.3 cm) wide—19.44 in.
(48.38 cm) wide with mounting brackets attached
21.13 in. (53.67 cm) deep—plus 0.5 in.
(1.27 cm) of hardware that protrudes from the chassis front
Router weight
J4350 Services Router:
Minimum (no PIMs): 23 lb (10.4 kg)
Maximum (six PIMs): 25.3 lb (11.5 kg)
J6350 Services Router
Minimum (no PIMs and one power supply): 25.5 lb (11.6 kg)
Maximum (six PIMs and two power supplies): 30.7 lb
(13.9 kg)
J4350 and J6350 Midplane
The midplane is located in the center of the chassis and forms
the rear of the PIM card cage (see Figure 18). You install the
PIMs into the midplane from the front of the chassis. Data packets
are transferred across the midplane from the PIM to the Routing Engine,
and from the Routing Engine across the midplane to the destination
PIM.
J4350 and J6350 Routing Engine Hardware
The Routing Engine consists of the following components.
Processor—Creates the packet forwarding switch fabric
for the router and runs JUNOS Internet software to maintain the router's
routing tables and routing protocols.
DRAM—Buffers incoming packets and provides storage
for the routing and forwarding tables and for other Routing Engine processes.
To view the amount of DRAM installed on your router, issue the show chassis routing-engine command.
EPROM—Stores the serial number of the Routing Engine.
To view the serial number of the Routing Engine, issue either
the show chassis routing-engine command or the show chassis
hardware command.
Crypto Accelerator Module—Processor
card that enhances performance of cryptographic algorithms used in IP security
(IPSec) services. The cryptographic algorithms supported include Advanced
Encryption Standard (AES), Data Encryption Standard (DES), triple DES (3DES),
Hashed Message Authentication Code-Message Digest 5 (HMAC-MD5), and HMAC-Secure
Hash Algorithm 1 (SHA-1).
To determine whether there is a Crypto Accelerator Module installed
on your router, issue the show chassis hardware command.
Compact flash—Provides primary storage for software
images, configuration files, and microcode. J4350 and J6350 routers have a slot on the motherboard for an internal compact
flash. For information about replacing the compact flash, see Replacing Internal Compact Flashes on J4350 and J6350 Routers.
J4350 and J6350 Boot Devices
The J4350 and J6350 Services Routers can boot from two devices:
Internal compact flash
USB storage device
Normally, the J4350 or J6350 Services Router boots from the internal
compact flash. If the compact flash fails, the router attempts to
boot from the USB storage device.
J4350 and J6350 Front Panel
The front panel of the Services Router (see Figure 19) allows you to install
or remove PIMs, view router status LEDs, access the console port,
and perform simple control functions.
Figure 19: Front of J4350 and
J6350 Chassis
The components of the front panel, from left to right, are described
in the following sections:
Physical Interface Modules (PIMs) provide the physical connection
to various network media types. For information about individual PIMs,
see Field-Replaceable PIMs.
Each J4350 and J6350 Services Router has six front panel slots
for field-replaceable PIMs. These slots are numbered from top to bottom
and from left to right as shown in the slot number diagram on the
front panel, shown in Figure 20.
Figure 20: Slot Number Diagram on
Front Panel
Gigabit Ethernet and 4-port
Fast Ethernet ePIMs can be installed in high-speed slots only. High-speed
slots are indicated by a black triangle containing an E in the front panel slot number diagram. On J4350 Services Routers,
the high-speed slots are slot 3 and slot 6. On J6350 Services Routers,
the high-speed slots are slots 2, 3, 5, and 6.
Slot 0 is the fixed interface module that contains the
built-in Ethernet ports.
Power Button and POWER
LED
The power button is located on the left side of the front panel
(see Figure 19). You can use
the power button to power the Services Router on and off. When
you power on the router, the Routing Engine boots as the power supply
completes its startup sequence.
The POWER LED is located to the upper left of the LED
dashboard. Table 11 describes the POWER LED.
Table 11: POWER LED
Color
State
Description
Green
On steadily
Power is functioning correctly.
Blinking
Power button has been pressed and quickly released, and the
router is gracefully shutting down.
Unlit
Off
Router is not receiving power.
After the router is powered on, status indicators—such
as LEDs on the front panel and show chassis command
output—can take up to 60 seconds to indicate that the power
supply is functioning normally. Ignore error indicators that appear
during the first 60 seconds.
If you need to power off the router after the Routing Engine
finishes booting, use the J-Web interface or the CLI to halt the Services Router first.
For instructions, see the JUNOS Software Administration Guide. Alternatively,
you can press and release the power button to gracefully shut down
the router. For more information, see Powering a Services Router On and Off.
STATUS LED
When the system is powered on, the STATUS LED changes
from off to blinking green. Startup takes approximately 90 seconds
to complete. If you want to turn the system off and on again, we recommend
waiting a few seconds between shutting it down and powering it back
up. Table 12 describes the STATUS LED.
Table 12: STATUS LED
Color
State
Description
Green
Blinking
Router is starting up or performing diagnostics.
On steadily
Router is operating normally.
Red
Blinking
Error has been detected.
ALARM LED
The ALARM LED lights yellow to indicate a minor condition
that requires monitoring or maintenance and lights red to indicate
a major condition that can result in a system shutdown. When the condition
is corrected, the light turns off. Table 13 describes the ALARM LED.
Table 13: ALARM LED
Color
State
Description
Red
On steadily
Major alarm indicates a critical situation on the router that
has resulted from one of the following conditions. A red alarm condition
requires immediate action:
One or more hardware components have failed.
One or more hardware components have exceeded temperature
thresholds.
An alarm condition configured on an interface has triggered
a critical warning.
Yellow
On steadily
Minor alarm condition requires monitoring or maintenance:
Indicates a noncritical condition on the router that,
if left unchecked, might cause an interruption in service or degradation
in performance.
A missing rescue configuration or software license generates
a yellow system alarm.
The HA (high availability) LED is located in the front panel
near the power status LED of the LED dashboard. The LED lights when
the router starts, but otherwise remains unlit.Table 14 describes the HA LED.
Table 14: HA LED
Color
State
Description
Green
On steadily
All cluster members and monitored links are available.
Red
On steadily
A cluster member is missing or unreachable, or the other node
is no longer part of a cluster because it has been disabled by the
dual membership and detection recovery process in reaction to a control
link or fabric link failure.
Amber
On steadily
All cluster members are present, but one or more monitored links
are down.
Unlit
Off
The node is not configured for clustering or it has been disabled
by the dual membership and detection recovery process in reaction
to a control link or fabric link failure.
RESET CONFIG Button
Use the RESET CONFIG button to return the router to
a previous valid configuration or to the factory default configuration,
or a rescue configuration. The button is recessed to prevent it from
being pressed accidentally. For details about the RESET CONFIG button, see Resetting the Configuration File When the Router Is Inaccessible.
Built-In
Gigabit Ethernet Ports
Four built-in Gigabit Ethernet ports provide LAN connections
over copper interfaces to hubs, switches, local servers, and workstations.
You can also designate an Ethernet port for management traffic. When
configuring one of these ports, you use the interface name that corresponds
to the port’s location. From left to right on the front panel,
the interface names for the ports are ge-0/0/0, ge-0/0/1, ge-0/0/2, and ge-0/0/3.
Each port has two LEDs, a TX/RX LED on the left side
and a LINK LED on the right side. Table 15 describes the built-in Ethernet port LEDs.
Table 15: Gigabit Ethernet Port
LEDs
Function
Color
State
Description
LINK
Green
On steadily
Port is online.
Unlit
Off
Port is offline.
TX/RX
Green
Blinking
Port is transmitting or receiving data.
Unlit
Off
Port might be online, but it is not receiving data.
Console Port
You can use the console port on the chassis front panel to connect
to the Routing Engine through an RJ-45 serial cable. From the chassis
console port, you can use the CLI to configure the router. The console
port is configured as data terminal equipment (DTE) and supports the
RS-232 (EIA-232) standard.
For information about securing the chassis console port, see
the JUNOS Software Administration Guide.
The port labeled AUX on the front panel of the J4350
or J6350 Services Router is for future use and is not activated.
USB Port
The USB ports on the front panel of the router (see Figure 19) accept a USB storage
device or USB storage device adapter with a compact flash installed,
as defined in the CompactFlash Specification published
by the CompactFlash Association. When a USB storage device is installed
and configured, it automatically acts as a secondary boot device if
the internal compact flash fails on startup. Depending on the size
of the USB storage device, you can also configure it to receive any
core files generated during a failure. For information about configuring
a USB storage device, see the JUNOS Software Administration Guide.
Note:
For a list of supported USB storage devices, see the JUNOS Software Release Notes at http://www.juniper.net.
J4350 Power System
The J4350 Services Router uses either AC or DC power. The autosensing
power supply (see Figure 14 or Figure 16) distributes
the different output voltages to the router components according to
their voltage requirements. The power supply is fixed in the chassis
and is not field-replaceable.
The AC power supply has a single AC appliance inlet that requires
a dedicated AC power feed. The DC power supply has a terminal block
that provides a single DC input (–48 VDC and return) and
requires a dedicated 15 A (–48 VDC) circuit breaker.
The J4350 AC-powered chassis has a power switch and does not
include a power LED.
The J4350 DC-powered
chassis includes a power supply LED located to the upper right of
the power supply connector. Table 16 describes the power supply LED.
Table 16: Power Supply LED
State
Description
Off
No power is flowing to the power supply.
Green
Power supply is connected and power is flowing.
Yellow
Power supply is connected, but the router is not powered on.
Note:
You cannot mix DC and AC power supplies in the same chassis.
Warning:
DC-powered Services Routers are intended for installation only
in a restricted access location.
J6350 Power System
The J6350 Services Router uses either AC or DC power. You
can install one or two autosensing, load-sharing power supplies on
the system board at the bottom of the chassis, as shown in Figure 15 or Figure 17. The power supplies distribute
the different output voltages to the router components, depending
on their voltage requirements. When two power supplies are installed
and operational, they automatically share the electrical load.
For full redundancy, two power supplies are required. If a power
supply stops functioning for any reason, the second power supply instantly
begins providing all the power the router needs for normal functioning.
It can provide full power indefinitely.
Each power supply has an LED located to the upper right of the
power supply connector. Table 16 describes the power supply LED.
Power supplies on J6350 Services Routers are hot-removable and
hot-insertable. You can remove and replace a redundant power supply
without powering down the router or disrupting the routing functions.
To avoid electrical injury, carefully follow the instructions in Replacing Power System Components.
Note:
You cannot mix DC and AC power supplies in the same chassis.
Warning:
DC-powered Services Routers are intended for installation only
in a restricted access location.
J4350 and J6350 Cooling System
The cooling system includes three fans at the rear of the chassis.
The airflow produced by these fans keeps router components within
the acceptable temperature range (see Figure 21). The speed of the fans is adjusted automatically according
to the current temperature.
The Routing Engine monitors
the temperature of the router components. If the maximum temperature
specification, as measured at the CPU junction, is exceeded and the
router cannot be adequately cooled, the Routing Engine shuts down
the hardware components.
When the CPU temperature reaches 80°C (176°F), a yellow
alarm is triggered. When the CPU temperature reaches 105°C (221°F),
the system shuts down. There is no red alarm for temperature. You
can view the CPU junction temperature using the show chassis routing-engine command. The CPU temperature runs a few degrees higher than the
routing engine temperature displayed on the Monitor>Chassis page of
the J-Web interface.
Note:
On J4350 and J6350 routers that are not designed to
comply with Network Equipment Building System (NEBS) criteria, the
temperature at which the system shuts down is 90°C (194°F)
rather than 105°C (221°F). To verify that the system is a
NEBS-compliant system, run the show chassis hardware command.
A NEBS-compliant system displays the term NEBS in the output.
An additional fan is part of each power supply. This fan is
not regulated by the operating system.
Figure 21: Airflow Through the J4350
and J6350 Chassis
