The J2320 and J2350 chassis is a rigid sheet metal structure
that houses all the other router components (see Figure 1 through Figure 7). 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 components described in subsequent sections,
the chassis includes the following components:
Mounting brackets—One pair of metal brackets can
be mounted at the front or center of the chassis for mounting the
chassis in a rack or cabinet.
Earthing terminal—A protective earthing terminal
and a PEM nut 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 terminal on the rear of the chassis is provided
to connect the router to ground (see Figure 3). Additional grounding is provided to an AC-powered router
when you plug its power supply into a grounded AC power receptacle.
Table 4 summarizes
the physical specifications for the router chassis.
Table 4: J2320 and J2350 Physical Specifications
Description
Value
Chassis dimensions
J2320 Services Router
1.75 in. (4.45 cm) high
17.51 in. (44.48 cm) wide—18.9 in.
(48.01 cm) wide with mounting brackets attached
15.1 in. (38.35 cm) deep—plus 0.78 in.
(1.98 cm) of hardware that protrudes from the chassis front
J2350 Services Router
2.61 in. (6.63 cm) high
17.51 in. (44.48 cm) wide—18.9 in.
(48.01 cm) wide with mounting brackets attached
15.1 in. (38.35 cm) deep—plus 0.78 in.
(1.98 cm) of hardware that protrudes from the chassis front
Router weight
J2320 Services Router
Minimum (no PIMs): 14.8 lbs (6.7 kg)
Maximum (three PIMs): 15.9 lbs (7.2 kg)
J2350 Services Router
Minimum (no PIMs): 16.3 lbs (7.4 kg)
Maximum (five PIMs): 18.2 lbs (8.3 kg)
J2320 and J2350 Midplane
The J2320 and J2350 midplane is located in the center of the
chassis and forms the rear of the PIM card cage (see Figure 6 and Figure 7). 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.
J2320 and J2350 Routing Engine Hardware
The Routing Engine consists of the following components:
Processor—Creates the packet forwarding switch fabric
for the router and runs JUNOS 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). The Crypto Module is an optional feature of J2320 and J2350 Services Routers.
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. J Series routers have
a primary or internal compact flash located on the system board. For
information about replacing the internal compact flash, see Replacing Internal Compact Flashes on J2320 and J2350 Routers.
J2320 and J2350 Services Routers also provide a slot in the rear
of the chassis into which you can insert an additional external compact
flash. For information about external compact flashes, see J2320 and J2350 External Compact Flashes.
J2320 and J2350 Boot Devices
J2320 and J2350 Services Routers can boot from three devices:
Internal compact flash
External compact flash (also known as the removable compact
flash)
USB storage device
Normally, a J2320 or J2350 Services Router boots from the internal
compact flash. If the internal compact flash fails, the router attempts
to boot from the external compact flash if it is installed. If the
external compact flash is not present or fails, the router attempts
to boot from the USB storage device.
J2320 and J2350 Front Panel
The front panel of a J2320 or J2350 Services Router (see Figure 8 and Figure 9) allows you to install or
remove PIMs, view router status LEDs, access the console port, and
perform simple control functions.
Figure 8: Front of J2320 Chassis
Figure 9: Front of J2350 Chassis
The components of the front panel, 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.
The J2320 front panel has three slots and the J2350 front panel
has five slots for field-replaceable PIMs. These slots are numbered
from top to bottom and from left to right as shown in Figure 10.
Slot 0 is a fixed interface module that contains four built-in
Gigabit Ethernet ports. For more information, see Built-In
Gigabit Ethernet Ports.
Figure 10: Slot Number Diagram on
J2320 and J2350
Power Button and POWER
LED
The power button is located on the left side of the front panel
(see Figure 1). 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 5 describes
the POWER LED.
Table 5: J2320
and J2350 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 6 describes the STATUS LED.
Table 6: J2320
and J2350 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 amber 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 7 describes the ALARM LED.
Table 7: J2320
and J2350 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
an amber 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 8 describes the HA LED.
Table 8: J2320 and
J2350 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 9 describes the built-in
Ethernet port LEDs.
Table 9: 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 J Series Services Router is
for future use and is not activated.
USB
Port
The USB ports on the front panel of the router (see Figure 8 and Figure 9) 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.
J2320 and J2350 External Compact Flashes
On J2320 and J2350 routers, an external compact flash, also
known as removable compact flash, accepts a type I or II compact flash,
as defined in the CompactFlash Specification published
by the CompactFlash Association. The J2320 and J2350 chassis has a
slot on the rear for external compact flashes (see Figure 3). When the external compact
flash is installed and configured, it automatically acts as the secondary
boot device if the internal compact flash fails on startup.
Depending on the capacity of the external compact flash, you
can also configure it to receive any core files generated during a
failure. For information about configuring an external compact flash,
see the JUNOS Software Administration Guide.
J2320 Power System
The J2320 Services Router uses AC power (see Figure 3). The autosensing power supply
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 J2320 AC-powered chassis has a power switch and does not
include a power LED.
The J2350 Services Router uses either AC or DC power. The autosensing
power supply (see Figure 4 or Figure 5) 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 J2350 AC-powered or DC-powered chassis has a power switch
and does not include a power LED.
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.
J2320 and J2350 Cooling System
The cooling system in J2320 and J2350 routers is from side to
side. The J2320 router has five cooling fans and the J2350 router
has four cooling fans. The fans draw air through vents along the left
side of the chassis and exhaust it through vents on the right side
of the chassis. The airflow produced by these fans keeps router components
within the acceptable temperature range (see Figure 11 and Figure 12). The speed of the fans is adjusted automatically according
to the current temperature.
On J2350 routers that comply
with Network Equipment Building System (NEBS) criteria, an air filter
protects the air intake opening at the front of the chassis and must
be replaced periodically. 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.
For instructions on how to replace air filters, see Replacing Air Filters on J2350 Routers.
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.
J2320 and J2350 routers shut down when the CPU temperature reaches
80°C (176°F). There is no 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.
An additional fan is part of each power supply. This fan is
not regulated by the operating system.
