MX304 Chassis

MX304 Chassis Description

The router chassis is a rigid sheet metal structure that houses all the router components. Figure 1 and Figure 2 show the front of the chassis configured with two Routing Engines. Figure 3 and Figure 4 show the front of the chassis with one Routing Engine configured. The chassis measures 3.5 in. (8.89 cm) high, 17.63 in. (44.8 cm) wide, and 24.01 in. (61 cm) deep. The chassis installs in a standard 800-mm-deep open rack, 19-in. equipment racks, or telco open-frame racks. The total weight of a fully-loaded router (two Routing Engines and two LMICs): up to 70.54 lb (32 kg). For more information, see MX304 Site Guidelines and Requirements.

Figure 1: Front View of the MX304 Router (Two Routing Engines Installed)

Figure 2: Components on the Front View of the MX304 Router (Two Routing Engines Installed)

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Routing Engines in slot RE 0

and RE 1/LMIC2

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LMICs installed in LMIC slots LMIC 0 and LMIC 1

Figure 3: Front View of the MX304 Router (One Routing Engine Installed)

Figure 4: Components on the Front View of the MX304 Router (One Routing Engine Installed)

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Routing Engine in slot RE 0

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LMICs installed in LMIC slots LMIC 0, LMIC 1, and RE 1/LMIC2

The router comes in three variants: AC-powered, DC-powered, and high-voltage AC/DC (HVAC/DC) powered. Figure 5 and Figure 6 show the rear view of the AC-powered MX304 router. Figure 7 and Figure 8 show the rear view of the DC-powered MX304 router. Figure 9 and Figure 10 show the rear view of the HVAC/DC-powered MX304 router.

Figure 5: Rear View of the AC-Powered MX304 Router

Figure 6: Components of the Rear View of the AC-Powered MX304 Router

1 — AC power supplies	3 — Fan modules
2 — Timing interface ports

Figure 7: Rear View of the DC-Powered MX304 Router

Figure 8: Components of the Rear View of the DC-Powered MX304 Router

1 — DC power supplies	3 — Fan modules
2 — Timing interface ports

Figure 9: Rear View of the HVAC/DC-Powered MX304 Router

Figure 10: Rear View of the HVAC/DC-Powered MX304 Router

1 — HVAC/DC power supplies	3 — Fan modules
2 — Timing interface ports

Figure 11 shows the electrostatic discharge (ESD) points on the router.

CAUTION:

Before removing or installing components, 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 hardware components.

Figure 11: ESD Points on the MX304 Router

MX304 Front and Rear Panel Components

The slots in the MX304 router's front panel contains the Routing Engine(s), LMIC ports, and the air filter unit. The Routing Engine LEDs provide at-a-glance status of the components.

Front Panel Components
Rear Panel Components
Timing Interface Ports

Front Panel Components

Table 1 lists the components on the MX304 router front panel.

Table 1: Front Panel Components in a Fully Configured MX304 Router
Component	Slots	Number of FRUs
Routing Engines with LEDs for the router components, online/offline, reset buttons, auxiliary ports, console ports, and management ports	RE0 and RE1/LMIC2	1 or 2
LMICs with 4x400 GbE ports or 16x100 GbE ports or a combination.	LMIC0, LMIC1, and RE1/LMIC2 (if 3 LMICs are installed).	2 or 3
Air filter unit consists of three parts:the outer filter cover, the air filter, and the inner cage		1

Rear Panel Components

Table 2 lists the MX304 router's rear panel components.

Table 2: Rear Panel Components in a Fully Configured MX304 Router
Component	Slots	Number of FRUs
Power supply module	0 through 1	2
Fan module	0 through 2	3

Timing Interface Ports

Figure 12 lists the components on the MX304 router's timing interface ports.

Figure 12: Timing Interface Ports

1 — 10MHz (one input and one output), 1PPS (one input and one output)	3 — BITS—Building-integrated timing supply (BITS)
2 — ToD—Time of day (TOD)	4 — GM/PTP—PTP grandmaster clock port

Here's a definition of the ports and labels on the timing interface ports. See Figure 12 for a description of the timing ports LED indicators.

BITS—Building-integrated timing supply (BITS) external clocking interface for connecting to external clocking devices.
ToD—Time-of-day (TOD) port for connecting to external timing signal sources.
10MHz—10-MHz input and output clocking ports for connecting to external clock signal sources. The clocking ports synchronize clock inputs based on the clock’s priority.
PPS—1-pulse per second (PPS) input and output connectors for connecting to external clock signal sources. The clocking ports synchronize clock inputs based on the clock’s priority.
GM/PTP—PTP grand master clocking port. It support 1-GbE and 10-GbE.

MX304 Timing Ports Module LEDs

Table 3 shows the status LED for GM and BITS ports.

Table 3: Timing Ports LEDs on the MX304 Chassis
LED	Color	State	Description
Link LED for GM port	Unlit	Off	No transceiver is present.
	Green	On steadily	A link is established. The interface is up.
	Green	Blinking or flickering	The beacon feature is enabled.
	Yellow	Blinking	An error has occurred.
BITS	Green	On steadily	Clock is active.
BITS	Yellow	On steadily	Loss of clock.

MX304 Cable Management Bracket Description

The cable management bracket (see Figure 13) consists of dividers and installs on the front of the chassis. The cable management bracket enables you to route the cables outside the router and away from the Routing Engines and LMICs. The cable management kit (JNP-CABLEMGMT-2RU) is orderable.

Figure 13: Cable Management Bracket

The air filter unit (optional) is installed on the cable management brackets. Before installing the air filter unit, ensure that the cable management brackets are already installed on the front of the router. Figure 14 shows the air filter unit along with the cable management brackets installed on the router.

Figure 14: Cable Management Brackets and Air Filter Unit Installed on the Router

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