Juniper Networks M160 PCG Components, Switching and Forwarding Module SFM, States for PCG LEDs

Hardware Component Overview

PCG Components

Each PCG (shown in Figure 7) has the following components:

Signal generator—Provides a 125-MHz system clock signal.

EEPROM—Stores the serial number and revision level of the PCG.

Three LEDs—Indicate PCG status. There is a blue one labeled MASTER, a green one labeled OK, and an amber one labeled FAIL. Table 6 describes the LED states.

Offline button—Prepares the PCG for removal from the router when pressed.

Figure 7: Packet Forwarding Engine Clock Generator

Offline button

LEDs

Table 6: States for PCG LEDs

1181

Label	Color	State	Description
MASTER	Blue	On steadily	PCG is master.
OK	Green	On steadily	PCG is functioning normally.
		Blinking	PCG is starting up.
FAIL	Amber	On steadily	PCG has failed.

Switching and Forwarding Module (SFM)

The Switching and Forwarding Module (SFM) performs route lookup, filtering, and switching on incoming data packets, then directs outbound packets to the appropriate FPC for transmission to the network. It can process 40 million packets per second (Mpps).

Up to four SFMs can be installed in the router, processing a total of 160 Mpps. The SFMs are hot-pluggable, as described in Field-ReplaceableUnits (FRUs) on page 4. Removing or inserting an SFM causes a brief interruption in forwarding performance (about 500 ms) as the Packet Forwarding Engine reconfigures the distribution of packets across the remaining SFMs.

For SFM replacement instructions, see “Replacing an SFM” on page 188.

Packet Forwarding Engine 19