M160 Internet Router Hardware Guide
Replacing an SFM
Up to four SFMs can be installedin the router, processing a total of 160 Mpps.
The SFMs are hot-pluggable, as described in Field-Replaceable Units (FRUs) on
page 4. Removing or inserting an SFM causes a brief interruption in forwarding
performance (about 500 ms) as the PacketForwarding Engine reconfigures the
distribution of packetsacross the remaining SFMs.
To replacean SFM, perform the following procedures:
Removing an SFM on page 188
Installing an SFM on page 189
Removing an SFM
To remove an SFM, follow this procedure (see Figure 96):
1. Remove the rear componentcover by loosening the thumbscrew at each
corner of the cover and pulling it straight off the chas sis. For complete
instructions, see “Removingthe Rear Component Cover” on page 86.
2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wris t and
connect the strap toone of the ESD points on the chassis. Make sure the router
is attached to a proper earth ground. For more information about ESD, see
“Preventing ElectrostaticDischarge Damage” on page 226.
4. Press and hold the offline button on the SFM faceplate until the amber LED
labeled FAIL lights, in about 5 seconds.
5. Loosen the thumbscrewon each ejector locking tab (shown in Figure 8), using
a Phillips screwdriverif necessary.
6. Pull the end of each ejector handleoutward until it is nearly perpendicular to
the SFM faceplate.
7. Grasp the ejector handles and pull firmly to sli de the SFM about halfway
outofthechassis.
8. Place one hand under the SFM to support it, slide it completely out of the
chassis, and place it on the antistatic mat or in the elec trostatic bag.
CAUTION: When an SFM is out of the chassis, do not hold it by the ejectorhandles.
They cannot supportits weight.
Do not stackSFMs on top of or under other components. Placeeach one individually
in an electrostatic bagor on itsown antistatic mat on a flat, stable surface.
188 Replacing Packet Forwarding Engine Components