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Replacing IOCs
IOCs are installed horizontally in the front
of the services gateway. The IOCs are hot-insertable and hot-removable.
When you remove an IOC, the services gateway continues to function,
although the IOC being removed no longer functions. Before
replacing anIOC, review the information in Holding a Card. To replace an IOC, use the
following procedures:
Removing an IOC
An IOC weighs up to 13.1 lb (5.9 kg). Be prepared to accept
its full weight.
To remove an IOC (see Figure 54):
- Have ready a replacement IOC or blank
panel and an antistatic mat for the IOC. Also have ready
rubber safety caps for each IOC you are removing that uses
an optical interface.
- Attach an electrostatic discharge (ESD) grounding strap to your bare
wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing
Electrostatic Discharge Damage.
- Label the cables connected
to each port on the IOC so that you can later reconnect
the cables to the correct ports.
- Use one of the following methods to take the IOC offline:
- Disconnect the cables from the IOC.
If the IOC uses fiber-optic cable, immediately cover each
transceiver and the end of each cable with a rubber safety cap. Arrange
the disconnected cables in the cable management system to prevent
the cables from developing stress points.
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Warning:
Do not look directly into a fiber-optic transceiver or into
the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic
cable connected to a transceiver emit laser light that can damage
your eyes.
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Caution:
Do not leave a fiber-optic transceiver uncovered except when
inserting or removing cable. The safety cap keeps the port clean and
prevents accidental exposure to laser light.
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Caution:
Avoid bending fiber-optic cable beyond its minimum bend radius.
An arc smaller than a few inches in diameter can damage the cable
and cause problems that are difficult to diagnose.
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- Simultaneously turn both of the ejector handles counterclockwise
to unseat the IOC.
- Grasp the handles and slide the IOC straight
out of the card cage halfway.
- Place one hand around the front of the IOC and
the other hand under it to support it. Slide the IOC completely
out of the chassis, and place it on the antistatic mat or in the electrostatic
bag.
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Caution:
The weight of the IOC is concentrated in the back
end. Be prepared to accept the full weight—up to 13.1 lb (5.9 kg)—as
you slide the IOC out of the chassis.
When the IOC is out of the chassis, do not hold it
by the ejector handles, bus bars, or edge connectors. They cannot
support its weight.
Do not stack IOCs on top of one another after removal.
Place each one individually in an electrostatic bag or on its own
antistatic mat on a flat, stable surface.
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- If you are not reinstalling an IOC into the
empty slot within a short time, install a blank panel over the slot
to maintain proper airflow in the card cage.
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Caution:
After removing an IOC from the chassis, wait at least
30 seconds before reinserting it, removing an IOC from a
different slot, or inserting an IOC into a different slot.
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Figure 54: Removing an IOC
Installing an IOC
To install an IOC (see Figure 55):
- Attach an electrostatic discharge (ESD) grounding strap to your bare
wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing
Electrostatic Discharge Damage.
- Place the IOC on an antistatic mat or remove
it from its electrostatic bag.
- Identify the slot on the services gateway where it
will be installed.
- Verify that each
fiber-optic transceiver is covered with a rubber safety cap. If it
does not, cover the transceiver with a safety cap.
- Orient the IOC so that the faceplate faces you.
- Lift the IOC into place and carefully
align the sides of the card with the guides inside the card cage.
- Slide the IOC all the way into the card
cage until you feel resistance.
- Grasp both ejector handles and rotate them clockwise
simultaneously until the IOC is fully seated.
- If the IOC uses fiber-optic cable, remove
the rubber safety cap from each transceiver and cable.
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Warning:
Do not look directly into a fiber-optic transceiver or into
the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic
cable connected to a transceiver emit laser light that can damage
your eyes.
|
- Insert the appropriate cables into the cable connector
ports on each IOC (see Figure 56). Secure the cables so
that they are not supporting their own weight. Place excess cable
out of the way in a neatly coiled loop, using the cable management
system. Placing fasteners on a loop helps to maintain its shape.
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Caution:
Do not let fiber-optic cable hang free from the connector. Do
not allow fastened loops of cable to dangle, which stresses the cable
at the fastening point.
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Caution:
Avoid bending fiber-optic cable beyond its minimum bend radius.
An arc smaller than a few inches in diameter can damage the cable
and cause problems that are difficult to diagnose.
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- Use one of the following methods to bring the IOC online:
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Caution:
After the OK LED turns green, wait at least 30 seconds
before removing the IOC again, removing an IOC from
a different slot, or inserting an IOC in a different slot.
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You can also verify that the IOC is functioning correctly
by issuing the show chassis fpc and show chassis fpc
pic-status commands, as described in Maintaining IOCs and SPCs and Maintaining IOC Cables.
Figure 55: Installing an IOC
Figure 56: Attaching a Cable to an IOC
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