Cisco VCO/4K Manuale utente

CHAPTER

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System Enclosure

The VCO/4K system enclosure is a metal-based cabinet that houses all the VCO/4K critical system

components including: the fan cooling unit; the alarm arbiter and interface cards; and high-density

system hardware cards. It also accommodates the power subsystem, either single or dual for system

redundancy. Figure 1-1 shows the front of a VCO/4K system. Figure 1-2 shows a cutaway view of the

chassis underneath the enclosure.

The system enclosure meets or exceeds the following enclosure requirements:

•UL 1950 Standard for Information Technology Equipment

•Network Equipment-Building System (NEBS) GR-63-CORE with Zone 4 Earthquake and Bellcore’s

GR-1089-CORE Safety and Physical Protection

•General safety, including UL/CUL and EMI/EMC FCC Part 15

Figure 1-1 The VCO/4K

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Chapter 1 System Enclosure

Figure 1-2 VCO/4K Switch Enclosure and Chassis

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Chapter 1 System Enclosure Specifications

Specifications

Component Description

The VCO/4K system enclosure is designed for environments that require UL 1950 enclosures. Venting

holes on the front door provide air flow to cool system components when the system fan units are

operational. A removable air filter is held in place by a cross-member and two screws on the inside of

the front door. Four screw-in rubber foot pads for bench use are provided as an option. All cable access

is through the back of the system enclosure. Figure 1-3 shows the front of a VCO/4K with the door off.

Figure 1-4 shows the back of the system enclosure.

Part Number Contact your Cisco Systems sales

representative

Front Door Removable front door with locking

feature

Enclosure Dimensions Height: 26.13 inch (67.73 cm)

Width: 17.5 inch (45.33 cm)

Depth: 22.5 inch (58.57 cm)

Footprint 22.50 in. by 17.5 in. (57.15 cm by

45.33 cm)

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Chapter 1 System Enclosure

Component Description

Figure 1-3 VCO/4K (Front View—Door Off)

CONTROLLER

COMBINED

CONTROLLER

COMBINED

For Redundant configuration use slots 1,2, 3-4, 5-6

For Non-Redundant configuration use slots 1,3-4

INSERT ONLY CARDS DESIGNATED BELOW

WRIST STRAP HERE

CONNECT ESD

NBCNBC

SSCCOOSSTTEEMMSS

AAC

AUTO

ACO

AUX 2

AUX 1

MINOR

MAJOR

ALARMS

ACTIVE

ACO

SELECT

RESET B

FAIL

CPU

STATUS

RUN

SCON

RMT RST

ABORT

RESET

MOTOROLA

FAIL

CPU

STATUS

RUN

SCON

RMT RST

ABORT

RESET

MOTOROLA

RING

GEN.

POWER

GEN.

RING

POWER

Alarm Arbiter Card

LEDs

Power

Module

LED

HDD

NBC3

LEDs

Plunger

Switch

Tab

40040

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Chapter 1 System Enclosure Component Description

Figure 1-4 VCO/4K (Rear View)

Front Door

The VCO/4K front door has a lock for security purposes. Two door frame latches at the top and two studs

at the bottom hold the door in place.

Caution The front door must remain on during system operation for NEBS EMI compliance.

The inside of the door contains an air filter made of UL 94 HF-1 foam. The removable air filter should

be regularly vacuumed to remove any accumulated dust.

To remove the front door:

Step 1 If necessary, unlock the front door. The lock is located at the center of the door between the door latches.

Step 2 Flip up the two door latches located to the right and left of the lock. Hold the latches and pull the door

approximately three inches away from the system enclosure. Grasp the sides of the door and lift it up

and away to clear the studs located at the base of the enclosure.

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Chapter 1 System Enclosure

Component Description

Step 3 Carefully remove the door and place it in an area where it will not become damaged.

To install the front door:

Step 1 Grasp the sides of the door and position it so that the bottom is aligned with the studs located at the base

of the enclosure.

Step 2 Flip up the two door latches located to the right and left of the lock. Hold the latches in the open position

and push the door toward the system enclosure until it snaps closed. Press the door latches in.

Step 3 Lock the door.

Caution To ensure security, always lock the front door of the enclosure after you have performed

service procedures.

Mounting Options

The VCO/4K may be installed in an EIA standard cabinet that is 19 inches wide. If the VCO/4K will be

installed in a cabinet or rack, a mounting shelf must be secured to the cabinet/rack and a mounting brace

must be secured to the VCO/4K before it is lifted and placed in the cabinet or rack. Figure 1-5 shows the

mounting brace (one on each side) for the VCO/4K.

Refer to the Cisco VCO/4K Site Preparation Guide for specifications on the mounting brace and shelf.

Refer to the Cisco VCO/4K Hardware Installation Guide for information on attaching the mounting

brace and shelf.

Two rear support holes are located at the base of the each side panel. You have the option of fabricating

and attaching brackets for additional support when mounting the VCO/4K in a cabinet or rack.

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Chapter 1 System Enclosure Moving the System Enclosure

Figure 1-5 Mounting Brace

Moving the System Enclosure

If the VCO/4K is mounted in a cabinet or rack, you must remove it from the cabinet or rack before

moving it to another location.

Caution Follow ESD rules when removing system components. Be sure to use a wrist strap for

grounding. At least two people are required to move the system enclosure.

To move the system enclosure:

Step 1 Power down the system by turning off the power switch at the rear of the enclosure.

Step 2 Disconnect the power connector from the power entry module.

Step 3 Remove the EIA/TIA-232 serial cables, parallel printer cables, and optional Ethernet transceiver cables

connected to the rack. Be sure that all EIA/TIA-232 cables are properly labeled so that they can be

rerouted and reinstalled, as necessary.

Step 4 Remove the network cables from the I/O modules. Be sure that all cables are properly labeled so that

they can be rerouted and reinstalled, as necessary.

Step 5 Disconnect earth ground to the system at the ground point within the enclosure.

Step 6 Remove the power supply module(s) to decrease the weight of the system. For more information, refer

to Chapter 3, “VCO/4K Power Subsystem.”

Step 7 If the VCO/4K is installed in a cabinet or rack, remove the VCO/4K from the cabinet or rack.

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Chapter 1 System Enclosure

Troubleshooting

Step 8 Move the system as follows:

a. To move the system to another location in the same room, lift it into position.

b. To move the system to another location outside the room, repack the system enclosure, including the

power supply modules, in the original shipping container.

The VCO/4K system enclosure must be installed to meet the clearance, environmental, and power

criteria specified in the Cisco VCO/4K Site Preparation Guide. To reinstall the system enclosure, follow

the procedures in the Cisco VCO/4K Hardware Installation Guide.

Troubleshooting

The system enclosure provides passive mechanical and electrical connections to the card rack and power

subsystem. It is highly unlikely that the system enclosure will cause a system failure in the course of

normal operation. The most likely cause of damage to a system enclosure is mechanical damage

resulting in a misalignment of racks or an electrical short circuit within the rack cabling. More specific

causes of damage include:

•Bumping into the enclosure

•Sudden or sharp pulling on network or EIA/TIA-232 cables attached to the I/O modules

•Electrical surge or short circuit at power input feeds

•Short circuit caused by placing or dropping a conductive tool (i.e., screwdriver or pliers) in the

enclosure

•Electrical surge induced through network connections caused by lightning or other high-voltage

conditions

To minimize any chance of mechanical or electrical damage to the enclosure, follow the recommended

system clearances and central office practices for handling the MDF/digital cross-connectors and power

connections. If mechanical or electrical damage does occur, refer to the troubleshooting information in

the appropriate Cisco Systems technical description for the damaged component.

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