Switch Installation

This chapter describes how to prepare for installation, how to install the switch, and how to make connections to it. Read the topics and perform the procedures in the order that they are presented:

Preparing for Installation

This section covers these topics:

Warnings

These warnings are translated into several languages in "Translated Safety Warnings."

Warning This equipment is to be installed and maintained by service personnel only as defined by AS/NZS 3260 Clause 1.2.14.3 Service Personnel. Statement 88

Warning Only trained and qualified personnel should be allowed to install or replace this equipment. Statement 49

Warning Read the installation instructions before connecting the system to the power source. Statement 1004

Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. Statement 43

Warning Do not stack the chassis on any other equipment. If the chassis falls, it can cause severe bodily injury and equipment damage. Statement 48

Warning The plug-socket combination must be accessible at all times because it serves as the main disconnecting device. Statement 66

Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. Statement 39

Warning To prevent the switch from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of 113° F (45° C). To prevent airflow restriction, allow at least 3 inches (7.6 cm) of clearance around the ventilation openings. Statement 17B

Warning When installing or replacing the unit, the ground connection must always be made first and disconnected last. Statement 1046

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001

Warning Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040

Warning If a redundant power system (RPS) is not connected to the switch, install an RPS connector cover on the back of the switch. Statement 265

Warning To comply with safety regulations, mount switches on a wall with the front panel facing up. Statement 266

Warning The Catalyst 3550-24-DC contains no field-replaceable units (FRUs). Do not open the chassis or attempt to remove or replace any components. For information about obtaining service for this unit, contact your reseller or Cisco sales representative. Statement 121B

Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. Statement 1017

Warning Ethernet cables must be shielded when used in a central office environment. Statement 171

Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003

Warning Class 1 Laser Product Warning

Invisible laser radiation may be emitted from the aperture ports of the 100BaseFX single-mode supervisor engine module. Avoid exposure and do not stare into open apertures. Statement 114

Warning Avoid direct exposure to the laser beam. Statement 1012

Warning An exposed wire lead from a DC-input power source can conduct harmful levels of electricity. Be sure that no exposed portion of the DC-input power source wire extends from the terminal block plug. Statement 122

Warning Voltages that present a shock hazard can exist on inline power circuits if interconnections are made by using uninsulated exposed metal contacts, conductors, or terminals. Avoid using such interconnection methods unless the exposed metal parts are in a restricted access location and users and service people who are authorized to access the location are made aware of the hazard. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. Statement 1072

Warning Attach only the Cisco RPS (model PWR300-AC-RPS-N1) to the RPS receptacle. Statement 100B

Warning Attach only the Cisco RPS (model PWR675-AC-RPS-N1) to the RPS receptacle. Statement 100C

EMC Regulatory Statements

This section includes specific regulatory statements about the Catalyst 3550 family of switches.

U.S.A.

U.S. regulatory information for this product is in the front matter of this manual.

Taiwan

Warning

This is a Class A Information Product, when used in residential environment, it may cause radio frequency interference, under such circumstances, the user may be requested to take appropriate countermeasures. Statement 257

Japan

Warning

This is a Class A product based on the standard of the Voluntary Control Council for Interference by Information Technology Equipment (VCCI). If this equipment is used in a domestic environment, radio disturbance may arise. When such trouble occurs, the user may be required to take corrective actions. Statement 191

Korea

Warning

This is a Class A Device and is registered for EMC requirements for industrial use. The seller or buyer should be aware of this. If this type was sold or purchased by mistake, it should be replaced with a residential-use type. Statement 294

Hungary

Warning

This equipment is a class A product and should be used and installed properly according to the Hungarian EMC Class A requirements (MSZEN55022). Class A equipment is designed for typical commercial establishments for which special conditions of installation and protection distance are used. Statement 256

Site Requirements

When determining where to place the switch, be sure to observe these requirements:

Operating environment is within the ranges listed in "Technical Specifications."
Clearance to front and rear panels is such that

Front-panel indicators can be easily read.
Access to ports is sufficient for unrestricted cabling.
Rear-panel power connector is within reach of an AC power receptacle.

Airflow around the switch and through the vents is unrestricted.
Temperature around the unit does not exceed 113° F (45° C).

Note If the switch is installed in a closed or multirack assembly, the temperature around it might be greater than normal room temperature.

Cabling is away from sources of electrical noise, such as radios, power lines, and fluorescent lighting fixtures. Make sure that the cabling is safely away from other devices that might damage the cables.
For sites requiring compliance to Telcordia GR-1089-CORE Intra-building Lightning requirements, all 10/100 and 10/100/1000 ports must be connected with shielded cable grounded at both ends.

Verifying Package Contents

Note Carefully remove the contents from the shipping container, and check each item for damage. If any item is missing or damaged, contact your Cisco representative or reseller for support. Return all packing material to the shipping container, and save it.

The switch is shipped with these items:

This Catalyst 3550 Series Hardware Installation Guide
Where to Find the Catalyst 3550 Documentation flyer
Product registration card
AC power cord (AC-powered switches)
One RJ-45-to-DB-9 adapter cable
Mounting kit containing:

Four rubber feet for mounting the switch on a table
Two 19-inch rack-mounting brackets
Four Phillips flat-head screws for attaching the brackets to the switch (Catalyst 3550-12T and 3550-12G switches)
Six Phillips flat-head screws for attaching the brackets to the switch (Catalyst 3550-24, 3550-24-DC, 3550-24-FX, 3550-24PWR, and 3550-48 switches)
Four Phillips machine screws for attaching the brackets to a rack
One cable guide and one black Phillips machine screw for attaching the cable guide to one of the mounting brackets
One RPS connector cover (for wall mounting)
Two Phillips pan-head screws (for attaching the RPS cover)
Four Phillips truss-head screws (for wall-mounting brackets)
One DC terminal block plug (also called a terminal block header; only Catalyst 3550-24-DC switches)

Installing the Switch

This section describes these installation procedures:

Rack Mounting

Warning To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to ensure that the system remains stable. The following guidelines are provided to ensure your safety:

This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.
If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in the rack.

To install the switch in a 19-inch or 24-inch rack (24-inch racks require optional mounting hardware), follow the instructions described in these procedures:

Attaching Brackets to the Catalyst 3550-12T and 3550-12G Switches
Attaching Brackets to the Catalyst 3550-24, 3550-24-DC, 3550-24-FX, 3550-24PWR, and 3550-48 Switches
Mounting the Switch in a Rack

Note Installing the switch in a 24-inch rack requires an optional bracket kit not included with the switch. You can order a kit containing the 24-inch rack-mounting brackets and hardware from Cisco. For the Catalyst 3550-12T and 3550-12G switches, order part number RCKMNT-3550-1.5RU=. For the Catalyst 3550-24, 3550-24-DC, 3550-24-FX, 3550-24PWR, and 3550-48 switches, order part number RCKMNT-1RU=.

Attaching Brackets to the Catalyst 3550-12T and 3550-12G Switches

The bracket orientation and the brackets that you use depend on whether you are attaching the brackets for a 19-inch or a 24-inch rack. For 19-inch racks, use bracket part number 700-11523-01; for 24-inch racks, use bracket part number 700-12398-01. Figure 3-1 through Figure 3-6 show how to attach each type bracket to one side of the switch. Follow the same steps to attach the second bracket to the opposite side.

Figure 3-1 Attaching Brackets for 19-Inch Racks, Front Panel Forward

Figure 3-2 Attaching Brackets for 24-Inch Racks, Front Panel Forward

Figure 3-3 Attaching Brackets for 19-Inch Racks, Rear Panel Forward

Figure 3-4 Attaching Brackets for 24-Inch Racks, Rear Panel Forward

Figure 3-5 Attaching Brackets for 19-Inch Telco Racks

Figure 3-6 Attaching Brackets for 24-Inch Telco Racks

Attaching Brackets to the Catalyst 3550-24, 3550-24-DC, 3550-24-FX, 3550-24PWR, and 3550-48 Switches

The bracket orientation and the brackets that you use depend on whether you are attaching the brackets for a 19-inch or a 24-inch rack. For 19-inch racks, use bracket part number 700-8209-01; for 24-inch racks, use bracket part number 700-13248-01. Figure 3-7 through Figure 3-12 show how to attach each type bracket to one side of the switch. Follow the same steps to attach the second bracket to the opposite side.

Note Before you attach the brackets on the Catalyst 3550-24-FX switch, remove the screws that are on the bottom-front of the chassis. Attach the bracket by using the supplied Phillips flat-head screws, as shown in Figure 3-7.

Figure 3-7 Attaching Brackets for 19-Inch Racks, Front Panel Forward

Figure 3-8 Attaching Brackets for 24-Inch Racks, Front Panel Forward

Figure 3-9 Attaching Brackets for 19-Inch Racks, Rear Panel Forward

Figure 3-10 Attaching Brackets for 24-Inch Racks, Rear Panel Forward

Figure 3-11 Attaching Brackets for 19-Inch Telco Racks

Figure 3-12 Attaching Brackets for 24-Inch Telco Racks

Mounting the Switch in a Rack

After the brackets are attached to the switch, use the four supplied number-12 Phillips machine screws to securely attach the brackets to the rack, as shown in Figure 3-13.

Figure 3-13 Mounting the Switch in a Rack

We recommend attaching the cable guide to prevent the cables from obscuring the front panel of the switch and the other devices installed in the rack. Use the supplied black screw, as shown in Figure 3-14, to attach the cable guide to the left or right bracket.

Figure 3-14 Attaching the Cable Guide on the Switch

Wall Mounting

To install the switch on a wall, follow the instructions in these procedures:

Attaching the Brackets to the Switch
Attaching the RPS Connector Cover
Mounting the Switch on a Wall

Note The illustrations in this section show the Catalyst 3550-12T switch as an example. All the Catalyst 3550 switches are wall-mounted following the same procedures.

Attaching the Brackets to the Switch

Figure 3-15 shows how to attach a 19-inch bracket to one side of the switch. Follow the same steps to attach the second bracket to the opposite side.

Note On the Catalyst 3550-24-FX switch, remove the screws that are in the side of the chassis before you attach the brackets.

Figure 3-15 Attaching the 19-Inch Brackets for Wall Mounting

Attaching the RPS Connector Cover

If you are not using an RPS with your switch, use the two Phillips pan-head screws to attach the RPS connector cover to the back of the switch, as shown in Figure 3-16.

Warning If an RPS is not connected to the switch, install an RPS connector cover on the back of the switch.

Figure 3-16 Attaching the RPS Connector Cover on the Switch

Mounting the Switch on a Wall

For the best support of the switch and cables, make sure that the switch is attached securely to wall studs or to a firmly attached plywood mounting backboard. Mount the switch with the front panel facing up, as shown in Figure 3-17.

Warning To comply with safety regulations, mount the switches on a wall with the front panel facing up.

Figure 3-17 Mounting the Switch on a Wall

Table or Shelf Mounting

Follow these steps to install the switch on a table or shelf:

Step 1 Locate the adhesive strip with the rubber feet in the mounting-kit envelope. Attach the four rubber feet to the recessed areas on the bottom of the unit.

Step 2 Place the switch on the table or shelf near an AC power source.

Installing the Optional Ground Kit

For switches that require a two-hole lug for grounding, you can order a kit containing the ground lug and hardware from Cisco. For the Catalyst 3550-12G, 3550-24, and 3550-24-FX switches, order part number NEBS-LUG-3550=.

Note When you install the ground-lug kit, you cannot connect an RPS to the switch.

To install the ground lug, you need these tools and equipment:

Ratcheting torque screwdriver with a Phillips head that exerts up to 15 pound-force inches (lbf-in.) or 240 ounce-force inches (ozf-in.) of pressure
Panduit crimping tool with optional controlled-cycle mechanism (model CT-700, CT-720, CT-920, CT-920CH, CT-930, or CT-940CH)
6-gauge copper ground wire (insulated or noninsulated)
Wire-stripping tool for stripping 6-gauge wires

Note The illustrations in this section show the Catalyst 3550-12T switch as an example. Follow the same procedure to install the ground lug on the Catalyst 3550-24 and 3550-24-FX switches.

To ground the switch to earth ground, follow these steps. Make sure to follow any grounding requirements at your site.

Step 1 Use the two Phillips pan-head screws to attach the RPS connector cover to the back of the switch as shown in Figure 3-16.

Step 2 If your ground wire is insulated, use a wire stripping tool to strip the 6-gauge ground wire to 0.5 inch (12.7 mm) ± 0.02 inch (0.5 mm). (See Figure C-1.)

Step 3 Slide the open end of the ground lug over the exposed area of the 6-gauge wire.

Step 4 Using a Panduit crimping tool, crimp the ground lug to the 6-gauge wire. (See Figure C-2.)

Step 5 Use the two number-10-32 screws to attach the ground lug and wire assembly to the switch rear panel RPS connector cover, as shown in Figure 3-18.

Step 6 Using a ratcheting torque screwdriver, torque each ground-lug screw to 15 lbf-in. (240 ozf-in.)

Figure 3-18 Torquing Ground-Lug Screws on the Switch

Powering the Switch and Connecting Devices

These sections describe powering the switch, connecting an RPS, connecting cables, and inserting GBICs.

Powering the Switch

Use the supplied AC power cord to connect the AC power socket on the switch rear panel to an AC power outlet.

When the switch powers on, it automatically begins POST, a series of tests that verifies that the switch functions properly. When POST completes, the system LED is green. If the switch fails POST, the system LED is amber, and the port LED associated with the particular test is amber.

If POST fails, see "Troubleshooting," to determine a course of action.

Connecting a Cisco RPS

Use the cable supplied with the RPS to connect to the switch rear panel. Connect the switch and the RPS to the same AC power source. Always put the RPS in standby mode when you connect devices to it and in active mode during normal operation.

Note Make sure to connect the switch and the RPS to the same AC power source.

You can connect the Cisco RPS 300 (model PWR300-AC-RPS-N1) to these switch models:

Catalyst 3550-12T, 3550-12G, 3550-24, 3550-FX, or 3550-48 switch. (The Cisco RPS 300 does not support the Catalyst 3550-24-DC or 3550-24PWR switch.)

Warning Attach only the Cisco RPS (model PWR300-AC-RPS-N1) to the RPS receptacle.

You can connect the Cisco RPS 675 (model PWR675-AC-RPS-N1) to these switch models.

Catalyst 3550-12T, 3550-12G, 3550-24, 3550-FX, 3550-24PWR, or 3550-48 switch. (The Cisco RPS 675 does not support the Catalyst 3550-24-DC switch.)

Warning Attach only the Cisco RPS (model PWR675-AC-RPS-N1) to the RPS receptacle.

Connecting to the 10/100 and 10/100/1000 Ports

Caution To prevent ESD damage, follow your normal board and component handling procedures when connecting to the Ethernet ports.

Use the guidelines in Table 3-1 to select the correct cable for connecting the switch 10/100 and 10/100/1000 ports to other devices. See the "Cable and Adapter Specifications" section for cable-pinout descriptions.

Table 3-1 Recommended Ethernet Cables

Device	Crossover Cable¹	Straight-Through Cable1
Switch to switch	Yes	No
Switch to hub	Yes	No
Switch to computer or server	No	Yes
Switch to router	No	Yes
Switch to IP phone	No	Yes

1 100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5 cable. 10BASE-T traffic can use Category 3 or Category 4 cable.

The switch 10/100 and 10/100/1000 port default setting is autonegotiate. If the attached device does not support autonegotiation, you can explicitly set the speed and duplex parameters. After connecting the cable, the port LED turns green when both the switch and the connected device have established a link.

Connecting to the 10/100 Inline Power Ports

You can connect the Catalyst 3550-24PWR switch to a Cisco IP Phone through a straight-through, twisted four-pair Category 5 cable. The rear panel of the Cisco IP Phone might have more than one RJ-45 connector. Use the LAN-to-phone connector to connect the IP phone to the Catalyst 3550-24PWR switch.

You can configure the 10/100 ports on the Catalyst 3550-24PWR switch to either automatically provide inline power when a Cisco IP Phone or a Cisco Aironet Access Point is connected or to never provide inline power even if an IP phone or an access point is connected. The default setting is Auto.

Caution It takes a Catalyst 3550-24PWR 10/100 port up to 10 seconds to initially detect, power up, and link to a Cisco IP Phone. If you disconnect the Cisco IP Phone before link is established, you must wait 10 seconds before connecting another network device (other than another IP phone) to that switch port. Failure to do so can result in damage to that network device.

You also can connect the Cisco IP Phone or Cisco Aironet Access Point to a Catalyst 3550-24PWR 10/100 port and to an AC power source for redundant power. The power source to which the external device is first connected becomes its primary power source, and the second power source is its backup. If the primary source fails, the second power source becomes the primary power source to the device. During the power transfer, the device might reboot or reestablish link with the switch.

For information about Cisco IP Phones and Cisco Aironet Access Points, refer to the documentation that came with your IP phone or access point.

Connecting to 100BASE-FX Ports

Caution To prevent ESD damage, follow your normal board and component handling procedures when connecting to the 100BASE-FX ports.

The 100BASE-FX ports operate only at 100 Mbps and support both full- and half-duplex mode. The half-duplex mode is the default setting. Autonegotiation is not supported.

To connect to a 100BASE-FX port, remove the rubber plug from the port and the rubber cap from the MT-RJ patch cable. Store for future use. Insert the cable in the port, and insert the other cable end in an SC or ST connector on the target device. The port LED turns green when both the switch and the connected device have established a link.

Caution Do not remove the rubber plugs from the fiber-optic ports or the rubber caps from the fiber-optic cable until you are ready to connect the cable. The plugs and caps protect the fiber-optic ports and cables from contamination and ambient light.

You can connect a 100BASE-FX port to an SC or ST connector on a compatible device by using one of the MT-RJ fiber-optic patch cables listed in Table B-1.

Installing GBIC Modules

Refer to the release notes for the latest list of approved GBIC modules and to your GBIC documentation for more information about installation, cabling, and configuring. See Related Publications for a list of related documentation.

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