Catalyst 2950 Switch Hardware Installation Guide, August 2004
Installation
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Installation

Table Of Contents

Installation

Preparing for Installation

Warnings

Installation Guidelines

Verifying Package Contents

Verifying Switch Operation

Installing the Switch

Installing the Switch in a Rack

Attaching the Brackets to the Switch

Mounting the Switch in a Rack

Attaching the Optional Cable Guide

Installing the Switch on a Table, Shelf, or Desk

Installing the Switch on a Wall

Attaching the Brackets to the Switch

Attaching the RPS Connector Cover

Mounting the Switch to a Wall

Installing the Optional AC Ground Kit for Catalyst 2950 Switches

Installing the GBIC Modules

Installing and Removing SFP Modules

Installing SFP Modules into SFP Module Slots

Removing SFP Modules from SFP Module Slots

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

Connecting to 100BASE-FX and 1000BASE-SX Ports

Connecting to an LRE Port

Connection Guidelines

Limitations and Restrictions with POTS Splitters

Required Cables

Connecting to a Patch Panel or POTS Splitter

Connecting to GBIC Module Ports

Connecting to 1000BASE-X GBIC Module Ports

Connecting to 1000BASE-T GBIC Module Ports

Connecting to GigaStack GBIC Module Ports

Connecting to SFP Modules

Connecting to Fiber-Optic SFP Modules

Connecting to 1000BASE-T SFP Modules

Where to Go Next


Installation


This chapter describes how to install your switch, interpret the power-on self-test (POST), and connect the switch to other devices. Read these topics, and perform the procedures in this order:

Preparing for Installation

Verifying Switch Operation

Installing the Switch

Installing the GBIC Modules

Installing and Removing SFP Modules

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

Connecting to 100BASE-FX and 1000BASE-SX Ports

Connecting to an LRE Port

Connecting to GBIC Module Ports

Connecting to SFP Modules

Where to Go Next

Preparing for Installation

This section provides information about these topics:

Warnings

Installation Guidelines

Verifying Package Contents

Warnings

For translations of these warnings in several languages, see the Regulatory Compliance and Safety Information for the Catalyst 2950 Switch.


Warning Attach only the Cisco Redundant Power Supply (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



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



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



Warning The plug-socket combination must be accessible at all times, because it serves as the main disconnecting device. Statement 1019


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. Statement 1006



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 This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure that the switch functional ground lug is connected to earth ground during normal use. Statement 1064



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



Warning When installing the unit, always make the ground connection first and disconnect it last. Statement 42



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



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



Warning If an RPS is not connected to the switch, install an RPS connector cover on the back of the switch. Statement 265



Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030



Warning Class 1 laser product. Statement 1008



Warning Avoid direct exposure to the laser beam. Statement 1012



Warning Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051



Warning The Catalyst 2950G-24-EI-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 121C



Warning The Catalyst 2950ST-24 LRE 997 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 121D



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 connecting or disconnecting ground or power wires to the chassis, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position. Use a voltmeter to test for 0 (zero) voltage at the power terminals on the chassis. Statement 196



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 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


Installation Guidelines

When determining where to place the switch, observe these guidelines.

Before installing the switch, first verify that the switch is operational by powering it on and running POST. Follow the procedures in the "Verifying Switch Operation" section.

For 10/100 ports and 10/100/1000 ports, the cable length from a switch to an attached device cannot exceed 328 feet (100 meters).

For 100BASE-FX ports, the cable length from a switch to an attached device cannot exceed 6562 feet (2 kilometers).

For 1000BASE-SX ports and 1000BASE-SX Gigabit Interface Converter (GBIC) module ports, the cable length from a switch to an attached device cannot exceed 1804 feet (550 meters).

For 1000BASE-LX/LH GBIC module ports, the cable length from a switch to an attached device cannot exceed 32,810 feet (10 kilometers).

For 1000BASE-ZX GBIC module ports, the cable length from a switch to an attached device cannot exceed 328,100 feet (100 kilometers).

For 1000BASE-T GBIC module ports, the cable length from a switch to an attached device cannot exceed 328 feet (100 meters).

For Coarse Wave Division Multiplexing (CWDM) GBIC module ports, the cable length from a switch to an attached device cannot exceed 393,719 feet (120 kilometers). For specific cable lengths, see the CWDM GBIC module documentation.

For GigaStack GBIC module ports, the cable length from a switch to an attached device cannot exceed 3 feet (1 meter).

For Long-Reach Ethernet (LRE) ports, cable-length specifications vary. See the "LRE Port" section.

Operating environment is within the ranges listed in "Technical Specifications."

Clearance to front and rear panels meet these conditions:

Front-panel LEDs can be easily read.

Access to ports is sufficient for unrestricted cabling.

Rear-panel AC power connector on switches other than the LRE switches is within reach of an AC power outlet.

Rear-panel direct current (DC) power connector on the Catalyst 2950G-24-EI-DC switch is within reach of a circuit breaker.

Front-panel AC power connector on the LRE switches is within reach of an AC power outlet.

Front-panel DC power connector on the Catalyst 2950ST-24 LRE 997 switch is within reach of a circuit breaker.

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.

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 materials to the shipping container and save them.


The switch is shipped with these items:

Catalyst 2950 Switch Getting Started Guide

Regulatory Compliance and Safety Information for the Catalyst 2950 Switch

AC power cord (not shipped with the Catalyst 2950G-24-EI-DC switch or the Catalyst 2950ST-24 LRE 997 switch)

Console cable

Mounting kit containing these items:

Four rubber feet for mounting the switch on a table, shelf, or desk

Two 19-inch or 24-inch rack-mounting brackets

Six number-8 Phillips flat-head screws for attaching the brackets to the switch

Four number-8 Phillips truss-head screws for attaching the brackets to the switch

Four number-12 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 and two number-4 pan-head screws

DC-switch kit containing these items:

One DC terminal block plug (also called a terminal block header)

One ground lug

Two number-10-32 screws for attaching the ground lug to the switch

Two 23-inch rack-mounting brackets (with 1-inch spacing for telco racks)

Four number-8 Phillips truss-head screws for attaching the brackets to the switch

Two number-12 Phillips machine screws for attaching the brackets to a rack


Note The DC-switch kit ships only with the Catalyst 2950G-24-EI-DC or Catalyst 2950ST-24 LRE 997 switch.


One RJ-45-to-DB-9 adapter cable

Product ownership registration card

If you want to connect a terminal to the switch console port, you need to provide an RJ-45-to-DB-25 female DTE adapter. You can order a kit (part number ACS-DSBUASYN=) with that adapter from Cisco.

Verifying Switch Operation

Before installing the switch in a rack, on a wall, or on a table or shelf, you should power on the switch and verify that the switch passes POST. See Section 3, "Running Express Setup," in the getting started guide for the steps required to connect a PC to the switch console port and to power on the switch.

While the switch powers on, it automatically begins POST, a series of tests that verifies that the switch functions properly. When the switch begins POST, the system LED is off. POST has completed successfully when the SYST and STAT LEDs are green.

If a switch fails POST, the System LED turns amber. If POST fails, see "Troubleshooting," to determine a course of action.


Note POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST.


After a successful POST, follow these steps:


Step 1 Turn off power to the switch.

Step 2 Disconnect the cables.

Step 3 Determine where you want to install the switch.


Installing the Switch

This section describes these installation procedures:

Installing the Switch in a Rack

Installing the Switch on a Table, Shelf, or Desk

Installing the Switch on a Wall

Installing the Optional AC Ground Kit for Catalyst 2950 Switches

Installing the Switch in a Rack

Use these instructions to install the switch in a rack:

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. Statement 1006



Note Figure 2-1 to Figure 2-15 show the Catalyst 2950-24, 2950G-24-EI-DC, and 2950G-48-EI switches as examples. You can install other Catalyst 2950 switches in a rack as shown in these illustrations.


To install the switch in a 19-, 23-, or 24-inch rack, follow these steps:

1. Attaching the Brackets to the Switch

2. Mounting the Switch in a Rack

3. Attaching the Optional Cable Guide


Note Installing a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI switch in a 23-inch or 24-inch rack requires an optional bracket kit not included with the switch. You can order a kit containing the 23-inch or 24-inch rack-mounting brackets and hardware from Cisco (part number RCKMNT-1RU=).


Attaching the Brackets to the Switch

The bracket orientation and the screws that you use depend on whether you are attaching the brackets to a 19-, 23-, or 24-inch rack. Follow these guidelines:

When mounting a switch other than a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI switch in a 19-inch rack, use two Phillips flat-head screws to attach the long side of the 19- or 24-inch bracket to the switch. See Figure 2-1, Figure 2-2, and Figure 2-3.

When mounting a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI switch in a 19-inch rack, use three Phillips flat-head screws to attach the long side of the 19- or 24-inch bracket to the switch. See Figure 2-4, Figure 2-5, and Figure 2-6.

When mounting a Catalyst 2950G-24-EI-DC or Catalyst 2950ST-24 LRE 997 switch in a 23-inch rack, use two Phillips truss-head screws to attach the 23-inch bracket to the switch. See Figure 2-7, Figure 2-8, and Figure 2-9.

When mounting a switch other than a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI switch in a 24-inch rack, use two Phillips truss-head screws to attach the 19- or 24-inch bracket to the switch. See Figure 2-10, Figure 2-11, and Figure 2-12.

When mounting a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI switch in a 24-inch rack, use three Phillips flat-head screws to attach the 24-inch bracket (part number RCKMNT-1RU=) to the switch. See Figure 2-13, Figure 2-14, and Figure 2-15.

Figure 2-1 to Figure 2-15 show how to attach a bracket to one side of the switch. Follow the same steps to attach the second bracket to the opposite side of the switch.

Figure 2-1 Attaching Brackets on the Switch in a 19-Inch Rack (Front Panel Forward)

Figure 2-2 Attaching Brackets on the Switch in a 19-Inch Rack (Rear Panel Forward)

Figure 2-3 Attaching Brackets on the Switch in a 19-Inch Telco Rack

Figure 2-4 Attaching Brackets on a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI Switch in a 19-Inch Rack (Front Panel Forward)

Figure 2-5 Attaching Brackets on a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI Switch in a 19-Inch Rack (Rear Panel Forward)

Figure 2-6 Attaching Brackets on a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI Switch in a 19-Inch Telco Rack

Figure 2-7 Attaching Brackets on the Catalyst 2950G-24-EI-DC or 2950ST-24 LRE 997 Switch in a 23-Inch Telco Rack (Front Panel Forward)

Figure 2-8 Attaching Brackets on the Catalyst 2950G-24-EI-DC or 2950ST-24 LRE 997 Switch in a 23-Inch Telco Rack (Rear Panel Forward)

Figure 2-9 Attaching Brackets on the Catalyst 2950G-24-EI-DC or 2950ST-24 LRE 997 Switch in a 23-Inch Telco Rack

Figure 2-10 Attaching Brackets on the Switch in a 24-Inch Rack (Front Panel Forward)

Figure 2-11 Attaching Brackets on the Switch in a 24-Inch Rack (Rear Panel Forward)

Figure 2-12 Attaching Brackets on the Switch in a 24-Inch Telco Rack

Figure 2-13 Attaching Brackets on a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI Switch in a 24-Inch Rack (Front Panel Forward)

Figure 2-14 Attaching Brackets on a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI Switch in a 24-Inch Rack (Rear Panel Forward)

Figure 2-15 Attaching Brackets on a Catalyst 2950G-48-EI, Catalyst 2950SX-48-SI, or Catalyst 2950T-48-SI Switch in a 24-Inch Telco Rack

Mounting the Switch in a Rack

After attaching the brackets, use the four Phillips machine screws to securely attach the brackets to the rack, as shown in Figure 2-16.

When installing a switch other than an LRE switch, to prevent the cables from obscuring the switch and other devices in the rack, you can also attach the cable guide to the rack. See the"Attaching the Optional Cable Guide" section for instructions.

Figure 2-16 Mounting the Switch in a Rack

After mounting the switch in the rack, start the terminal-emulation software, and provide power to the switch. See the getting started guide for instructions.

Attaching the Optional Cable Guide

We recommend attaching the cable guide to prevent the cables from obscuring the front panels of the switch and other devices installed in the rack. Use the supplied black Phillips machine screw to attach the cable guide to the left or right bracket, as shown in Figure 2-17.


Note You cannot use the cable guide with Catalyst 2950 LRE switches.


Figure 2-17 Attaching the Cable Guide

Installing the Switch on a Table, Shelf, or Desk

Before placing the switch on a table, shelf, or desk, locate the adhesive strip with rubber feet in the mounting-kit envelope, and attach four rubber feet to the recessed areas on the switch bottom. Place the switch on a table, shelf, or desk near an AC power source or DC-input power source.

Start the terminal-emulation software and provide power to the switch. See the getting started guide for instructions.

Installing the Switch on a Wall


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



Warning If an RPS is not connected to the switch, install an RPS connector cover on the back of the switch. Statement 265


You can mount the Catalyst 2950 switch to a wall in a face-up configuration. To attach the switch to a wall, follow the procedures in this section.

1. Attaching the Brackets to the Switch

2. Attaching the RPS Connector Cover

3. Mounting the Switch to a Wall

Attaching the Brackets to the Switch

Use the supplied Phillips flat-head screws to attach a bracket to the switch. Figure 2-18 shows how to attach the bracket to one side of the switch. Follow the same steps to attach the second bracket to the opposite side of the switch.

Figure 2-18 Attaching Brackets for Wall-Mounting for the Catalyst 2950 Switch

Attaching the RPS Connector Cover

If you are not using an RPS with your switch, use two number-4 Phillips pan-head screws to install an RPS connector cover to the back of the switch. (See Figure 2-19.) The pan-head screws are included in the accessory kit.


Warning If an RPS is not connected to the switch, install an RPS connector cover on the back of the switch. Statement 265


Figure 2-19 Attaching the RPS Connector Cover

Mounting the Switch to a Wall


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


For the best support of the switch and cables, make sure the switch is attached securely to a wall stud or to a firmly attached plywood mounting backboard, as shown in Figure 2-20.

Figure 2-20 Mounting a Catalyst 2950 Switch to a Wall

After the switch is mounted on the wall, power the switch as described in getting started guide.

Installing the Optional AC Ground Kit for Catalyst 2950 Switches

For switches that require a two-hole lug for grounding, you can order a kit containing the ground lug and hardware (Cisco 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

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 2-21.

Figure 2-21 Attaching the RPS Connector Cover

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), as shown in Figure 2-22.

Figure 2-22 Stripping the Ground Wire

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, as shown in Figure 2-23.

Figure 2-23 Crimping the Ground Lug

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 2-24.

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

Figure 2-24 Torquing Ground-Lug Screws


Installing the GBIC Modules

Figure 2-25, Figure 2-26, and Figure 2-27 show how to insert a GBIC module in a GBIC module slot on the switch. For instructions on how to install a CWDM GBIC module in a GBIC module slot, see the documentation that came with that GBIC module.

For detailed instructions on installing, removing, and cabling the GBIC module (the 1000BASE-X module, the 1000BASE-T module, the CWDM GBIC module, or the GigaStack module), refer to your GBIC documentation.


Caution To prevent electrostatic-discharge (ESD) damage when installing GBIC modules, follow your normal board and component handling procedures.

Figure 2-25 Installing a 1000BASE-X GBIC Module in a Switch 

Figure 2-26 Installing a 1000BASE-T GBIC Module in a Switch

Figure 2-27 Installing a GigaStack GBIC Module in a Switch

Installing and Removing SFP Modules

These sections describe how to install and remove small-form-factor pluggable (SFP) modules. SFP modules are inserted into SFP module slots on the front of the Catalyst 2950 LRE switches. These field-replaceable modules provide the uplink interfaces.

You can use any combination of SFP modules. See the Catalyst 2950 LRE release notes for the list of SFP modules that the Catalyst 2950 LRE switch supports. Each port must match the wave-length specifications on the other end of the cable, and for reliable communications, the cable must not exceed the stipulated cable length. Refer to Table 1-2 for cable stipulations for SFP module connections.

Use only Cisco SFP modules on the Catalyst 2950 LRE switch. Each SFP module has an internal serial EEPROM that is encoded with security information. This encoding provides a way for Cisco to identify and validate that the SFP module meets the requirements for the switch.

For detailed instructions on installing, removing, and cabling the SFP module, refer to your SFP module documentation.

Installing SFP Modules into SFP Module Slots

SFP modules use different types of latches for their installation and extraction. Determine which type of latch your SFP module uses before following the installation procedure:

Figure 2-28 shows an SFP module with a Mylar tab latch.

Figure 2-29 shows an SFP module with an actuator button latch.

Figure 2-30 shows an SFP module that has a bale-clasp latch.


Caution We strongly recommend that you do not install or remove the SFP module with fiber-optic cables attached to it because of the potential damage to the cables, the cable connector, or the optical interfaces in the SFP module. Disconnect all cables before removing or installing an SFP module.

Removing and installing an SFP module can shorten its useful life. Do not remove and insert SFP modules more often than is absolutely necessary.

Figure 2-28 SFP Module with a Mylar Tab Latch

Figure 2-29 SFP Module with an Actuator Button Latch

Figure 2-30 SFP Module with a Bale-Clasp Latch

To insert an SFP module into the SFP module slot, follow these steps:


Step 1 Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis.

Step 2 Find the send (TX) and receive (RX) markings that identify the top side of the SFP module.


Note On some SFP modules, the send and receive (TX and RX) markings might be replaced by arrows that show the direction of the connection, either send or receive (TX or RX).


Step 3 Align the SFP module in front of the slot opening.

Step 4 Insert the SFP module into the slot until you feel the connector on the module snap into place in the rear of the slot.

Figure 2-31 Installing an SFP Module into an SFP Module Slot

Step 5 For fiber-optic SFP modules, remove the dust plugs from the SFP module optical ports and store them for later use.


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

Step 6 Insert the cable connector into the SFP module:

For fiber-optic SFP modules, insert the LC or MT-RJ cable connector into the SFP module.

For copper SFP modules, insert the RJ-45 cable connector into the SFP module.


Note When connecting to 1000BASE-T SFP modules, be sure to use a twisted four-pair, Category 5 cable.



Removing SFP Modules from SFP Module Slots

To remove an SFP module from a module receptacle, follow these steps:


Step 1 Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis.

Step 2 Disconnect the LC from the SFP module.


Tip For reattachment, note which cable connector plug is send (TX) and which is receive (RX).


Step 3 For fiber-optic SFP modules, insert a dust plug into the optical ports of the SFP module to keep the optical interfaces clean.

Step 4 Unlock and remove the SFP module, as shown in Figure 2-32, Figure 2-33, and Figure 2-34.

If the module has a Mylar tab latch, pull the tab straight out so that you remove the SFP module from the port in a parallel direction. Do not twist or pull the tab because you could disconnect it from the SFP module.

Figure 2-32 Using the Mylar Tab Latch to Remove an SFP Module from a Slot

If the module has an actuator button latch, use your thumb to push inward on the wedge to free the locking pin, and use your index finger to grip the ridge on top of the SFP module. Pull straight out to remove the module.

Figure 2-33 Using the Actuator Button Latch to Remove an SFP Module from an SFP Module Slot

If the module has a bale-clasp latch, pull the bale out and down to eject the module. If the bale-clasp latch is obstructed and you cannot use your index finger to open it, use a small, flat-blade screwdriver or other long, narrow instrument to open the bale-clasp latch.

Figure 2-34 Removing a Bale-Clasp Latch SFP Module by Using a Flat-Blade Screwdriver

Step 5 Grasp the SFP module between your thumb and index finger, and carefully remove it from the module slot.

Step 6 Place the removed SFP module in an antistatic bag or other protective environment.


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

The 10/100 ports configure themselves to operate at the speed and duplex settings of attached devices.They operate at 10 or 100 Mbps in half- or full-duplex mode. If the attached devices do not support autonegotiation, you can explicitly set the speed and duplex parameters.

The 10/100/1000 ports configure themselves to operate at the speed setting of attached devices. These ports on Catalyst 2950T-24 switches operate at 10, 100, or 1000 Mbps in full-duplex mode. The 10/100/1000 ports on Catalyst 2950 LRE and Catalyst 2950T-48-SI switches operate at 10 or 100 Mbps in either half- or full-duplex mode and at 1000 Mbps only in full-duplex mode. If the attached devices do not support autonegotiation, you can set the speed.


Note On the Catalyst 2950 LRE switches, the four input uplink ports are bundled as two logical ports, each consisting of a copper 10/100/1000 port and a fiber-optic SFP module slot, respectively.

Within each logical port, you can use only the copper or the fiber-optic port at one time. If the Catalyst 2950 LRE switch senses more than two connections for both logical ports, by default, the switch chooses the fiber-optic connections over the copper connections.

See the "SFP Module Slots" section for more information on LRE uplink logical ports.


Connecting devices that do not autonegotiate or devices with manually set speed and duplex parameters can reduce performance or result in link failures between the devices. To maximize performance, choose one of these methods for configuring the ports:

Let the 10/100 ports autonegotiate both speed and duplex, let the 10/100/1000 ports on the LRE switches autonegotiate both speed and duplex, and let
the 10/100/1000 ports on the Catalyst 2950G-24-EI-DC switch only autonegotiate speed.

Set the speed and duplex parameters on both ends of the connection.

When connecting the ports on the Catalyst 2950G-24-EI-DC and Catalyst 2950ST-24 LRE 997 switches to other devices, follow these guidelines:


Caution To comply with the intrabuilding lightning surge requirements, intrabuilding wiring must be shielded, and the shield for the wiring must be grounded at both ends.


Caution The Catalyst 2950G-24-EI-DC or Catalyst 2950ST-24 LRE 997 switch is suitable only for intrabuilding or nonexposed wiring connections.

Follow these steps to connect the switch to 10BASE-T, 100BASE-TX, or 1000BASE-T devices:


Caution To prevent electrostatic-discharge (ESD) damage, follow your normal board and component handling procedures.


Step 1 When connecting to servers, workstations, and routers, insert a twisted-pair straight-through cable in a front-panel RJ-45 connector. Figure 2-35 shows the Catalyst 2950-12, 2950-24, 2950C-24, 2950SX-24, and 2950T-24 switch as an example. When connecting to switches or repeaters, insert a twisted-pair crossover cable. (See the "Cable and Adapter Specifications" section for cable-pinout descriptions.)


Note When connecting to 1000BASE-T devices, be sure to use a four twisted-pair, Category 5 cable.


Figure 2-35 Connecting to a Port on Catalyst 2950-12, 2950-24, 2950C-24, 2950SX-24, and 2950T-24 Switches

Step 2 Insert the other cable end in an RJ-45 connector on the target device.

Step 3 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while Spanning Tree Protocol (STP) discovers the network topology and searches for loops. This process takes about 30 seconds, and then the LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be a problem with the adapter installed in the target device. See "Troubleshooting," for solutions to cabling problems.

Step 4 Reconfigure and restart the target device if necessary.

Step 5 Repeat Steps 1 through 4 to connect each port.


Connecting to 100BASE-FX and 1000BASE-SX Ports

The 100BASE-FX and 1000BASE-SX ports operate only in full-duplex mode.

You can connect a 100BASE-FX or 1000BASE-SX port to an SC or ST port on a target device by using one of the MT-RJ fiber-optic patch cables listed in Table 2-1. Use the Cisco part numbers in Table 2-1 to order the patch cables that you need.

Table 2-1 MT-RJ Patch Cables for 100BASE-FX and 1000BASE-SX Connections

Type
Cisco Part Number

1-meter, MT-RJ-to-SC multimode cable

CAB-MTRJ-SC-MM-1M

3-meter, MT-RJ-to-SC multimode cable

CAB-MTRJ-SC-MM-3M

5-meter, MT-RJ-to-SC multimode cable

CAB-MTRJ-SC-MM-5M

1-meter, MT-RJ-to-ST multimode cable

CAB-MTRJ-ST-MM-1M

3-meter, MT-RJ-to-ST multimode cable

CAB-MTRJ-ST-MM-3M

5-meter, MT-RJ-to-ST multimode cable

CAB-MTRJ-ST-MM-5M



Caution Do not remove the dust 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.

Follow these steps to connect the switch to a 100BASE-FX or 1000BASE-SX device:


Step 1 Remove the dust plugs from the 100BASE-FX or 1000BASE-SX port and the rubber caps from the MT-RJ patch cable. Store them for future use.

Step 2 Insert the cable in a 100BASE-FX or 1000BASE-SX port. (See Figure 2-36.)

Figure 2-36 Connecting to a 100BASE-FX or 1000BASE-SX Port

Step 3 Insert the other cable end in an SC or ST port on the target device.

Step 4 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be a problem with the adapter installed in the target device. See "Troubleshooting," for solutions to cabling problems.

Step 5 Reconfigure and restart the target device if necessary.

Step 6 Repeat Steps 1 through 5 to connect each port.


Connecting to an LRE Port

Depending on the switch model, you can connect the LRE port to up to 8 or up to 24 LRE customer premises equipment (CPE) devices through a patch panel. For information about which LRE CPE devices are supported by the LRE switches, see Table 1-1.


Note You can connect both Cisco 575 LRE CPE and Cisco 585 LRE CPE devices to your Catalyst 2950ST-8 LRE or Catalyst 2950ST-24 LRE switch.

You can connect only the Cisco 576 LRE CPE 997 device to LRE ports on a Catalyst 2950ST-24 LRE 997 switch.

You can hot swap the CPE devices without powering down the switch or disrupting the other switch ports.


Connection Guidelines

If telephone services, such as voice or Integrated Services Digital Network (ISDN), use the same cabling as the LRE traffic, you must connect the LRE to a plain old telephone service (POTS) splitter. The splitter routes LRE data (high-frequency) and voice (low-frequency) traffic from the telephone line to the switch and private branch exchange (PBX) switch or public switched telephone network (PSTN).

If the other telephone services are connected through a PBX switch, you can use a Cisco LRE 48 POTS Splitter. The PBX routes voice traffic to private telephone networks and the PSTN. For more information about the Cisco LRE 48 POTS Splitter (PS-1M-LRE-48), see the Installation and Warranty Notes for the Cisco LRE 48 POTS Splitter.

If the installation does not have a PBX, you need to use a homologated POTS splitter to connect to the PSTN. For more information about homologated POTS splitters, contact your Cisco sales representative.

If a connection to a telephone network is not required, you do not need a splitter, and you can connect the switch to the patch panel.

Limitations and Restrictions with POTS Splitters

These limitations and restrictions apply when you use a POTS splitter with Catalyst 2950 LRE switches and Cisco LRE CPE devices:

The Catalyst 2950ST-8 LRE switch, Catalyst 2950ST-24 LRE switch, Cisco 575 LRE CPE, and Cisco 585 LRE CPE are designed to share lines with analog, ISDN, and digital PBX switch telephones that use the 0 to 700 kHz frequency range.

Digital telephones connected to digital PBX switches that use frequencies above 700 kHz do not work when sharing a line with LRE signals. Due to the proprietary nature of digital PBX switches, some digital PBX switch services use frequencies above 700 kHz.

You can use a Cisco LRE 48 POTS Splitter with a Catalyst 2950ST-8 LRE switch, Catalyst 2950ST-24 LRE switch, Cisco 575 LRE CPE, and Cisco 585 LRE CPE. For installation instructions, see the Installation and Warranty Notes for the Cisco LRE 48 POTS Splitter.

The Catalyst 2950ST-24 LRE 997 switch and Cisco 576 LRE 997 CPE are designed to share lines with analog and ISDN telephones that use the 0
to 120 kHz frequency range.

We recommend that you do not use a Cisco LRE 48 POTS Splitter with a Catalyst 2950ST-24 LRE 997 switch and a Cisco 576 LRE 997 CPE as shown in Figure 2-37. Only traffic in a specific frequency range can be sent to and from the devices attached to the CPE.

In Figure 2-37, only traffic from 0 to 120 kHz can pass from a device attached to the CPE, such as a computer or telephone, to the CPE, a splitter, and a switch. In the reverse direction, traffic from 0 to 700 kHz can pass through the switch and splitter to the CPE, but only traffic from 0 to 120 kHz can pass through the CPE to a computer or a telephone.

For more information, see the Installation and Warranty Notes for the Cisco LRE 48 POTS Splitter.

Figure 2-37 Limitations Using a Cisco LRE 48 POTS Splitter with a Catalyst 2950ST-24 LRE 997 Switch and a Cisco 576 LRE 997 CPE

Required Cables

Connecting the LRE port to a patch panel or a POTS splitter requires a male-to-male RJ-21 cable, Category 3 or above. You can order RJ-21 cables from your cable vendor, or you can order these cables from your Cisco sales representative:

CAB-5-M120M120-5= (Category 5 cable with 90-degree, male-to-male RJ-21 connectors)

CAB-5-M180M120-5= (Category 5 cable with 120-degree, male-to-male RJ-21 connectors)

The screws that you need to secure the cable to the switch are shipped with the cable. Contact your Cisco sales representative for more information.

Connecting to a Patch Panel or POTS Splitter

To connect the LRE port to a patch panel or POTS splitter, follow these steps:


Step 1 Connect one end of a cable connected to the wiring trunk to the RJ-21 connector (the LRE port) on the switch. (See Figure 2-38 and Figure 2-39.)

Step 2 Referring to Figure 2-38 and Figure 2-39, secure the cable to the switch:

For a 90-degree connector, see the top of Figure 2-38 and Figure 2-39.

For a 12-degree connector, see the bottom of Figure 2-38 and Figure 2-39.


Note The cable tie is not included with the connector and cable assembly.


Step 3 Connect the other end of the cable to the patch panel or POTS splitter.


Figure 2-38 Connecting to an LRE Port on a Catalyst 2950ST-8 LRE or 2950ST-24 LRE Switch

Figure 2-39 Connecting to an LRE Port on a Catalyst 2950ST-24 LRE 997 Switch

Each LRE port status LED turns on when it establishes a link with a Cisco LRE CPE device. For more information about the LRE link between the switch LRE port and the CPE and about the configuration and management of CPE devices, see the switch software configuration guide.

For more information about the Cisco LRE CPE devices, see the Cisco LRE CPE Hardware Installation Guide.

Connecting to GBIC Module Ports

These sections describe how to connect to a GBIC module port.

Connecting to 1000BASE-X GBIC Module Ports

Connecting to 1000BASE-T GBIC Module Ports

Connecting to GigaStack GBIC Module Ports

For instructions about how to connect to the CWDM GBIC module ports, see the documentation that came with that GBIC module.

For detailed instructions about installing, removing, and connecting to the GBIC module (the 1000BASE-X module, the 1000BASE-T module, the CWDM GBIC module, or the GigaStack module), see the GBIC module documentation.

When connecting the ports on the Catalyst 2950G-24-EI-DC and Catalyst 2950ST-24 LRE 997 switches to other devices, follow these guidelines:


Caution To comply with the intrabuilding lightning surge requirements, intrabuilding wiring must be shielded, and the shield for the wiring must be grounded at both ends.


Caution The Catalyst 2950G-24-EI-DC or Catalyst 2950ST-24 LRE 997 switch is suitable only for intrabuilding or nonexposed wiring connections.

Connecting to 1000BASE-X GBIC Module Ports


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

After installing the 1000BASE-X GBIC in the GBIC module slot, follow these steps:


Step 1 Remove the rubber plugs from the GBIC module port, and store them for future use.

Step 2 Insert the SC connector in the fiber-optic receptacle (see Figure 2-40).

Figure 2-40 Connecting to a 1000 BASE-X GBIC Port

Step 3 Insert the other cable end in a fiber-optic receptacle on a target device.

Step 4 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be problem with the adapter installed in the target device. See Chapter 3, "Troubleshooting," for solutions to cabling problems.

Step 5 Reconfigure and restart the switch or target device if necessary.


Connecting to 1000BASE-T GBIC Module Ports

After installing the 1000BASE-T GBIC in the GBIC module slot, follow these steps:


Caution To prevent ESD damage, follow your normal board and component handling procedures.


Step 1 When connecting to servers, workstations, and routers, insert a four twisted-pair, straight-through cable in the RJ-45 connector. When connecting to switches or repeaters, insert a four twisted-pair, crossover cable (see Figure 2-41).


Note When connecting to a 1000BASE-T device, be sure to use a four twisted-pair, Category 5 cable.


Figure 2-41 Connecting to a 1000BASE-T GBIC Port

Step 2 Insert the other cable end in an RJ-45 connector on a target device.

Step 3 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be a problem with the adapter installed in the target device. See Chapter 3, "Troubleshooting," for solutions to cabling problems.

Step 4 Reconfigure and restart the switch or target device, if necessary.


Connecting to GigaStack GBIC Module Ports

After installing the GigaStack GBIC in the GBIC module slot, follow these steps:


Step 1 Insert the GigaStack cable connector in the GBIC (see Figure 2-42).

Figure 2-42 Connecting to a GigaStack GBIC Port

Step 2 Insert the other cable end in a port on a target device.

Step 3 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be a problem with the adapter installed in the target device. See "Troubleshooting," for solutions to cabling problems.

Step 4 Reconfigure and restart the switch or target device, if necessary.


Connecting to SFP Modules

This section describes how to connect to SFP modules. For instructions on how to connect to fiber-optic SFP modules, see the "Connecting to Fiber-Optic SFP Modules" section. For instructions on how to connect to copper 1000BASE-T SFP modules, see the "Connecting to 1000BASE-T SFP Modules" section.

For instructions about how to install or remove an SFP module, see the "Installing and Removing SFP Modules" section.


Note See the Catalyst 2950 LRE release notes for the list of supported SFP modules.


Connecting to Fiber-Optic SFP Modules

Follow these steps to connect a fiber-optic cable to an SFP module:


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

Before connecting to the SFP module, be sure that you understand the port and cabling stipulations in the "Installation Guidelines" section and in the "SFP Module Slots" section. See "Connectors and Cables," for information about the LC connector on fiber-optic SFP modules.


Step 1 Remove the rubber plugs from the module port and fiber-optic cable, and store them for future use.

Step 2 Insert one end of the fiber-optic cable into the SFP module port (see Figure 2-43).

Step 3 Insert the other cable end into a fiber-optic connector on a target device.

Step 4 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while the STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be problem with the adapter installed in the target device. See "Troubleshooting," for solutions to cabling problems.

Figure 2-43 Connecting to a Fiber-Optic SFP Module Port

Step 5 If necessary, reconfigure and restart the switch or target device.


Connecting to 1000BASE-T SFP Modules

Follow these steps to connect a Category 5 cable to a 1000BASE-T SFP module:


Caution To prevent ESD damage, follow your normal board and component handling procedures.


Step 1 When connecting to servers, workstations, and routers, insert a four twisted-pair, straight-through cable in the RJ-45 connector. When connecting to switches or repeaters, insert a four twisted-pair, crossover cable.


Note When connecting to a 1000BASE-T device, be sure to use a four twisted-pair, Category 5 cable.


Figure 2-44 Connecting to a 1000BASE-T SFP Module

Step 2 Insert the other cable end in an RJ-45 connector on a target device.

Step 3 Observe the port status LED.

The LED turns green when the switch and the target device have an established link.

The LED turns amber while the STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be problem with the adapter installed in the target device. See "Troubleshooting," for solutions to cabling problems.

Step 4 If necessary, reconfigure and restart the switch or target device.


Where to Go Next

For information about starting up the switch, see the Catalyst 2950 Switch Getting Started Guide.

If the default configuration is satisfactory, the switch does not need further configuration. You can use any of these management options to change the default configuration:

Start the device manager, which is in the switch memory, to manage individual and standalone switches. This is an easy-to-use web interface that offers quick configuration and monitoring. You can access the device manager from anywhere in your network through a web browser. For more information, see the device manager online help.

Start the Network Assistant application, which is described in the Getting Started with Cisco Network Assistant guide. Through this GUI, you can configure and monitor a switch cluster or an individual switch.

Use the CLI from the console to configure the switch as a member of a cluster or as an individual switch. See the Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide and the Catalyst 2950 and Catalyst 2955 Switch Command Reference on Cisco.com for more information.

For setup instructions that use the CLI, go to "Configuring the Switch with the CLI-Based Setup Program."

Start an SNMP application such as the CiscoView application.

For information about configuring the switch, see the switch software configuration guide.