Table of Contents

Safety Recommendations

Safety with Electricity
Preventing Electrostatic Discharge Damage

Site Requirements

Plant Wiring

Interference Considerations
Distance Limitations

Preventive Site Configuration

General Precautions

Preparing Network Connections

ATM Connection Equipment
CES E1 PAM (BNC) - Special Considerations

E1 Receive (RX) Port Capacitor Clips

Unpacking the System
Repacking the System

Preparing for Installation

This chapter describes the equipment and site requirements for installing the LightStream  1010 Asynchronous Transfer Mode (ATM) switch carrier modules (CMs), and port adapter modules (PAMs). It includes requirements for power and cabling that must be in place at the installation site and describes additional equipment you will need to complete the installation and establish environmental conditions your site must meet to maintain normal operation. Instructions for unpacking the system and additional equipment are provided in the document Unpacking Instructions, which is attached to the outside of the shipping container.

This chapter includes information about the following preinstallation requirements:

• Safety Recommendations

  • Safety with Electricity

  • Preventing Electrostatic Discharge Damage

• Site Requirements

  • Plant Wiring (Interference Considerations and Distance Limitations)

  • Preventive Site Configuration

• Unpacking the System

• Repacking the System

• Preparing Network Connections

  • ATM Connection Equipment

• Unpacking the System

• Repacking the System

Warning Read the installation instructions before you connect the system to its power source. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

Warning Only trained and qualified personnel should be allowed to install or replace this equipment. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

Safety Recommendations

The following guidelines will help to ensure your safety and protect the equipment. This list is not inclusive of all potentially hazardous situations that you may be exposed to as you install the switch, so be alert.

• Never try to lift the chassis by yourself; two people are required to lift the switch.

• Always turn all power supplies off (the position marker zero) and unplug all power cords before removing the chassis front panel.

• Always unplug all power cords before installing or removing a chassis.

• Keep the chassis area clear and free of dust during and after installation.

• Keep tools and chassis components away from walk areas.

• Do not wear loose clothing, jewelry (including rings and chains), or other items that could get caught in the chassis. Fasten your tie or scarf and sleeves.

Warning Metal objects heat up when connected to power and ground, and can cause serious burns. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

Warning Before working on a system that has an on/off switch, turn OFF the power and unplug the power cord. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

Warning This unit might have more than one power cord. To reduce the risk of electric shock, disconnect the two power-supply cords before servicing the unit. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

Safety with Electricity

The CMs, PAMs, and redundant (second) power supplies are designed to be removed and replaced while the system is operating without presenting an electrical hazard or causing damage to the system. Before removing a redundant power supply, ensure that the first supply is powered on and that the power supply being removed is powered off. However, you must shut down the system before removing or replacing the ASP. Never install equipment that appears to be damaged.

• Before beginning any procedures requiring access to the chassis interior, locate the emergency power-off switch for the room in which you are working.

• Disconnect all power and external cables before installing or removing a chassis.

• Do not work alone when potentially hazardous conditions exist.

• Never assume that power has been disconnected from a circuit; always check.

• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.

• Carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.

In addition, use the guidelines that follow when working with any equipment that is disconnected from a power source but still connected to telephone wiring or other network cabling.

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

• Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.

• Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.

• Use caution when installing or modifying telephone lines.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are improperly handled, can result in complete or intermittent failures. The ASP and PAMs each consist of a printed circuit card that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding and connectors are integral components of the carrier. Although the metal carrier helps to protect the cards from ESD, use a preventive antistatic strap whenever you handle the ASP or PAMs. Handle the carriers by the carrier edges only; never touch the cards or connector pins.

Caution Always tighten the captive installation screws on the ASP and PAMs when you are installing them. These screws prevent accidental removal of the ASP, CMs, and PAMs, provide proper grounding for the system, and help to ensure that the bus connectors are properly seated in the backplane.

Following are guidelines for preventing ESD damage:

• Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact.

• Handle carriers by the faceplates and carrier edges only; avoid touching the card or any connector pins.

• When removing any module, connect the equipment end of the strap to one of the captive installation screws on an installed PAM or power supply. (See Figure 2-1.)

• When removing a module, place the removed module component-side-up on an antistatic surface or in a static shielding bag. If the module will be returned to the factory, immediately place it in a static shielding bag.

• Avoid contact between the modules and clothing. The wrist strap protects only the card from ESD voltages on the body; ESD voltages on clothing can still cause damage.

Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohms (Mohms).

Site Requirements

This section discusses the site environment requirements for the switch interface connections.

Plant Wiring

Following are guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new system, consider the distance limitations for signaling, EMI, and connector compatibility.

Interference Considerations

When wires are run for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires. This fact has two implications for the construction of plant wiring:

• Bad plant wiring can result in radio frequency interference (RFI).

• Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the switch, and can even create an electrical hazard by conducting power surges through lines and into equipment. (Review the safety warnings in the section "Safety with Electricity" earlier in this chapter.)

If wires exceed recommended distances, or if wires pass between buildings, give special consideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse (EMP) caused by lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices. If you have had problems of this sort in the past, you may want to consult experts in electrical surge suppression and shielding.

Most data centers cannot resolve the infrequent but potentially catastrophic problems just described without pulse meters and other special equipment. These problems can cost a great deal of time to identify and resolve, so take precautions by providing a properly grounded and shielded environment, paying special attention to issues of electrical surge suppression.

Distance Limitations

The length of your networks and the distances between connections depend on the type of signal, the signal speed, and the transmission media (the type of cabling used to transmit the signals). For example, fiber-optic cable has a greater channel capacity than twisted-pair cabling.

ATM Connections

Networking standards set recommended maximum distances between stations using fiber-optic and UTP cable. The recommended maximum cable lengths are listed in Table 2-1.

Table 2-1 provides guidelines for planning maximum cable spans. For detailed calculations of dispersion and power budget limits, refer to the, Technician's Guide to Fiber Optics, written by D. Sterling, published by Delmar Publishers, 1993.

For Further Reference

The following publications contain information on determining attenuation and power budget:

• T1E1.2/92-020R2 ANSI, the Draft American National Standard for Telecommunications entitled "Broadband ISDN Customer Installation Interfaces: Physical Layer Specification."

• Power Margin Analysis, AT&T Technical Note, TN89-004LWP, May 1989.

Preventive Site Configuration

Planning a proper location for the switch and the layout of your equipment rack or wiring closet is essential for successful system operation. Equipment placed too close together or inadequately ventilated can cause system overtemperature conditions. In addition, chassis panels made inaccessible by poor equipment placement can make system maintenance difficult. Following are precautions that can help avoid problems during installation and ongoing operation.

General Precautions

Follow these general precautions when planning your equipment locations and connections:

• The environmental monitor continuously checks the interior chassis environment and provides warnings for high temperature and reports any occurrences. If warning messages are displayed, take immediate action to identify the cause and correct the problem. Use the show system command regularly to check the internal system status. (Refer to the section "Environmental Monitoring and Reporting Functions" in the chapter "What is the LightStream 1010 ATM Switch" in the LightStream 1010 ATM Switch Hardware Installation Guide.)

• Keep the front of the chassis free from obstructions and away from the exhaust air of other equipment. Remember that electrical equipment generates heat, and ambient room temperature alone may not be adequate to cool equipment to acceptable operating temperatures.

• Follow ESD prevention procedures to avoid damage to equipment. Damage from static discharge can cause immediate or intermittent equipment failure.

• Ensure that the chassis panels, PAMs, and any PAM slot fillers are in place and secure. The fan assembly directs cooling air across the PAMs and forces it out between the PAM faceplates; a loose panel allows too much air to escape and can redirect the airflow away from active PAMs.

Preparing Network Connections

When preparing your site for network connections to the switch, you need to consider numerous factors related to each type of interface:

• Type of cabling required for each type (fiber-optic, coaxial, or twisted-pair cabling)

• Distance limitations for each signal type

• Specific cables you need to connect each interface

• Any additional interface equipment you need, such as transceivers, modems, channel service units (CSUs), or data service units (DSUs). Before installing the switch, have all additional external equipment and cables on hand. If you intend to build your own cables, refer to the cable pinouts in the chapter "Installing the LightStream 1010 ATM Switch PAMs." For ordering information, contact a customer service representative.

• You need NT1 device for T1 and E1 connections if not provided by your service provider

• You need NT1 device for DS-3 and E3 connections if not provided by your service provider

ATM Connection Equipment

All ATM interfaces are full duplex. You must use the appropriate ATM interface cable to connect the ATM MM, SM, or UTP PAM with an external ATM network.

For fiber-optic traffic over MM, SM, SM extended-reach, SM long-reach use the SC-type connector to connect the 155 and 622 PAMs with the external connection.

Warning Invisible laser radiation may be emitted from the aperture ports of the SM Fiber Distributed Data Interface (FDDI) card when no cable is connected. Avoid exposure and do not stare into open apertures. To see translated versions of this warning, refer to the appendix "Translated Safety Warnings" in either the LightStream 1010 ATM Switch Hardware Installation Guide or the Catalyst 5500 Installation Guide.

The fiber-optic connector (SC-type) is shown in Figure 2-2.

For UTP traffic, use the RJ-45 connector (Figure 2-3) to connect the PAMs with the external ATM switch.

Table B-1, in the appendix "PAM Cabling Specifications," lists the signals for the 155-UTP PAM RJ-45 connector.

For T1and E1 or T1 and E1 CES PAMs, use the RJ-48c connector (Figure 2-3) to connect the PAMs with the external network.

Table B-2, in the appendix "PAM Cabling Specifications," lists the signals for the RJ-48c T1, E1, CS t1, and CES E1 connectors.

For DS-3, E3, E1, and CES E1 connections, use the 75- and 120-ohm (120-ohm in the RJ cables) RG-59 coaxial cable (Figure 2-4), which has bayonet-style, twist-lock (BNC) connectors to connect the E1, DS-3, and E3 PAM with the external ATM switch.

CES E1 PAM (BNC) - Special Considerations

As a user of the BNC version of the CES E1 PAM, you have the option to take certain steps that will help you to:

• Maintain the grounding integrity of BNC cabling

• Reduce circuit susceptibility to radiated EMI

• Reduce EMI radiated from the board

The following sections describe the actions you can take to promote these benefits.

E1 Receive (RX) Port Capacitor Clips

A device called a capacitor clip is available for use with a CES E1 (BNC) PAM that is designed to reduce the emissions radiated from the four receive (RX) ports on this module.

The capacitor clip embodies two spring-loaded clamps that enable the device to be secured over the mated BNC connectors on each RX port of a CES E1 (BNC) PAM. Detail B of Figure 2-5 shows how these clips are installed on the module.

Compliance with European certification standards for emission control (EN55022/CISPR22 Class B radiated emission levels) is contingent upon the use of these capacitor clips on the module.

These capacitor clips do not ship with a CES E1 (BNC) PAM. You can order them separately using Cisco part number 800-00327-01.

For 25 Mbps connections, use the special 96-pin Molex to 12-RJ-45 multi-leg cable (Figure 2-6) to connect the switch to the wiring closet patch panel.

Unpacking the System

When receiving a CM or PAM, you will need to read the following instructions.

Step 2 Proceed to the chapter "Installing the LightStream 1010 ATM Switch PAMs" to begin installation.

Repacking the System

In the event that you need to return or move the LightStream 1010 ATM switch, the following instructions describe repacking the switch using the original packaging material:

Step 1 Place the CM or PAM in the antistatic bag.

Step 2 Place the antistatic bag holding the CM or PAM into the shipping container between the foam pads.

Step 3 Seal the container with shipping tape and return it as specified by your Cisco Systems Service representative.

Copyright 1989-1998 © Cisco Systems Inc.