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Lightning Arrestor for the Cisco 1240 Connected Grid Router

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Lightning Arrestor for the Cisco 1240 Connected Grid Router

Table Of Contents

Lightning Arrestor for the Cisco 1240 Connected Grid Router

Introduction

Kit Contents

Accessory Kit

Technical Specifications

Warnings

Installation Considerations

Installing the Lightning Arrestor

To Install the Lightning Arrestor

Suggested Cable

Obtaining Documentation and Submitting a Service Request

Tell Us What You Think


Lightning Arrestor for the Cisco 1240 Connected Grid Router


Last Updated: February 2013
Part Number: OL-26300-02

This document describes the Cisco Lightning Arrestor kit (CGR-LA-NM-NF) for use on the Cisco 1240 Connected Grid Router and provides instructions for mounting.

This document covers the following topics:

Introduction

Kit Contents

Accessory Kit

Technical Specifications

Warnings

Installation Considerations

Installing the Lightning Arrestor

Obtaining Documentation and Submitting a Service Request

Tell Us What You Think

Introduction

The Cisco Lightning Arrestor provides a level of safety protection to the user as well as to wireless equipment by shunting to ground over-voltage transients induced into outdoor antennas and cables. These transients, in mild cases can produce interfering signals in a wireless system, and in extreme cases, can be dangerous and destructive.

Overvoltage transients can be created through lightning static discharges, switch processes, direct contact with power lines, or through earth currents. The Cisco Lightning Arrestor limits the amplitude and duration of disturbing interference voltages and improves the overvoltage resistance of in-line equipment, systems, and components.

The Lightning Arrestor also provides the following benefits:

Broadband operation

DC continuity for outdoor powering

Reversed installation

Permanently installed gas capsule

The lightning arrestor is necessary when installing an external antenna to the Cisco CGR 1240.

Kit Contents

The lightning arrestor kit (CGR-LA-NM-NF) contains the following parts:

Lightning arrestor, nut, and washer

Grounding lug

Accessory Kit

Use the accessory kit (CGR-N-CONN) to convert from an integrated chassis-mounted antenna to an external antenna installation.

This kit contains:

Bulkhead-mounted MCX (female) to N (female) coaxial adapter, quantity of 2

N-type weather cap for temporary installation (if required)

Coaxial cable assembly (LMR-100 or equivalent), RA-QMA(m) to RA-MCX (m), 17.5 inches, quantity of 2

Nylon cable tie wraps, 4 inches, quantity of 2

Technical Specifications

The following are the technical specifications of the Lightning Arrestor:

Table 1 Feature Information for the Lightning Arrestor  

Feature
Description

Arrestor Type

Gas discharge tube

Main path connectors

Port 1: protected, N plug (male)

Port 2: unprotected, N jack (female, bulkhead side)

Impedance

50 ohms

Frequency range

0 MHz to 5800 MHz

Return loss

Greater than or equal to 20 dB

Insertion loss

Less than or equal to 0.2 dB

RF CW power

Less than or equal to 60 W

Surge current handling capability

10 single, multiple kA (test pulse 8/20 ms)

Residual pulse energy

250 microsecond typically (test pulse 4 kV 1.2/50 microsecond; 2kA 8/20 microsecond), main path (protected side)

Operating temperature range

-40-degrees F to 185-degrees F (-40-degrees C to 85-degrees C)

Waterproof rating

IP 67 (according to IEC 60529, data refer to the coupled state)

Mounting and grounding

MH24 (bulkhead)

Material

Housing: brass

Port 1 center contact: gold-plated brass

Port 2 center contract copper beryllium alley


Warnings


Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. Use the statement number provided at the end of each warning to locate its translation in the translated safety warnings that accompanied this device. Statement 1071

SAVE THESE INSTRUCTIONS

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

Warning This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

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

Installation Considerations

We recommend that you bulkhead mount the lightning arrestor onto the router.

The importance of obtaining a good ground and bonding connection cannot be overstressed. Consider these points when grounding the lightning arrestor:

Connect the lightning arrestor components directly to the chassis-mounted bulkhead connector.

The contact points between the bulkhead connector and the lightning arrestor must be clean and free of dust and moisture.

Tighten threaded contacts to the torque specified by the manufacturer.

Installing the Lightning Arrestor

The Cisco Lightning Arrestor must be bulkhead-mounted onto the router chassis. The lightning arrestor must be attached directly onto a well-grounded chassis through the threaded shaft of the lightning arrestor and the bulkhead adapter. See Figure 1.


Note This part might be factory installed in an antenna port on the router when the router is shipped.



Note When you install the lightning arrestor, follow the regulations or best practices applicable to lightning protection installation in your local area.



Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074

Figure 1 Lightning Arrestor Detail

1

Unprotected side N jack (to antenna)

2

Lightning arrestor

3

Protected side N plug (to radio)

4

N-bulkhead port (on host chassis)


To Install the Lightning Arrestor

To install the lightning arrestor:


Step 1 Install the bulkhead N-connector adapter onto the appropriate antenna port on the router chassis. Tighten to a 6-to-7 ft-lbs torque rating.

Step 2 Install the N-plug end of the lightning arrestor onto the top of the bulkhead N-connector). Tighten to a 6-to-7 ft-lbs torque rating.

1

Lightning arrestor

2

N-bulkhead port (on host chassis)


Step 3 Install the N-plug end of your antenna cable onto the N-jack of the lightning arrestor. Tighten to a 6-to-7 ft-lbs torque rating.


Suggested Cable

We recommend using a 20' LMR-400 N(m)-N(m) low-loss coaxial cable (part numbers CAB-L400-20-N-N) or a 30' LMR-600N (m)-N(m) very low-loss coaxial cable (CAB-L600-30-N-N).

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information, see What's New in Cisco Product Documentation at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html.

Subscribe to What's New in Cisco Product Documentation, which lists all new and revised Cisco technical documentation, as an RSS feed and deliver content directly to your desktop using a reader application. The RSS feeds are a free service.

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