Table Of Contents
Lightning Arrestor for the Cisco 1240 Connected Grid Router
Last Updated: February 2013Part 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:
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:
•DC continuity for outdoor powering
•Permanently installed gas capsule
The lightning arrestor is necessary when installing an external antenna to the Cisco CGR 1240.
The lightning arrestor kit (CGR-LA-NM-NF) contains the following parts:
•Lightning arrestor, nut, and washer
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
The following are the technical specifications of the Lightning Arrestor:
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030
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
Unprotected side N jack (to antenna)
Protected side N plug (to radio)
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.
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.
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.
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