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Antenna Guide for ISR and CGR with Verizon Wireless 4G LTE
Introduction
LTE offers a valuable last mile access option for remote locations, kiosks, temporary sites, vehicle communications
and machine-to-machine applications. Benefits of 4G wireless access include reach, mobility, cost (depends on usage
and plan) and performance. This document is focused on Cisco ISR LTE performance based on signal quality due to
antenna type and placement. The information is appropriate for Cisco 1900, 2900, 3900 with EHWIC-4G-LTE-V,
C819G-4G-V, and CGR2010 with GRWIC-4G-LTE-V. This document is organized in the following fashion:
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Very brief guidelines for antenna selection and placement
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General guidelines for antenna selection, placement and installation
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Detailed guidelines for antenna selection, placement, installation, and confirmation
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Sample configuration for retrieving LTE status, radio signal and ping results via text message
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Frequently Asked Questions
Very Brief Guidelines for Antenna Selection and Placement
1. All platforms ship with quantity 2 4G-LTE-ANTM-D indoor dipole antennas. Always connect both antennas.
2. Antennas should always be placed more than 17” apart. The only way to do this is to use an antenna cable with
at least one of the antennas. At least one 10’ cable with base (4G-AE010-R) ships with every Cisco LTE device.
(C819G-4G-V units shipped before October 2013 may not include a cable; one can be purchased separately)
3. If after confirming a correct software image, software configuration, a properly enabled SIM, and connected
antennas, there is no LTE connection or low performance, review the general guidelines that follow. For software
image and configuration recommendations, see the Verizon LTE deployment guides at
www.cisco.com/en/US/products/ps5949/products_installation_and_configuration_guides_list.html
4. Use of a separate “bridge” LTE device added to an ISR (instead of an ISR LTE interface with good antenna
placement) is not recommended. LTE bridges connect to an ISR via Ethernet and have these characteristics:
a. Allow the use of inexpensive unshielded twisted pair cabling instead of a low loss antenna cable
b. Negatively affect the ability of the ISR to know the actual status of LTE WAN connection
c. Impair remote site management (visibility into the LTE specifics: RSSI, RSRP, RSRQ, SINR)
d. Impair troubleshooting (no remote DM Logging, no output detail from IOS LTE modem status)
e. Disallow LTE modem tuning and control from the ISR (e.g. no automation of those functions)
ISRs have indoor and outdoor antenna options/SKUs that allow the antenna to be placed up to 75 feet away,
while still providing the advantages of a single integrated solution.
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