2-16
Cisco IR800 Integrated Services Router Software Configuration Guide
Chapter 2 Product Overview
Antenna Recommendations
Antenna Recommendations
Neither the IR809 or IR829 are shipped with antennas. They must be ordered separately. The IR829
must be installed with 2 antennas (Main & Aux) to guarantee the best performance level. Using a single
antenna may impact the downlink performance by a minimum 3dB, and can be much greater (10-20dB)
due to multipath fading (destructive interference between direct and reflected radio waves).
In case of 3G UMTS, a solo antenna would not be able to switch to the diversity port.
With the IR829, it must be guaranteed >15dB isolation between the WiFi and LTE antennas at all
frequencies of 4G LTE and WiFi operation, for minimum impact to performance. This is ideally
20-25dB.
The Sierra Wireless MC73xx modem series supports MIMO on LTE. WCDMA UMTS HSPA
DC-HSPA+ is diversity only, without MIMO.
Note
Poorly installed MIMO antennas, such that the two (or more in case of 3x3, 4x4 MIMO) antennas have
a strong correlation coefficient. This may cause the two streams to interfere with each other (otherwise
known as lack of diversity), since the system has trouble separating the two. The multi-element antennas
(5-in-1, 3-in-1, 2-in-1) have good diversity
For detailed information about Cisco Antennas, please refer to the following guides:
Cisco Industrial Routers Antenna Guide:
http://www.cisco.com/c/en/us/td/docs/routers/connectedgrid/antennas/installing-combined/industrial-r
outers-antenna-guide.html
Connected Grid Antennas Installation Guide:
http://www.cisco.com/c/en/us/td/docs/routers/connectedgrid/antennas/installing/cg_antenna_install_gu
ide.html
Cisco Aironet Antennas and Accessories Reference Guide
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-antennas-accessories/product_data_
sheet09186a008008883b.html
Features Supported in Different IOS Releases
The IR800 series was originally released with IOS software version 15.5(3)M. The following lists the
software releases with the features added.
15.5(3)M (initial release)
•
Software based Crypto
15.5(3)M
x
•
Hardware based Crypto
15.6(1)T
•
IR809 Input alarm port, including SNMP Trap support
•
SLIP & PPP serial encapsulation on serial interfaces
•
Reset button behavior changed to match other 800 series
