User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 495 of 825
Ceragon Proprietary and Confidential
14.8
Configuring MIMO and Space Diversity (CLI)
Note
:
This feature is only relevant for IP-20C and IP-20C-HP.
This section describes how to configure MIMO and Space Diversity, and includes
the following topics:
•
MIMO and Space Diversity Overview (CLI)
•
Upgrading a 4x4 MIMO Link from an Earlier Version to CeraOS 10.5 or Higher
(CLI)
•
Configuring a 4x4 MIMO Link (CLI
•
Configuring a 2x2 MIMO Link (CLI)
•
Configuring a 1+0 or 2+2 Space Diversity Link (CLI)
•
•
Deleting a 4x4 MIMO Group (CLI)
•
Deleting a 2x2 MIMO or Space Diversity Group (CLI)
14.8.1
MIMO and Space Diversity Overview (CLI)
Line-of-Sight (LoS) Multiple Input Multiple Output (MIMO) achieves spatial
multiplexing by creating an artificial phase de-correlation by deliberate antenna
distance at each site in deterministic constant distance. At each site in an LoS
MIMO configuration, data to be transmitted over the radio link is split into two bit
streams (MIMO 2x2) or four bit streams (MIMO 4x4). These bit streams are
transmitted via two antennas. In MIMO 2x2, the antennas use a single
polarization. In MIMO 4x4, each antenna uses dual polarization. The phase
difference caused by the antenna separation enables the receiver to distinguish
between the streams.
IP-20C supports both MIMO 2x2 and MIMO 4x4. For a full explanation of MIMO
support in IP-20C, refer to the IP-20C Technical Description.
For 4x4 MIMO using an external switch operating in LAG mode, Mate
Management Access enables users to manage both units via in-band
management. See
Mate Management Access (IP Forwarding) (CLI)
The same hardware configurations can also be used to implement BBS Space
Diversity. IP-20C and IP-20C-HP support 1+0 and 2+2 Space Diversity. For a full
explanation of Space Diversity support in IP-20C and IP-20C-HP, refer to the
Technical Description for the product and CeraOS version you are using.
2+2 HSB Space Diversity provides both equipment protection and signal
protection. If one unit goes out of service, the other unit takes over and maintains
the link until the other unit is restored to service and Space Diversity operation
resumes.
2+2 HSB Space Diversity utilizes two IP-20C units operating in dual core mode. In
each IP-20C unit, both radio carriers are connected to a single antenna. One
optical GbE port on each IP-20C is connected to an optical splitter. Traffic must be
routed to an optical GbE port on each IP-20C unit.