What Ceragon MHS provides
Chapter 12
FA4800 User Manual
Release 1.9.30
12-2
• Designed to provide redundancy and high reliability for carrier class
operators
• Optimized for high capacity links operating in license-free bands
• A comprehensive solution providing protection against both equip-
ment failure and loss of air interface, by simple connectivity between
a primary link and a secondary link
The main service redundancy features of the Ceragon MHS are –
• TDM service cut-over from the primary to the secondary link is com-
pletely automatic
• TDM service cut-over time no more than 50 ms
• Automatic restore to primary link as soon as it becomes available
• Support for up to sixteen TDM channels for FibeAir 2000 and four
TDM channels for FA4800.
MHS is supported between -
• two FA4800 links
• two FibeAir 2000 links
• a FA4800 link and a FibeAir 2000 link.
What Ceragon MHS provides
Equipment Protection
Equipment protection is provided for the electrically-active network ele-
ments, ODU and IDU.
The primary IDU and the secondary IDU are connected by a cable to moni-
tor failure and to control protection switching. Switching time is less than
50ms.
When connecting two FA4800 links as 1+1, one dual-polarization antenna
can be shared by the primary link and the secondary link.
Air-Interface Protection
Air-Interface protection is unique to Ceragon and is optimized for wireless
links operating in license-free bands.
The primary link and the secondary link use different frequency channels. If
the air-interface of the primary link is disturbed and cannot carry the
required TDM service, then the system automatically switches to the secon-
dary link.
In addition, improved robustness and frequency planning flexibility is
achieved, as the primary and secondary air interfaces can operate in the
same frequency band or in different frequency bands.
Automatic Channel Selection (ACS) can be configured for each link to add
additional robustness.
