What Ceragon MHS provides Chapter 12
FA4800 User Manual Release 1.9.40 12-2
Ceragon MHS provides redundancy and backup to TDM services. It is designed to provide
high reliability high-capacity Point-to-Point links. The Ceragon MHS is -
• 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 equipment 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 completely 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 elements, ODU and IDU.
The primary IDU and the secondary IDU are connected by a cable to monitor 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 secondary link.
In addition, improved robustness and frequency planning flexibility is achieved, as the pri-
mary and secondary air interfaces can operate in the same frequency band or in different fre-
quency bands.
Automatic Channel Selection (ACS) can be configured for each link to add additional robust-
ness.
The primary and secondary links are synchronized using Hub Site Synchronization (HSS).
It is recommended that both sites be installed with HSS cables. If HSS fails at one site, it can
be operated from the other site by remote configuration.
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