What RADWIN MHS provides Chapter 12RADWIN 2000 User Manual Release 2.6.50 12-2RADWIN MHS provides redundancy and backup to TDM services. It is designed to providehigh reliability high-capacity Point-to-Point links. The RADWIN 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 lossof air interface, by simple connectivity between a primary link and a secondary linkThe main service redundancy features of the RADWIN 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 RADWIN 2000 and four TDM channels forWinLink 1000.MHS is supported between -• two WinLink 1000 links• two RADWIN 2000 links• a WinLink 1000 link and a RADWIN 2000 link.What RADWIN MHS providesEquipment ProtectionEquipment 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 tocontrol protection switching. Switching time is less than 50ms.When connecting two WinLink 1000 links as 1+1, one dual-polarization antenna can beshared by the primary link and the secondary link.Air-Interface ProtectionAir-Interface protection is unique to RADWIN and is optimized for wireless links operating inlicense-free bands.The primary link and the secondary link use different frequency channels. If the air-interfaceof the primary link is disturbed and cannot carry the required TDM service, then the systemautomatically 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 canbe operated from the other site by remote configuration.
